k-9/src/com/fsck/k9/fragment/MessageListFragment.java

package com.fsck.k9.fragment;

import java.text.DateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.EnumMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Future;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.graphics.Color;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.CursorAdapter;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.style.AbsoluteSizeSpan;
import android.text.style.ForegroundColorSpan;
import android.util.Log;
import android.util.SparseBooleanArray;
import android.util.TypedValue;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.actionbarsherlock.app.SherlockFragment;
import com.actionbarsherlock.view.ActionMode;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;
import com.actionbarsherlock.view.Window;
import com.fsck.k9.Account;
import com.fsck.k9.Account.SortType;
import com.fsck.k9.AccountStats;
import com.fsck.k9.FontSizes;
import com.fsck.k9.K9;
import com.fsck.k9.Preferences;
import com.fsck.k9.R;
import com.fsck.k9.activity.ActivityListener;
import com.fsck.k9.activity.ChooseFolder;
import com.fsck.k9.activity.FolderInfoHolder;
import com.fsck.k9.activity.MessageReference;
import com.fsck.k9.controller.MessagingController;
import com.fsck.k9.fragment.ConfirmationDialogFragment;
import com.fsck.k9.fragment.ConfirmationDialogFragment.ConfirmationDialogFragmentListener;
import com.fsck.k9.helper.MessageHelper;
import com.fsck.k9.helper.MergeCursorWithUniqueId;
import com.fsck.k9.helper.StringUtils;
import com.fsck.k9.helper.Utility;
import com.fsck.k9.mail.Address;
import com.fsck.k9.mail.Flag;
import com.fsck.k9.mail.Folder;
import com.fsck.k9.mail.Message;
import com.fsck.k9.mail.MessagingException;
import com.fsck.k9.mail.Folder.OpenMode;
import com.fsck.k9.mail.store.LocalStore;
import com.fsck.k9.mail.store.LocalStore.LocalFolder;
import com.fsck.k9.provider.EmailProvider;
import com.fsck.k9.provider.EmailProvider.MessageColumns;
import com.fsck.k9.provider.EmailProvider.SpecialColumns;
import com.fsck.k9.search.LocalSearch;
import com.fsck.k9.search.SearchSpecification;
import com.fsck.k9.search.SqlQueryBuilder;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;


public class MessageListFragment extends SherlockFragment implements OnItemClickListener,
        ConfirmationDialogFragmentListener, LoaderCallbacks<Cursor> {

    private static final String[] THREADED_PROJECTION = {
        MessageColumns.ID,
        MessageColumns.UID,
        MessageColumns.INTERNAL_DATE,
        MessageColumns.SUBJECT,
        MessageColumns.DATE,
        MessageColumns.SENDER_LIST,
        MessageColumns.TO_LIST,
        MessageColumns.CC_LIST,
        MessageColumns.FLAGS,
        MessageColumns.ATTACHMENT_COUNT,
        MessageColumns.FOLDER_ID,
        MessageColumns.PREVIEW,
        MessageColumns.THREAD_ROOT,
        MessageColumns.THREAD_PARENT,
        SpecialColumns.ACCOUNT_UUID,
        SpecialColumns.FOLDER_NAME,

        MessageColumns.THREAD_COUNT,
    };

    private static final int ID_COLUMN = 0;
    private static final int UID_COLUMN = 1;
    private static final int INTERNAL_DATE_COLUMN = 2;
    private static final int SUBJECT_COLUMN = 3;
    private static final int DATE_COLUMN = 4;
    private static final int SENDER_LIST_COLUMN = 5;
    private static final int TO_LIST_COLUMN = 6;
    private static final int CC_LIST_COLUMN = 7;
    private static final int FLAGS_COLUMN = 8;
    private static final int ATTACHMENT_COUNT_COLUMN = 9;
    private static final int FOLDER_ID_COLUMN = 10;
    private static final int PREVIEW_COLUMN = 11;
    private static final int THREAD_ROOT_COLUMN = 12;
    private static final int THREAD_PARENT_COLUMN = 13;
    private static final int ACCOUNT_UUID_COLUMN = 14;
    private static final int FOLDER_NAME_COLUMN = 15;
    private static final int THREAD_COUNT_COLUMN = 16;

    private static final String[] PROJECTION = Utility.copyOf(THREADED_PROJECTION,
            THREAD_COUNT_COLUMN);


    public static MessageListFragment newInstance(LocalSearch search, boolean threadedList,
            boolean remoteSearch) {
        MessageListFragment fragment = new MessageListFragment();
        Bundle args = new Bundle();
        args.putParcelable(ARG_SEARCH, search);
        args.putBoolean(ARG_THREADED_LIST, threadedList);
        args.putBoolean(ARG_REMOTE_SEARCH, remoteSearch);
        fragment.setArguments(args);
        return fragment;
    }

    /**
     * Reverses the result of a {@link Comparator}.
     *
     * @param <T>
     */
    public static class ReverseComparator<T> implements Comparator<T> {
        private Comparator<T> mDelegate;

        /**
         * @param delegate
         *            Never <code>null</code>.
         */
        public ReverseComparator(final Comparator<T> delegate) {
            mDelegate = delegate;
        }

        @Override
        public int compare(final T object1, final T object2) {
            // arg1 & 2 are mixed up, this is done on purpose
            return mDelegate.compare(object2, object1);
        }
    }

    /**
     * Chains comparator to find a non-0 result.
     *
     * @param <T>
     */
    public static class ComparatorChain<T> implements Comparator<T> {
        private List<Comparator<T>> mChain;

        /**
         * @param chain
         *            Comparator chain. Never <code>null</code>.
         */
        public ComparatorChain(final List<Comparator<T>> chain) {
            mChain = chain;
        }

        @Override
        public int compare(T object1, T object2) {
            int result = 0;
            for (final Comparator<T> comparator : mChain) {
                result = comparator.compare(object1, object2);
                if (result != 0) {
                    break;
                }
            }
            return result;
        }
    }

    public static class ReverseIdComparator implements Comparator<Cursor> {
        private int mIdColumn = -1;

        @Override
        public int compare(Cursor cursor1, Cursor cursor2) {
            if (mIdColumn == -1) {
                mIdColumn = cursor1.getColumnIndex("_id");
            }
            long o1Id = cursor1.getLong(mIdColumn);
            long o2Id = cursor2.getLong(mIdColumn);
            return (o1Id > o2Id) ? -1 : 1;
        }
    }

    public static class AttachmentComparator implements Comparator<Cursor> {

        @Override
        public int compare(Cursor cursor1, Cursor cursor2) {
            int o1HasAttachment = (cursor1.getInt(ATTACHMENT_COUNT_COLUMN) > 0) ? 0 : 1;
            int o2HasAttachment = (cursor2.getInt(ATTACHMENT_COUNT_COLUMN) > 0) ? 0 : 1;
            return o1HasAttachment - o2HasAttachment;
        }
    }

    public static class FlaggedComparator implements Comparator<Cursor> {

        @Override
        public int compare(Cursor cursor1, Cursor cursor2) {
            int o1IsFlagged = (cursor1.getString(FLAGS_COLUMN).contains("FLAGGED")) ? 0 : 1;
            int o2IsFlagged = (cursor2.getString(FLAGS_COLUMN).contains("FLAGGED")) ? 0 : 1;
            return o1IsFlagged - o2IsFlagged;
        }
    }

    public static class UnreadComparator implements Comparator<Cursor> {

        @Override
        public int compare(Cursor cursor1, Cursor cursor2) {
            int o1IsUnread = (cursor1.getString(FLAGS_COLUMN).contains("SEEN")) ? 1 : 0;
            int o2IsUnread = (cursor2.getString(FLAGS_COLUMN).contains("SEEN")) ? 1 : 0;
            return o1IsUnread - o2IsUnread;
        }
    }

    public static class DateComparator implements Comparator<Cursor> {

        @Override
        public int compare(Cursor cursor1, Cursor cursor2) {
            long o1Date = cursor1.getLong(DATE_COLUMN);
            long o2Date = cursor2.getLong(DATE_COLUMN);
            if (o1Date < o2Date) {
                return -1;
            } else if (o1Date == o2Date) {
                return 0;
            } else {
                return 1;
            }
        }
    }

    public static class ArrivalComparator implements Comparator<Cursor> {

        @Override
        public int compare(Cursor cursor1, Cursor cursor2) {
            long o1Date = cursor1.getLong(INTERNAL_DATE_COLUMN);
            long o2Date = cursor2.getLong(INTERNAL_DATE_COLUMN);
            if (o1Date == o2Date) {
                return 0;
            } else if (o1Date < o2Date) {
                return -1;
            } else {
                return 1;
            }
        }
    }

    public static class SubjectComparator implements Comparator<Cursor> {

        @Override
        public int compare(Cursor cursor1, Cursor cursor2) {
            String subject1 = cursor1.getString(SUBJECT_COLUMN);
            String subject2 = cursor2.getString(SUBJECT_COLUMN);

            return subject1.compareToIgnoreCase(subject2);
        }
    }


    private static final int ACTIVITY_CHOOSE_FOLDER_MOVE = 1;
    private static final int ACTIVITY_CHOOSE_FOLDER_COPY = 2;

    private static final String ARG_SEARCH = "searchObject";
    private static final String ARG_THREADED_LIST = "threadedList";
    private static final String ARG_REMOTE_SEARCH = "remoteSearch";
    private static final String STATE_LIST_POSITION = "listPosition";

    /**
     * Maps a {@link SortType} to a {@link Comparator} implementation.
     */
    private static final Map<SortType, Comparator<Cursor>> SORT_COMPARATORS;

    static {
        // fill the mapping at class time loading

        final Map<SortType, Comparator<Cursor>> map =
                new EnumMap<SortType, Comparator<Cursor>>(SortType.class);
        map.put(SortType.SORT_ATTACHMENT, new AttachmentComparator());
        map.put(SortType.SORT_DATE, new DateComparator());
        map.put(SortType.SORT_ARRIVAL, new ArrivalComparator());
        map.put(SortType.SORT_FLAGGED, new FlaggedComparator());
        map.put(SortType.SORT_SUBJECT, new SubjectComparator());
        map.put(SortType.SORT_UNREAD, new UnreadComparator());

        // make it immutable to prevent accidental alteration (content is immutable already)
        SORT_COMPARATORS = Collections.unmodifiableMap(map);
    }

    private ListView mListView;
    private PullToRefreshListView mPullToRefreshView;

    private int mPreviewLines = 0;


    private MessageListAdapter mAdapter;
    private View mFooterView;

    private FolderInfoHolder mCurrentFolder;

    private LayoutInflater mInflater;

    private MessagingController mController;

    private Account mAccount;
    private String[] mAccountUuids;
    private int mUnreadMessageCount = 0;

    private Cursor[] mCursors;

    /**
     * Stores the name of the folder that we want to open as soon as possible
     * after load.
     */
    private String mFolderName;

    /**
     * If we're doing a search, this contains the query string.
     */
    private boolean mRemoteSearch = false;
    private Future mRemoteSearchFuture = null;

    private String mTitle;
    private LocalSearch mSearch = null;
    private boolean mSingleAccountMode;
    private boolean mSingleFolderMode;

    private MessageListHandler mHandler = new MessageListHandler();

    private SortType mSortType = SortType.SORT_DATE;
    private boolean mSortAscending = true;
    private boolean mSortDateAscending = false;
    private boolean mSenderAboveSubject = false;

    private int mSelectedCount = 0;
    private SparseBooleanArray mSelected;

    private FontSizes mFontSizes = K9.getFontSizes();

    private MenuItem mRefreshMenuItem;
    private ActionMode mActionMode;
    private View mActionBarProgressView;
    private Bundle mState = null;

    private Boolean mHasConnectivity;

    /**
     * Relevant messages for the current context when we have to remember the
     * chosen messages between user interactions (eg. Selecting a folder for
     * move operation)
     */
    private Message[] mActiveMessages;

    /* package visibility for faster inner class access */
    MessageHelper mMessageHelper;

    private ActionModeCallback mActionModeCallback = new ActionModeCallback();


    private MessageListFragmentListener mFragmentListener;


    private DateFormat mTimeFormat;

    private boolean mThreadedList;


    private Context mContext;

    private final ActivityListener mListener = new MessageListActivityListener();

    private Preferences mPreferences;

    /**
     * This class is used to run operations that modify UI elements in the UI thread.
     *
     * <p>We are using convenience methods that add a {@link android.os.Message} instance or a
     * {@link Runnable} to the message queue.</p>
     *
     * <p><strong>Note:</strong> If you add a method to this class make sure you don't accidentally
     * perform the operation in the calling thread.</p>
     */
    class MessageListHandler extends Handler {
        private static final int ACTION_FOLDER_LOADING = 1;
        private static final int ACTION_REFRESH_TITLE = 2;
        private static final int ACTION_PROGRESS = 3;


        public void folderLoading(String folder, boolean loading) {
            android.os.Message msg = android.os.Message.obtain(this, ACTION_FOLDER_LOADING,
                    (loading) ? 1 : 0, 0, folder);
            sendMessage(msg);
        }

        public void refreshTitle() {
            android.os.Message msg = android.os.Message.obtain(this, ACTION_REFRESH_TITLE);
            sendMessage(msg);
        }

        public void progress(final boolean progress) {
            android.os.Message msg = android.os.Message.obtain(this, ACTION_PROGRESS,
                    (progress) ? 1 : 0, 0);
            sendMessage(msg);
        }

        public void updateFooter(final String message, final boolean showProgress) {
            //TODO: use message
            post(new Runnable() {
                @Override
                public void run() {
                    updateFooter(message, showProgress);
                }
            });
        }

        @Override
        public void handleMessage(android.os.Message msg) {
            switch (msg.what) {
                case ACTION_FOLDER_LOADING: {
                    String folder = (String) msg.obj;
                    boolean loading = (msg.arg1 == 1);
                    MessageListFragment.this.folderLoading(folder, loading);
                    break;
                }
                case ACTION_REFRESH_TITLE: {
                    MessageListFragment.this.refreshTitle();
                    break;
                }
                case ACTION_PROGRESS: {
                    boolean progress = (msg.arg1 == 1);
                    MessageListFragment.this.progress(progress);
                    break;
                }
            }
        }
    }

    /**
     * @return The comparator to use to display messages in an ordered
     *         fashion. Never <code>null</code>.
     */
    protected Comparator<Cursor> getComparator() {
        final List<Comparator<Cursor>> chain =
                new ArrayList<Comparator<Cursor>>(3 /* we add 3 comparators at most */);

        // Add the specified comparator
        final Comparator<Cursor> comparator = SORT_COMPARATORS.get(mSortType);
        if (mSortAscending) {
            chain.add(comparator);
        } else {
            chain.add(new ReverseComparator<Cursor>(comparator));
        }

        // Add the date comparator if not already specified
        if (mSortType != SortType.SORT_DATE && mSortType != SortType.SORT_ARRIVAL) {
            final Comparator<Cursor> dateComparator = SORT_COMPARATORS.get(SortType.SORT_DATE);
            if (mSortDateAscending) {
                chain.add(dateComparator);
            } else {
                chain.add(new ReverseComparator<Cursor>(dateComparator));
            }
        }

        // Add the id comparator
        chain.add(new ReverseIdComparator());

        // Build the comparator chain
        return new ComparatorChain<Cursor>(chain);
    }

    private void folderLoading(String folder, boolean loading) {
        if (mCurrentFolder != null && mCurrentFolder.name.equals(folder)) {
            mCurrentFolder.loading = loading;
        }
        updateFooterView();
    }

    private void refreshTitle() {
        setWindowTitle();
        if (!mRemoteSearch) {
            setWindowProgress();
        }
    }

    private void setWindowProgress() {
        int level = Window.PROGRESS_END;

        if (mCurrentFolder != null && mCurrentFolder.loading && mListener.getFolderTotal() > 0) {
            int divisor = mListener.getFolderTotal();
            if (divisor != 0) {
                level = (Window.PROGRESS_END / divisor) * (mListener.getFolderCompleted()) ;
                if (level > Window.PROGRESS_END) {
                    level = Window.PROGRESS_END;
                }
            }
        }

        mFragmentListener.setMessageListProgress(level);
    }

    private void setWindowTitle() {
        // regular folder content display
        if (mSingleFolderMode) {
            Activity activity = getActivity();
            String displayName = FolderInfoHolder.getDisplayName(activity, mAccount,
                mFolderName);

            mFragmentListener.setMessageListTitle(displayName);

            String operation = mListener.getOperation(activity, getTimeFormat()).trim();
            if (operation.length() < 1) {
                mFragmentListener.setMessageListSubTitle(mAccount.getEmail());
            } else {
                mFragmentListener.setMessageListSubTitle(operation);
            }
        } else {
            // query result display.  This may be for a search folder as opposed to a user-initiated search.
            if (mTitle != null) {
                // This was a search folder; the search folder has overridden our title.
                mFragmentListener.setMessageListTitle(mTitle);
            } else {
                // This is a search result; set it to the default search result line.
                mFragmentListener.setMessageListTitle(getString(R.string.search_results));
            }

            mFragmentListener.setMessageListSubTitle(null);
        }

        // set unread count
        if (mUnreadMessageCount == 0) {
            mFragmentListener.setUnreadCount(0);
        } else {
            if (!mSingleFolderMode && mTitle == null) {
                // The unread message count is easily confused
                // with total number of messages in the search result, so let's hide it.
                mFragmentListener.setUnreadCount(0);
            } else {
                mFragmentListener.setUnreadCount(mUnreadMessageCount);
            }
        }
    }

    private void setupFormats() {
        mTimeFormat = android.text.format.DateFormat.getTimeFormat(mContext);
    }

    private DateFormat getTimeFormat() {
        return mTimeFormat;
    }

    private void progress(final boolean progress) {
        // Make sure we don't try this before the menu is initialized
        // this could happen while the activity is initialized.
        if (mRefreshMenuItem != null) {
            if (progress) {
                mRefreshMenuItem.setActionView(mActionBarProgressView);
            } else {
                mRefreshMenuItem.setActionView(null);
            }
        }

        if (mPullToRefreshView != null && !progress) {
            mPullToRefreshView.onRefreshComplete();
        }
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        if (view == mFooterView) {
            if (mCurrentFolder != null && !mRemoteSearch) {
                mController.loadMoreMessages(mAccount, mFolderName, null);
            } /*else if (mRemoteSearch && mAdapter.mExtraSearchResults != null && mAdapter.mExtraSearchResults.size() > 0 && mSearchAccount != null) {
                int numResults = mAdapter.mExtraSearchResults.size();
                Context appContext = getActivity().getApplicationContext();
                Account account = Preferences.getPreferences(appContext).getAccount(mSearchAccount);
                if (account == null) {
                    updateFooter("", false);
                    return;
                }
                int limit = mAccount.getRemoteSearchNumResults();
                List<Message> toProcess = mAdapter.mExtraSearchResults;
                if (limit > 0 && numResults > limit) {
                    toProcess = toProcess.subList(0, limit);
                    mAdapter.mExtraSearchResults = mAdapter.mExtraSearchResults.subList(limit, mAdapter.mExtraSearchResults.size());
                } else {
                    mAdapter.mExtraSearchResults = null;
                    updateFooter("", false);
                }
                mController.loadSearchResults(mAccount, mCurrentFolder.name, toProcess, mListener);
            }*/
            return;
        }

        Cursor cursor = (Cursor) parent.getItemAtPosition(position);
        if (mSelectedCount > 0) {
            toggleMessageSelect(position);
        } else {
            Account account = getAccountFromCursor(cursor);

            long folderId = cursor.getLong(FOLDER_ID_COLUMN);
            String folderName = getFolderNameById(account, folderId);

            if (mThreadedList && cursor.getInt(THREAD_COUNT_COLUMN) > 1) {
                long rootId = cursor.getLong(THREAD_ROOT_COLUMN);
                mFragmentListener.showThread(account, folderName, rootId);
            } else {
                MessageReference ref = new MessageReference();
                ref.accountUuid = account.getUuid();
                ref.folderName = folderName;
                ref.uid = cursor.getString(UID_COLUMN);
                onOpenMessage(ref);
            }
        }
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        mContext = activity.getApplicationContext();

        try {
            mFragmentListener = (MessageListFragmentListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.getClass() +
                    " must implement MessageListFragmentListener");
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mPreferences = Preferences.getPreferences(getActivity().getApplicationContext());
        mController = MessagingController.getInstance(getActivity().getApplication());

        mPreviewLines = K9.messageListPreviewLines();

        decodeArguments();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        mInflater = inflater;

        View view = inflater.inflate(R.layout.message_list_fragment, container, false);

        mActionBarProgressView = inflater.inflate(R.layout.actionbar_indeterminate_progress_actionview, null);

        mPullToRefreshView = (PullToRefreshListView) view.findViewById(R.id.message_list);

        initializeLayout();
        mListView.setVerticalFadingEdgeEnabled(false);

        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        mMessageHelper = MessageHelper.getInstance(getActivity());

        initializeMessageList();

        // This needs to be done before initializing the cursor loader below
        initializeSortSettings();

        LoaderManager loaderManager = getLoaderManager();
        int len = mAccountUuids.length;
        mCursors = new Cursor[len];
        for (int i = 0; i < len; i++) {
            loaderManager.initLoader(i, null, this);
        }
    }

    private void initializeSortSettings() {
        if (mSingleAccountMode) {
            mSortType = mAccount.getSortType();
            mSortAscending = mAccount.isSortAscending(mSortType);
            mSortDateAscending = mAccount.isSortAscending(SortType.SORT_DATE);
        } else {
            mSortType = K9.getSortType();
            mSortAscending = K9.isSortAscending(mSortType);
            mSortDateAscending = K9.isSortAscending(SortType.SORT_DATE);
        }
    }

    private void decodeArguments() {
        Bundle args = getArguments();

        mThreadedList = args.getBoolean(ARG_THREADED_LIST, false);
        mRemoteSearch = args.getBoolean(ARG_REMOTE_SEARCH, false);
        mSearch = args.getParcelable(ARG_SEARCH);
        mTitle = mSearch.getName();

        String[] accountUuids = mSearch.getAccountUuids();

        mSingleAccountMode = false;
        if (accountUuids.length == 1 && !mSearch.searchAllAccounts()) {
            mSingleAccountMode = true;
            mAccount = mPreferences.getAccount(accountUuids[0]);
        }

        mSingleFolderMode = false;
        if (mSingleAccountMode && (mSearch.getFolderNames().size() == 1)) {
            mSingleFolderMode = true;
            mFolderName = mSearch.getFolderNames().get(0);
            mCurrentFolder = getFolder(mFolderName, mAccount);
        }

        if (mSingleAccountMode) {
            mAccountUuids = new String[] { mAccount.getUuid() };
        } else {
            if (accountUuids.length == 1 &&
                    accountUuids[0].equals(SearchSpecification.ALL_ACCOUNTS)) {

                Account[] accounts = mPreferences.getAccounts();

                mAccountUuids = new String[accounts.length];
                for (int i = 0, len = accounts.length; i < len; i++) {
                    mAccountUuids[i] = accounts[i].getUuid();
                }
            } else {
                mAccountUuids = accountUuids;
            }
        }
    }

    private void initializeMessageList() {
        mAdapter = new MessageListAdapter();

        if (mFolderName != null) {
            mCurrentFolder = getFolder(mFolderName, mAccount);
        }

        if (mSingleFolderMode) {
            mListView.addFooterView(getFooterView(mListView));
            updateFooterView();
        }

        mController = MessagingController.getInstance(getActivity().getApplication());
        mListView.setAdapter(mAdapter);
    }

    private FolderInfoHolder getFolder(String folder, Account account) {
        LocalFolder local_folder = null;
        try {
            LocalStore localStore = account.getLocalStore();
            local_folder = localStore.getFolder(folder);
            return new FolderInfoHolder(mContext, local_folder, account);
        } catch (Exception e) {
            Log.e(K9.LOG_TAG, "getFolder(" + folder + ") goes boom: ", e);
            return null;
        } finally {
            if (local_folder != null) {
                local_folder.close();
            }
        }
    }

    private String getFolderNameById(Account account, long folderId) {
        try {
            Folder folder = getFolderById(account, folderId);
            if (folder != null) {
                return folder.getName();
            }
        } catch (Exception e) {
            Log.e(K9.LOG_TAG, "getFolderNameById() failed.", e);
        }

        return null;
    }

    private Folder getFolderById(Account account, long folderId) {
        try {
            LocalStore localStore = account.getLocalStore();
            LocalFolder localFolder = localStore.getFolderById(folderId);
            localFolder.open(OpenMode.READ_ONLY);
            return localFolder;
        } catch (Exception e) {
            Log.e(K9.LOG_TAG, "getFolderNameById() failed.", e);
            return null;
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        mController.removeListener(mListener);
        saveListState();
    }

    public void saveListState() {
        mState = new Bundle();
        mState.putInt(STATE_LIST_POSITION, mListView.getSelectedItemPosition());
    }

    public void restoreListState() {
        if (mState == null) {
            return;
        }

        int pos = mState.getInt(STATE_LIST_POSITION, ListView.INVALID_POSITION);

        if (pos >= mListView.getCount()) {
            pos = mListView.getCount() - 1;
        }

        if (pos == ListView.INVALID_POSITION) {
            mListView.setSelected(false);
        } else {
            mListView.setSelection(pos);
        }
    }

    /**
     * On resume we refresh messages for the folder that is currently open.
     * This guarantees that things like unread message count and read status
     * are updated.
     */
    @Override
    public void onResume() {
        super.onResume();

        setupFormats();

        Context appContext = getActivity().getApplicationContext();

        mSenderAboveSubject = K9.messageListSenderAboveSubject();

        // Check if we have connectivity.  Cache the value.
        if (mHasConnectivity == null) {
            final ConnectivityManager connectivityManager =
                (ConnectivityManager) getActivity().getApplication().getSystemService(
                        Context.CONNECTIVITY_SERVICE);
            final NetworkInfo netInfo = connectivityManager.getActiveNetworkInfo();
            if (netInfo != null && netInfo.getState() == NetworkInfo.State.CONNECTED) {
                mHasConnectivity = true;
            } else {
                mHasConnectivity = false;
            }
        }

        if (mSingleFolderMode) {
            if (mRemoteSearch && mAccount.allowRemoteSearch()) {
                mPullToRefreshView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener<ListView>() {
                    @Override
                    public void onRefresh(PullToRefreshBase<ListView> refreshView) {
                        mPullToRefreshView.onRefreshComplete();
                        onRemoteSearchRequested();
                    }
                });
                mPullToRefreshView.setPullLabel(getString(R.string.pull_to_refresh_remote_search_from_local_search_pull));
                mPullToRefreshView.setReleaseLabel(getString(R.string.pull_to_refresh_remote_search_from_local_search_release));
            } else {
                mPullToRefreshView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener<ListView>() {
                    @Override
                    public void onRefresh(PullToRefreshBase<ListView> refreshView) {
                        checkMail();
                    }
                });
            }
        } else {
            mPullToRefreshView.setMode(PullToRefreshBase.Mode.DISABLED);
        }

        mController.addListener(mListener);

        //Cancel pending new mail notifications when we open an account
        Account[] accountsWithNotification;

        Account account = mAccount;
        if (account != null) {
            accountsWithNotification = new Account[] { account };
        } else {
            accountsWithNotification = mPreferences.getAccounts();
        }

        for (Account accountWithNotification : accountsWithNotification) {
            mController.notifyAccountCancel(appContext, accountWithNotification);
        }

        if (mAccount != null && mFolderName != null && !mRemoteSearch) {
            mController.getFolderUnreadMessageCount(mAccount, mFolderName, mListener);
        }

        refreshTitle();
    }

    private void initializeLayout() {
        mListView = mPullToRefreshView.getRefreshableView();
        mListView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
        mListView.setLongClickable(true);
        mListView.setFastScrollEnabled(true);
        mListView.setScrollingCacheEnabled(false);
        mListView.setOnItemClickListener(this);

        registerForContextMenu(mListView);
    }

    private void onOpenMessage(MessageReference reference) {
        mFragmentListener.openMessage(reference);
    }

    public void onCompose() {
        if (!mSingleAccountMode) {
            /*
             * If we have a query string, we don't have an account to let
             * compose start the default action.
             */
            mFragmentListener.onCompose(null);
        } else {
            mFragmentListener.onCompose(mAccount);
        }
    }

    public void onReply(Message message) {
        mFragmentListener.onReply(message);
    }

    public void onReplyAll(Message message) {
        mFragmentListener.onReplyAll(message);
    }

    public void onForward(Message message) {
        mFragmentListener.onForward(message);
    }

    public void onResendMessage(Message message) {
        mFragmentListener.onResendMessage(message);
    }

    public void changeSort(SortType sortType) {
        Boolean sortAscending = (mSortType == sortType) ? !mSortAscending : null;
        changeSort(sortType, sortAscending);
    }

    /**
     * User has requested a remote search.  Setup the bundle and start the intent.
     */
    public void onRemoteSearchRequested() {
        String searchAccount;
        String searchFolder;

        searchAccount = mAccount.getUuid();
        searchFolder = mCurrentFolder.name;

        mFragmentListener.remoteSearch(searchAccount, searchFolder, mSearch.getRemoteSearchArguments());
    }

    /**
     * Change the sort type and sort order used for the message list.
     *
     * @param sortType
     *         Specifies which field to use for sorting the message list.
     * @param sortAscending
     *         Specifies the sort order. If this argument is {@code null} the default search order
     *         for the sort type is used.
     */
    // FIXME: Don't save the changes in the UI thread
    private void changeSort(SortType sortType, Boolean sortAscending) {
        mSortType = sortType;

        Account account = mAccount;

        if (account != null) {
            account.setSortType(mSortType);

            if (sortAscending == null) {
                mSortAscending = account.isSortAscending(mSortType);
            } else {
                mSortAscending = sortAscending;
            }
            account.setSortAscending(mSortType, mSortAscending);
            mSortDateAscending = account.isSortAscending(SortType.SORT_DATE);

            account.save(mPreferences);
        } else {
            K9.setSortType(mSortType);

            if (sortAscending == null) {
                mSortAscending = K9.isSortAscending(mSortType);
            } else {
                mSortAscending = sortAscending;
            }
            K9.setSortAscending(mSortType, mSortAscending);
            mSortDateAscending = K9.isSortAscending(SortType.SORT_DATE);

            Editor editor = mPreferences.getPreferences().edit();
            K9.save(editor);
            editor.commit();
        }

        reSort();
    }

    private void reSort() {
        int toastString = mSortType.getToast(mSortAscending);

        Toast toast = Toast.makeText(getActivity(), toastString, Toast.LENGTH_SHORT);
        toast.show();

        LoaderManager loaderManager = getLoaderManager();
        for (int i = 0, len = mAccountUuids.length; i < len; i++) {
            loaderManager.restartLoader(i, null, this);
        }
    }

    public void onCycleSort() {
        SortType[] sorts = SortType.values();
        int curIndex = 0;

        for (int i = 0; i < sorts.length; i++) {
            if (sorts[i] == mSortType) {
                curIndex = i;
                break;
            }
        }

        curIndex++;

        if (curIndex == sorts.length) {
            curIndex = 0;
        }

        changeSort(sorts[curIndex]);
    }

    private void onDelete(Message message) {
        onDelete(new Message[] { message });
    }

    private void onDelete(Message[] messages) {
        mController.deleteMessages(messages, null);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_OK) {
            return;
        }

        switch (requestCode) {
        case ACTIVITY_CHOOSE_FOLDER_MOVE:
        case ACTIVITY_CHOOSE_FOLDER_COPY: {
            if (data == null) {
                return;
            }

            final String destFolderName = data.getStringExtra(ChooseFolder.EXTRA_NEW_FOLDER);
            final Message[] messages = mActiveMessages;

            if (destFolderName != null) {

                mActiveMessages = null; // don't need it any more

                final Account account = messages[0].getFolder().getAccount();
                account.setLastSelectedFolderName(destFolderName);

                switch (requestCode) {
                case ACTIVITY_CHOOSE_FOLDER_MOVE:
                    move(messages, destFolderName);
                    break;

                case ACTIVITY_CHOOSE_FOLDER_COPY:
                    copy(messages, destFolderName);
                    break;
                }
            }
            break;
        }
        }
    }

    public void onExpunge() {
        if (mCurrentFolder != null) {
            onExpunge(mAccount, mCurrentFolder.name);
        }
    }

    private void onExpunge(final Account account, String folderName) {
        mController.expunge(account, folderName, null);
    }

    private void showDialog(int dialogId) {
        DialogFragment fragment;
        switch (dialogId) {
            case R.id.dialog_confirm_spam: {
                String title = getString(R.string.dialog_confirm_spam_title);

                int selectionSize = mActiveMessages.length;
                String message = getResources().getQuantityString(
                        R.plurals.dialog_confirm_spam_message, selectionSize,
                        Integer.valueOf(selectionSize));

                String confirmText = getString(R.string.dialog_confirm_spam_confirm_button);
                String cancelText = getString(R.string.dialog_confirm_spam_cancel_button);

                fragment = ConfirmationDialogFragment.newInstance(dialogId, title, message,
                        confirmText, cancelText);
                break;
            }
            default: {
                throw new RuntimeException("Called showDialog(int) with unknown dialog id.");
            }
        }

        fragment.setTargetFragment(this, dialogId);
        fragment.show(getFragmentManager(), getDialogTag(dialogId));
    }

    private String getDialogTag(int dialogId) {
        return String.format("dialog-%d", dialogId);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int itemId = item.getItemId();
        switch (itemId) {
        case R.id.set_sort_date: {
            changeSort(SortType.SORT_DATE);
            return true;
        }
        case R.id.set_sort_arrival: {
            changeSort(SortType.SORT_ARRIVAL);
            return true;
        }
        case R.id.set_sort_subject: {
            changeSort(SortType.SORT_SUBJECT);
            return true;
        }
//        case R.id.set_sort_sender: {
//            changeSort(SortType.SORT_SENDER);
//            return true;
//        }
        case R.id.set_sort_flag: {
            changeSort(SortType.SORT_FLAGGED);
            return true;
        }
        case R.id.set_sort_unread: {
            changeSort(SortType.SORT_UNREAD);
            return true;
        }
        case R.id.set_sort_attach: {
            changeSort(SortType.SORT_ATTACHMENT);
            return true;
        }
        case R.id.select_all: {
            selectAll();
            return true;
        }
        }

        if (!mSingleAccountMode) {
            // None of the options after this point are "safe" for search results
            //TODO: This is not true for "unread" and "starred" searches in regular folders
            return false;
        }

        switch (itemId) {
        case R.id.send_messages: {
            onSendPendingMessages();
            return true;
        }
        case R.id.expunge: {
            if (mCurrentFolder != null) {
                onExpunge(mAccount, mCurrentFolder.name);
            }
            return true;
        }
        default: {
            return super.onOptionsItemSelected(item);
        }
        }
    }

    public void onSendPendingMessages() {
        mController.sendPendingMessages(mAccount, null);
    }

    @Override
    public boolean onContextItemSelected(android.view.MenuItem item) {
        AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
        int adapterPosition = listViewToAdapterPosition(info.position);
        Message message = getMessageAtPosition(adapterPosition);

        switch (item.getItemId()) {
            case R.id.reply: {
                onReply(message);
                break;
            }
            case R.id.reply_all: {
                onReplyAll(message);
                break;
            }
            case R.id.forward: {
                onForward(message);
                break;
            }
            case R.id.send_again: {
                onResendMessage(message);
                mSelectedCount = 0;
                break;
            }
            case R.id.same_sender: {
                Cursor cursor = (Cursor) mAdapter.getItem(adapterPosition);
                String senderAddress = getSenderAddressFromCursor(cursor);
                if (senderAddress != null) {
                    mFragmentListener.showMoreFromSameSender(senderAddress);
                }
                break;
            }
            case R.id.delete: {
                onDelete(message);
                break;
            }
            case R.id.mark_as_read: {
                setFlag(message, Flag.SEEN, true);
                break;
            }
            case R.id.mark_as_unread: {
                setFlag(message, Flag.SEEN, false);
                break;
            }
            case R.id.flag: {
                setFlag(message, Flag.FLAGGED, true);
                break;
            }
            case R.id.unflag: {
                setFlag(message, Flag.FLAGGED, false);
                break;
            }

            // only if the account supports this
            case R.id.archive: {
                onArchive(message);
                break;
            }
            case R.id.spam: {
                onSpam(message);
                break;
            }
            case R.id.move: {
                onMove(message);
                break;
            }
            case R.id.copy: {
                onCopy(message);
                break;
            }
        }

        return true;
    }


    private String getSenderAddressFromCursor(Cursor cursor) {
        String fromList = cursor.getString(SENDER_LIST_COLUMN);
        Address[] fromAddrs = Address.unpack(fromList);
        return (fromAddrs.length > 0) ? fromAddrs[0].getAddress() : null;
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);

        AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo;
        Cursor cursor = (Cursor) mListView.getItemAtPosition(info.position);

        if (cursor == null) {
            return;
        }

        getActivity().getMenuInflater().inflate(R.menu.message_list_item_context, menu);

        Account account = getAccountFromCursor(cursor);

        String subject = cursor.getString(SUBJECT_COLUMN);
        String flagList = cursor.getString(FLAGS_COLUMN);
        String[] flags = flagList.split(",");
        boolean read = false;
        boolean flagged = false;
        for (int i = 0, len = flags.length; i < len; i++) {
            try {
                switch (Flag.valueOf(flags[i])) {
                    case SEEN: {
                        read = true;
                        break;
                    }
                    case FLAGGED: {
                        flagged = true;
                        break;
                    }
                    default: {
                        // We don't care about the other flags
                    }
                }
            } catch (Exception e) { /* ignore */ }
        }

        menu.setHeaderTitle(subject);

        if (read) {
            menu.findItem(R.id.mark_as_read).setVisible(false);
        } else {
            menu.findItem(R.id.mark_as_unread).setVisible(false);
        }

        if (flagged) {
            menu.findItem(R.id.flag).setVisible(false);
        } else {
            menu.findItem(R.id.unflag).setVisible(false);
        }

        if (!mController.isCopyCapable(account)) {
            menu.findItem(R.id.copy).setVisible(false);
        }

        if (!mController.isMoveCapable(account)) {
            menu.findItem(R.id.move).setVisible(false);
            menu.findItem(R.id.archive).setVisible(false);
            menu.findItem(R.id.spam).setVisible(false);
        }

        if (!account.hasArchiveFolder()) {
            menu.findItem(R.id.archive).setVisible(false);
        }

        if (!account.hasSpamFolder()) {
            menu.findItem(R.id.spam).setVisible(false);
        }

    }

    public void onSwipeRightToLeft(final MotionEvent e1, final MotionEvent e2) {
        // Handle right-to-left as an un-select
        handleSwipe(e1, false);
    }

    public void onSwipeLeftToRight(final MotionEvent e1, final MotionEvent e2) {
        // Handle left-to-right as a select.
        handleSwipe(e1, true);
    }

    /**
     * Handle a select or unselect swipe event
     * @param downMotion Event that started the swipe
     * @param selected true if this was an attempt to select (i.e. left to right).
     */
    private void handleSwipe(final MotionEvent downMotion, final boolean selected) {
        int[] listPosition = new int[2];
        mListView.getLocationOnScreen(listPosition);

        int listX = (int) downMotion.getRawX() - listPosition[0];
        int listY = (int) downMotion.getRawY() - listPosition[1];

        int listViewPosition = mListView.pointToPosition(listX, listY);

        toggleMessageSelect(listViewPosition);
    }

    private int listViewToAdapterPosition(int position) {
        if (position > 0 && position <= mAdapter.getCount()) {
            return position - 1;
        }

        return AdapterView.INVALID_POSITION;
    }

    class MessageListActivityListener extends ActivityListener {
        @Override
        public void remoteSearchFailed(Account acct, String folder, final String err) {
            //TODO: Better error handling
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getActivity(), err, Toast.LENGTH_LONG).show();
                }
            });
        }

        @Override
        public void remoteSearchStarted(Account acct, String folder) {
            mHandler.progress(true);
            mHandler.updateFooter(mContext.getString(R.string.remote_search_sending_query), true);
        }


        @Override
        public void remoteSearchFinished(Account acct, String folder, int numResults, List<Message> extraResults) {
            mHandler.progress(false);
            if (extraResults != null && extraResults.size() > 0) {
                mHandler.updateFooter(String.format(mContext.getString(R.string.load_more_messages_fmt), acct.getRemoteSearchNumResults()), false);
            } else {
                mHandler.updateFooter("", false);
            }
            mFragmentListener.setMessageListProgress(Window.PROGRESS_END);

        }

        @Override
        public void remoteSearchServerQueryComplete(Account account, String folderName, int numResults) {
            mHandler.progress(true);
            if (account != null &&  account.getRemoteSearchNumResults() != 0 && numResults > account.getRemoteSearchNumResults()) {
                mHandler.updateFooter(mContext.getString(R.string.remote_search_downloading_limited, account.getRemoteSearchNumResults(), numResults), true);
            } else {
                mHandler.updateFooter(mContext.getString(R.string.remote_search_downloading, numResults), true);
            }
            mFragmentListener.setMessageListProgress(Window.PROGRESS_START);
        }

        @Override
        public void informUserOfStatus() {
            mHandler.refreshTitle();
        }

        @Override
        public void synchronizeMailboxStarted(Account account, String folder) {
            if (updateForMe(account, folder)) {
                mHandler.progress(true);
                mHandler.folderLoading(folder, true);
            }
            super.synchronizeMailboxStarted(account, folder);
        }

        @Override
        public void synchronizeMailboxFinished(Account account, String folder,
        int totalMessagesInMailbox, int numNewMessages) {

            if (updateForMe(account, folder)) {
                mHandler.progress(false);
                mHandler.folderLoading(folder, false);
            }
            super.synchronizeMailboxFinished(account, folder, totalMessagesInMailbox, numNewMessages);
        }

        @Override
        public void synchronizeMailboxFailed(Account account, String folder, String message) {

            if (updateForMe(account, folder)) {
                mHandler.progress(false);
                mHandler.folderLoading(folder, false);
            }
            super.synchronizeMailboxFailed(account, folder, message);
        }

        @Override
        public void searchStats(AccountStats stats) {
            mUnreadMessageCount = stats.unreadMessageCount;
            super.searchStats(stats);
        }

        @Override
        public void folderStatusChanged(Account account, String folder, int unreadMessageCount) {
            if (updateForMe(account, folder)) {
                mUnreadMessageCount = unreadMessageCount;
            }
            super.folderStatusChanged(account, folder, unreadMessageCount);
        }

        private boolean updateForMe(Account account, String folder) {
            //FIXME
            return ((account.equals(mAccount) && folder.equals(mFolderName)));
        }
    }


    class MessageListAdapter extends CursorAdapter {

        private Drawable mAttachmentIcon;
        private Drawable mForwardedIcon;
        private Drawable mAnsweredIcon;
        private Drawable mForwardedAnsweredIcon;

        MessageListAdapter() {
            super(getActivity(), null, 0);
            mAttachmentIcon = getResources().getDrawable(R.drawable.ic_email_attachment_small);
            mAnsweredIcon = getResources().getDrawable(R.drawable.ic_email_answered_small);
            mForwardedIcon = getResources().getDrawable(R.drawable.ic_email_forwarded_small);
            mForwardedAnsweredIcon = getResources().getDrawable(R.drawable.ic_email_forwarded_answered_small);
        }

        /**
         * Set the selection state for all messages at once.
         * @param selected Selection state to set.
         */
        public void setSelectionForAllMesages(final boolean selected) {
            //TODO: implement

            //notifyDataSetChanged();
        }

        private String recipientSigil(boolean toMe, boolean ccMe) {
            if (toMe) {
                return getString(R.string.messagelist_sent_to_me_sigil);
            } else if (ccMe) {
                return getString(R.string.messagelist_sent_cc_me_sigil);
            } else {
                return "";
            }
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            View view = mInflater.inflate(R.layout.message_list_item, parent, false);
            view.setId(R.layout.message_list_item);

            MessageViewHolder holder = new MessageViewHolder();
            holder.date = (TextView) view.findViewById(R.id.date);
            holder.chip = view.findViewById(R.id.chip);
            holder.preview = (TextView) view.findViewById(R.id.preview);

            if (mSenderAboveSubject) {
                holder.from = (TextView) view.findViewById(R.id.subject);
                holder.from.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSizes.getMessageListSender());
            } else {
                holder.subject = (TextView) view.findViewById(R.id.subject);
                holder.subject.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSizes.getMessageListSubject());
            }

            holder.date.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSizes.getMessageListDate());

            holder.preview.setLines(mPreviewLines);
            holder.preview.setTextSize(TypedValue.COMPLEX_UNIT_SP, mFontSizes.getMessageListPreview());
            holder.threadCount = (TextView) view.findViewById(R.id.thread_count);

            view.setTag(holder);

            return view;
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            Account account = getAccountFromCursor(cursor);

            String fromList = cursor.getString(SENDER_LIST_COLUMN);
            String toList = cursor.getString(TO_LIST_COLUMN);
            String ccList = cursor.getString(CC_LIST_COLUMN);
            Address[] fromAddrs = Address.unpack(fromList);
            Address[] toAddrs = Address.unpack(toList);
            Address[] ccAddrs = Address.unpack(ccList);

            boolean fromMe = mMessageHelper.toMe(account, fromAddrs);
            boolean toMe = mMessageHelper.toMe(account, toAddrs);
            boolean ccMe = mMessageHelper.toMe(account, ccAddrs);

            CharSequence displayName = mMessageHelper.getDisplayName(account, fromAddrs, toAddrs);

            Date sentDate = new Date(cursor.getLong(DATE_COLUMN));
            String displayDate = mMessageHelper.formatDate(sentDate);

            String preview = cursor.getString(PREVIEW_COLUMN);
            if (preview == null) {
                preview = "";
            }

            String subject = cursor.getString(SUBJECT_COLUMN);
            if (StringUtils.isNullOrEmpty(subject)) {
                subject = getString(R.string.general_no_subject);
            }

            int threadCount = (mThreadedList) ? cursor.getInt(THREAD_COUNT_COLUMN) : 0;

            String flagList = cursor.getString(FLAGS_COLUMN);
            String[] flags = flagList.split(",");
            boolean read = false;
            boolean flagged = false;
            boolean answered = false;
            boolean forwarded = false;
            for (int i = 0, len = flags.length; i < len; i++) {
                try {
                    switch (Flag.valueOf(flags[i])) {
                        case SEEN: {
                            read = true;
                            break;
                        }
                        case FLAGGED: {
                            flagged = true;
                            break;
                        }
                        case ANSWERED: {
                            answered = true;
                            break;
                        }
                        case FORWARDED: {
                            forwarded = true;
                            break;
                        }
                        default: {
                            // We don't care about the other flags
                        }
                    }
                } catch (Exception e) { /* ignore */ }
            }

            boolean hasAttachments = (cursor.getInt(ATTACHMENT_COUNT_COLUMN) > 0);

            MessageViewHolder holder = (MessageViewHolder) view.getTag();

            int maybeBoldTypeface = (read) ? Typeface.NORMAL : Typeface.BOLD;

            int adapterPosition = cursor.getPosition();
            boolean selected = mSelected.get(adapterPosition, false);

            if (selected) {
                holder.chip.setBackgroundDrawable(account.getCheckmarkChip().drawable());
            } else {
                holder.chip.setBackgroundDrawable(account.generateColorChip(read, toMe, ccMe,
                        fromMe, flagged).drawable());
            }

            // Background indicator
            if (K9.useBackgroundAsUnreadIndicator()) {
                int res = (read) ? R.attr.messageListReadItemBackgroundColor :
                        R.attr.messageListUnreadItemBackgroundColor;

                TypedValue outValue = new TypedValue();
                getActivity().getTheme().resolveAttribute(res, outValue, true);
                view.setBackgroundColor(outValue.data);
            }

            // Thread count
            if (threadCount > 1) {
                holder.threadCount.setText(Integer.toString(threadCount));
                holder.threadCount.setVisibility(View.VISIBLE);
            } else {
                holder.threadCount.setVisibility(View.GONE);
            }

            CharSequence beforePreviewText = (mSenderAboveSubject) ? subject : displayName;

            String sigil = recipientSigil(toMe, ccMe);

            holder.preview.setText(
                    new SpannableStringBuilder(sigil)
                        .append(beforePreviewText)
                        .append(" ")
                        .append(preview), TextView.BufferType.SPANNABLE);

            Spannable str = (Spannable)holder.preview.getText();

            // Create a span section for the sender, and assign the correct font size and weight
            int fontSize = (mSenderAboveSubject) ?
                    mFontSizes.getMessageListSubject():
                    mFontSizes.getMessageListSender();

            AbsoluteSizeSpan span = new AbsoluteSizeSpan(fontSize, true);
            str.setSpan(span, 0, beforePreviewText.length() + 1,
                    Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            //TODO: make this part of the theme
            int color = (K9.getK9Theme() == K9.THEME_LIGHT) ?
                    Color.rgb(105, 105, 105) :
                    Color.rgb(160, 160, 160);

            // Set span (color) for preview message
            str.setSpan(new ForegroundColorSpan(color), beforePreviewText.length() + 1,
                    str.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            Drawable statusHolder = null;
            if (forwarded && answered) {
                statusHolder = mForwardedAnsweredIcon;
            } else if (answered) {
                statusHolder = mAnsweredIcon;
            } else if (forwarded) {
                statusHolder = mForwardedIcon;
            }

            if (holder.from != null ) {
                holder.from.setTypeface(null, maybeBoldTypeface);
                if (mSenderAboveSubject) {
                    holder.from.setCompoundDrawablesWithIntrinsicBounds(
                            statusHolder, // left
                            null, // top
                            hasAttachments ? mAttachmentIcon : null, // right
                            null); // bottom

                    holder.from.setText(displayName);
                } else {
                    holder.from.setText(new SpannableStringBuilder(sigil).append(displayName));
                }
            }

            if (holder.subject != null ) {
                if (!mSenderAboveSubject) {
                    holder.subject.setCompoundDrawablesWithIntrinsicBounds(
                            statusHolder, // left
                            null, // top
                            hasAttachments ? mAttachmentIcon : null, // right
                            null); // bottom
                }

                holder.subject.setTypeface(null, maybeBoldTypeface);
                holder.subject.setText(subject);
            }

            holder.date.setText(displayDate);
        }
    }

    class MessageViewHolder {
        public TextView subject;
        public TextView preview;
        public TextView from;
        public TextView time;
        public TextView date;
        public View chip;
        public TextView threadCount;
    }


    private View getFooterView(ViewGroup parent) {
        if (mFooterView == null) {
            mFooterView = mInflater.inflate(R.layout.message_list_item_footer, parent, false);
            mFooterView.setId(R.layout.message_list_item_footer);
            FooterViewHolder holder = new FooterViewHolder();
            holder.progress = (ProgressBar) mFooterView.findViewById(R.id.message_list_progress);
            holder.progress.setIndeterminate(true);
            holder.main = (TextView) mFooterView.findViewById(R.id.main_text);
            mFooterView.setTag(holder);
        }

        return mFooterView;
    }

    private void updateFooterView() {
        if (mCurrentFolder != null && mAccount != null) {
            if (mCurrentFolder.loading) {
                final boolean showProgress = true;
                updateFooter(mContext.getString(R.string.status_loading_more), showProgress);
            } else {
                String message;
                if (!mCurrentFolder.lastCheckFailed) {
                    if (mAccount.getDisplayCount() == 0) {
                        message = mContext.getString(R.string.message_list_load_more_messages_action);
                    } else {
                        message = String.format(mContext.getString(R.string.load_more_messages_fmt), mAccount.getDisplayCount());
                    }
                } else {
                    message = mContext.getString(R.string.status_loading_more_failed);
                }
                final boolean showProgress = false;
                updateFooter(message, showProgress);
            }
        } else {
            final boolean showProgress = false;
            updateFooter(null, showProgress);
        }
    }

    public void updateFooter(final String text, final boolean progressVisible) {
        if (mFooterView == null) {
            return;
        }

        FooterViewHolder holder = (FooterViewHolder) mFooterView.getTag();

        holder.progress.setVisibility(progressVisible ? ProgressBar.VISIBLE : ProgressBar.INVISIBLE);
        if (text != null) {
            holder.main.setText(text);
        }
        if (progressVisible || holder.main.getText().length() > 0) {
            holder.main.setVisibility(View.VISIBLE);
        } else {
            holder.main.setVisibility(View.GONE);
        }
    }

    static class FooterViewHolder {
        public ProgressBar progress;
        public TextView main;
    }

    /**
     * Set selection state for all messages.
     *
     * @param selected
     *         If {@code true} all messages get selected. Otherwise, all messages get deselected and
     *         action mode is finished.
     */
    private void setSelectionState(boolean selected) {
        if (selected) {
            mSelectedCount = mAdapter.getCount();
            if (mSelectedCount == 0) {
                // Nothing to do if there are no messages
                return;
            }

            for (int i = 0, end = mSelectedCount; i < end; i++) {
                mSelected.put(i, true);
            }

            if (mActionMode == null) {
                mActionMode = getSherlockActivity().startActionMode(mActionModeCallback);
            }
            computeBatchDirection();
            updateActionModeTitle();
            computeSelectAllVisibility();
        } else {
            mSelected.clear();
            mSelectedCount = 0;
            if (mActionMode != null) {
                mActionMode.finish();
                mActionMode = null;
            }
        }

        mAdapter.notifyDataSetChanged();
    }

    private void toggleMessageSelect(int listViewPosition) {
        int adapterPosition = listViewToAdapterPosition(listViewPosition);
        if (adapterPosition == AdapterView.INVALID_POSITION) {
            return;
        }

        boolean selected = mSelected.get(adapterPosition, false);
        mSelected.put(adapterPosition, !selected);

        if (mActionMode != null) {
            if (mSelectedCount == 1 && selected) {
                mActionMode.finish();
                mActionMode = null;
                return;
            }
        } else {
            mActionMode = getSherlockActivity().startActionMode(mActionModeCallback);
        }

        if (selected) {
            mSelectedCount -= 1;
        } else {
            mSelectedCount += 1;
        }

        computeBatchDirection();
        updateActionModeTitle();

        // make sure the onPrepareActionMode is called
        mActionMode.invalidate();

        computeSelectAllVisibility();

        mAdapter.notifyDataSetChanged();
    }

    private void updateActionModeTitle() {
        mActionMode.setTitle(String.format(getString(R.string.actionbar_selected), mSelectedCount));
    }

    private void computeSelectAllVisibility() {
        mActionModeCallback.showSelectAll(mSelectedCount != mAdapter.getCount());
    }

    private void computeBatchDirection() {
        boolean isBatchFlag = false;
        boolean isBatchRead = false;

        /*
        for (MessageInfoHolder holder : mAdapter.getMessages()) {
            if (holder.selected) {
                if (!holder.flagged) {
                    isBatchFlag = true;
                }
                if (!holder.read) {
                    isBatchRead = true;
                }

                if (isBatchFlag && isBatchRead) {
                    break;
                }
            }
        }
        */
        //TODO: implement

        mActionModeCallback.showMarkAsRead(isBatchRead);
        mActionModeCallback.showFlag(isBatchFlag);
    }

    private void setFlag(Message message, final Flag flag, final boolean newState) {
        setFlag(new Message[] { message }, flag, newState);
    }

    private void setFlag(Message[] messages, final Flag flag, final boolean newState) {
        if (messages.length == 0) {
            return;
        }

        mController.setFlag(messages, flag, newState);

        computeBatchDirection();
    }

    private void onMove(Message message) {
        onMove(new Message[] { message });
    }

    /**
     * Display the message move activity.
     *
     * @param holders
     *            Never {@code null}.
     */
    private void onMove(Message[] messages) {
        if (!checkCopyOrMovePossible(messages, FolderOperation.MOVE)) {
            return;
        }

        final Folder folder = messages.length == 1 ? messages[0].getFolder() : mCurrentFolder.folder;
        displayFolderChoice(ACTIVITY_CHOOSE_FOLDER_MOVE, folder, messages);
    }

    private void onCopy(Message message) {
        onCopy(new Message[] { message });
    }

    /**
     * Display the message copy activity.
     *
     * @param holders
     *            Never {@code null}.
     */
    private void onCopy(Message[] messages) {
        if (!checkCopyOrMovePossible(messages, FolderOperation.COPY)) {
            return;
        }

        final Folder folder = messages.length == 1 ? messages[0].getFolder() : mCurrentFolder.folder;
        displayFolderChoice(ACTIVITY_CHOOSE_FOLDER_COPY, folder, messages);
    }

    /**
     * Helper method to manage the invocation of
     * {@link #startActivityForResult(Intent, int)} for a folder operation
     * ({@link ChooseFolder} activity), while saving a list of associated
     * messages.
     *
     * @param requestCode
     *            If >= 0, this code will be returned in onActivityResult() when
     *            the activity exits.
     * @param folder
     *            Never {@code null}.
     * @param holders
     *            Messages to be affected by the folder operation. Never
     *            {@code null}.
     * @see #startActivityForResult(Intent, int)
     */
    private void displayFolderChoice(final int requestCode, final Folder folder, final Message[] messages) {
        final Intent intent = new Intent(getActivity(), ChooseFolder.class);
        intent.putExtra(ChooseFolder.EXTRA_ACCOUNT, folder.getAccount().getUuid());
        intent.putExtra(ChooseFolder.EXTRA_CUR_FOLDER, folder.getName());
        intent.putExtra(ChooseFolder.EXTRA_SEL_FOLDER, folder.getAccount().getLastSelectedFolderName());
        // remember the selected messages for #onActivityResult
        mActiveMessages = messages;
        startActivityForResult(intent, requestCode);
    }

    private void onArchive(final Message message) {
        onArchive(new Message[] { message });
    }

    private void onArchive(final Message[] messages) {
        final String folderName = messages[0].getFolder().getAccount().getArchiveFolderName();
        if (K9.FOLDER_NONE.equalsIgnoreCase(folderName)) {
            return;
        }
        // TODO one should separate messages by account and call move afterwards
        // (because each account might have a specific Archive folder name)
        move(messages, folderName);
    }

    private void onSpam(Message message) {
        onSpam(new Message[] { message });
    }

    /**
     * @param holders
     *            Never {@code null}.
     */
    private void onSpam(Message[] messages) {
        if (K9.confirmSpam()) {
            // remember the message selection for #onCreateDialog(int)
            mActiveMessages = messages;
            showDialog(R.id.dialog_confirm_spam);
        } else {
            onSpamConfirmed(messages);
        }
    }

    /**
     * @param holders
     *            Never {@code null}.
     */
    private void onSpamConfirmed(Message[] messages) {
        final String folderName = messages[0].getFolder().getAccount().getSpamFolderName();
        if (K9.FOLDER_NONE.equalsIgnoreCase(folderName)) {
            return;
        }
        // TODO one should separate messages by account and call move afterwards
        // (because each account might have a specific Spam folder name)
        move(messages, folderName);
    }

    private static enum FolderOperation {
        COPY, MOVE
    }

    /**
     * Display an Toast message if any message isn't synchronized
     *
     * @param holders
     *            Never <code>null</code>.
     * @param operation
     *            Never {@code null}.
     *
     * @return <code>true</code> if operation is possible
     */
    private boolean checkCopyOrMovePossible(final Message[] messages, final FolderOperation operation) {
        if (messages.length == 0) {
            return false;
        }

        boolean first = true;
        for (final Message message : messages) {
            if (first) {
                first = false;
                // account check
                final Account account = message.getFolder().getAccount();
                if ((operation == FolderOperation.MOVE && !mController.isMoveCapable(account)) ||
                        (operation == FolderOperation.COPY && !mController.isCopyCapable(account))) {
                    return false;
                }
            }
            // message check
            if ((operation == FolderOperation.MOVE && !mController.isMoveCapable(message)) ||
                    (operation == FolderOperation.COPY && !mController.isCopyCapable(message))) {
                final Toast toast = Toast.makeText(getActivity(), R.string.move_copy_cannot_copy_unsynced_message,
                                                   Toast.LENGTH_LONG);
                toast.show();
                return false;
            }
        }
        return true;
    }

    /**
     * Copy the specified messages to the specified folder.
     *
     * @param holders Never {@code null}.
     * @param destination Never {@code null}.
     */
    private void copy(Message[] messages, final String destination) {
        copyOrMove(messages, destination, FolderOperation.COPY);
    }

    /**
     * Move the specified messages to the specified folder.
     *
     * @param holders Never {@code null}.
     * @param destination Never {@code null}.
     */
    private void move(Message[] messages, final String destination) {
        copyOrMove(messages, destination, FolderOperation.MOVE);
    }

    /**
     * The underlying implementation for {@link #copy(List, String)} and
     * {@link #move(List, String)}. This method was added mainly because those 2
     * methods share common behavior.
     *
     * Note: Must be called from the UI thread!
     *
     * @param holders
     *            Never {@code null}.
     * @param destination
     *            Never {@code null}.
     * @param operation
     *            Never {@code null}.
     */
    private void copyOrMove(Message[] messages, final String destination, final FolderOperation operation) {
        if (K9.FOLDER_NONE.equalsIgnoreCase(destination)) {
            return;
        }

        boolean first = true;
        Account account = null;
        String folderName = null;

        List<Message> outMessages = new ArrayList<Message>();

        for (Message message : messages) {
            if (first) {
                first = false;
                folderName = message.getFolder().getName();
                account = message.getFolder().getAccount();
                if ((operation == FolderOperation.MOVE && !mController.isMoveCapable(account)) || (operation == FolderOperation.COPY && !mController.isCopyCapable(account))) {
                    // account is not copy/move capable
                    return;
                }
            } else if (!account.equals(message.getFolder().getAccount())
                       || !folderName.equals(message.getFolder().getName())) {
                // make sure all messages come from the same account/folder?
                return;
            }
            if ((operation == FolderOperation.MOVE && !mController.isMoveCapable(message)) || (operation == FolderOperation.COPY && !mController.isCopyCapable(message))) {
                final Toast toast = Toast.makeText(getActivity(), R.string.move_copy_cannot_copy_unsynced_message,
                                                   Toast.LENGTH_LONG);
                toast.show();

                // XXX return meaningful error value?

                // message isn't synchronized
                return;
            }
            outMessages.add(message);
        }

        if (operation == FolderOperation.MOVE) {
            mController.moveMessages(account, folderName, outMessages.toArray(new Message[outMessages.size()]), destination,
                                     null);
        } else {
            mController.copyMessages(account, folderName, outMessages.toArray(new Message[outMessages.size()]), destination,
                                     null);
        }
    }

    /**
     * Return the currently "open" account if available.
     *
     * @param prefs
     *         A {@link Preferences} instance that might be used to retrieve the current
     *         {@link Account}.
     *
     * @return The {@code Account} all displayed messages belong to.
     */
    //TODO: remove
    /*private Account getCurrentAccount(Preferences prefs) {
        Account account = null;
        if (mQueryString != null && !mIntegrate && mAccountUuids != null &&
                mAccountUuids.length == 1) {
            String uuid = mAccountUuids[0];
            account = prefs.getAccount(uuid);
        } else if (mAccount != null) {
            account = mAccount;
        }

        return account;
    }*/


    class ActionModeCallback implements ActionMode.Callback {
        private MenuItem mSelectAll;
        private MenuItem mMarkAsRead;
        private MenuItem mMarkAsUnread;
        private MenuItem mFlag;
        private MenuItem mUnflag;

        @Override
        public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
            mSelectAll = menu.findItem(R.id.select_all);
            mMarkAsRead = menu.findItem(R.id.mark_as_read);
            mMarkAsUnread = menu.findItem(R.id.mark_as_unread);
            mFlag = menu.findItem(R.id.flag);
            mUnflag = menu.findItem(R.id.unflag);

            // we don't support cross account actions atm
            if (!mSingleAccountMode) {
                // show all
                menu.findItem(R.id.move).setVisible(true);
                menu.findItem(R.id.archive).setVisible(true);
                menu.findItem(R.id.spam).setVisible(true);
                menu.findItem(R.id.copy).setVisible(true);

                // hide uncapable
                /*
                 *  TODO think of a better way then looping over all
                 *  messages.
                 */
                Message[] messages = getCheckedMessages();
                Account account;

                for (Message message : messages) {
                    account = message.getFolder().getAccount();
                    setContextCapabilities(account, menu);
                }

            }
            return true;
        }

        @Override
        public void onDestroyActionMode(ActionMode mode) {
            mActionMode = null;
            mSelectAll = null;
            mMarkAsRead = null;
            mMarkAsUnread = null;
            mFlag = null;
            mUnflag = null;
            setSelectionState(false);
        }

        @Override
        public boolean onCreateActionMode(ActionMode mode, Menu menu) {
            MenuInflater inflater = mode.getMenuInflater();
            inflater.inflate(R.menu.message_list_context, menu);

            // check capabilities
            setContextCapabilities(mAccount, menu);

            return true;
        }

        /**
         * Disables menu options based on if the account supports it or not.
         * It also checks the controller and for now the 'mode' the messagelist
         * is operation in ( query or not ).
         *
         * @param mAccount Account to check capabilities of.
         * @param menu Menu to adapt.
         */
        private void setContextCapabilities(Account mAccount, Menu menu) {
            /*
             * TODO get rid of this when we finally split the messagelist into
             * a folder content display and a search result display
             */
            if (!mSingleAccountMode) {
                menu.findItem(R.id.move).setVisible(false);
                menu.findItem(R.id.copy).setVisible(false);

                menu.findItem(R.id.archive).setVisible(false);
                menu.findItem(R.id.spam).setVisible(false);

            } else {
                // hide unsupported
                if (!mController.isCopyCapable(mAccount)) {
                    menu.findItem(R.id.copy).setVisible(false);
                }

                if (!mController.isMoveCapable(mAccount)) {
                    menu.findItem(R.id.move).setVisible(false);
                    menu.findItem(R.id.archive).setVisible(false);
                    menu.findItem(R.id.spam).setVisible(false);
                }

                if (!mAccount.hasArchiveFolder()) {
                    menu.findItem(R.id.archive).setVisible(false);
                }

                if (!mAccount.hasSpamFolder()) {
                    menu.findItem(R.id.spam).setVisible(false);
                }
            }
        }

        public void showSelectAll(boolean show) {
            if (mActionMode != null) {
                mSelectAll.setVisible(show);
            }
        }

        public void showMarkAsRead(boolean show) {
            if (mActionMode != null) {
                mMarkAsRead.setVisible(show);
                mMarkAsUnread.setVisible(!show);
            }
        }

        public void showFlag(boolean show) {
            if (mActionMode != null) {
                mFlag.setVisible(show);
                mUnflag.setVisible(!show);
            }
        }

        @Override
        public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
            Message[] messages = getCheckedMessages();

            /*
             * In the following we assume that we can't move or copy
             * mails to the same folder. Also that spam isn't available if we are
             * in the spam folder,same for archive.
             *
             * This is the case currently so safe assumption.
             */
            switch (item.getItemId()) {
            case R.id.delete: {
                onDelete(messages);

                //FIXME
                mSelectedCount = 0;
                break;
            }
            case R.id.mark_as_read: {
                setFlag(messages, Flag.SEEN, true);
                break;
            }
            case R.id.mark_as_unread: {
                setFlag(messages, Flag.SEEN, false);
                break;
            }
            case R.id.flag: {
                setFlag(messages, Flag.FLAGGED, true);
                break;
            }
            case R.id.unflag: {
                setFlag(messages, Flag.FLAGGED, false);
                break;
            }
            case R.id.select_all: {
                selectAll();
                break;
            }

            // only if the account supports this
            case R.id.archive: {
                onArchive(messages);
                mSelectedCount = 0;
                break;
            }
            case R.id.spam: {
                onSpam(messages);
                mSelectedCount = 0;
                break;
            }
            case R.id.move: {
                onMove(messages);
                mSelectedCount = 0;
                break;
            }
            case R.id.copy: {
                onCopy(messages);
                mSelectedCount = 0;
                break;
            }
            }
            if (mSelectedCount == 0) {
                mActionMode.finish();
            }

            return true;
        }
    }

    @Override
    public void doPositiveClick(int dialogId) {
        switch (dialogId) {
            case R.id.dialog_confirm_spam: {
                onSpamConfirmed(mActiveMessages);
                // No further need for this reference
                mActiveMessages = null;
                break;
            }
        }
    }

    @Override
    public void doNegativeClick(int dialogId) {
        switch (dialogId) {
            case R.id.dialog_confirm_spam: {
                // No further need for this reference
                mActiveMessages = null;
                break;
            }
        }
    }

    @Override
    public void dialogCancelled(int dialogId) {
        doNegativeClick(dialogId);
    }

    public void checkMail() {
        mController.synchronizeMailbox(mAccount, mFolderName, mListener, null);
        mController.sendPendingMessages(mAccount, mListener);
    }

    /**
     * We need to do some special clean up when leaving a remote search result screen.  If no remote search is
     * in progress, this method does nothing special.
     */
    @Override
    public void onStop() {
        // If we represent a remote search, then kill that before going back.
        if (isRemoteSearch() && mRemoteSearchFuture != null) {
            try {
                Log.i(K9.LOG_TAG, "Remote search in progress, attempting to abort...");
                // Canceling the future stops any message fetches in progress.
                final boolean cancelSuccess = mRemoteSearchFuture.cancel(true);   // mayInterruptIfRunning = true
                if (!cancelSuccess) {
                    Log.e(K9.LOG_TAG, "Could not cancel remote search future.");
                }
                // Closing the folder will kill off the connection if we're mid-search.
                final Account searchAccount = mAccount;
                final Folder remoteFolder = mCurrentFolder.folder;
                remoteFolder.close();
                // Send a remoteSearchFinished() message for good measure.
                //mAdapter.mListener.remoteSearchFinished(searchAccount, mCurrentFolder.name, 0, null);
            } catch (Exception e) {
                // Since the user is going back, log and squash any exceptions.
                Log.e(K9.LOG_TAG, "Could not abort remote search before going back", e);
            }
        }
        super.onStop();
    }

    public ArrayList<MessageReference> getMessageReferences() {
        ArrayList<MessageReference> messageRefs = new ArrayList<MessageReference>();

        for (int i = 0, len = mAdapter.getCount(); i < len; i++) {
            Cursor cursor = (Cursor) mAdapter.getItem(i);

            MessageReference ref = new MessageReference();
            ref.accountUuid = cursor.getString(ACCOUNT_UUID_COLUMN);
            ref.folderName = cursor.getString(FOLDER_NAME_COLUMN);
            ref.uid = cursor.getString(UID_COLUMN);

            messageRefs.add(ref);
        }

        return messageRefs;
    }

    public void selectAll() {
        setSelectionState(true);
    }

    public void onMoveUp() {
        int currentPosition = mListView.getSelectedItemPosition();
        if (currentPosition == AdapterView.INVALID_POSITION || mListView.isInTouchMode()) {
            currentPosition = mListView.getFirstVisiblePosition();
        }
        if (currentPosition > 0) {
            mListView.setSelection(currentPosition - 1);
        }
    }

    public void onMoveDown() {
        int currentPosition = mListView.getSelectedItemPosition();
        if (currentPosition == AdapterView.INVALID_POSITION || mListView.isInTouchMode()) {
            currentPosition = mListView.getFirstVisiblePosition();
        }

        if (currentPosition < mListView.getCount()) {
            mListView.setSelection(currentPosition + 1);
        }
    }

    public interface MessageListFragmentListener {
        void setMessageListProgress(int level);
        void showThread(Account account, String folderName, long rootId);
        void remoteSearch(String searchAccount, String searchFolder, String queryString);
        void showMoreFromSameSender(String senderAddress);
        void onResendMessage(Message message);
        void onForward(Message message);
        void onReply(Message message);
        void onReplyAll(Message message);
        void openMessage(MessageReference messageReference);
        void setMessageListTitle(String title);
        void setMessageListSubTitle(String subTitle);
        void setUnreadCount(int unread);
        void onCompose(Account account);
        boolean startSearch(Account account, String folderName);
    }

    public void onReverseSort() {
        changeSort(mSortType);
    }

    private Message getSelectedMessage() {
        int listViewPosition = mListView.getSelectedItemPosition();
        int adapterPosition = listViewToAdapterPosition(listViewPosition);

        return getMessageAtPosition(adapterPosition);
    }

    private Message getMessageAtPosition(int adapterPosition) {
        if (adapterPosition == AdapterView.INVALID_POSITION) {
            return null;
        }

        Cursor cursor = (Cursor) mAdapter.getItem(adapterPosition);
        String uid = cursor.getString(UID_COLUMN);

        Account account = getAccountFromCursor(cursor);
        long folderId = cursor.getLong(FOLDER_ID_COLUMN);
        Folder folder = getFolderById(account, folderId);

        try {
            return folder.getMessage(uid);
        } catch (MessagingException e) {
            Log.e(K9.LOG_TAG, "Something went wrong while fetching a message", e);
        }

        return null;
    }

    private Message[] getCheckedMessages() {
        Message[] messages = new Message[mSelectedCount];
        int out = 0;
        for (int position = 0, end = mAdapter.getCount(); position < end; position++) {
            if (mSelected.get(position, false)) {
                messages[out++] = getMessageAtPosition(position);
            }
        }

        return messages;
    }

    public void onDelete() {
        Message message = getSelectedMessage();
        if (message != null) {
            onDelete(new Message[] { message });
        }
    }

    public void toggleMessageSelect() {
        toggleMessageSelect(mListView.getSelectedItemPosition());
    }

    public void onToggleFlag() {
        Message message = getSelectedMessage();
        if (message != null) {
            setFlag(message, Flag.FLAGGED, !message.isSet(Flag.FLAGGED));
        }
    }

    public void onMove() {
        Message message = getSelectedMessage();
        if (message != null) {
            onMove(message);
        }
    }

    public void onArchive() {
        Message message = getSelectedMessage();
        if (message != null) {
            onArchive(message);
        }
    }

    public void onCopy() {
        Message message = getSelectedMessage();
        if (message != null) {
            onCopy(message);
        }
    }

    public void onToggleRead() {
        Message message = getSelectedMessage();
        if (message != null) {
            setFlag(message, Flag.SEEN, !message.isSet(Flag.SEEN));
        }
    }

    public boolean isSearchQuery() {
        return (mSearch.getRemoteSearchArguments() != null || !mSingleAccountMode);
    }

    public boolean isOutbox() {
        return (mFolderName != null && mFolderName.equals(mAccount.getOutboxFolderName()));
    }

    public boolean isErrorFolder() {
        return K9.ERROR_FOLDER_NAME.equals(mFolderName);
    }

    public boolean isRemoteFolder() {
        if (isSearchQuery() || isOutbox() || isErrorFolder()) {
            return false;
        }

        if (!mController.isMoveCapable(mAccount)) {
            // For POP3 accounts only the Inbox is a remote folder.
            return (mFolderName != null && !mFolderName.equals(mAccount.getInboxFolderName()));
        }

        return true;
    }

    public boolean isAccountExpungeCapable() {
        try {
            return (mAccount != null && mAccount.getRemoteStore().isExpungeCapable());
        } catch (Exception e) {
            return false;
        }
    }

    public void onRemoteSearch() {
        // Remote search is useless without the network.
        if (mHasConnectivity) {
            onRemoteSearchRequested();
        } else {
            Toast.makeText(getActivity(), getText(R.string.remote_search_unavailable_no_network),
                    Toast.LENGTH_SHORT).show();
        }
    }

    public boolean isRemoteSearch() {
        return mRemoteSearch;
    }

    public boolean isRemoteSearchAllowed() {
        if (!isSearchQuery() || mRemoteSearch || !mSingleFolderMode) {
            return false;
        }

        boolean allowRemoteSearch = false;
        final Account searchAccount = mAccount;
        if (searchAccount != null) {
            allowRemoteSearch = searchAccount.allowRemoteSearch();
        }

        return allowRemoteSearch;
    }

    public boolean onSearchRequested() {
        String folderName = (mCurrentFolder != null) ? mCurrentFolder.name : null;
        return mFragmentListener.startSearch(mAccount, folderName);
   }

    @Override
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        String accountUuid = mAccountUuids[id];
        Account account = mPreferences.getAccount(accountUuid);

        Uri uri;
        String[] projection;
        if (mThreadedList) {
            uri = Uri.withAppendedPath(EmailProvider.CONTENT_URI, "account/" + accountUuid + "/messages/threaded");
            projection = THREADED_PROJECTION;
        } else {
            uri = Uri.withAppendedPath(EmailProvider.CONTENT_URI, "account/" + accountUuid + "/messages");
            projection = PROJECTION;
        }

        StringBuilder query = new StringBuilder();
        List<String> queryArgs = new ArrayList<String>();
        SqlQueryBuilder.buildWhereClause(account, mSearch.getConditions(), query, queryArgs);

        String selection = query.toString();
        String[] selectionArgs = queryArgs.toArray(new String[0]);

        String sortOrder = buildSortOrder();

        return new CursorLoader(getActivity(), uri, projection, selection, selectionArgs,
                sortOrder);
    }

    private String buildSortOrder() {
        String sortColumn = MessageColumns.ID;
        switch (mSortType) {
            case SORT_ARRIVAL: {
                sortColumn = MessageColumns.INTERNAL_DATE;
                break;
            }
            case SORT_ATTACHMENT: {
                sortColumn = "(" + MessageColumns.ATTACHMENT_COUNT + " < 1)";
                break;
            }
            case SORT_FLAGGED: {
                sortColumn = "(" + MessageColumns.FLAGS + " NOT LIKE '%FLAGGED%')";
                break;
            }
//            case SORT_SENDER: {
//                //FIXME
//                sortColumn = MessageColumns.SENDER_LIST;
//                break;
//            }
            case SORT_SUBJECT: {
                sortColumn = MessageColumns.SUBJECT + " COLLATE NOCASE";
                break;
            }
            case SORT_UNREAD: {
                sortColumn = "(" + MessageColumns.FLAGS + " LIKE '%SEEN%')";
                break;
            }
            case SORT_DATE:
            default: {
                sortColumn = MessageColumns.DATE;
            }
        }

        String sortDirection = (mSortAscending) ? " ASC" : " DESC";
        String secondarySort;
        if (mSortType == SortType.SORT_DATE || mSortType == SortType.SORT_ARRIVAL) {
            secondarySort = "";
        } else {
            secondarySort = MessageColumns.DATE + ((mSortDateAscending) ? " ASC, " : " DESC, ");
        }

        String sortOrder = sortColumn + sortDirection + ", " + secondarySort +
                MessageColumns.ID + " DESC";
        return sortOrder;
    }

    @Override
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        Cursor cursor;
        if (mCursors.length > 1) {
            mCursors[loader.getId()] = data;
            cursor = new MergeCursorWithUniqueId(mCursors, getComparator());
        } else {
            cursor = data;
        }

        mSelected = new SparseBooleanArray(cursor.getCount());
        //TODO: use the (stable) IDs as index and reuse the old mSelected
        mAdapter.swapCursor(cursor);
    }

    @Override
    public void onLoaderReset(Loader<Cursor> loader) {
        mSelected = null;
        mAdapter.swapCursor(null);
    }

    private Account getAccountFromCursor(Cursor cursor) {
        String accountUuid = cursor.getString(ACCOUNT_UUID_COLUMN);
        return mPreferences.getAccount(accountUuid);
    }
}