mail/src/js/controller/mail-list.js

define(function(require) {
    'use strict';

    var angular = require('angular'),
        _ = require('underscore'),
        appController = require('js/app-controller'),
        notification = require('js/util/notification'),
        emailDao, outboxBo, keychainDao, searchTimeout, firstSelect;

    var INIT_DISPLAY_LEN = 20,
        SCROLL_DISPLAY_LEN = 10,
        FOLDER_TYPE_INBOX = 'Inbox';

    var MailListCtrl = function($scope, $routeParams) {
        //
        // Init
        //

        emailDao = appController._emailDao;
        outboxBo = appController._outboxBo;
        keychainDao = appController._keychain;

        /**
         * Gathers unread notifications to be cancelled later
         */
        $scope.pendingNotifications = [];

        //
        // scope functions
        //

        $scope.getBody = function(email) {
            emailDao.getBody({
                folder: currentFolder(),
                message: email
            }, function(err) {
                if (err && err.code !== 42) {
                    $scope.onError(err);
                    return;
                }

                // display fetched body
                $scope.$digest();

                // automatically decrypt if it's the selected email
                if (email === currentMessage()) {
                    emailDao.decryptBody({
                        message: email
                    }, $scope.onError);
                }
            });
        };

        /**
         * Called when clicking on an email list item
         */
        $scope.select = function(email) {
            // unselect an item
            if (!email) {
                $scope.state.mailList.selected = undefined;
                return;
            }

            $scope.state.mailList.selected = email;

            if (!firstSelect) {
                // only toggle to read view on 2nd select in mobile mode
                $scope.state.read.toggle(true);
            }
            firstSelect = false;

            keychainDao.refreshKeyForUserId(email.from[0].address, onKeyRefreshed);

            function onKeyRefreshed(err) {
                if (err) {
                    $scope.onError(err);
                }

                emailDao.decryptBody({
                    message: email
                }, $scope.onError);

                // if the email is unread, please sync the new state.
                // otherweise forget about it.
                if (!email.unread) {
                    return;
                }

                // let's close pending notifications for unread messages in the inbox
                if (currentFolder().type === FOLDER_TYPE_INBOX) {
                    while ($scope.pendingNotifications.length) {
                        notification.close($scope.pendingNotifications.shift());
                    }
                }

                $scope.toggleUnread(email);
            }
        };

        /**
         * Mark an email as unread or read, respectively
         */
        $scope.toggleUnread = function(message) {
            updateStatus('Updating unread flag...');

            message.unread = !message.unread;
            emailDao.setFlags({
                folder: currentFolder(),
                message: message
            }, function(err) {
                if (err && err.code === 42) {
                    // offline, restore
                    message.unread = !message.unread;
                    updateStatus('Unable to mark unread flag in offline mode!');
                    return;
                }

                if (err) {
                    updateStatus('Error on sync!');
                    $scope.onError(err);
                    return;
                }

                updateStatus('Online');
                $scope.$apply();
            });
        };

        /**
         * Delete a message
         */
        $scope.remove = function(message) {
            if (!message) {
                return;
            }

            updateStatus('Deleting message...');
            remove();

            function remove() {
                emailDao.deleteMessage({
                    folder: currentFolder(),
                    message: message
                }, function(err) {
                    if (err) {
                        // show errors where appropriate
                        if (err.code === 42) {
                            $scope.select(message);
                            updateStatus('Unable to delete message in offline mode!');
                            return;
                        }
                        updateStatus('Error during delete!');
                        $scope.onError(err);
                    }
                    updateStatus('Message deleted!');
                    $scope.$apply();
                });
            }
        };

        // share local scope functions with root state
        $scope.state.mailList = {
            remove: $scope.remove
        };

        //
        // watch tasks
        //

        /**
         * List emails from folder when user changes folder
         */
        $scope._stopWatchTask = $scope.$watch('state.nav.currentFolder', function() {
            if (!currentFolder()) {
                return;
            }

            // reset searchFilter
            $scope.searchText = undefined;

            // in development, display dummy mail objects
            if ($routeParams.dev) {
                updateStatus('Last update: ', new Date());
                currentFolder().messages = createDummyMails();
                return;
            }

            // display and select first
            openCurrentFolder();
        });

        $scope.watchMessages = $scope.$watchCollection('state.nav.currentFolder.messages', function(messages) {
            if (!messages) {
                return;
            }

            // sort message by uid
            currentFolder().messages.sort(byUidDescending);
            // set display buffer to first messages
            $scope.displayMessages = currentFolder().messages.slice(0, INIT_DISPLAY_LEN);

            // Shows the next message based on the uid of the currently selected element
            if (currentFolder().messages.indexOf(currentMessage()) === -1) {
                firstSelect = true; // reset first selection
                $scope.select($scope.displayMessages[0]);
            }
        });

        /**
         * display more items (for infinite scrolling)
         */
        $scope.displayMore = function() {
            if (!currentFolder() || !$scope.displayMessages) {
                // folders not yet initialized
                return;
            }

            var len = currentFolder().messages.length,
                dLen = $scope.displayMessages.length;

            if (dLen === len || $scope.searchText) {
                // all messages are already displayed or we're in search mode
                return;
            }

            // copy next interval of messages to the end of the display messages array
            var next = currentFolder().messages.slice(dLen, dLen + SCROLL_DISPLAY_LEN);
            Array.prototype.push.apply($scope.displayMessages, next);
        };

        /**
         * This method is called when the user changes the searchText
         */
        $scope.displaySearchResults = function(searchText) {
            if (searchTimeout) {
                // remove timeout to wait for user typing query
                clearTimeout(searchTimeout);
            }

            if (!searchText) {
                // set display buffer to first messages
                $scope.displayMessages = currentFolder().messages.slice(0, INIT_DISPLAY_LEN);
                $scope.searching = false;
                updateStatus('Online');
                return;
            }

            // display searching spinner
            $scope.searching = true;
            updateStatus('Searching ...');
            searchTimeout = setTimeout(function() {
                $scope.$apply(function() {
                    // filter relevant messages
                    $scope.displayMessages = $scope.search(currentFolder().messages, searchText);
                    $scope.searching = false;
                    updateStatus('Matches in this folder');
                });
            }, 500);
        };

        /**
         * Do full text search on messages. Parse meta data first
         */
        $scope.search = function(messages, searchText) {
            // don't filter on empty searchText
            if (!searchText) {
                return messages;
            }

            // escape search string
            searchText = searchText.replace(/([.*+?^${}()|\[\]\/\\])/g, "\\$1");
            // compare all strings (case insensitive)
            var regex = new RegExp(searchText, 'i');

            function contains(input) {
                if (!input) {
                    return false;
                }
                return regex.test(input);
            }

            function checkAddresses(header) {
                if (!header || !header.length) {
                    return false;
                }

                for (var i = 0; i < header.length; i++) {
                    if (contains(header[i].name) || contains(header[i].address)) {
                        return true;
                    }
                }

                return false;
            }

            /**
             * Filter meta data first and then only look at plaintext and decrypted message bodies
             */
            function matchMetaDataFirst(m) {
                // compare subject
                if (contains(m.subject)) {
                    return true;
                }
                // compares address headers
                if (checkAddresses(m.from) || checkAddresses(m.to) || checkAddresses(m.cc) || checkAddresses(m.bcc)) {
                    return true;
                }
                // compare plaintext body
                if (m.body && !m.encrypted && contains(m.body)) {
                    return true;
                }
                // compare decrypted body
                if (m.body && m.encrypted && m.decrypted && contains(m.body)) {
                    return true;
                }
                // compare plaintex html body
                if (m.html && !m.encrypted && contains(m.html)) {
                    return true;
                }
                // compare decrypted html body
                if (m.html && m.encrypted && m.decrypted && contains(m.html)) {
                    return true;
                }
                return false;
            }

            // user native js Array.filter
            return messages.filter(matchMetaDataFirst);
        };

        /**
         * Sync current folder when client comes back online
         */
        $scope.watchOnline = $scope.$watch('account.online', function(isOnline) {
            if (isOnline) {
                updateStatus('Online');
                openCurrentFolder();
            } else {
                updateStatus('Offline mode');
            }
        }, true);

        //
        // Helper Functions
        //

        function openCurrentFolder() {
            emailDao.openFolder({
                folder: currentFolder()
            }, function(error) {
                // dont wait until scroll to load visible mail bodies
                $scope.loadVisibleBodies();

                // don't display error for offline case
                if (error && error.code === 42) {
                    return;
                }
                $scope.onError(error);
            });
        }

        function updateStatus(lbl, time) {
            $scope.lastUpdateLbl = lbl;
            $scope.lastUpdate = (time) ? time : '';
        }

        function currentFolder() {
            return $scope.state.nav.currentFolder;
        }

        function currentMessage() {
            return $scope.state.mailList.selected;
        }

        //
        // Notification API
        //

        (emailDao || {}).onIncomingMessage = function(msgs) {
            var note, title, message, unreadMsgs;

            unreadMsgs = msgs.filter(function(msg) {
                return msg.unread;
            });

            if (unreadMsgs.length === 0) {
                return;
            }

            if (unreadMsgs.length === 1) {
                title = unreadMsgs[0].from[0].name || unreadMsgs[0].from[0].address;
                message = unreadMsgs[0].subject;
            } else {
                title = unreadMsgs.length + ' new messages';
                message = _.pluck(unreadMsgs, 'subject').join('\n');
            }

            note = notification.create({
                title: title,
                message: message,
                onClick: function() {
                    // force toggle into read mode when notification is clicked
                    firstSelect = false;

                    // remove from pending notificatiosn
                    var index = $scope.pendingNotifications.indexOf(note);
                    if (index !== -1) {
                        $scope.pendingNotifications.splice(index, 1);
                    }

                    // mark message as read
                    $scope.select(_.findWhere(currentFolder().messages, {
                        uid: unreadMsgs[0].uid
                    }));
                }
            });
            $scope.pendingNotifications.push(note);
        };
    };

    //
    // Directives
    //

    var ngModule = angular.module('mail-list', []);

    ngModule.directive('woTouch', function($parse) {
        return function(scope, elm, attrs) {
            var handler = $parse(attrs.woTouch);

            elm.on('touchstart', function() {
                elm.addClass('active');
            });
            elm.on('touchleave touchcancel touchmove touchend', function() {
                elm.removeClass('active');
            });

            elm.on('click', function(event) {
                elm.removeClass('active');
                scope.$apply(function() {
                    handler(scope, {
                        $event: event
                    });
                });
            });
        };
    });

    ngModule.directive('listScroll', function() {
        return {
            link: function(scope, elm, attrs) {
                var model = attrs.listScroll,
                    listEl = elm[0],
                    scrollTimeout;

                /*
                 * iterates over the mails in the mail list and loads their bodies if they are visible in the viewport
                 */
                scope.loadVisibleBodies = function() {
                    var listBorder = listEl.getBoundingClientRect(),
                        top = listBorder.top,
                        bottom = listBorder.bottom,
                        listItems = listEl.children[0].children,
                        inViewport = false,
                        listItem, message,
                        isPartiallyVisibleTop, isPartiallyVisibleBottom, isVisible,
                        displayMessages = scope[model];

                    if (!top && !bottom) {
                        // list not visible
                        return;
                    }

                    for (var i = 0, len = listItems.length; i < len; i++) {
                        // the n-th list item (the dom representation of an email) corresponds to
                        // the n-th message model in the filteredMessages array
                        listItem = listItems.item(i).getBoundingClientRect();

                        if (!displayMessages || displayMessages.length <= i) {
                            // stop if i get larger than the size of filtered messages
                            break;
                        }
                        message = displayMessages[i];


                        isPartiallyVisibleTop = listItem.top < top && listItem.bottom > top; // a portion of the list item is visible on the top
                        isPartiallyVisibleBottom = listItem.top < bottom && listItem.bottom > bottom; // a portion of the list item is visible on the bottom
                        isVisible = (listItem.top || listItem.bottom) && listItem.top >= top && listItem.bottom <= bottom; // the list item is visible as a whole

                        if (isPartiallyVisibleTop || isVisible || isPartiallyVisibleBottom) {
                            // we are now iterating over visible elements
                            inViewport = true;
                            // load mail body of visible
                            scope.getBody(message);
                        } else if (inViewport) {
                            // we are leaving the viewport, so stop iterating over the items
                            break;
                        }
                    }
                };

                // load body when scrolling
                listEl.onscroll = function() {
                    if (scrollTimeout) {
                        // remove timeout so that only scroll end
                        clearTimeout(scrollTimeout);
                    }
                    scrollTimeout = setTimeout(function() {
                        scope.loadVisibleBodies();
                    }, 300);
                };

                // load the visible message bodies, when the list is re-initialized and when scrolling stopped
                scope.$watchCollection(model, function() {
                    scope.loadVisibleBodies();
                });
            }
        };
    });

    function byUidDescending(a, b) {
        if (a.uid < b.uid) {
            return 1;
        } else if (b.uid < a.uid) {
            return -1;
        } else {
            return 0;
        }
    }

    // Helper for development mode

    function createDummyMails() {
        var uid = 1000000;

        var Email = function(unread, attachments, answered) {
            this.uid = uid--;
            this.from = [{
                name: 'Whiteout Support',
                address: 'support@whiteout.io'
            }]; // sender address
            this.to = [{
                address: 'max.musterman@gmail.com'
            }, {
                address: 'max.musterman@gmail.com'
            }]; // list of receivers
            this.cc = [{
                address: 'john.doe@gmail.com'
            }]; // list of receivers
            this.attachments = attachments ? [{
                "filename": "a.md",
                "filesize": 123,
                "mimeType": "text/x-markdown",
                "part": "2",
                "content": null
            }, {
                "filename": "b.md",
                "filesize": 456,
                "mimeType": "text/x-markdown",
                "part": "3",
                "content": null
            }, {
                "filename": "c.md",
                "filesize": 789,
                "mimeType": "text/x-markdown",
                "part": "4",
                "content": null
            }] : [];
            this.unread = unread;
            this.answered = answered;
            this.sentDate = new Date('Thu Sep 19 2013 20:41:23 GMT+0200 (CEST)');
            this.subject = 'Getting started'; // Subject line
            // this.body = 'And a good day to you too sir. \n' +
            //     '\n' +
            //     'Thursday, Apr 24, 2014 3:33 PM safewithme.testuser@gmail.com wrote:\n' +
            //     '> adsfadfasdfasdfasfdasdfasdfas\n' +
            //     '\n' +
            //     'http://example.com\n' +
            //     '\n' +
            //     '> Tuesday, Mar 25, 2014 4:19 PM gianniarcore@gmail.com wrote:\n' +
            //     '>> from 0.7.0.1\n' +
            //     '>>\n' +
            //     '>> God speed!'; // plaintext body
            this.html = '<!DOCTYPE html><html><head></head><body><h1 style="border: 1px solid red; width: 500px;">Hello there' + Math.random() + '</h1></body></html>';
            this.encrypted = true;
            this.decrypted = true;
        };

        var dummies = [],
            i = 100;
        while (i--) {
            // every second/third/fourth dummy mail with unread/attachments/answered
            dummies.push(new Email((i % 2 === 0), (i % 3 === 0), (i % 5 === 0)));
        }

        return dummies;
    }

    return MailListCtrl;
});