/*
Yaaic - Yet Another Android IRC Client

Copyright 2009-2013 Sebastian Kaspari

This file is part of Yaaic.

Yaaic is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Yaaic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with Yaaic.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.yaaic.model;

import java.util.LinkedList;

/**
 * Base class for conversations
 * 
 * A conversation can be a channel, a query or server messages
 * 
 * @author Sebastian Kaspari <sebastian@yaaic.org>
 */
public abstract class Conversation
{
    public static final int TYPE_CHANNEL = 1;
    public static final int TYPE_QUERY   = 2;
    public static final int TYPE_SERVER  = 3;

    public static final int STATUS_DEFAULT   = 1;
    public static final int STATUS_SELECTED  = 2;
    public static final int STATUS_MESSAGE   = 3;
    public static final int STATUS_HIGHLIGHT = 4;
    public static final int STATUS_MISC      = 5; // join/part/quit

    private static final int DEFAULT_HISTORY_SIZE = 30;

    private final LinkedList<Message> buffer;
    private final LinkedList<Message> history;
    private final String name;
    private int status = 1;
    private int newMentions = 0;
    private int historySize = DEFAULT_HISTORY_SIZE;

    /**
     * Get the type of conversation (channel, query, ..)
     * 
     * @return See the constants: Conversation.TYPE_*
     */
    public abstract int getType();

    /**
     * Create a new conversation with the given name
     * 
     * @param name The name of the conversation (channel, user)
     */
    public Conversation(String name)
    {
        this.buffer = new LinkedList<Message>();
        this.history = new LinkedList<Message>();
        this.name = name.toLowerCase();
    }

    /**
     * Get name of the conversation (channel, user)
     */
    public String getName()
    {
        return name;
    }

    /**
     * Add a message to the channel
     */
    public void addMessage(Message message)
    {
        buffer.add(0, message);
        history.add(message);

        if (history.size() > historySize) {
            history.remove(0);
        }
    }

    /**
     * Get the history
     */
    public LinkedList<Message> getHistory()
    {
        return history;
    }

    /**
     * Get message of the history at the given position
     * 
     * @param position
     * @return The message at the given position
     */
    public Message getHistoryMessage(int position)
    {
        return history.get(position);
    }

    /**
     * Get last buffered message
     * 
     * @return
     */
    public Message pollBufferedMessage()
    {
        Message message = buffer.get(buffer.size() - 1);
        buffer.remove(buffer.size() - 1);
        return message;
    }

    /**
     * Get the buffer
     * 
     * @return
     */
    public LinkedList<Message> getBuffer()
    {
        return buffer;
    }

    /**
     * Does the channel have buffered messages?
     */
    public boolean hasBufferedMessages()
    {
        return buffer.size() > 0;
    }

    /**
     * Clear the message buffer
     */
    public void clearBuffer()
    {
        buffer.clear();
    }

    /**
     * Set status of conversation
     * 
     * @param status
     */
    public void setStatus(int status)
    {
        // Selected status can only be changed by deselecting
        if (this.status == STATUS_SELECTED && status != STATUS_DEFAULT) {
            return;
        }

        // Highlight status can only be changed by selecting
        if (this.status == STATUS_HIGHLIGHT && status != STATUS_SELECTED) {
            return;
        }

        // Misc cannot change any other than default
        if (this.status != STATUS_DEFAULT && status == STATUS_MISC) {
            return;
        }

        this.status = status;
    }

    /**
     * Get status of conversation
     * 
     * @return
     */
    public int getStatus()
    {
        return status;
    }

    /**
     * Increment the count of unread mentions in this conversation
     */
    public void addNewMention()
    {
        ++newMentions;
    }

    /**
     * Mark all new mentions as unread
     */
    public void clearNewMentions()
    {
        newMentions = 0;
    }

    /**
     * Get the number of unread mentions in this conversation
     */
    public int getNewMentions()
    {
        return newMentions;
    }

    /**
     * Get this conversation's history size.
     *
     * @return The conversation's history size.
     */
    public int getHistorySize()
    {
        return historySize;
    }

    /**
     * Set this conversation's history size.
     *
     * @param size The new history size for this conversation.
     */
    public void setHistorySize(int size)
    {
        if (size <= 0) {
            return;
        }

        historySize = size;
        if (history.size() > size) {
            history.subList(size, history.size()).clear();
        }
    }
}