/*
 * Copyright (c) 2006-2013 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.dmdirc.addons.relaybot;

import com.dmdirc.Channel;
import com.dmdirc.Server;
import com.dmdirc.actions.ActionManager;
import com.dmdirc.actions.CoreActionType;
import com.dmdirc.addons.ui_swing.UIUtilities;
import com.dmdirc.config.IdentityManager;
import com.dmdirc.config.prefs.PluginPreferencesCategory;
import com.dmdirc.config.prefs.PreferencesCategory;
import com.dmdirc.config.prefs.PreferencesDialogModel;
import com.dmdirc.config.prefs.PreferencesSetting;
import com.dmdirc.config.prefs.PreferencesType;
import com.dmdirc.interfaces.ActionListener;
import com.dmdirc.interfaces.ConfigChangeListener;
import com.dmdirc.interfaces.actions.ActionType;
import com.dmdirc.parser.interfaces.ChannelClientInfo;
import com.dmdirc.parser.interfaces.Parser;
import com.dmdirc.parser.irc.IRCParser;
import com.dmdirc.plugins.BasePlugin;
import com.dmdirc.plugins.PluginInfo;
import com.dmdirc.plugins.PluginManager;

import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;

/**
 * This plugin makes certain relay bots less obnoxious looking.
 */
public class RelayBotPlugin extends BasePlugin implements ActionListener, ConfigChangeListener {

    /** Known RelayChannelHandlers. */
    private final Map<Channel, RelayChannelHandler> handlers = new HashMap<Channel, RelayChannelHandler>();
    /** This plugin's plugin info. */
    private final PluginInfo pluginInfo;

    /**
     * Creates a new instance of this plugin.
     *
     * @param pluginInfo This plugin's plugin info
     */
    public RelayBotPlugin(final PluginInfo pluginInfo) {
        super();
        this.pluginInfo = pluginInfo;
    }

    /** {@inheritDoc} */
    @Override
    public void onLoad() {
        ActionManager.getActionManager().registerListener(this,
                CoreActionType.CHANNEL_OPENED);
        ActionManager.getActionManager().registerListener(this,
                CoreActionType.CHANNEL_CLOSED);
        ActionManager.getActionManager().registerListener(this,
                CoreActionType.SERVER_CONNECTED);
        ActionManager.getActionManager().registerListener(this,
                CoreActionType.SERVER_DISCONNECTED);
        ActionManager.getActionManager().registerListener(this,
                CoreActionType.CHANNEL_QUIT);
        IdentityManager.getIdentityManager().getGlobalConfiguration()
                .addChangeListener(getDomain(), this);

        // Add ourself to all currently known channels that we should be
        // connected with.
        for (Server server : getPluginManager().getMain().getServerManager().getServers()) {
            final Parser parser = server.getParser();
            if (parser instanceof IRCParser && !(parser.getCallbackManager() instanceof RelayCallbackManager)) {
                new RelayCallbackManager(this, (IRCParser) parser);
            }
            for (String channel : server.getChannels()) {
                getHandler(server.getChannel(channel));
            }
        }
    }

    /**
     * Get our plugin manager.
     *
     * @return Our plugin manager.
     */
    protected PluginManager getPluginManager() {
        return pluginInfo.getMetaData().getManager();
    }

    /** {@inheritDoc} */
    @Override
    public void onUnload() {
        ActionManager.getActionManager().unregisterListener(this);

        // Remove RelayCallbackManagers
        for (Server server : getPluginManager().getMain().getServerManager().getServers()) {
            final Parser parser = server.getParser();
            if (parser instanceof IRCParser && parser.getCallbackManager() instanceof RelayCallbackManager) {
                ((RelayCallbackManager) parser.getCallbackManager()).onSocketClosed(parser, new Date());
            }
        }

        // Remove from all channels.
        synchronized (handlers) {
            for (RelayChannelHandler handler : new ArrayList<RelayChannelHandler>(handlers.values())) {
                handler.restoreCoreChannelHandler();
            }
            handlers.clear();
        }
    }

    /**
     * Process an event of the specified type.
     *
     * @param type The type of the event to process
     * @param format Format of messages that are about to be sent. (May be null)
     * @param arguments The arguments for the event
     */
    @Override
    public void processEvent(final ActionType type, final StringBuffer format, final Object... arguments) {
        if (type == CoreActionType.CHANNEL_OPENED) {
            getHandler((Channel) arguments[0]);
        } else if (type == CoreActionType.CHANNEL_CLOSED) {
            removeHandler((Channel) arguments[0]);
        } else if (type == CoreActionType.CHANNEL_QUIT) {
            final Channel chan = (Channel) arguments[0];
            final Parser parser = chan.getServer().getParser();
            final ChannelClientInfo cci = (ChannelClientInfo) arguments[1];
            final String channelName = parser.getStringConverter().toLowerCase(chan.getName());

            if (IdentityManager.getIdentityManager().getGlobalConfiguration().hasOptionString(getDomain(), channelName)) {
                final String botName = IdentityManager.getIdentityManager().getGlobalConfiguration().getOption(getDomain(), channelName);
                if (parser.getStringConverter().equalsIgnoreCase(botName, cci.getClient().getNickname())) {
                    // The bot quit :(
                    final RelayChannelHandler handler = getHandler(chan);
                    if (handler != null) {
                        handler.updateNames();
                    }
                }
            }
        } else if (type == CoreActionType.SERVER_CONNECTED) {
            final Server server = (Server) arguments[0];

            final Parser parser = server.getParser();
            if (parser instanceof IRCParser && !(parser.getCallbackManager() instanceof RelayCallbackManager)) {
                new RelayCallbackManager(this, (IRCParser) parser);
            }
        } else if (type == CoreActionType.SERVER_DISCONNECTED) {
            final Server server = (Server) arguments[0];

            // RelayCallbackManager will revert itself when this happens.

            // Unset any listeners for channels of this server
            for (String channel : server.getChannels()) {
                removeHandler(server.getChannel(channel));
            }
        }
    }

    /** {@inheritDoc} */
    @Override
    public void configChanged(final String domain, final String key) {
        final boolean wasUnset = !IdentityManager.getIdentityManager().getGlobalConfiguration().hasOptionString(domain, key);

        for (Server server : getPluginManager().getMain().getServerManager().getServers()) {
            if (server.hasChannel(key)) {
                final Channel chan = server.getChannel(key);
                if (wasUnset) {
                    removeHandler(chan);
                } else {
                    getHandler(chan);
                }
            }
        }
    }

    /**
     * Do we have an intercept for the given channel object?
     * If we have one, we will return true.
     * If we should have one (as determined by checking the config) we will add
     * one and return true.
     *
     * @param channel Channel to check
     * @return true or false
     */
    public boolean isListening(final Channel channel) {
        return (getHandler(channel) != null);
    }

    /**
     * Get the RelayChannelHandler for a given Channel.
     * If we have one, we will return it.
     * If we should have one (as determined by checking the config) we will
     * create and return it.
     * Otherwise we will return null.
     *
     * @param channel Channel to get Handler for.
     * @return ChannelHandler or null
     */
    public RelayChannelHandler getHandler(final Channel channel) {
        synchronized (handlers) {
            if (handlers.containsKey(channel)) {
                return handlers.get(channel);
            } else {
                final String channelName = channel.getServer().getParser().getStringConverter().toLowerCase(channel.getName());
                if (IdentityManager.getIdentityManager().getGlobalConfiguration().hasOptionString(getDomain(), channelName)) {
                    final RelayChannelHandler handler = new RelayChannelHandler(this, channel);
                    handlers.put(channel, handler);
                    return handler;
                }
            }
        }

        return null;
    }

    /**
     * Remove the RelayChannelHandler for a given Channel.
     * If we have one already, we will return it and remove it.
     * Otherwise we will return null.
     *
     * @param channel Channel to remove Handler for.
     * @return Handler that we removed, or null.
     */
    public RelayChannelHandler removeHandler(final Channel channel) {
        synchronized (handlers) {
            if (handlers.containsKey(channel)) {
                final RelayChannelHandler handler = handlers.get(channel);
                handler.unset();
                handlers.remove(channel);

                return handler;
            }
        }

        return null;
    }

    /**
     * Reads the relay bot channel data from the config.
     *
     * @return A multi-dimensional array of channel data.
     */
    public String[][] getData() {
        final Map<String, String> settings
                = IdentityManager.getIdentityManager().getGlobalConfiguration()
                .getOptions(getDomain());
        int i = 0;
        for (Map.Entry<String, String> entry : settings.entrySet()) {
            if (entry.getKey().charAt(0) == '#') {
                i++;
            }
        }
        final String[][] data = new String[i][2];
        i = 0;
        for (Map.Entry<String, String> entry : settings.entrySet()) {
            if (entry.getKey().charAt(0) == '#') {
                data[i] = new String[]{entry.getKey(), entry.getValue(), };
                i++;
            }
        }
        return data;
    }

    /** {@inheritDoc} */
    @Override
    public void showConfig(final PreferencesDialogModel manager) {
        final PreferencesCategory general = new PluginPreferencesCategory(
                pluginInfo, "Relay Bot",
                "General configuration for the Relay bot plugin.");

        final PreferencesCategory colours = new PluginPreferencesCategory(
                pluginInfo, "Channels",
                "Identifies where and who the bot is in channels.",
                UIUtilities.invokeAndWait(
                new Callable<RelayChannelPanel>() {

            /** {@inheritDoc} */
            @Override
            public RelayChannelPanel call() {
                return new RelayChannelPanel(getPluginManager()
                        .getPluginInfoByName("ui_swing").getPlugin(),
                        RelayBotPlugin.this);
            }
        }));
        colours.setInline().setInlineAfter();
        general.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                getDomain(), "joinOnDiscover", "Join on discover",
                "Do you want fake clients to join the channel?",
                manager.getConfigManager(), manager.getIdentity()));
        general.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                getDomain(), "colourFullName", "Colour full name",
                "Do you want to colour the full name?",
                manager.getConfigManager(), manager.getIdentity()));
        manager.getCategory("Plugins").addSubCategory(general);
        general.addSubCategory(colours);
    }
}