/*
 * Copyright (c) 2006-2017 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.identd;

import com.dmdirc.config.GlobalConfig;
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.events.ClientPrefsOpenedEvent;
import com.dmdirc.events.ServerConnectErrorEvent;
import com.dmdirc.events.ServerConnectedEvent;
import com.dmdirc.events.ServerConnectingEvent;
import com.dmdirc.interfaces.Connection;
import com.dmdirc.events.eventbus.EventBus;
import com.dmdirc.interfaces.config.AggregateConfigProvider;
import com.dmdirc.plugins.PluginDomain;
import com.dmdirc.plugins.PluginInfo;
import com.dmdirc.util.validators.PortValidator;
import java.util.ArrayList;
import java.util.List;
import javax.inject.Inject;
import net.engio.mbassy.listener.Handler;

public class IdentdManager {

    /** List of all the connections that need ident replies. */
    private final List<Connection> connections;
    /** Global config. */
    private final AggregateConfigProvider config;
    /** This plugin's settings domain. */
    private final String domain;
    /** Ident server. */
    private final IdentdServer server;
    /** Event bus to subscribe to events on. */
    private final EventBus eventBus;
    private final PluginInfo pluginInfo;

    @Inject
    public IdentdManager(@GlobalConfig final AggregateConfigProvider config,
            @PluginDomain(IdentdPlugin.class) final String domain,
            @PluginDomain(IdentdPlugin.class) final PluginInfo pluginInfo,
            final IdentdServer server, final EventBus eventBus) {
        this.pluginInfo = pluginInfo;
        connections = new ArrayList<>();
        this.config = config;
        this.domain = domain;
        this.server = server;
        this.eventBus = eventBus;
    }

    /**
     * Called when the plugin is loaded.
     */
    public void onLoad() {
        eventBus.subscribe(this);

        if (config.getOptionBool(domain, "advanced.alwaysOn")) {
            server.startServer();
        }
    }

    /**
     * Called when this plugin is unloaded.
     */
    public void onUnload() {
        eventBus.unsubscribe(this);
        server.stopServer();
        connections.clear();
    }

    @Handler
    public void handleServerConnecting(final ServerConnectingEvent event) {
        synchronized (connections) {
            if (connections.isEmpty()) {
                server.startServer();
            }
            connections.add(event.getConnection());
        }
    }

    @Handler
    public void handleServerConnected(final ServerConnectedEvent event) {
        handleServerRemoved(event.getConnection());
    }

    @Handler
    public void handleServerConnectError(final ServerConnectErrorEvent event) {
        handleServerRemoved(event.getConnection());
    }

    private void handleServerRemoved(final Connection connection) {
        synchronized (connections) {
            connections.remove(connection);

            if (connections.isEmpty() && !config.getOptionBool(domain, "advanced.alwaysOn")) {
                server.stopServer();
            }
        }
    }

    @Handler
    public void showConfig(final ClientPrefsOpenedEvent event) {
        final PreferencesDialogModel manager = event.getModel();
        final PreferencesCategory general = new PluginPreferencesCategory(
                pluginInfo, "Identd",
                "General Identd Plugin config ('Lower' options take priority "
                        + "over those above them)");
        final PreferencesCategory advanced = new PluginPreferencesCategory(
                pluginInfo, "Advanced",
                "Advanced Identd Plugin config - Only edit these if you need "
                        + "to/know what you are doing. Editing these could prevent "
                        + "access to some servers. ('Lower' options take priority over "
                        + "those above them)");

        general.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "general.useUsername", "Use connection "
                + "username rather than system username", "If this is enabled,"
                + " the username for the connection will be used rather than '"
                + System.getProperty("user.name") + '\'',
                manager.getConfigManager(), manager.getIdentity()));
        general.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "general.useNickname", "Use connection "
                + "nickname rather than system username", "If this is enabled, "
                + "the nickname for the connection will be used rather than '"
                + System.getProperty("user.name") + '\'',
                manager.getConfigManager(), manager.getIdentity()));
        general.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "general.useCustomName", "Use custom name" + " all the time",
                "If this is enabled, the name specified below" + " will be used all the time",
                manager.getConfigManager(),
                manager.getIdentity()));
        general.addSetting(new PreferencesSetting(PreferencesType.TEXT,
                domain, "general.customName", "Custom Name to use",
                "The custom name to use when 'Use Custom Name' is enabled",
                manager.getConfigManager(), manager.getIdentity()));
        advanced.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "advanced.alwaysOn", "Always have ident " + "port open",
                "By default the identd only runs when there are "
                        + "active connection attempts. This overrides that.",
                manager.getConfigManager(), manager.getIdentity()));
        advanced.addSetting(new PreferencesSetting(PreferencesType.INTEGER,
                new PortValidator(), domain, "advanced.port",
                "What port should the identd listen on", "Default port is 113,"
                + " this is probably useless if changed unless you port forward"
                + " ident to a different port", manager.getConfigManager(),
                manager.getIdentity()));
        advanced.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "advanced.useCustomSystem", "Use custom OS",
                "By default the plugin uses 'UNIX' or 'WIN32' as the system "
                        + "type, this can be overridden by enabling this.",
                manager.getConfigManager(), manager.getIdentity()));
        advanced.addSetting(new PreferencesSetting(PreferencesType.TEXT,
                domain, "advanced.customSystem", "Custom OS to use",
                "The custom system to use when 'Use Custom System' is enabled",
                manager.getConfigManager(), manager.getIdentity()));
        advanced.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "advanced.isHiddenUser", "Respond to ident"
                + " requests with HIDDEN-USER error", "By default the plugin will"
                + " give a USERID response, this can force an 'ERROR :"
                + " HIDDEN-USER' response instead.", manager.getConfigManager(),
                manager.getIdentity()));
        advanced.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "advanced.isNoUser", "Respond to ident"
                + " requests with NO-USER error", "By default the plugin will"
                + " give a USERID response, this can force an 'ERROR : NO-USER'"
                + " response instead. (Overrides HIDDEN-USER)",
                manager.getConfigManager(), manager.getIdentity()));

        manager.getCategory("Plugins").addSubCategory(general);
        general.addSubCategory(advanced);
    }

}