/*
 * 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.channelwho;

import com.dmdirc.config.prefs.PreferencesCategory;
import com.dmdirc.config.prefs.PreferencesSetting;
import com.dmdirc.config.prefs.PreferencesType;
import com.dmdirc.events.ClientPrefsOpenedEvent;
import com.dmdirc.events.GroupChatPrefsRequestedEvent;
import com.dmdirc.events.ServerConnectingEvent;
import com.dmdirc.events.ServerDisconnectedEvent;
import com.dmdirc.interfaces.Connection;
import com.dmdirc.interfaces.ConnectionManager;
import com.dmdirc.events.eventbus.EventBus;
import com.dmdirc.plugins.PluginDomain;
import com.dmdirc.util.validators.NumericalValidator;

import com.google.common.annotations.VisibleForTesting;

import java.util.HashMap;
import java.util.Map;

import javax.inject.Inject;

import net.engio.mbassy.listener.Handler;

/**
 * Provides channel who support in DMDirc.
 */
public class ChannelWhoManager {

    private final String domain;
    private final ConnectionHandlerFactory connectionHandlerFactory;
    private final ConnectionManager connectionManager;
    private final EventBus eventBus;
    private final Map<Connection, ConnectionHandler> connectionHandlers;

    @Inject
    public ChannelWhoManager(
            @PluginDomain(ChannelWhoPlugin.class) final String domain,
            final ConnectionHandlerFactory connectionHandlerFactory,
            final ConnectionManager connectionManager,
            final EventBus eventBus) {
        this.domain = domain;
        this.connectionHandlerFactory = connectionHandlerFactory;
        this.connectionManager = connectionManager;
        this.eventBus = eventBus;
        connectionHandlers = new HashMap<>();
    }

    public void load() {
        eventBus.subscribe(this);
        connectionManager.getConnections().forEach(this::addConnectionHandler);
    }

    public void unload() {
        connectionManager.getConnections().forEach(this::removeConnectionHandler);
        eventBus.unsubscribe(this);
    }

    private void addConnectionHandler(final Connection connection) {
        connectionHandlers.computeIfAbsent(connection, connectionHandlerFactory::get);
    }

    private void removeConnectionHandler(final Connection connection) {
        final ConnectionHandler connectionHandler = connectionHandlers.remove(connection);
        if (connectionHandler != null) {
            connectionHandler.unload();
        }
    }

    @VisibleForTesting
    @Handler
    void handleGroupChatPrefsRequestedEvent(final GroupChatPrefsRequestedEvent event) {
        event.getCategory().addSetting(new PreferencesSetting(PreferencesType.BOOLEAN, domain,
                "sendwho", "Send Who Requests", "Should we send who requests to the channel?",
                event.getConfig(), event.getIdentity()));
    }

    @VisibleForTesting
    @Handler
    void handlePrefsDialog(final ClientPrefsOpenedEvent event) {
        final PreferencesCategory category = new PreferencesCategory("Channel Who", "Provides " +
                "support for sending WHO requests to channels at regular intervals");
        category.addSetting(new PreferencesSetting(PreferencesType.DURATION,
                new NumericalValidator(0, Integer.MAX_VALUE), domain, "whointerval",
                "Who Interval", "The interval WHO requests will be sent to channels",
                event.getModel().getConfigManager(), event.getModel().getIdentity()));
        event.getModel().getCategory("Plugins").addSubCategory(category);
    }

    @VisibleForTesting
    @Handler
    void handleServerConnectingEvent(final ServerConnectingEvent event) {
        addConnectionHandler(event.getConnection());
    }

    @VisibleForTesting
    @Handler
    void handleServerDisconnectedEvent(final ServerDisconnectedEvent event) {
        removeConnectionHandler(event.getConnection());
    }

}