/*
 * 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.qauth;

import com.dmdirc.Invite;
import com.dmdirc.config.ConfigBinder;
import com.dmdirc.config.ConfigBinding;
import com.dmdirc.config.GlobalConfig;
import com.dmdirc.config.prefs.PluginPreferencesCategory;
import com.dmdirc.config.prefs.PreferencesSetting;
import com.dmdirc.config.prefs.PreferencesType;
import com.dmdirc.events.ClientPrefsOpenedEvent;
import com.dmdirc.events.QueryMessageEvent;
import com.dmdirc.events.ServerConnectedEvent;
import com.dmdirc.events.ServerInviteReceivedEvent;
import com.dmdirc.events.ServerNoticeEvent;
import com.dmdirc.events.UserInfoResponseEvent;
import com.dmdirc.interfaces.Connection;
import com.dmdirc.events.eventbus.EventBus;
import com.dmdirc.interfaces.User;
import com.dmdirc.interfaces.config.AggregateConfigProvider;
import com.dmdirc.parser.events.UserInfoEvent;
import com.dmdirc.plugins.PluginDomain;
import com.dmdirc.plugins.PluginInfo;
import com.dmdirc.util.validators.NotEmptyValidator;
import java.util.Optional;
import javax.inject.Inject;
import net.engio.mbassy.listener.Handler;

/**
 * Provides Q AUth support in DMDirc.
 */
public class QAuthManager {

    private final String domain;
    private final PluginInfo pluginInfo;
    private final EventBus eventBus;
    private final ConfigBinder configBinder;
    private String username;
    private String password;
    private boolean whois;
    private boolean autoInvite;
    private boolean acceptInvites;
    private boolean waitingWhois;

    @Inject
    public QAuthManager(
            @PluginDomain(QAuthPlugin.class) final String domain,
            @PluginDomain(QAuthPlugin.class) final PluginInfo pluginInfo,
            @GlobalConfig final AggregateConfigProvider config,
            final EventBus eventBus) {
        this.domain = domain;
        this.pluginInfo = pluginInfo;
        this.eventBus = eventBus;
        configBinder = config.getBinder().withDefaultDomain(domain);
    }

    public void load() {
        configBinder.bind(this, QAuthManager.class);
        eventBus.subscribe(this);
    }

    public void unload() {
        configBinder.unbind(this);
        eventBus.unsubscribe(this);
    }

    private boolean isValidConnection(final Connection connection) {
        return "Quakenet".equalsIgnoreCase(connection.getNetwork());
    }

    private boolean isValidUser(final User user) {
        // TODO: Check hostname?
        return "Q".equalsIgnoreCase(user.getNickname());
    }

    private void acceptInvite(final Invite invite) {
        invite.accept();
    }

    private void requestInvites(final Connection connection) {
        connection.sendMessage("Q@Cserve.quakenet.org", "invite");
    }

    private void auth(final Connection connection) {
        connection.sendMessage("Q@Cserve.quakenet.org", "auth " + username + ' ' + password);
    }

    private void sendWhois(final Connection connection) {
        connection.getLocalUser().ifPresent(u -> {
            connection.requestUserInfo(u);
            waitingWhois = true;
        });
    }

    @Handler
    void handleConnect(final ServerConnectedEvent event) {
        if (!isValidConnection(event.getConnection())) {
            return;
        }
        if (whois) {
            sendWhois(event.getConnection());
        } else {
            auth(event.getConnection());
        }
    }

    @Handler
    void handleUserInfoResponse(final UserInfoResponseEvent event) {
        if (!waitingWhois) {
            return;
        }
        event.getConnection().getLocalUser().ifPresent(u -> {
            if (u.equals(event.getUser())) {
                if (!event.getInfo(UserInfoEvent.UserInfoType.ACCOUNT_NAME).isPresent()) {
                    auth(event.getConnection());
                }
                waitingWhois = false;
            }
        });
    }

    @Handler
    void handleInvite(final ServerInviteReceivedEvent event) {
        if (!acceptInvites) {
            return;
        }
        if (isValidConnection(event.getConnection()) && isValidUser(event.getUser())) {
            acceptInvite(event.getInvite());
        }
    }

    @Handler
    void handleNotices(final ServerNoticeEvent event) {
        handleCommunication(Optional.of(event.getConnection()), event.getUser(), event.getMessage());
    }

    @Handler
    void handleMessages(final QueryMessageEvent event) {
        handleCommunication(event.getQuery().getConnection(), event.getUser(), event.getMessage());
    }

    private void handleCommunication(final Optional<Connection> connection, final User user,
            final String message) {
        connection.ifPresent(c -> {
            if (isValidConnection(c) && isValidUser(user) &&
                    ("You are now logged in as " + username + '.').equalsIgnoreCase(message)) {
                if (autoInvite) {
                    requestInvites(c);
                }
            }
        });
    }

    @ConfigBinding(key = "username")
    void handleUsername(final String value) {
        username = value;
    }

    @ConfigBinding(key = "password")
    void handlePassword(final String value) {
        password = value;
    }

    @ConfigBinding(key = "whois")
    void handleWhois(final boolean value) {
        whois = value;
    }

    @ConfigBinding(key = "autoinvite")
    void handleAutoInvite(final boolean value) {
        autoInvite = value;
    }

    @ConfigBinding(key = "acceptinvites")
    void handleAcceptInvites(final boolean value) {
        acceptInvites = value;
    }

    @Handler
    void showConfig(final ClientPrefsOpenedEvent event) {
        final PluginPreferencesCategory category = new PluginPreferencesCategory(pluginInfo,
                "Q Auth", "Q Authentication settings");
        category.addSetting(new PreferencesSetting(PreferencesType.TEXT, new NotEmptyValidator(),
                domain, "username", "Username", "Your Q username",
                event.getModel().getConfigManager(), event.getModel().getIdentity()));
        category.addSetting(new PreferencesSetting(PreferencesType.TEXT, new NotEmptyValidator(),
                domain, "password", "Password", "Your Q password",
                event.getModel().getConfigManager(), event.getModel().getIdentity()));
        category.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "whois", "Whois before auth",
                "Should we send a whois before authing and only auth if required?",
                event.getModel().getConfigManager(), event.getModel().getIdentity()));
        category.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "autoinvite", "Auto Invite", "Should Q autoinvite you to channels?",
                event.getModel().getConfigManager(), event.getModel().getIdentity()));
        category.addSetting(new PreferencesSetting(PreferencesType.BOOLEAN,
                domain, "acceptinvites", "Auto Accept Invites",
                "Should the client automatically accept invites from Q?",
                event.getModel().getConfigManager(), event.getModel().getIdentity()));
        event.getModel().getCategory("Plugins").addSubCategory(category);
    }
}