/*
 * 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;

import com.dmdirc.actions.ActionGroup;
import com.dmdirc.actions.ActionManager;
import com.dmdirc.actions.wrappers.AliasWrapper;
import com.dmdirc.actions.wrappers.PerformWrapper;
import com.dmdirc.commandline.CommandLineOptionsModule;
import com.dmdirc.commandline.CommandLineOptionsModule.Directory;
import com.dmdirc.commandline.CommandLineOptionsModule.DirectoryType;
import com.dmdirc.commandline.CommandLineParser;
import com.dmdirc.commandparser.CommandLoader;
import com.dmdirc.commandparser.CommandManager;
import com.dmdirc.config.ConfigManager;
import com.dmdirc.config.IdentityManager;
import com.dmdirc.config.InvalidIdentityFileException;
import com.dmdirc.interfaces.ActionController;
import com.dmdirc.interfaces.CommandController;
import com.dmdirc.interfaces.IdentityController;
import com.dmdirc.interfaces.LifecycleController;
import com.dmdirc.logger.ErrorLevel;
import com.dmdirc.logger.Logger;
import com.dmdirc.messages.MessageSinkManager;
import com.dmdirc.plugins.PluginInfo;
import com.dmdirc.plugins.PluginManager;
import com.dmdirc.ui.WarningDialog;
import com.dmdirc.ui.core.components.StatusBarManager;
import com.dmdirc.ui.messages.ColourManager;
import com.dmdirc.ui.themes.ThemeManager;
import com.dmdirc.updater.UpdateChecker;
import com.dmdirc.updater.Version;
import com.dmdirc.updater.components.LauncherComponent;
import com.dmdirc.updater.manager.UpdateManager;

import java.awt.GraphicsEnvironment;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Set;

import javax.inject.Provider;
import javax.inject.Singleton;

import dagger.Module;
import dagger.Provides;

/**
 * Provides dependencies for the client.
 */
@Module(injects = {Main.class, CommandLineParser.class}, includes = CommandLineOptionsModule.class)
public class ClientModule {

    /**
     * Provides an identity manager for the client.
     *
     * @param directory The directory to load settings from.
     * @param commandLineParser The CLI parser to read command line settings from.
     * @return An initialised {@link IdentityManager}.
     */
    @Provides
    @Singleton
    public IdentityManager getIdentityManager(
            @Directory(DirectoryType.BASE) final String directory,
            final CommandLineParser commandLineParser) {
        final IdentityManager identityManager = new IdentityManager(directory);
        IdentityManager.setIdentityManager(identityManager);
        identityManager.loadVersionIdentity();

        try {
            identityManager.initialise();
        } catch (InvalidIdentityFileException ex) {
            handleInvalidConfigFile(identityManager, directory);
        }

        if (commandLineParser.getDisableReporting()) {
            identityManager.getGlobalConfigIdentity()
                    .setOption("temp", "noerrorreporting", true);
        }

        return identityManager;
    }

    /**
     * Provides an identity controller.
     *
     * @param manager The identity manager to use as a controller.
     * @return An identity controller to use.
     */
    @Provides
    public IdentityController getIdentityController(final IdentityManager manager) {
        return manager;
    }

    /**
     * Provides a parser factory.
     *
     * @param pluginManager The plugin manager to use to find parsers.
     * @return A parser factory for use in the client.
     */
    @Provides
    public ParserFactory getParserFactory(final PluginManager pluginManager) {
        return new ParserFactory(pluginManager);
    }

    /**
     * Provides an action manager.
     *
     * @param serverManager The server manager to use to iterate servers.
     * @param identityController The identity controller to use to look up settings.
     * @param aliasWrapperProvider Provider for {@link AliasWrapper}s.
     * @param performWrapperProvider Provider for {@link PerformWrapper}s.
     * @return An unitialised action manager.
     */
    @Provides
    @Singleton
    public ActionManager getActionManager(
            final ServerManager serverManager,
            final IdentityController identityController,
            final Provider<Set<ActionGroup>> actionWrappersProvider) {
        final ActionManager actionManager = new ActionManager(serverManager,
                identityController, actionWrappersProvider);
        ActionManager.setActionManager(actionManager);
        return actionManager;
    }

    /**
     * Provides an action controller.
     *
     * @param actionManager The action manager to use as a controller.
     * @return An action controller to use.
     */
    @Provides
    public ActionController getActionController(final ActionManager actionManager) {
        return actionManager;
    }

    /**
     * Provides a lifecycle controller.
     *
     * @param controller The concrete implementation to use.
     * @return The lifecycle controller the app should use.
     */
    @Provides
    public LifecycleController getLifecycleController(final SystemLifecycleController controller) {
        return controller;
    }

    /**
     * Provides a status bar manager.
     *
     * @return The status bar manager the client should use.
     */
    @Provides
    @Singleton
    public StatusBarManager getStatusBarManager() {
        final StatusBarManager manager = new StatusBarManager();
        StatusBarManager.setStatusBarManager(manager);
        return manager;
    }

    /**
     * Gets the message sink manager for the client.
     *
     * @param statusBarManager The status bar manager to use for status bar sinks.
     * @return The message sink manager the client should use.
     */
    @Provides
    @Singleton
    public MessageSinkManager getMessageSinkManager(final StatusBarManager statusBarManager) {
        final MessageSinkManager messageSinkManager = new MessageSinkManager();
        MessageSinkManager.setManager(messageSinkManager);
        messageSinkManager.loadDefaultSinks(statusBarManager);
        return messageSinkManager;
    }

    /**
     * Gets the command manager the client should use.
     *
     * @param serverManager The manager to use to iterate servers.
     * @param identityController The controller to use to read settings.
     * @param commandLoader The loader to use to populate default commands.
     * @return The command manager the client should use.
     */
    @Provides
    @Singleton
    public CommandManager getCommandManager(
            final ServerManager serverManager,
            final IdentityController identityController,
            final CommandLoader commandLoader) {
        final CommandManager manager = new CommandManager(serverManager);
        manager.initialise(identityController.getGlobalConfiguration());
        CommandManager.setCommandManager(manager);
        commandLoader.loadCommands(manager);
        return manager;
    }

    /**
     * Gets a command controller for use in the client.
     *
     * @param commandManager The manager to use as a controller.
     * @return The command controller the client should use.
     */
    @Provides
    public CommandController getCommandController(final CommandManager commandManager) {
        return commandManager;
    }

    /**
     * Gets an initialised plugin manager for the client.
     *
     * @param identityController The controller to read settings from.
     * @param actionController The action controller to use for events.
     * @param updateManager The update manager to inform about plugins.
     * @param directory The directory to load and save plugins in.
     * @return An initialised plugin manager for the client.
     */
    @Provides
    @Singleton
    public PluginManager getPluginManager(
            final IdentityController identityController,
            final ActionController actionController,
            final UpdateManager updateManager,
            @Directory(DirectoryType.PLUGINS) final String directory) {
        final PluginManager manager = new PluginManager(identityController, actionController, updateManager, directory);
        final CorePluginExtractor extractor = new CorePluginExtractor(manager, directory);
        checkBundledPlugins(extractor, manager, identityController.getGlobalConfiguration());

        for (String service : new String[]{"ui", "tabcompletion", "parser"}) {
            ensureExists(extractor, manager, service);
        }

        // The user may have an existing parser plugin (e.g. twitter) which
        // will satisfy the service existance check above, but will render the
        // client pretty useless, so we'll force IRC extraction for now.
        extractor.extractCorePlugins("parser_irc");
        manager.refreshPlugins();
        return manager;
    }

    /**
     * Gets a core plugin extractor.
     *
     * @param pluginManager The plugin manager to notify about updates.
     * @param directory The directory to extract plugins to.
     * @return A plugin extractor for the client to use.
     */
    @Provides
    public CorePluginExtractor getCorePluginExtractor(
            final PluginManager pluginManager,
            @Directory(DirectoryType.PLUGINS) final String directory) {
        return new CorePluginExtractor(pluginManager, directory);
    }

    /**
     * Gets an update manager for the client.
     *
     * @param commandLineParser CLI parser to use to find launcher version.
     * @return The update manager to use.
     */
    @Provides
    @Singleton
    public UpdateManager getUpdateManager(final CommandLineParser commandLineParser) {
        UpdateChecker.init();
        final UpdateManager manager = UpdateChecker.getManager();

        if (commandLineParser.getLauncherVersion() != null) {
            LauncherComponent.setLauncherInfo(manager, commandLineParser.getLauncherVersion());
        }

        return manager;
    }

    /**
     * Gets a theme manager for the client.
     *
     * @param controller The identity controller to use to access settings.
     * @param directory The directory to load themes from.
     * @return An initialised theme manager instance.
     */
    @Provides
    @Singleton
    public ThemeManager getThemeManager(
            final IdentityController controller,
            @Directory(DirectoryType.THEMES) final String directory) {
        final ThemeManager manager = new ThemeManager(controller, directory);
        ThemeManager.setThemeManager(manager);
        manager.refreshAndLoadThemes();
        return manager;
    }

    /**
     * Gets the alias actions wrapper.
     *
     * @param commandController The controller to register commands with
     * @param serverManager The manager to use to iterate servers.
     * @return An alias wrapper to use in the client.
     */
    @Provides(type = Provides.Type.SET)
    @Singleton
    public ActionGroup getAliasWrapper(
            final CommandController commandController,
            final ServerManager serverManager) {
        final AliasWrapper wrapper = new AliasWrapper(commandController, serverManager);
        AliasWrapper.setAliasWrapper(wrapper);
        return wrapper;
    }

    /**
     * Gets the performs actions wrapper.
     *
     * @return An performs wrapper to use in the client.
     */
    @Provides(type = Provides.Type.SET)
    @Singleton
    public ActionGroup getPerformWrapper() {
        final PerformWrapper wrapper = new PerformWrapper();
        PerformWrapper.setPerformWrapper(wrapper);
        return wrapper;
    }

    /**
     * Gets the colour manager.
     *
     * @param controller The identity controller to read settings from.
     * @return A colour manager for the client.
     */
    @Provides
    @Singleton
    public ColourManager getColourManager(final IdentityController controller) {
        final ColourManager manager = new ColourManager(controller.getGlobalConfiguration());
        ColourManager.setColourManager(manager);
        return manager;
    }

    /**
     * Called when the global config cannot be loaded due to an error. This
     * method informs the user of the problem and installs a new default config
     * file, backing up the old one.
     *
     * @param identityManager The identity manager to re-initialise after installing defaults.
     * @param configdir The directory to extract default settings into.
     */
    private void handleInvalidConfigFile(final IdentityManager identityManager, final String configdir) {
        final String date = new SimpleDateFormat("yyyyMMddkkmmss").format(new Date());

        final String message = "DMDirc has detected that your config file "
                + "has become corrupted.<br><br>DMDirc will now backup "
                + "your current config and try restarting with a default "
                + "config.<br><br>Your old config will be saved as:<br>"
                + "dmdirc.config." + date;

        if (!GraphicsEnvironment.isHeadless()) {
            new WarningDialog("Invalid Config File", message).displayBlocking();
        }

        // Let command-line users know what is happening.
        System.out.println(message.replace("<br>", "\n"));

        final File configFile = new File(configdir + "dmdirc.config");
        final File newConfigFile = new File(configdir + "dmdirc.config." + date);

        if (configFile.renameTo(newConfigFile)) {
            try {
                identityManager.initialise();
            } catch (InvalidIdentityFileException iife) {
                // This shouldn't happen!
                Logger.appError(ErrorLevel.FATAL, "Unable to load global config", iife);
            }
        } else {
            final String newMessage = "DMDirc was unable to rename the "
                    + "global config file and is unable to fix this issue.";
            if (!GraphicsEnvironment.isHeadless()) {
                new WarningDialog("Invalid Config File", newMessage).displayBlocking();
            }
            System.out.println(newMessage.replace("<br>", "\n"));
            System.exit(1);
        }
    }

    /**
     * Ensures that there is at least one provider of the specified
     * service type by extracting matching core plugins. Plugins must be named
     * so that their file name starts with the service type, and then an
     * underscore.
     *
     * @param corePluginExtractor Extractor to use if the service doesn't exist
     * @param pm The plugin manager to use to access services
     * @param serviceType The type of service that should exist
     */
    public void ensureExists(
            final CorePluginExtractor corePluginExtractor,
            final PluginManager pm,
            final String serviceType) {
        if (pm.getServicesByType(serviceType).isEmpty()) {
            corePluginExtractor.extractCorePlugins(serviceType + "_");
            pm.refreshPlugins();
        }
    }

    /**
     * Checks whether the plugins bundled with this release of DMDirc are newer
     * than the plugins known by the specified {@link PluginManager}. If the
     * bundled plugins are newer, they are automatically extracted.
     *
     * @param corePluginExtractor Extractor to use if plugins need updating.
     * @param pm The plugin manager to use to check plugins
     * @param config The configuration source for bundled versions
     */
    private void checkBundledPlugins(
            final CorePluginExtractor corePluginExtractor,
            final PluginManager pm,
            final ConfigManager config) {
        for (PluginInfo plugin : pm.getPluginInfos()) {
            if (config.hasOptionString("bundledplugins_versions", plugin.getMetaData().getName())) {
                final Version bundled = new Version(config.getOption("bundledplugins_versions",
                        plugin.getMetaData().getName()));
                final Version installed = plugin.getMetaData().getVersion();

                if (installed.compareTo(bundled) < 0) {
                    corePluginExtractor.extractCorePlugins(plugin.getMetaData().getName());
                    pm.reloadPlugin(plugin.getFilename());
                }
            }
        }
    }

}