/*
 * Copyright (c) 2006-2014 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.freedesktop_notifications;

import com.dmdirc.ClientModule.GlobalConfig;
import com.dmdirc.ClientModule.UserConfig;
import com.dmdirc.interfaces.config.AggregateConfigProvider;
import com.dmdirc.interfaces.config.ConfigChangeListener;
import com.dmdirc.interfaces.config.ConfigProvider;
import com.dmdirc.logger.ErrorLevel;
import com.dmdirc.logger.Logger;
import com.dmdirc.plugins.PluginDomain;
import com.dmdirc.plugins.implementations.PluginFilesHelper;
import com.dmdirc.ui.messages.Styliser;
import com.dmdirc.util.io.StreamReader;

import java.io.IOException;
import java.util.ArrayList;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.apache.commons.lang.StringEscapeUtils;

@Singleton
public class FDManager implements ConfigChangeListener {

    /** Global configuration. */
    private final AggregateConfigProvider config;
    /** User configuration. */
    private final ConfigProvider userConfig;
    /** This plugin's settings domain. */
    private final String domain;
    /** Plugin files helper. */
    private final PluginFilesHelper filesHelper;
    /** notification timeout. */
    private int timeout;
    /** notification icon. */
    private String icon;
    /** Escape HTML. */
    private boolean escapehtml;
    /** Strict escape. */
    private boolean strictescape;
    /** Strip codes. */
    private boolean stripcodes;

    @Inject
    public FDManager(@GlobalConfig final AggregateConfigProvider config,
            @UserConfig ConfigProvider userConfig,
            @PluginDomain(FreeDesktopNotificationsPlugin.class) final String domain,
            final PluginFilesHelper filesHelper) {
        this.domain = domain;
        this.config = config;
        this.userConfig = userConfig;
        this.filesHelper = filesHelper;
    }

    /**
     * Used to show a notification using this plugin.
     *
     * @param title   Title of dialog if applicable
     * @param message Message to show
     *
     * @return True if the notification was shown.
     */
    public boolean showNotification(final String title, final String message) {
        if (filesHelper.getFilesDir() == null) {
            return false;
        }

        final ArrayList<String> args = new ArrayList<>();

        args.add("/usr/bin/env");
        args.add("python");
        args.add(filesHelper.getFilesDirString() + "notify.py");
        args.add("-a");
        args.add("DMDirc");
        args.add("-i");
        args.add(icon);
        args.add("-t");
        args.add(Integer.toString(timeout * 1000));
        args.add("-s");

        if (title != null && !title.isEmpty()) {
            args.add(prepareString(title));
        } else {
            args.add("Notification from DMDirc");
        }
        args.add(prepareString(message));

        try {
            final Process myProcess = Runtime.getRuntime().exec(args.toArray(new String[]{}));
            final StringBuffer data = new StringBuffer();
            new StreamReader(myProcess.getErrorStream()).start();
            new StreamReader(myProcess.getInputStream(), data).start();
            try {
                myProcess.waitFor();
            } catch (InterruptedException e) {
            }
            return true;
        } catch (SecurityException | IOException e) {
        }

        return false;
    }

    /**
     * Prepare the string for sending to dbus.
     *
     * @param input Input string
     *
     * @return Input string after being processed according to config settings.
     */
    public String prepareString(final String input) {
        String output = input;
        if (stripcodes) {
            output = Styliser.stipControlCodes(output);
        }
        if (escapehtml) {
            if (strictescape) {
                output = StringEscapeUtils.escapeHtml(output);
            } else {
                output = output.replace("&", "&amp;");
                output = output.replace("<", "&lt;");
                output = output.replace(">", "&gt;");
            }
        }

        return output;
    }

    private void setCachedSettings() {
        timeout = config.getOptionInt(domain, "general.timeout");
        icon = config.getOption(domain, "general.icon");
        escapehtml = config.getOptionBool(domain, "advanced.escapehtml");
        strictescape = config.getOptionBool(domain, "advanced.strictescape");
        stripcodes = config.getOptionBool(domain, "advanced.stripcodes");
    }

    /** {@inheritDoc} */
    @Override
    public void configChanged(final String domain, final String key) {
        setCachedSettings();
    }

    public void onLoad() {
        config.addChangeListener(domain, this);
        userConfig.setOption(domain, "general.icon", filesHelper.getFilesDirString() + "icon.png");
        setCachedSettings();
        // Extract the files needed
        try {
            filesHelper.extractResoucesEndingWith(".py");
            filesHelper.extractResoucesEndingWith(".png");
        } catch (IOException ex) {
            Logger.userError(ErrorLevel.MEDIUM,
                    "Unable to extract files for Free desktop notifications: " + ex.getMessage(), ex);
        }
    }

    public void onUnLoad() {
        config.removeListener(this);
    }

}