/*******************************************************************************

 * Copyright (c) 2009 Symbian Foundation and/or its subsidiary(-ies).

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of the License "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Symbian Foundation - initial contribution.

 * Contributors:

 * Description:

 * Overview:

 * Details:

 * Platforms/Drives/Compatibility:

 * Assumptions/Requirement/Pre-requisites:

 * Failures and causes:

 *******************************************************************************/

package org.symbian.tools.tmw.debug.internal.launch;

import java.io.File;

import java.io.FileFilter;

import java.io.IOException;

import java.text.MessageFormat;

import java.util.Collections;

import java.util.HashMap;

import java.util.Map;

import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.core.runtime.CoreException;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.runtime.Path;

import org.eclipse.core.runtime.Status;

import org.symbian.tools.tmw.debug.internal.Activator;

import org.symbian.tools.tmw.debug.internal.ChromeDebugUtils;

import org.symbian.tools.wrttools.util.CoreUtil;

public class ChromeInstancesManager {

    private static final String[] CHROME_ARGS = { "%s", "--remote-shell-port=%d", // Here we will set port

            "--user-data-dir=%s", // Here we will set profile folder so user settings have no effect

            "--disk-cache-dir=%s", // We don't care

            "--disable-web-security", // Widgets can use network now

            "--disable-extenions", // Use standard UI, should also improve speed and stability

            "--activate-on-launch", // Bring to front on Mac

            "--disable-geolocation", // Use our own Geolocation (needed to emulate Geolocation in phonegap) 

            "--disable-local-storage", // Disable local storage (needed to emulate Geolocation in phonegap) 

            "--disable-session-storage", // Disable local storage (needed to emulate Geolocation in phonegap) 

            "--no-default-browser-check", // Our users don't need this nagging

            "--disable-hang-monitor", // Fix for Bug 2682 - The debugger should disable "unresponsive" error message from chrome

            "--no-first-run", // We don't care

            "--app=%s" // Here we will have widget URI as --app argument

    };

    private final Map<Object, Process> chromes = Collections.synchronizedMap(new HashMap<Object, Process>());

    private static final int EXECUTIBLE_INDEX = 0;

    private static final int PORT_INDEX = 1;

    private static final int USER_DATA_INDEX = 2;

    private static final int CACHE_INDEX = 3;

    private static final int URL_INDEX = CHROME_ARGS.length - 1;

    private int profileNum = 0;

    public void startChrome(final Object key, int port, final String url) throws CoreException {

        final String browserExecutable = ChromeDebugUtils.getChromeExecutible();

        if (browserExecutable == null) {

            throw createCoreException("No Chrome browser available", null);

        }

        String[] commandline = new String[CHROME_ARGS.length];

        System.arraycopy(CHROME_ARGS, 0, commandline, 0, CHROME_ARGS.length);

        commandline[EXECUTIBLE_INDEX] = String.format(CHROME_ARGS[EXECUTIBLE_INDEX], browserExecutable);

        commandline[PORT_INDEX] = String.format(CHROME_ARGS[PORT_INDEX], port);

        commandline[USER_DATA_INDEX] = String.format(CHROME_ARGS[USER_DATA_INDEX], getChromeProfilePath());

        commandline[CACHE_INDEX] = String.format(CHROME_ARGS[CACHE_INDEX], getChromeCachePath());

        commandline[URL_INDEX] = String.format(CHROME_ARGS[URL_INDEX], url);

        // 2. Start Chrome

        try {

            Process process = Runtime.getRuntime().exec(commandline);

            chromes.put(key, process);

        } catch (IOException e) {

            StringBuilder builder = new StringBuilder();

            for (String string : commandline) {

                builder.append(" ").append(string);

            }

            throw createCoreException("Cannot execute: {0}", builder.toString().trim(), e);

        }

    }

    private String getChromeCachePath() {

        return getChromeSpecialDir(".chromecache");

    }

    /**

     * Terminate Chrome instance associated with given key.

     */

    public synchronized void stopChrome(final Object key) {

    }

    public synchronized void forgetChrome(final Object key) {

    }

    public synchronized void shutdown() {

        String dir = getChromeSpecialDir("");

        File directory = new File(dir);

        File[] files = directory.listFiles(new FileFilter() {

            public boolean accept(File pathname) {

                return pathname.isDirectory() && pathname.getName().matches("\\.chr\\d{3}")

                        && !isChromeRunning(pathname);

            }

        });

        boolean removedAll = true;

        for (File file : files) {

            removedAll = delete(file) && removedAll;

        }

        if (removedAll) {

            String cachePath = getChromeCachePath();

            delete(new File(cachePath));

        }

    }

    private boolean delete(File file) {

        if (!file.exists()) {

            return true;

        } else if (file.isDirectory()) {

            File[] files = file.listFiles();

            for (File f : files) {

                if (!delete(f)) {

                    return false;

                }

            }

        }

        return file.delete();

    }

    private CoreException createCoreException(String pattern, String arg, Throwable exeption) {

        return createCoreException(MessageFormat.format(pattern, arg), exeption);

    }

    private CoreException createCoreException(String message, Throwable exeption) {

        return new CoreException(new Status(IStatus.ERROR, Activator.PLUGIN_ID, message, exeption));

    }

    private String getChromeProfilePath() {

        while (true) {

            String dir = getChromeSpecialDir(String.format(".chr%03d", profileNum++));

            if (!new File(dir).exists()) {

                return dir;

            }

        }

    }

    private boolean isChromeRunning(File pathname) {

        File file = new File(pathname, "Default/Cookies");

        try {

            // Note: it is ok to delete cookies file - if it can be deleted then Chrome is not running.

            // If Chrome is running then we will not be able to delete the file.

            // We do not need to preserve state between launches. So it is ok to delete coockies.

            return file.exists() && !file.delete();

        } catch (Exception e) {

            Activator.log(e);

            return true;

        }

    }

    private String getChromeSpecialDir(String subdir) {

        IPath location = ResourcesPlugin.getWorkspace().getRoot().getLocation();

        if (CoreUtil.isLinux() && location.toString().length() > 50) {

            location = new Path(System.getProperty("user.home")).append(".wrtdebug");

        }

        return location.append(subdir).toOSString();

    }

}