/*
 * Copyright (c) 2009-2010 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.jme3.system;

import com.jme3.app.SettingsDialog;
import com.jme3.app.SettingsDialog.SelectionListener;
import com.jme3.asset.AssetManager;
import com.jme3.asset.AssetNotFoundException;
import com.jme3.asset.DesktopAssetManager;
import com.jme3.audio.AudioRenderer;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.SwingUtilities;

public class JmeSystem {
    
    private static final Logger logger = Logger.getLogger(JmeSystem.class.getName());
    private static boolean initialized = false;
    private static boolean lowPermissions = false;
    private static File storageFolder = null;
    
    public static synchronized File getStorageFolder(){
        if (lowPermissions){
            throw new UnsupportedOperationException("File system access restricted");
        }
        if (storageFolder == null){
            // Initialize storage folder
            storageFolder = new File(System.getProperty("user.home"), ".jme3");
            if (!storageFolder.exists()){
                storageFolder.mkdir();
            }
        }
        return storageFolder;
    }
    
    public static String getFullName() {
        return JmeVersion.FULL_NAME;
    }
    
    public static InputStream getResourceAsStream(String name) {
        return JmeSystem.class.getResourceAsStream(name);
    }

    public static URL getResource(String name) {
        return JmeSystem.class.getResource(name);
    }

    public static boolean trackDirectMemory() {
        return false;
    }

    public static void setLowPermissions(boolean lowPerm) {
        lowPermissions = lowPerm;
    }

    public static boolean isLowPermissions() {
        return lowPermissions;
    }

    public static AssetManager newAssetManager(URL configFile) {
        return new DesktopAssetManager(configFile);
    }

    public static AssetManager newAssetManager() {
        return new DesktopAssetManager(null);
    }

    public static boolean showSettingsDialog(AppSettings sourceSettings, final boolean loadFromRegistry) {
        if (SwingUtilities.isEventDispatchThread()) {
            throw new IllegalStateException("Cannot run from EDT");
        }

        final AppSettings settings = new AppSettings(false);
        settings.copyFrom(sourceSettings);
        String iconPath = sourceSettings.getSettingsDialogImage();
        final URL iconUrl = JmeSystem.class.getResource(iconPath.startsWith("/") ? iconPath : "/" + iconPath);
        if (iconUrl == null) {
            throw new AssetNotFoundException(sourceSettings.getSettingsDialogImage());
        }

        final AtomicBoolean done = new AtomicBoolean();
        final AtomicInteger result = new AtomicInteger();
        final Object lock = new Object();

        final SelectionListener selectionListener = new SelectionListener() {

            public void onSelection(int selection) {
                synchronized (lock) {
                    done.set(true);
                    result.set(selection);
                    lock.notifyAll();
                }
            }
        };
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                synchronized (lock) {
                    SettingsDialog dialog = new SettingsDialog(settings, iconUrl, loadFromRegistry);
                    dialog.setSelectionListener(selectionListener);
                    dialog.showDialog();
                }
            }
        });

        synchronized (lock) {
            while (!done.get()) {
                try {
                    lock.wait();
                } catch (InterruptedException ex) {
                }
            }
        }

        sourceSettings.copyFrom(settings);

        return result.get() == SettingsDialog.APPROVE_SELECTION;
    }

    private static boolean is64Bit(String arch) {
        if (arch.equals("x86")) {
            return false;
        } else if (arch.equals("amd64")) {
            return true;
        } else if (arch.equals("x86_64")) {
            return true;
        } else if (arch.equals("ppc") || arch.equals("PowerPC")) {
            return false;
        } else if (arch.equals("ppc64")) {
            return true;
        } else if (arch.equals("i386") || arch.equals("i686")) {
            return false;
        } else if (arch.equals("universal")) {
            return false;
        } else {
            throw new UnsupportedOperationException("Unsupported architecture: " + arch);
        }
    }

    public static Platform getPlatform() {
        String os = System.getProperty("os.name").toLowerCase();
        String arch = System.getProperty("os.arch").toLowerCase();
        boolean is64 = is64Bit(arch);
        if (os.contains("windows")) {
            return is64 ? Platform.Windows64 : Platform.Windows32;
        } else if (os.contains("linux") || os.contains("freebsd") || os.contains("sunos")) {
            return is64 ? Platform.Linux64 : Platform.Linux32;
        } else if (os.contains("mac os x") || os.contains("darwin")) {
            if (arch.startsWith("ppc")) {
                return is64 ? Platform.MacOSX_PPC64 : Platform.MacOSX_PPC32;
            } else {
                return is64 ? Platform.MacOSX64 : Platform.MacOSX32;
            }
        } else {
            throw new UnsupportedOperationException("The specified platform: " + os + " is not supported.");
        }
    }

    private static JmeContext newContextLwjgl(AppSettings settings, JmeContext.Type type) {
        try {
            Class<? extends JmeContext> ctxClazz = null;
            switch (type) {
                case Canvas:
                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.lwjgl.LwjglCanvas");
                    break;
                case Display:
                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.lwjgl.LwjglDisplay");
                    break;
                case OffscreenSurface:
                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.lwjgl.LwjglOffscreenBuffer");
                    break;
                default:
                    throw new IllegalArgumentException("Unsupported context type " + type);
            }

            return ctxClazz.newInstance();
        } catch (InstantiationException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (IllegalAccessException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (ClassNotFoundException ex) {
            logger.log(Level.SEVERE, "CRITICAL ERROR: Context class is missing!\n"
                    + "Make sure jme3_lwjgl-ogl is on the classpath.", ex);
        }

        return null;
    }

    private static JmeContext newContextJogl(AppSettings settings, JmeContext.Type type) {
        try {
            Class<? extends JmeContext> ctxClazz = null;
            switch (type) {
                case Display:
                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.jogl.JoglDisplay");
                    break;
                case Canvas:
                    ctxClazz = (Class<? extends JmeContext>) Class.forName("com.jme3.system.jogl.JoglCanvas");
                    break;
                default:
                    throw new IllegalArgumentException("Unsupported context type " + type);
            }

            return ctxClazz.newInstance();
        } catch (InstantiationException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (IllegalAccessException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (ClassNotFoundException ex) {
            logger.log(Level.SEVERE, "CRITICAL ERROR: Context class is missing!\n"
                    + "Make sure jme3_jogl is on the classpath.", ex);
        }

        return null;
    }

    private static JmeContext newContextCustom(AppSettings settings, JmeContext.Type type) {
        try {
            String className = settings.getRenderer().substring("CUSTOM".length());

            Class<? extends JmeContext> ctxClazz = null;
            ctxClazz = (Class<? extends JmeContext>) Class.forName(className);
            return ctxClazz.newInstance();
        } catch (InstantiationException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (IllegalAccessException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (ClassNotFoundException ex) {
            logger.log(Level.SEVERE, "CRITICAL ERROR: Context class is missing!", ex);
        }

        return null;
    }

    public static JmeContext newContext(AppSettings settings, JmeContext.Type contextType) {
        initialize(settings);
        JmeContext ctx;
        if (settings.getRenderer() == null
                || settings.getRenderer().equals("NULL")
                || contextType == JmeContext.Type.Headless) {
            ctx = new NullContext();
            ctx.setSettings(settings);
        } else if (settings.getRenderer().startsWith("LWJGL")) {
            ctx = newContextLwjgl(settings, contextType);
            ctx.setSettings(settings);
        } else if (settings.getRenderer().startsWith("JOGL")) {
            ctx = newContextJogl(settings, contextType);
            ctx.setSettings(settings);
        } else if (settings.getRenderer().startsWith("CUSTOM")) {
            ctx = newContextCustom(settings, contextType);
            ctx.setSettings(settings);
        } else {
            throw new UnsupportedOperationException(
                    "Unrecognizable renderer specified: "
                    + settings.getRenderer());
        }
        return ctx;
    }

    public static AudioRenderer newAudioRenderer(AppSettings settings) {
        initialize(settings);
        Class<? extends AudioRenderer> clazz = null;
        try {
            if (settings.getAudioRenderer().startsWith("LWJGL")) {
                clazz = (Class<? extends AudioRenderer>) Class.forName("com.jme3.audio.lwjgl.LwjglAudioRenderer");
            } else if (settings.getAudioRenderer().startsWith("JOAL")) {
                clazz = (Class<? extends AudioRenderer>) Class.forName("com.jme3.audio.joal.JoalAudioRenderer");
            } else {
                throw new UnsupportedOperationException(
                        "Unrecognizable audio renderer specified: "
                        + settings.getAudioRenderer());
            }

            AudioRenderer ar = clazz.newInstance();
            return ar;
        } catch (InstantiationException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (IllegalAccessException ex) {
            logger.log(Level.SEVERE, "Failed to create context", ex);
        } catch (ClassNotFoundException ex) {
            logger.log(Level.SEVERE, "CRITICAL ERROR: Audio implementation class is missing!\n"
                    + "Make sure jme3_lwjgl-oal or jm3_joal is on the classpath.", ex);
        }
        return null;
    }

    public static void initialize(AppSettings settings) {
        if (initialized) {
            return;
        }

        initialized = true;
        try {
            if (!lowPermissions) {
                // can only modify logging settings
                // if permissions are available
//                JmeFormatter formatter = new JmeFormatter();
//                Handler fileHandler = new FileHandler("jme.log");
//                fileHandler.setFormatter(formatter);
//                Logger.getLogger("").addHandler(fileHandler);
//                Handler consoleHandler = new ConsoleHandler();
//                consoleHandler.setFormatter(formatter);
//                Logger.getLogger("").removeHandler(Logger.getLogger("").getHandlers()[0]);
//                Logger.getLogger("").addHandler(consoleHandler);
            }
//        } catch (IOException ex){
//            logger.log(Level.SEVERE, "I/O Error while creating log file", ex);
        } catch (SecurityException ex) {
            logger.log(Level.SEVERE, "Security error in creating log file", ex);
        }
        logger.log(Level.INFO, "Running on {0}", getFullName());

        if (!lowPermissions) {
            try {
                Natives.extractNativeLibs(getPlatform(), settings);
            } catch (IOException ex) {
                logger.log(Level.SEVERE, "Error while copying native libraries", ex);
            }
        }
    }
}