package electrosphere.engine;

import static org.lwjgl.glfw.GLFW.glfwGetTime;
import static org.lwjgl.glfw.GLFW.glfwTerminate;
import static org.lwjgl.glfw.GLFW.glfwWindowShouldClose;

import java.util.concurrent.TimeUnit;

import electrosphere.audio.AudioEngine;
import electrosphere.client.sim.ClientFunctions;
import electrosphere.controls.ControlHandler;
import electrosphere.engine.cli.CLIParser;
import electrosphere.engine.loadingthreads.LoadingThread;
import electrosphere.game.config.UserSettings;
import electrosphere.logger.LoggerInterface;
import electrosphere.net.parser.net.message.TerrainMessage;
import electrosphere.net.parser.net.raw.NetworkParser;
import electrosphere.net.parser.util.ByteStreamUtils;
import electrosphere.renderer.Model;
import electrosphere.renderer.RenderingEngine;
import electrosphere.util.worldviewer.TerrainViewer;



public class Main {
    
    
    

    
    
    
    //
    //Visualization Controls
    //
    //These are used in calculating the time between frames for visualization (camera) control and such
    static double deltaTime = 0.0f;
    static double lastFrame = 0.0f;
    static long frameCount = 0;
    public static float deltaFrames = 0;

    public static boolean running = true;
    
    //target amount of time per frame
    public static float targetFrameRate = 60.0f;
    static float targetFramePeriod = 1.0f/targetFrameRate;

    //framestep variable
    static int framestep = 2;
    
    public static void main(String args[]){
        
        //
        //
        //     I N I T I A L I Z A T I O N
        //
        //

        //parse command line arguments
        CLIParser.parseCLIArgs(args);

        startUp();
        
        mainLoop();

    }

    public static void startUp(){
        //initialize logging interfaces
        LoggerInterface.initLoggers();

        //load user settings
        UserSettings.loadUserSettings();

        //controls
        if(Globals.RUN_CLIENT){
            initControlHandler();
        }
        
        //init global variables
        Globals.initGlobals();

        // if(1==1){
        //     SaveUtils.loadSave("arena");
        //     Globals.authenticationManager = new AuthenticationManager();
        //     String rawPass = "testpassword";
        //     String hashedPassword = AuthenticationManager.getHashedString(rawPass);
        //     boolean authed = Globals.authenticationManager.authenticate("testuser", hashedPassword);
        //     System.out.println("Authenticated: " + authed);
        //     System.exit(0);
        // }
        
        //world gen testing
        //gen terrain
//        Globals.serverTerrainManager = new ServerTerrainManager(2000,50,100,0.0f,0);
//        Globals.serverTerrainManager.load();
//        Globals.serverWorldData = ServerWorldData.createGameWorld(Globals.serverTerrainManager);
//        //gen world
//        Globals.macroData = MacroData.generateWorld(0);
//        Globals.macroData.describeWorld();
//        boolean run = true;
//        Globals.macroSimulation = new MacroSimulation();
//        while(run){
//            Globals.macroSimulation.simulate();
//            try {
//                TimeUnit.MILLISECONDS.sleep(1000);
//            } catch (InterruptedException ex) {
//                ex.printStackTrace();
//            }
//        }

//        if(1==1){
//            Globals.audioEngine = new AudioEngine();
//            Globals.audioEngine.init();
//            Globals.assetManager.addAudioPathToQueue("/Audio/MenuStartup.ogg");
//            Globals.assetManager.loadAssetsInQueue();
//            Globals.audioEngine.setGain(0.1f);
//            AudioSource startupSound = AudioUtils.playAudioAtLocation("/Audio/MenuStartup.ogg", new Vector3f(3,0,0));
//            if(startupSound != null){
//                while(startupSound.isPlaying()){
//                    try {
//                        TimeUnit.MILLISECONDS.sleep(10);
//                    } catch (InterruptedException ex) {
//                        ex.printStackTrace();
//                    }
//                }
//            }
//            System.exit(0);
//        }

        

        //debug: create terrain/world viewer
    //    TerrainViewer.runViewer();
        
        //create the drawing context
        if(Globals.RUN_CLIENT && !Globals.HEADLESS){
            Globals.renderingEngine = new RenderingEngine();
            Globals.renderingEngine.createOpenglContext();
        }
        
        //uncomment to test loading a model into engine
    //    if(1==1){
    //        Globals.assetManager.addModelPathToQueue("/Models/tank1.fbx");
    //        Globals.assetManager.loadAssetsInQueue();
    //        Model model = Globals.assetManager.fetchModel("/Models/tank1.fbx");
    //     //    for(electrosphere.renderer.anim.Animation anim : model.animations){
    //     //        if(anim.name.equals("Armature|Idle1")){
    //     //            System.out.println(anim.duration);
    //     //            for(electrosphere.renderer.anim.AnimChannel channel : anim.channels){
    //     //                if(channel.getNodeID().equals("Torso")){
    //     //                    channel.fullDescribeChannel();
    //     //                }
    //     //             //    System.out.println("CHannel: " + channel.getNodeID());
    //     //            }
    //     //            break;
    //     //        }
    //     //    }
    //         model.animations.get(0).fullDescribeAnimation();
    //     //    model.describeHighLevel();
    //        System.exit(0);
    //    }
        
        //create the audio context
        if(Globals.RUN_CLIENT && !Globals.HEADLESS){
            Globals.audioEngine = new AudioEngine();
            Globals.audioEngine.init();
            // Globals.audioEngine.setGain(0.1f);
        }
        
        //init default resources
        if(Globals.RUN_CLIENT && !Globals.HEADLESS){
            Globals.initDefaultGraphicalResources();
            Globals.initDefaultAudioResources();
        }
        
        //fire off a loading thread for the title menus/screen
        LoggerInterface.loggerStartup.INFO("Fire off loading thread");
        if(Globals.RUN_CLIENT){
            LoadingThread serverThread = new LoadingThread(LoadingThread.LOAD_TITLE_MENU);
            Globals.loadingThreadsList.add(serverThread);
            serverThread.start();
        } else {
            LoadingThread clientThread = new LoadingThread(LoadingThread.LOAD_ARENA);
            Globals.loadingThreadsList.add(clientThread);
            clientThread.start();
        }
        
        //recapture the screen for rendering
        if(Globals.RUN_CLIENT && !Globals.HEADLESS){
            LoggerInterface.loggerStartup.INFO("Recapture screen");
            Globals.controlHandler.setShouldRecapture(true);
        }
        // RenderUtils.recaptureScreen();
    }

    /**
     * Runs the main loop indefinitely. Blocks the thread this is called in.
     */
    public static void mainLoop(){
        mainLoop(0);
    }

    /**
     * Runs the main loop for a specified number of frames.
     * @param maxFrames The number of frames to run for. If 0, will run indefinitely.
     */
    public static void mainLoop(long maxFrames){

        //main loop
        while (running) {
            
            /*
            Frame calculation
            */
            double currentTime = glfwGetTime();
            deltaTime = currentTime - lastFrame;
            deltaFrames = targetFrameRate * (float)deltaTime;
            lastFrame = currentTime;
            
            
            ///
            ///    A S S E T     M A N A G E R     S T U F F
            ///
            if(Globals.RUN_CLIENT){
                Globals.assetManager.loadAssetsInQueue();
            }
            
            
            
            
            ///
            ///    C L I E N T    N E T W O R K I N G    S T U F F
            ///
            //Why is this its own function? Just to get the networking code out of main()
            if(Globals.RUN_CLIENT && Globals.clientConnection != null){
                Globals.clientConnection.parseMessages();
            }
            

            //handle framestep
            if(framestep == 1){
                framestep = 0;
            }
            
            
            ///
            ///    I N P U T     C O N T R O L S
            ///
            //Poll controls
            if(Globals.RUN_CLIENT){
                Globals.controlHandler.pollControls();
                Globals.controlHandler.recaptureIfNecessary();
            }
            
            
            
            ///
            ///    C L I E N T    S I M U L A T I O N    S T U F F
            ///
            if(Globals.clientSimulation != null && Globals.clientSimulation.isReady() && framestep > 0){
                ClientFunctions.runBeforeSimulationFunctions();
            }
            if(Globals.clientSimulation != null && Globals.clientSimulation.isLoadingTerrain() && framestep > 0){
                ClientFunctions.loadTerrain();
            }
            if(Globals.clientSimulation != null && Globals.clientSimulation.isReady() && framestep > 0){
                Globals.clientSimulation.simulate();
            }
            if(Globals.clientSimulation != null && Globals.clientSimulation.isReady() && framestep > 0){
                ClientFunctions.runClientFunctions();
            }

            ///
            ///    S E R V E R     M I C R O     S I M U L A T I O N
            ///
            if(Globals.realmManager != null){
                Globals.realmManager.simulate();
            }
            
            ///
            ///    M A C R O      S I M U L A T I O N     S T U F F
            ///
            if(Globals.macroSimulation != null && Globals.macroSimulation.isReady() && framestep > 0){
                Globals.macroSimulation.simulate();
            }
            
            
            if(Globals.RUN_CLIENT && !Globals.HEADLESS){
                Globals.renderingEngine.drawScreen();
            }
            
            if(Globals.ENGINE_SHUTDOWN_FLAG || (!Globals.HEADLESS && Globals.RUN_CLIENT && glfwWindowShouldClose(Globals.window))){
                running = false;
            }
            
            if(deltaTime < targetFramePeriod){
                sleep((int)(1000.0 * (targetFramePeriod - deltaTime)));
            } else {
                sleep(1);
            }
            frameCount++;

            if(maxFrames > 0 && frameCount > maxFrames){
                running = false;
            }

        }

        //
        //   S H U T D O W N
        //
        //Terminate the program.
        if(!Globals.HEADLESS && Globals.RUN_CLIENT){
            glfwTerminate();
        }
        //used to signal threads to stop
        running = false;
        if(Globals.server != null){
            Globals.server.close();
            Globals.serverThread.interrupt();
        }
        //shut down audio engine
        if(!Globals.HEADLESS && Globals.RUN_CLIENT){
            Globals.audioEngine.shutdown();
        }
        //if netmonitor is running, close
        if(Globals.netMonitor != null){
            Globals.netMonitor.close();
        }
    }

    public static long getCurrentFrame(){
        return frameCount;
    }
    
    static void sleep(int i) {
        try {
            TimeUnit.MILLISECONDS.sleep(i);
        } catch (InterruptedException ex) {
            System.out.println("Sleep somehow interrupted?!");
        }
    }
    
    
    public static boolean isRunning(){
        return running;
    }
    
    
    
    
    public static void initControlHandler(){
        LoggerInterface.loggerStartup.INFO("Initialize control handler");
        Globals.controlHandler = ControlHandler.generateExampleControlsMap();
        Globals.controlHandler.setCallbacks();
//        Globals.controlHandler = FileLoadingUtils.loadModelObjectFromBakedJsonFile("/Config/keybinds.json",ControlHandler.class);
    }
    
    /**
     * Sets the framestep state (2 to resume automatic, 1 to make single step)
     * @param framestep 2 - automatic framestep, 1 - single step, 0 - no step
     */
    public static void setFramestep(int framestep){
        Main.framestep = framestep;
    }

    
    
    
    // public static void updateMouseVariables(){
    //     glfwGetCursorPos(Globals.window, mouse_X_Buffer, mouse_Y_Buffer);
    //     xpos = mouse_X_Buffer[0];
    //     ypos = mouse_Y_Buffer[0];
    //     float xoffset = (float) (xpos - mouse_lastX) * mouseSensitivity;
    //     float yoffset = (float) (mouse_lastY - ypos) * mouseSensitivity;
    //     mouse_lastX = (float) xpos;
    //     mouse_lastY = (float) ypos;

    //     if(Globals.controlHandler != null && !Globals.controlHandler.isMouseVisible()){
    //         yaw = yaw + xoffset;
    //         pitch = pitch - yoffset;

    //         if (pitch > 100.0f) {
    //             pitch = 100.0f;
    //         }
    //         if (pitch < -99.0f) {
    //             pitch = -99.0f;
    //         }
    //     }
    // }
    
    
    
}