var Game = function(opt)
{
    var scene;
    var lock;
    var SCREEN_HEIGHT;
    var SCREEN_HEIGHT;
    var camera;
    var renderer;
    var mazes= {};

    var camera_decal_x = -34;
    var camera_decal_y = 100;
    var camera_decal_z = 30;

    // "Main perso view"
    //var camera_decal_x = -10;
    //var camera_decal_y = 10;
    //var camera_decal_z = -10;


    var clock  = new THREE.Clock();

    var stats = new Stats();
    stats.showPanel( 0 ); // 0: fps, 1: ms, 2: mb, 3+: custom
    document.body.appendChild( stats.dom );

    var start_num_maze = 6;
    var maze_increment = 1;

    this.load = function()
    {
        var promises = [];
        this.assets = new Assets();
        return  this.assets.load();
    };

    this.init = function()
    {
        var self=this;
        this.load().then(function()
        {
            self.init_loaded();
        }, function()
        {
            alert('Error loading some assets...');
        });
    };

    this.init_loaded= function()
    {
        var self=this;
        this.opt = opt;

        this.obstacles = [];
        this.obstacles_with_player = [];
        this.collision_callbacks = [];
        this.scene = new THREE.Scene();


        // Build basic structures
        var width = 10000;
        var height = 10000;
        var click_ground = new THREE.PlaneGeometry(width, height);
        var material = new THREE.LineBasicMaterial( { color: 0x555555, opacity:0, transparent:true  } );
        // Set and add the click_ground
        this.click_ground = new THREE.Mesh(click_ground, material);
        this.click_ground.name='click_ground';
        this.click_ground.rotation.x = -Math.PI / 2;

        this.scene.add(this.click_ground);

        this.camera = new THREE.PerspectiveCamera(45, 1, 0.1, 10000);
        this.scene.add(this.camera);

        //this.scene.fog = new THREE.FogExp2( 0x333355, 0.0055 );

        this.ambient_light = new THREE.PointLight();
        this.ambient_light.intensity=1.0;
        this.ambient_light.position.set(100, 200, 80);
        this.scene.add(this.ambient_light);

        this.renderer = new THREE.WebGLRenderer({ antialias: true});
        this.renderer.setClearColor(0x000000, 1);
        this.renderer.shadowMapEnabled=true;
        this.renderer.shadowMapSoft=true;


        window.addEventListener( 'resize', onWindowResize, false );
        function onWindowResize(){
            self.camera.aspect = window.innerWidth / window.innerHeight;
            self.camera.updateProjectionMatrix();

            self.renderer.setSize( window.innerWidth, window.innerHeight );
        }
        this.container = opt.root;

        this.setAspect();
        this.container.appendChild(this.renderer.domElement);

        this.start();
        this.render();

        this.updateCollisionsCache();
    };

    this.setAspect= function()
    {
        var w = this.container.offsetWidth;
        // Fit the initial visible area's height
        h = this.container.offsetHeight;
        // Update the renderer and the camera
        this.renderer.setSize(w, h);
        this.camera.aspect = w / h;
        this.camera.updateProjectionMatrix();
    };

    this.setFocus = function(object)
    {
        this.camera.position.set(object.position.x + camera_decal_x, object.position.y + camera_decal_y, object.position.z + camera_decal_z);
        this.camera.position.set(object.position.x + camera_decal_x, object.position.y + camera_decal_y, object.position.z + camera_decal_z);
        this.camera.lookAt(object.position);
    };

    this.start = function()
    {
        var self=this;

        this.direction=0;
        // Create start path
        var path = new Path(this, {direction: this.direction, x: 0, z: 0});
        path.build();

        this.start_path = path;
        var pos = path.get_start_pos();
        var angle = Math.radians(30);
        pos.x += Math.cos(angle) * 20;
        pos.z += Math.sin(angle) * 20;

        this.focus_perso = self.add_character({
            x: pos.x,
            y: 0,
            z: pos.z,
            moveable: true,
            ai: false,
            game: self
        });
        this.focus_perso.name='main character';

        this.enterPath(path);
    };

    this.add_character= function(params)
    {
        return new Perso(this, params);
    },
    this.add_key= function(params)
    {
        return new Key(this, params);
    },

    this.render = function()
    {
        stats.begin();
        this.renderer.render(this.scene, this.camera);

        if(!this.updating)
        {
            this.updating=1;
            var delta = clock.getDelta();
            if(delta>0.070 && game.opt.debug_level>10)
            {
                console.warn('SLOW RENDERING DELTA: ',delta);
                delta=0.070;
            }
			//delta=0.030;

            this.focus_perso.update(delta);
            if(this.current_maze)
            {
                this.current_maze.update(delta);
            }
            this.setFocus(this.focus_perso.container);
            this.updating=0;
        }
	    requestAnimationFrame(this.render_fct);
        stats.end();
    };
    this.render_fct = this.render.bind(this);

    this.getObstacles = function()
    {
        return this.obstacles;
    };
    this.getObstaclesWithPlayer = function()
    {
        return this.obstacles_with_player;
    };
    this.getCollisionCallbacks = function()
    {
        return this.collision_callbacks;
    }

    this.generateCollisionCallbacks = function()
    {
        if(this.current_maze)
        {
            return this.current_maze.getCollisionCallbacks();
        }
        else
        {
            var coll = [];
            for (var i in mazes)
            {
                coll = coll.concat(mazes[i].getOutsideCollisionCallbacks());
            }
            return coll;
        }
    };

    this.callCollisionCallbacks = function(perso,collisions)
    {
        if(this.current_maze)
        {
            return this.current_maze.callCollisionCallbacks(perso, collisions);
        }
        else
        {
            if(collisions.length>0)
            {
                if(collisions[0].mazeid)
                {
                    this.inMaze(collisions[0].mazeid, collisions[0].cellid);
                }
            }
        }
    };

    this.enterPath = function(path)
    {
        var self=this;
        this.current_path=path;
        this.obstacles = this.current_path.getObstacles();
        if(!path.next_maze)
        {
            var pos = path.get_end_pos();
            var maze = new Maze(this, { maze_num: start_num_maze, x: pos.x, z: pos.z });
            this.last_maze=maze;
            start_num_maze+= maze_increment;
            path.next_maze = maze;
            maze.start_path = path;
            mazes[maze.id] = maze;
            maze.build();

            var pos = maze.doors.get_end_pos();
            var path = new Path(self, {direction: this.direction, x: pos.x, z: pos.z});
            maze.end_path = path;
            self.end_path = path;
            path.build();
        }
    }

    this.leaveMaze = function(id, path)
    {
        console.log('leave maze! ',id);
        var self=this;
        this.current_maze_id = null;
        this.current_maze = null;
        this.current_path = path;
        this.obstacles=[];
        this.obstacles_with_player=[];
        this.collision_callbacks = [];

        if(path){
            this.enterPath(path);
        }
    };

    this.updateCollisionsCache = function()
    {
        if(this.current_maze)
        {
            this.obstacles = this.current_maze.getObstacles();
            this.obstacles_with_player = [].concat(this.obstacles, this.focus_perso.container_mesh);
            // Debug - no walls
            //this.obstacles_with_player = [this.focus_perso.container_mesh];
        }
        this.collision_callbacks = this.generateCollisionCallbacks();
    };

    this.inMaze = function(mazeid, cellid)
    {
        if(this.current_maze_id!==mazeid)
        {
            console.log('in maze ',mazeid, cellid);
            this.current_path = null;
            this.current_maze_id = mazeid;
            this.current_maze = mazes[mazeid];
            this.current_maze.current_cell = cellid;
        }
    }
};