var Ennemy = function(game, options)
{
    var self=this;

    self.options = options;
    self.game=game;
    self.move_speed= 0.2;
    self.run_speed= 1.1;
    self.check_vision_every= 80;

    self.is_running= false;
    self.running_timer= null;

    self.id='ennemy'+Math.random();
    self.move_action_weight=0;

    self.is_moving=false;
    self.in_cells=[];
    self.vision_distance=game.opt.door_size*1.5;

    this.build = function()
    {
        this.patrol_id = 0;
        this.patrol_inc = 1;
        this.patrol_waiting_timer = null;

        this.patrol_right_left_inc = 4;
        this.patrol_right_left_deg = 180;
        this.next_pos = this.get_next_patrol_point();

        this.create();
    };
};

Ennemy.prototype.create =function()
{
    var self=this;
    this.container = new THREE.Object3D();
    this.game.scene.add(this.container);

    // Cube simulating ennemy, for collision detection
    var cube_material = new THREE.MeshBasicMaterial( { color: 0x0000ff, transparent:true, opacity: 0.3   } );
    if(game.opt.debug_level>1)
    {
        cube_material = new THREE.MeshBasicMaterial( { color: 0x0000ff, transparent:true, opacity: 1   } );
    }
    var cube_geo = new THREE.BoxGeometry(6 , 6, 6);
    this.container_mesh = new THREE.Mesh(cube_geo, cube_material);
    this.container_mesh.rotation.x = Math.radians(90);
    this.container_mesh.rotation.z = Math.radians(45);
    this.container_mesh.position.y=1;
    this.container.add(this.container_mesh);

    this.container.position.x = this.options.x;
    this.container.position.y = 0;
    this.container.position.z = this.options.z;

    // Vision geometry
    this.vision_geom = new THREE.Geometry();

    var deg_angle= 90;
    var current_deg_angle = 0;
    
    var angle = Math.radians(45-current_deg_angle);
    var v1 = new THREE.Vector3(0, 1, 0);
    var v2 = new THREE.Vector3(-Math.cos(angle)*this.vision_distance,1,Math.sin(angle)*this.vision_distance);
    var v3 = new THREE.Vector3(Math.cos(angle)*this.vision_distance,1,Math.sin(angle)*this.vision_distance);

    this.vision_orig_vertices=[];
    this.vision_geom.vertices.push(v1);
    this.vision_orig_vertices.push(v1.clone());
    this.vision_geom.vertices.push(v2);
    this.vision_orig_vertices.push(v2.clone());
    this.vision_geom.vertices.push(v3);
    this.vision_orig_vertices.push(v3.clone());

    var vIndex=2;
    for(true; current_deg_angle<deg_angle; current_deg_angle+=10)
    {
        var angle = Math.radians(90-current_deg_angle);
        vLast = new THREE.Vector3(-Math.cos(angle)*this.vision_distance,1,Math.sin(angle)*this.vision_distance);
        this.vision_geom.vertices.push(vLast);
        this.vision_orig_vertices.push(vLast.clone());
        vLast = new THREE.Vector3(Math.cos(angle)*this.vision_distance,1,Math.sin(angle)*this.vision_distance);
        this.vision_geom.vertices.push(vLast);
        this.vision_orig_vertices.push(vLast.clone());
        this.vision_geom.faces.push(new THREE.Face3(0,vIndex-1,vIndex+1));
        this.vision_geom.faces.push(new THREE.Face3(0,vIndex,vIndex+2));

        vIndex+=2;
    }
    this.vision_geom.computeFaceNormals();
    this.vision_geom.dynamic=true;
    this.vision_geom.verticesNeedUpdate=true;


    var vision_material = new THREE.MeshBasicMaterial( { color: 0x335533, transparent:true, opacity: 0.5  } );
    if(game.opt.debug_level>1)
    {
        vision_material = new THREE.MeshBasicMaterial( { color: 0x00ff00, wireframe:true, transparent:true, opacity: 1  } );
    }
    this.vision = new THREE.Mesh( this.vision_geom, vision_material);

    this.vision.rotation.y=Math.radians(0);
    this.vision.position.x = this.options.x;
    this.vision.position.y = 0;
    this.vision.position.z = this.options.z;
    game.scene.add(this.vision);

    var materials = game.assets.ennemy_mat;
    for ( var i = 0; i < materials.length; i ++ ) {
        var m = materials[ i ];
        m.skinning = true;
        m.morphTargets = true;
    }

    this.mesh = new THREE.SkinnedMesh( game.assets.ennemy_geo, new THREE.MultiMaterial(materials));
    this.mesh.scale.x=15;
    this.mesh.scale.y=15;
    this.mesh.scale.z=15;
    this.container.add(this.mesh);
    this.mesh.receiveShadow  = true;
    //this.mesh.castShadow  = true;

    this.mesh.position.x = 0;
    this.mesh.position.y = 1;
    this.mesh.position.z = 0;

    this.mixer = new THREE.AnimationMixer( this.mesh );

    this.walkingClip = game.assets.ennemy_geo.animations[2];
    this.iddlingClip = game.assets.ennemy_geo.animations[1];

    this.move_action = this.mixer.clipAction(this.walkingClip, null ).setDuration(0.45);
    this.idle_action = this.mixer.clipAction(this.iddlingClip, null ).setDuration(5);

    this.move_action.play();
    this.idle_action.play();
    this.move_action.setEffectiveWeight(0);
    this.idle_action.setEffectiveWeight(1);

    this.walk();
};

Ennemy.prototype.run = function(destination)
{
    window.clearTimeout(this.patrol_waiting_timer);
    window.clearTimeout(this.running_timer);
    this.patrol_waiting_timer=null;
    this.running_timer=null;

    this.move_destination = destination;
    this.moveTo(this.move_destination);
    this.lookAt(this.move_destination, this.move_destination);
    if(!this.is_running)
    {
        this.is_running=true;
        this.move_action.setDuration(0.45);
    }
    this.running_timer = window.setTimeout(this.walk.bind(this), 2000);
};

Ennemy.prototype.walk = function()
{
    window.clearTimeout(this.running_timer);
    window.clearTimeout(this.patrol_waiting_timer);
    this.patrol_waiting_timer=null;
    this.running_timer=null;

    if(this.is_running)
    {
        this.is_running=false;
        if(this.move_destination)
        {
            this.moveTo(this.move_destination);
            this.move_action.setDuration(0.8);
        }
    }
};


Ennemy.prototype.lookAt= function(pos,view_pos)
{
    pos.y=0;
    this.container.lookAt(pos);
    this.vision.lookAt(view_pos);
}


Ennemy.prototype.moveTo= function(pos)
{
    var current_pos = this.container.position;
    if(current_pos.equals(pos))
    {
        return;
    }

    // Last part of moving
    this.is_moving=true;

    var distance = Math.sqrt(Math.pow(pos.x-current_pos.x,2)+Math.pow(pos.z-current_pos.z,2));
    var directionX = (pos.x-current_pos.x) / distance;
    var directionZ = (pos.z-current_pos.z) / distance;

    var speed = this.is_running ? this.run_speed : this.move_speed;
    move_step_x = speed * directionX;
    move_step_z = speed * directionZ;

    this.move_step_vector_x = new THREE.Vector2();
    this.move_step_vector_z = new THREE.Vector2();
    this.move_step_vector_x.x = move_step_x;
    this.move_step_vector_x.z=0;
    this.move_step_vector_z.x=0;
    this.move_step_vector_z.z = move_step_z;

    // Actually moving...
    this.move_destination = pos;
    if(this.move_action_weight!=1)
    {
        this.move_weight_destination = 1;
    }
};

Ennemy.prototype.move_step= function()
{
    if(this.is_moving)
    {
        var moving=0;

        // Patrol right/left
        if(!this.is_running)
        {
            this.patrol_right_left_deg+=this.patrol_right_left_inc;
            this.patrol_right_left_deg = this.patrol_right_left_deg%360;
            
            var rad_ang = Math.radians(this.patrol_right_left_deg);
            var diff_x = Math.abs(this.container.position.x>this.move_destination.x ? this.container.position.x-this.move_destination.x : this.move_destination.x - this.container.position.x);
            var diff_z = Math.abs(this.container.position.z>this.move_destination.z ? this.container.position.z-this.move_destination.z : this.move_destination.z - this.container.position.z);
            var distance = Math.sqrt(diff_x + diff_z);
            if(distance>2)
            {
                this.lookAt(this.move_destination,{
                    x: this.move_destination.x + Math.cos(rad_ang) * distance,
                    y: this.move_destination.y,
                    z: this.move_destination.z + Math.sin(rad_ang) * distance
                });
            }
        }


        if(this.container.position.x!=this.move_destination.x || this.container.position.z!=this.move_destination.z)
        {
            moving++;
        }
        // Moving X restrictions
        if(Math.abs(this.container.position.x - this.move_destination.x) > 1)
        {
            this.container.position.add(this.move_step_vector_x);
            this.vision.position.add(this.move_step_vector_x);
        }
        else
        {
            this.container.position.x = this.move_destination.x;
            this.vision.position.x = this.move_destination.x;
        }
        if(Math.abs(this.container.position.z - this.move_destination.z) > 1)
        {
            this.container.position.add(this.move_step_vector_z);
            this.vision.position.add(this.move_step_vector_z);
        }
        else
        {
            this.container.position.z = this.move_destination.z;
            this.vision.position.z = this.move_destination.z;
        }

        if(!moving)
        {
            game.assets.step_sound.pause();
            this.move_weight_destination = 0;
            this.is_moving=false;
            this.move_destination=null;
        }

    }
    else
    {
        this.patrol_right_left_deg+=this.patrol_right_left_inc;
        this.patrol_right_left_deg = this.patrol_right_left_deg%360;

        var rad_ang = Math.radians(this.patrol_right_left_deg);
        var diff_x = Math.abs(this.container.position.x>this.next_pos.x ? this.container.position.x-this.next_pos.x : this.next_pos.x - this.container.position.x);
        var diff_z = Math.abs(this.container.position.z>this.next_pos.z ? this.container.position.z-this.next_pos.z : this.next_pos.z - this.container.position.z);
        var distance = Math.sqrt(diff_x + diff_z);

        this.lookAt(this.next_pos,{
            x: this.next_pos.x + Math.cos(rad_ang) * distance,
            y: this.next_pos.y,
            z: this.next_pos.z + Math.sin(rad_ang) * distance
        });
    }
};

Ennemy.prototype.update_vision = function()
{
    this.check_vision_loop=1;
    if(!this.check_vision_timer)
    {
        this.check_vision();
    }
};
Ennemy.prototype.check_vision = function()
{
    if(!this.check_vision_loop)
    {
        return;
    }

    // Collision callbacks
    var originPoint = this.container.position;
    var obstacles = game.getObstaclesWithPlayer();

    var collisions=[];

    for (var vertexIndex = 1; vertexIndex < this.vision.geometry.vertices.length; vertexIndex++)
    {
        var localVertex = this.vision.geometry.vertices[vertexIndex].clone();
        var globalVertex = localVertex.applyMatrix4( this.vision.matrix );
        var directionVector = globalVertex.sub( this.vision.position );

        var ray = new THREE.Raycaster( originPoint, directionVector.clone().normalize(),0, this.vision_distance);
        var collisionResults = ray.intersectObjects(obstacles);

        this.vision.geometry.vertices[vertexIndex].x = this.vision_orig_vertices[vertexIndex].x;
        this.vision.geometry.vertices[vertexIndex].y = this.vision_orig_vertices[vertexIndex].y;
        this.vision.geometry.vertices[vertexIndex].z = this.vision_orig_vertices[vertexIndex].z;
        this.vision.geometry.verticesNeedUpdate=true;

        if ( collisionResults.length > 0 && collisionResults[0].distance < this.vision_distance)
        {
            // Display limited vision vertice 
            if(collisionResults[0].object.name=='walls')
            {
                var distance = collisionResults[0].distance;
                this.vision.geometry.vertices[vertexIndex].x *= distance / this.vision_distance;
                this.vision.geometry.vertices[vertexIndex].y *= distance / this.vision_distance;
                this.vision.geometry.vertices[vertexIndex].z *= distance / this.vision_distance;
            }
            if(collisionResults[0].object.name=='p')
            {
                collisions.push(collisionResults[0].point);
            }
        }
    }
    if(collisions.length>0)
    {
        this.run(game.focus_perso.container.position.clone());
    }

    // Loop check vision
    this.check_vision_loop=0;
    this.check_vision_timer= window.setTimeout(this.check_vision_end.bind(this), this.check_vision_every);
};

Ennemy.prototype.check_vision_end  = function()
{
    this.check_vision_timer=null;
    this.check_vision();
};

Ennemy.prototype.move_weight  = function()
{
    if(this.move_weight_destination!==null)
    {
        var c = this.move_action.getEffectiveWeight();
        var dest;
        if(c>this.move_weight_destination)
        {
            var dest = Math.max(0,c-0.3);

            this.move_action.setEffectiveWeight(dest);
            this.idle_action.setEffectiveWeight(1-dest);
            this.move_action_weight=dest;
        }
        else if(c<this.move_weight_destination)
        {
            var dest = Math.min(1,c+0.3);
            this.move_action.setEffectiveWeight(dest);
            this.idle_action.setEffectiveWeight(1-dest);
            this.move_action_weight=dest;
        }
        else
        {
            this.move_weight_destination=null;
        }
        this.move_action_weight=c;
    }
};

Ennemy.prototype.update= function(delta)
{
    var self=this;
    this.mixer.update(delta);
    this.delta=delta;
    if(!this.move_destination)
    {
        if(!this.patrol_waiting_timer)
        {
            var pos = this.next_pos;
            this.lookAt(pos,pos);

            console.log('will move to ',pos);
            this.patrol_waiting_timer=window.setTimeout(function()
            {
                self.patrol_waiting_timer=null;
                self.move_weight_destination=1;
                self.moveTo(pos);
                self.next_pos = self.get_next_patrol_point();
            }, 2000);
        }
    }

    this.move_step();
    this.move_weight();
    this.update_vision();
};

Ennemy.prototype.get_next_patrol_point = function()
{
    var next_id = this.patrol_id+this.patrol_inc;
    var next_inc = this.patrol_inc;
    this.patrol_id+= next_inc

    if(next_id<0)
    {
        next_inc=1;
        next_id=1;
    } 
    if(next_id>=this.options.patrol_positions.length)
    {
        next_id=this.options.patrol_positions.length-2;
        next_inc=-1;
    }
    this.patrol_id=next_id;
    this.patrol_inc=next_inc;

    return this.options.patrol_positions[next_id];
};