/**
 * Mesh Superset - The apiMesh properties get moved into the Mesh object itself, and then the instance is created
 * @param graphics GameLib.D3.Graphics
 * @param apiMesh GameLib.D3.API.Mesh
 * @param width
 * @param height
 * @param widthSegments
 * @param heightSegments
 * @constructor
 */
GameLib.D3.Mesh.Plane = function (
    graphics,
    apiMesh,
    width,
    height,
    widthSegments,
    heightSegments,
	heightMapScale,
	isHeightMap
) {
    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    if (GameLib.Utils.UndefinedOrNull(width)) {
        width = 1;
    }
    this.width = width;

    if (GameLib.Utils.UndefinedOrNull(height)) {
        height = 1;
    }
    this.height = height;

    if (GameLib.Utils.UndefinedOrNull(widthSegments)) {
        widthSegments = 1;
    }
    this.widthSegments = widthSegments;

    if (GameLib.Utils.UndefinedOrNull(heightSegments)) {
        heightSegments = 1
    }
    this.heightSegments = heightSegments;

	if (GameLib.Utils.UndefinedOrNull(heightMapScale)) {
		heightMapScale = 1;
	}
	this.heightMapScale = heightMapScale;

	if (GameLib.Utils.UndefinedOrNull(isHeightMap)) {
		isHeightMap = false;
	}
	this.isHeightMap = isHeightMap;

	GameLib.D3.Mesh.call(
        this,
        this.graphics,
        apiMesh
    );
};

GameLib.D3.Mesh.Plane.prototype = Object.create(GameLib.D3.Mesh.prototype);
GameLib.D3.Mesh.Plane.prototype.constructor = GameLib.D3.Mesh.Plane;


GameLib.D3.Mesh.Plane.prototype.createInstance = function() {

    var geometry = null;

    /**
     * If this geometry is not coming from the database, apply the vertex data from the instance to our runtime object
     */
    if (this.vertices.length === 0) {

		geometry = new THREE.PlaneGeometry(
			this.width,
			this.height,
			this.widthSegments,
			this.heightSegments
		);

		this.updateVerticesFromGeometryInstance(geometry);

		this.materials.push(
			new GameLib.D3.Material(
				this.graphics,
				new GameLib.D3.API.Material(
					null,
					GameLib.D3.Material.MATERIAL_TYPE_STANDARD,
					'Material Plane ' + this.id
				)
			)
		)
    }

	/**
	 * If this is a heightmap - first generate the z-coordinates
	 */
	if (this.isHeightMap) {
		this.generateHeightMapFromBumpMap();
	}

	/**
	 * Now construct the mesh instance
	 */
	var instance = GameLib.D3.Mesh.prototype.createInstance.call(this);

	/**
	 * Apply some plane specific data to the instance
	 */
	instance.userData.width = this.width;
    instance.userData.height = this.height;
    instance.userData.widthSegments = this.widthSegments;
    instance.userData.heightSegments = this.heightSegments;
    instance.userData.heightMapScale = this.heightMapScale;
    instance.userData.isHeightMap = this.isHeightMap;

    return instance;
};

/**
 *
 */
GameLib.D3.Mesh.Plane.prototype.updateInstance = function() {

	var geometry = null;

    if (
        this.instance.userData.width  !== this.width ||
        this.instance.userData.height !== this.height ||
        this.instance.userData.widthSegments !== this.widthSegments ||
        this.instance.userData.heightSegments !== this.heightSegments ||
		this.instance.userData.isHeightMap !== this.isHeightMap ||
		this.instance.userData.heightMapScale !== this.heightMapScale
    ) {
		this.instance.userData.width = this.width;
		this.instance.userData.height = this.height;
		this.instance.userData.widthSegments = this.widthSegments;
		this.instance.userData.heightSegments = this.heightSegments;
		this.instance.userData.isHeightMap = this.isHeightMap;
		this.instance.userData.heightMapScale = this.heightMapScale;

		geometry = new THREE.PlaneGeometry(
            this.width,
            this.height,
            this.widthSegments,
            this.heightSegments
        );

        this.updateVerticesFromGeometryInstance(geometry);

        if (this.isHeightMap) {
        	this.generateHeightMapFromBumpMap();
		}

		geometry = this.createInstanceGeometry();

        this.instance.geometry = geometry;
	}

    GameLib.D3.Mesh.prototype.updateInstance.call(this);
};

/**
 * Converts a GameLib.D3.Mesh to a GameLib.D3.API.Mesh
 * @returns {GameLib.D3.API.Mesh}
 */
GameLib.D3.Mesh.Plane.prototype.toApiObject = function() {

    var apiMesh = GameLib.D3.Mesh.prototype.toApiObject.call(this);

    apiMesh.width = this.width;
    apiMesh.height = this.height;
    apiMesh.widthSegments = this.widthSegments;
    apiMesh.heightSegments = this.heightSegments;
    apiMesh.heightMapScale = this.heightMapScale;
    apiMesh.isHeightMap = this.isHeightMap;

    return apiMesh;
};

/**
 * TODO fix all this weird loading shit
 * Converts a standard object mesh to a GameLib.D3.Mesh
 * @param graphics GameLib.D3.Graphics
 * @param objectMesh {Object}
 * @constructor
 */
GameLib.D3.Mesh.Plane.FromObject = function(graphics, objectMesh) {

    var apiMesh = GameLib.D3.API.Mesh.FromObject(objectMesh);

    return new GameLib.D3.Mesh.Plane(
        graphics,
        apiMesh,
        objectMesh.width,
        objectMesh.height,
        objectMesh.widthSegments,
        objectMesh.heightSegments,
		objectMesh.heightMapScale,
		objectMesh.isHeightMap
    );

};

GameLib.D3.Mesh.Plane.prototype.getHeightData = function() {

	var i;

	var img = this.materials.reduce(
		function(result, material) {
			if (
				material.bumpMap &&
				material.bumpMap.image &&
				material.bumpMap.image.instance
			) {
				result = material.bumpMap.image.instance;
			}

			return result;
		},
		null
	);

	if (!img) {
		throw new Error('bumpmap image not found');
	}

	var canvas = document.createElement( 'canvas' );
	canvas.width = img.width;
	canvas.height = img.height;
	var context = canvas.getContext( '2d' );

	var size = img.width * img.height;
	var data = new Float32Array( size );

	context.drawImage(img,0,0);

	for (i = 0; i < size; i ++ ) {
		data[i] = 0
	}

	var imgd = context.getImageData(0, 0, img.width, img.height);
	var pix = imgd.data;

	var j=0;
	for (i = 0; i<pix.length; i +=4) {
		var all = pix[i]+pix[i+1]+pix[i+2];
		data[j++] = all/(12*this.heightMapScale);
	}

	return data;

};

/**
 *
 * @returns {THREE.PlaneGeometry}
 */
GameLib.D3.Mesh.Plane.prototype.generateHeightMapFromBumpMap = function() {

    var data = this.getHeightData();

    this.vertices.map(
        function(vertex, index) {
            vertex.position.z = data[index];
        }
    );

    // var geometry = this.createInstanceGeometry();
	//
    // this.instance.geometry = geometry;

    //
    // var vertices = this.instance.geometry.attributes.position.array;
	//
    // for ( var i = 0; i < vertices.length; i += 3 ) {
		// vertices[i+2] = data[i];
    // }
	//
    // this.instance.geometry.attributes.position.needsUpdate = true;

    //this.updateVerticesFromGeometryInstance(this.instance.geometry);

    // this.updateInstance();
};