/**
 * Texture Superset - The apiTexture properties get moved into the Texture object itself, and then the instance is
 * created
 * @param apiTexture
 * @param graphics GameLib.D3.Graphics
 * @constructor
 */
GameLib.D3.Texture = function(
    graphics,
    apiTexture
) {
    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

    if (GameLib.Utils.UndefinedOrNull(apiTexture)) {
        apiTexture = {};
    }

	if (apiTexture instanceof GameLib.D3.Texture) {
		return apiTexture;
	}

    GameLib.D3.API.Texture.call(
        this,
		apiTexture.id,
		apiTexture.typeId,
		apiTexture.name,
		apiTexture.image,
		apiTexture.wrapS,
		apiTexture.wrapT,
		apiTexture.repeat,
		apiTexture.data,
		apiTexture.format,
		apiTexture.mapping,
		apiTexture.magFilter,
		apiTexture.minFilter,
		apiTexture.textureType,
		apiTexture.anisotropy,
		apiTexture.offset,
		apiTexture.generateMipmaps,
		apiTexture.flipY,
		apiTexture.mipmaps,
		apiTexture.unpackAlignment,
		apiTexture.premultiplyAlpha,
		apiTexture.encoding,
        apiTexture.parentEntity
    );

    this.offset = new GameLib.Vector2(
        this.graphics,
        this.offset,
        this
    );

    this.repeat = new GameLib.Vector2(
        this.graphics,
        this.repeat,
        this
    );

    if (this.image instanceof GameLib.D3.API.Image) {
        this.image = new GameLib.D3.Image(
            this.graphics,
            this.image
        );
    }

    this.instance = this.createInstance();
};

GameLib.D3.Texture.prototype = Object.create(GameLib.D3.API.Texture.prototype);
GameLib.D3.Texture.prototype.constructor = GameLib.D3.Texture;

/**
 * Texture Formats
 * @type {number}
 */
GameLib.D3.Texture.TYPE_ALPHA_FORMAT = 1019;
GameLib.D3.Texture.TYPE_RGB_FORMAT = 1020;
GameLib.D3.Texture.TYPE_RGBA_FORMAT = 1021;
GameLib.D3.Texture.TYPE_LUMINANCE_FORMAT = 1022;
GameLib.D3.Texture.TYPE_LUMINANCE_ALPHA_FORMAT = 1023;
GameLib.D3.Texture.TYPE_DEPTH_FORMAT = 1026;

/**
 * Mapping modes
 * @type {number}
 */
GameLib.D3.Texture.TYPE_UV_MAPPING = 300;
GameLib.D3.Texture.TYPE_CUBE_REFLECTION_MAPPING = 301;
GameLib.D3.Texture.TYPE_CUBE_REFRACTION_MAPPING = 302;
GameLib.D3.Texture.TYPE_EQUI_RECTANGULAR_REFLECTION_MAPPING = 303;
GameLib.D3.Texture.TYPE_EQUI_RECTANGULAR_REFRACTION_MAPPING = 304;
GameLib.D3.Texture.TYPE_SPHERICAL_REFLECTION_MAPPING = 305;
GameLib.D3.Texture.TYPE_CUBE_UV_REFLECTION_MAPPING = 306;
GameLib.D3.Texture.TYPE_CUBE_UV_REFRACTION_MAPPING = 307;

/**
 * Wrapping Modes
 * @type {number}
 */
GameLib.D3.Texture.TYPE_REPEAT_WRAPPING = 1000;
GameLib.D3.Texture.TYPE_CLAMP_TO_EDGE_WRAPPING = 1001;
GameLib.D3.Texture.TYPE_MIRRORED_REPEAT_WRAPPING = 1002;

/**
 * Mipmap Filters
 * @type {number}
 */
GameLib.D3.Texture.TYPE_NEAREST_FILTER = 1003;
GameLib.D3.Texture.TYPE_NEAREST_MIPMAP_NEAREST_FILTER = 1004;
GameLib.D3.Texture.TYPE_NEAREST_MIPMAP_LINEAR_FILTER = 1005;
GameLib.D3.Texture.TYPE_LINEAR_FILTER = 1006;
GameLib.D3.Texture.TYPE_LINEAR_MIPMAP_NEAREST_FILTER = 1007;
GameLib.D3.Texture.TYPE_LINEAR_MIPMAP_LINEAR_FILTER = 1008;

/**
 * Texture Data Types
 * @type {number}
 */
GameLib.D3.Texture.TYPE_UNSIGNED_BYTE = 1009;
GameLib.D3.Texture.TYPE_BYTE = 1010;
GameLib.D3.Texture.TYPE_SHORT = 1011;
GameLib.D3.Texture.TYPE_UNSIGNED_SHORT = 1012;
GameLib.D3.Texture.TYPE_INT = 1013;
GameLib.D3.Texture.TYPE_UNSIGNED_INT = 1014;
GameLib.D3.Texture.TYPE_FLOAT = 1015;
GameLib.D3.Texture.TYPE_HALF_FLOAT = 1025;

/**
 * Encoding Modes
 * @type {number}
 */
GameLib.D3.Texture.TYPE_LINEAR_ENCODING = 3000; // NO ENCODING AT ALL.
GameLib.D3.Texture.TYPE_SRGB_ENCODING = 3001;
GameLib.D3.Texture.TYPE_GAMMA_ENCODING = 3007; // USES GAMMA_FACTOR, FOR BACKWARDS COMPATIBILITY WITH WEBGLRENDERER.GAMMAINPUT/GAMMAOUTPUT
GameLib.D3.Texture.TYPE_RGBE_ENCODING = 3002; // AKA RADIANCE.
GameLib.D3.Texture.TYPE_LOG_LUV_ENCODING = 3003;
GameLib.D3.Texture.TYPE_RGBM7_ENCODING = 3004;
GameLib.D3.Texture.TYPE_RGBM16_ENCODING = 3005;
GameLib.D3.Texture.TYPE_RGBD_ENCODING = 3006; // MAXRANGE IS 256.

GameLib.D3.Texture.TEXTURE_TYPE_NORMAL      = 0x1;
GameLib.D3.Texture.TEXTURE_TYPE_CUBE        = 0x2;


// GameLib.D3.Texture.TEXTURE_TYPE_ALPHA       = 'alpha';
// GameLib.D3.Texture.TEXTURE_TYPE_AO          = 'ao';
// GameLib.D3.Texture.TEXTURE_TYPE_BUMP        = 'bump';
// GameLib.D3.Texture.TEXTURE_TYPE_DIFFUSE     = 'diffuse';
// GameLib.D3.Texture.TEXTURE_TYPE_DISPLACEMENT = 'displacement';
// GameLib.D3.Texture.TEXTURE_TYPE_EMISSIVE    = 'emissive';
// GameLib.D3.Texture.TEXTURE_TYPE_ENVIRONMENT = 'environment';
// GameLib.D3.Texture.TEXTURE_TYPE_LIGHT       = 'light';
// GameLib.D3.Texture.TEXTURE_TYPE_METALNESS   = 'metalness';
// GameLib.D3.Texture.TEXTURE_TYPE_NORMAL      = 'normal';
// GameLib.D3.Texture.TEXTURE_TYPE_ROUGHNESS   = 'roughness';
// GameLib.D3.Texture.TEXTURE_TYPE_SPECULAR    = 'specular';

/**
 * Creates an instance of our texture object
 * @param update
 * @returns {*}
 */
GameLib.D3.Texture.prototype.createInstance = function(update) {

    if (update) {

        if (!this.instance) {
            console.warn('trying to update a non-existent texture instance');
            return;
        }

        if (GameLib.Utils.UndefinedOrNull(this.image.instance)) {
            console.warn('trying to update while no image instance');
            return;
        }

        this.instance.name       = this.name;
        this.instance.flipY      = this.flipY;
        this.instance.encoding   = this.encoding;
        this.instance.offset.x   = this.offset.x;
        this.instance.offset.y   = this.offset.y;
        this.instance.repeat.x   = this.repeat.x;
        this.instance.repeat.y   = this.repeat.y;
        this.instance.mapping    = this.mapping;
        this.instance.format     = this.format;
        this.instance.wrapS      = this.wrapS;
        this.instance.wrapT      = this.wrapT;

        this.publish(
            GameLib.Event.TEXTURE_LOADED,
            {
                texture : this
            }
        );

        this.instance.needsUpdate = true;

    } else {

        if (this.image instanceof GameLib.D3.Image) {

            if (this.image.instance) {

                var instance = new THREE.Texture(
                    this.image.instance
                );
                instance.name       = this.name;
                instance.flipY      = this.flipY;
                instance.encoding   = this.encoding;
                instance.offset.x   = this.offset.x;
                instance.offset.y   = this.offset.y;
                instance.repeat.x   = this.repeat.x;
                instance.repeat.y   = this.repeat.y;
                instance.mapping    = this.mapping;
                instance.format     = this.format;
				instance.wrapS      = this.wrapS;
				instance.wrapT      = this.wrapT;

				this.publish(
                    GameLib.Event.TEXTURE_LOADED,
                    {
                        texture : this
                    }
                );

                return instance;
            }
        }

        this.subscribe(
            GameLib.Event.IMAGE_LOADED,
            function (data) {

                /**
                 * Only work with images that belong to this texture
                 */
                if (data.imagePath === this.image.path) {

                    if (!(this.image instanceof GameLib.D3.Image)) {
                        if (!data.cubeTexture) {
                            console.warn('The image associated with this texture has not been setup properly - objects linked?');
                            return;
                        }
                    }

                    var instance = null;

                    if (data.cubeTexture) {

                        instance = data.cubeTexture;

                        if (this.mapping !== GameLib.D3.Texture.TYPE_CUBE_REFLECTION_MAPPING &&
							this.mapping !== GameLib.D3.Texture.TYPE_CUBE_REFRACTION_MAPPING
                        ) {
                            this.mapping = GameLib.D3.Texture.TYPE_CUBE_REFLECTION_MAPPING;
                        }

                    } else {

						instance = new THREE.Texture(
							data.imageInstance
						);

						if (this.mapping !== GameLib.D3.Texture.TYPE_UV_MAPPING) {
							this.mapping = GameLib.D3.Texture.TYPE_UV_MAPPING;
						}
					}

					instance.name       = this.name;
					instance.flipY      = this.flipY;
					instance.encoding   = this.encoding;
					instance.offset.x   = this.offset.x;
					instance.offset.y   = this.offset.y;
					instance.repeat.x   = this.repeat.x;
					instance.repeat.y   = this.repeat.y;
					instance.mapping    = this.mapping;
					instance.format     = this.format;
					instance.wrapS      = this.wrapS;
					instance.wrapT      = this.wrapT;

					this.instance = instance;

                    this.publish(
                        GameLib.Event.TEXTURE_LOADED,
                        {
                            texture : this
                        }
                    );

                    this.instance.needsUpdate = true;
                }
            }
        );

        this.subscribe(
            GameLib.Event.IMAGE_CHANGE,
            function (data) {

                var instance = null;

                if (this.image === null) {
                    instance = new THREE.Texture();
                } else {
                    instance = new THREE.Texture(this.image.instance);
                    // instance.needsUpdate = true;
                    // instance.name       = this.name;
                    // instance.flipY      = this.flipY;
                    // instance.encoding   = this.encoding;
                    // instance.offset.x   = this.offset.x;
                    // instance.offset.y   = this.offset.y;
                    // instance.repeat.x   = this.repeat.x;
                    // instance.repeat.y   = this.repeat.y;
                    // this.format = instance.format;
                }

                this.instance = instance;

                this.publish(
                    GameLib.Event.TEXTURE_LOADED,
                    {
                        texture : this
                    }
                );

            }
        );

        return null;
    }
};

/**
 * Updates the instance with the current state
 */
GameLib.D3.Texture.prototype.updateInstance = function() {
    this.createInstance(true);
};

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

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

    var apiImage = null;
    if (this.image) {
        if (save) {
            this.image.save();
        }
        apiImage = this.image.id
    }

    var apiTexture = new GameLib.D3.API.Texture(
        this.id,
        this.typeId,
        this.name,
        apiImage,
        this.wrapS,
        this.wrapT,
        this.repeat.toApiObject(),
        this.data,
        this.format,
        this.mapping,
        this.magFilter,
        this.minFilter,
        this.textureType,
        this.anisotropy,
        this.offset.toApiObject(),
        this.generateMipmaps,
        this.flipY,
        this.mipmaps,
        this.unpackAlignment,
        this.premultiplyAlpha,
        this.encoding,
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

    return apiTexture;

};

/**
 * Converts from an Object texture to a GameLib.D3.Texture
 * @param graphics GameLib.D3.Graphics
 * @param objectTexture Object
 * @constructor
 */
GameLib.D3.Texture.FromObject = function(
    graphics,
    objectTexture
) {
    var apiTexture = GameLib.D3.API.Texture.FromObject(objectTexture);

    return new GameLib.D3.Texture(
        graphics,
        apiTexture
    );
};