/**
 * Renders a scene with a camera
 * @param graphics GameLib.D3.Graphics
 * @param apiPass GameLib.D3.API.Pass
 * @constructor
 */
GameLib.D3.Pass = function (
    graphics,
    apiPass
) {

    this.graphics = graphics;
    this.graphics.isNotThreeThrow();

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

	if (apiPass instanceof GameLib.D3.Pass) {
		return apiPass;
	}

    GameLib.D3.API.Pass.call(
        this,
        apiPass.id,
        apiPass.name,
        apiPass.passType,
        apiPass.camera,
        apiPass.scene,
        apiPass.renderToScreen,
        apiPass.parentEntity
    );

    this.buildIdToObject();

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

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

GameLib.D3.Pass.PASS_TYPE_RENDER       = 0x1;
GameLib.D3.Pass.PASS_TYPE_COPY_SHADER  = 0x2;

/**
 * Create Pass instance
 * @param update
 * @returns {*}
 */
GameLib.D3.Pass.prototype.createInstance = function(update) {

    var instance = null;

    if (update) {
        instance = this.instance;
    }

    if (this.passType == GameLib.D3.Pass.PASS_TYPE_RENDER) {

        if (this.scene && this.camera) {
            if (!THREE.RenderPass) {
                console.warn('No THREE.RenderPass');
                throw new Error('No THREE.RenderPass');
            }

            instance = new THREE.RenderPass(
                this.scene.instance,
                this.camera.instance
            );
        }

    } else if (this.passType == GameLib.D3.Pass.PASS_TYPE_COPY_SHADER) {

        if (!THREE.CopyShader) {
            console.warn('No THREE.CopyShader');
            throw new Error('No THREE.CopyShader');
        }

        instance = THREE.CopyShader;

    } else {
        console.warn('Render pass not supported yet: ' + this.passType);
        throw new Error('Render pass not supported yet: ' + this.passType);
    }

    if (instance) {
        instance.renderToScreen = this.renderToScreen;
    }

    return instance;
};

/**
 * Update Pass instance
 */
GameLib.D3.Pass.prototype.updateInstance = function() {
    this.instance = this.createInstance(true);
};

/**
 * GameLib.D3.Pass to GameLib.D3.API.Pass
 * @returns {GameLib.D3.API.Pass}
 */
GameLib.D3.Pass.prototype.toApiComponent = function() {

    var apiPass = new GameLib.D3.API.Pass(
        this.id,
        this.name,
        this.passType,
        GameLib.Utils.IdOrNull(this.camera),
        GameLib.Utils.IdOrNull(this.scene),
        this.renderToScreen,
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

    return apiPass;
};

/**
 * GameLib.D3.Pass from Object
 * @param graphics
 * @param objectComponent
 * @returns {GameLib.D3.Pass}
 * @constructor
 */
GameLib.D3.Pass.FromObjectComponent = function(graphics, objectComponent) {

    var apiPass = GameLib.D3.API.Pass.FromObjectComponent(objectComponent);

    return new GameLib.D3.Pass(
        graphics,
        apiPass
    );
};