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

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

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

	if (apiRenderer instanceof GameLib.D3.Renderer) {
		return apiRenderer;
	}

    GameLib.D3.API.Renderer.call(
        this,
        apiRenderer.id,
        apiRenderer.name,
        apiRenderer.autoClear,
        apiRenderer.localClipping,
        apiRenderer.width,
        apiRenderer.height,
        apiRenderer.preserveDrawingBuffer,
        apiRenderer.domElement,
        apiRenderer.clearColor,
        apiRenderer.camera,
        apiRenderer.scenes,
        apiRenderer.viewports,
        apiRenderer.clippingPlanes,
        apiRenderer.bufferScene,
        apiRenderer.bufferCamera,
        apiRenderer.renderTarget,
        apiRenderer.defaultScene,
        apiRenderer.sortObjects,
        apiRenderer.parentEntity
    );

    this.clearColor = new GameLib.Color(
        this.graphics,
        this.clearColor,
        this
    );

    if (this.domElement instanceof GameLib.API.DomElement) {
        this.domElement = new GameLib.DomElement(
            this.domElement
        );
    }

    if (this.camera instanceof GameLib.D3.API.Camera) {
        this.camera = new GameLib.D3.Camera(
            this.graphics,
            this.camera
        )
    }

    this.scenes = this.scenes.map(function(scene){
        if (scene instanceof GameLib.D3.API.Scene) {
            return new GameLib.D3.Scene(
                this.graphics,
                scene
            );
        } else {
            return scene;
        }
    }.bind(this));

	this.viewports = this.viewports.map(function(viewport){
		if (viewport instanceof GameLib.D3.API.Viewport) {
			return new GameLib.D3.Viewport(
				this.graphics,
				viewport
			);
		} else {
			return viewport;
		}
	}.bind(this));

    this.clippingPlanes = this.clippingPlanes.map(function(clippingPlane){
        if (clippingPlane instanceof GameLib.D3.API.Mesh) {
            return new GameLib.D3.Mesh.Plane(
                this.graphics,
                clippingPlane,
                clippingPlane.width,
                clippingPlane.height,
                clippingPlane.widthSegments,
                clippingPlane.heightSegments,
                clippingPlane.heightMapScale,
                clippingPlane.isHeightMap,
                clippingPlane.isClippingPlane,
                clippingPlane.distanceFromOrigin
            );
        } else {
            return clippingPlane;
        }
    }.bind(this));

    if (this.bufferScene instanceof GameLib.D3.API.Scene) {
        this.bufferScene = new GameLib.D3.Scene(
            this.graphics,
            this.bufferScene
        )
    }

    if (this.bufferCamera instanceof GameLib.D3.API.Camera) {
        this.bufferCamera = new GameLib.D3.Camera(
            this.graphics,
            this.bufferCamera
        )
    }

    if (this.renderTarget instanceof GameLib.D3.API.RenderTarget) {
        this.renderTarget = new GameLib.D3.RenderTarget(
            this.graphics,
            this.renderTarget
        )
    }

    GameLib.Component.call(
        this,
        GameLib.Component.COMPONENT_RENDERER,
        {
            'domElement'    : GameLib.DomElement,
            'camera'        : GameLib.D3.Camera,
            'scenes'        : [GameLib.D3.Scene],
            'viewports'     : [GameLib.D3.Viewport],
            'clippingPlanes': [GameLib.D3.Mesh.Plane],
            'bufferScene'   : GameLib.D3.Scene,
            'bufferCamera'  : GameLib.D3.Camera,
            'renderTarget'  : GameLib.D3.RenderTarget,
            'defaultScene'  : GameLib.D3.Scene
        }
    );

};

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

/**
 * Create Renderer Instance
 * @returns {*}
 */
GameLib.D3.Renderer.prototype.createInstance = function() {

    if (GameLib.Utils.UndefinedOrNull(this.domElement)) {
        throw new Error('no dom element');
    }

    if (GameLib.Utils.UndefinedOrNull(this.domElement.instance)) {
        throw new Error('no dom element instance');
    }

    this.instance = new THREE.WebGLRenderer(
        {
            canvas : this.domElement.instance
        }
    );

    if (this.clippingPlanes.length > 0) {
        this.instance.clippingPlanes = this.clippingPlanes.map(
            function(clippingPlane) {

                if (!clippingPlane.isClippingPlane || !clippingPlane.instance || !clippingPlane.instance.clipping) {
                    throw new Error('is not a clipping plane or no clipping plane instance');
                }

                return clippingPlane.instance.clipping;
            }
        )
    }

    this.instance.localClippingEnabled = this.localClipping;

    this.instance.setSize(
        this.width,
        this.height
    );

    this.instance.setClearColor(
        new THREE.Color(
            this.clearColor.r,
            this.clearColor.g,
            this.clearColor.b
        ),
        1 - this.clearColor.a
    );

    this.instance.domElement.width = this.width;
    this.instance.domElement.height = this.height;

    this.instance.autoClear = this.autoClear;
    this.instance.preserveDrawingBuffer = this.preserveDrawingBuffer;

    this.instance.sortObjects = this.sortObjects;

    GameLib.Component.prototype.createInstance.call(this);

};

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

    if (!this.instance) {
        try {
            this.createInstance();
        } catch (error) {
            console.error(error.message);
            return;
        }
    }

    this.instance.localClippingEnabled = this.localClipping;

    this.instance.setSize(
        this.width,
        this.height
    );

    this.instance.setClearColor(
        new THREE.Color(
            this.clearColor.r,
            this.clearColor.g,
            this.clearColor.b
        ),
        1 - this.clearColor.a
    );

    this.instance.domElement.width = this.width;
    this.instance.domElement.height = this.height;

    this.instance.autoClear = this.autoClear;
    this.instance.preserveDrawingBuffer = this.preserveDrawingBuffer;

    if (this.clippingPlanes.length > 0) {
        this.instance.clippingPlanes = this.clippingPlanes.map(
            function(clippingPlane) {

                if (!clippingPlane.isClippingPlane || !clippingPlane.instance || !clippingPlane.instance.clipping) {
                    throw new Error('is not a clipping plane or no clipping plane instance');
                }

                return clippingPlane.instance.clipping;
            }
        )
    } else {
        this.instance.clippingPlanes = [];
    }

    this.instance.sortObjects = this.sortObjects;
};

/**
 *
 * @returns {GameLib.D3.API.Renderer}
 */
GameLib.D3.Renderer.prototype.toApiObject = function() {

    var apiRenderer = new GameLib.D3.API.Renderer(
        this.id,
        this.name,
        this.autoClear,
        this.localClipping,
        this.width,
        this.height,
        this.preserveDrawingBuffer,
        GameLib.Utils.IdOrNull(this.domElement),
        this.clearColor.toApiObject(),
        GameLib.Utils.IdOrNull(this.camera),
        this.scenes.map(function(scene){
            return GameLib.Utils.IdOrNull(scene);
        }),
        this.viewports.map(function(viewport){
            return GameLib.Utils.IdOrNull(viewport);
        }),
        this.clippingPlanes.map(
            function(clippingPlane) {
                return GameLib.Utils.IdOrNull(clippingPlane);
            }
        ),
        GameLib.Utils.IdOrNull(this.bufferScene),
        GameLib.Utils.IdOrNull(this.bufferCamera),
        GameLib.Utils.IdOrNull(this.renderTarget),
        GameLib.Utils.IdOrNull(this.defaultScene),
        this.sortObjects,
        GameLib.Utils.IdOrNull(this.parentEntity)
    );

    return apiRenderer;
};

/**
 *
 * @param graphics
 * @param objectComponent
 * @returns {GameLib.D3.Renderer}
 * @constructor
 */
GameLib.D3.Renderer.FromObject = function(graphics, objectComponent) {

    var apiRenderer = GameLib.D3.API.Renderer.FromObject(objectComponent);

    return new GameLib.D3.Renderer(
        graphics,
        apiRenderer
    );
};

/**
 * Convenience render function
 */
GameLib.D3.Renderer.prototype.render = function(delta, scenes) {

	if (!this.instance) {
		return;
	}

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

	if (this.viewports.length > 1) {
		this.instance.autoClear = false;
	}

	if (scenes.length > 1) {
		this.instance.autoClear = false;
	}

    this.instance.clear();

    if (
        this.bufferScene &&
        this.bufferScene.instance &&
        this.bufferCamera &&
        this.bufferCamera.instance &&
        this.renderTarget &&
        this.renderTarget.instance
    ) {
        /**
         * We have a buffer that should render to an offscreen render target
         */
        this.instance.render(
            this.bufferScene.instance,
            this.bufferCamera.instance,
            this.renderTarget.instance
        );
    }

	this.viewports.map(

		function(viewport) {

			this.instance.setViewport(
				viewport.x * this.width,
				viewport.y * this.height,
				viewport.width * this.width,
				viewport.height * this.height
			);

            scenes.map(function(scene) {

				if (!scene.instance) {
					return;
				}

				if (!this.camera.instance && !(scene.renderCamera || scene.renderCamera.instance)) {
					return;
				}

                /**
                 * A scene's renderCamera instance overrides the default renderer camera
                 */
				if (scene.renderCamera && scene.renderCamera.instance) {
                    this.instance.render(
                        scene.instance,
                        scene.renderCamera.instance
                    )
                } else {
                    this.instance.render(
                        scene.instance,
                        this.camera.instance
                    )
                }

            }.bind(this));

		}.bind(this)
	);

};

GameLib.D3.Renderer.prototype.setSize = function(width, height) {
    this.width = width;
    this.height = height;
    this.updateInstance();
};