namespace TSE {

    export class Sprite {
        protected _buffer: GLBuffer;

        protected _width: number;
        protected _height: number;
        protected _name: string;

        protected _material: Material;
        protected _vertices: Vertex[] = [];

        public constructor(name: string, materialName: string, width: number = 100, height: number = 100) {
            this._name = name;
            this._width = width;
            this._height = height;
            this._material = MaterialManager.getMaterial(materialName);
        }

        public load(): void {
            this._buffer = new GLBuffer();

            this._buffer.addAttributeLocation(new AttributeInfo(0, 3)); //Position
            this._buffer.addAttributeLocation(new AttributeInfo(1, 2)); //UVs

            this._vertices = [
                new Vertex(0, 0, 0, 0, 0),
                new Vertex(0, this._height, 0, 0, 1.0),
                new Vertex(this._width, this._height, 0, 1.0, 1.0),

                new Vertex(this._width, this._height, 0, 1.0, 1.0),
                new Vertex(this._width, 0, 0, 1.0, 0),
                new Vertex(0, 0, 0, 0, 0)
            ];

            this._buffer.pushBackData(Vertex.vertexArray(this._vertices));
            this._buffer.upload();
            this._buffer.unbind();
        }

        public destroy(): void {
            this._buffer.destroy();
            MaterialManager.releaseMaterial(this._material.name);
            delete this._material;
        }

        public update(time: number): void {

        }

        public draw(shader: Shader, model: Matrix4x4): void {
            let modelLocation = shader.getUniformLocation("u_model");
            gl.uniformMatrix4fv(modelLocation, false, model.toFloat32Array());

            let colorLocation = shader.getUniformLocation("u_tint");
            gl.uniform4fv(colorLocation, this._material.tint.toFloat32Array());

            if (this._material.diffuseTexture !== undefined) {
                this._material.diffuseTexture.activateAndBind(0);
                let diffuseLocation = shader.getUniformLocation("u_diffuse");
                gl.uniform1i(diffuseLocation, 0);
            }

            this._buffer.bind();
            this._buffer.draw();
        }

        public get name(): string { return this._name; }

    }

    export class AnimatedSprite extends Sprite {

        private _frameHeight: number;
        private _frameWidth: number;
        private _frameCount: number;
        private _frameSequence: number[];

        private _currentFrame: number = 0;
        private currentTime: number = 0;
        private _frameTime: number = 300;
        private _frameUVs: Vector2[][];
        private _loaded: boolean = false;

        public constructor(name: string, materialName: string, frameWidth: number = 10, frameHeight: number = 10, frameCount: number = 1, frameSequence: number[] = []) {
            super(name, materialName, frameWidth, frameHeight);
            this._frameWidth = frameWidth;
            this._frameHeight = frameHeight;
            this._frameCount = frameCount;
            this._frameSequence = frameSequence;
        }

        public load() {
            super.load();
            this.calculateUVs();
        }

        private calculateUVs(): void {
            setTimeout(() => {
                this._frameUVs = [];

                let totalWidth: number = 0;
                let totalHeight: number = 0;
                for (let i = 0; i < this._frameCount; i++) {
                    totalWidth += this._frameWidth;
                    if (totalWidth > this._material.diffuseTexture.width) {
                        totalWidth = 0;
                        totalHeight++;
                    }

                    const u = (i * this._frameWidth) / this._material.diffuseTexture.width;
                    const v = (totalHeight * this._frameHeight) / this._material.diffuseTexture.height;
                    const um = ((i * this._frameWidth) + this._frameWidth) / this._material.diffuseTexture.width;
                    const vm = ((totalHeight * this._frameHeight) + this._frameHeight) / this._material.diffuseTexture.height;
                    this._frameUVs.push([new Vector2(u, v), new Vector2(um, vm)]);
                }
                this._loaded = true;
            }, 0);
        }

        public update(time: number) {
            if (!this._loaded) return;
            this.currentTime += time;
            if (this.currentTime > this._frameTime) {
                this._currentFrame++;
                this.currentTime = 0;

                if (this._currentFrame >= this._frameSequence.length)
                    this._currentFrame = 0;

                const frameUVs = this._frameUVs[this._frameSequence[this._currentFrame]];

                this._vertices[0].texCoords.copyFrom(frameUVs[0]);
                this._vertices[1].texCoords = new Vector2(frameUVs[0].x, frameUVs[1].y);
                this._vertices[2].texCoords.copyFrom(frameUVs[1]);

                this._vertices[3].texCoords.copyFrom(frameUVs[1]);
                this._vertices[4].texCoords = new Vector2(frameUVs[1].x, frameUVs[0].y);
                this._vertices[5].texCoords.copyFrom(frameUVs[0]);

                this._buffer.setData(Vertex.vertexArray(this._vertices));
                this._buffer.upload();
                this._buffer.unbind();
            }

            super.update(time);
        }

    }

}