export default class TextureHook {

	public createdTextures:Array<any> = new Array<any>();
	public maxTexturesCount:number = 0;

	public isInit:boolean = false;
	private realGLCreateTexture:Function = function(){};
	private realGLDeleteTexture:Function = function(){};

	private gl:any;

	constructor(_gl?:any) {

		if(_gl ){

			if(_gl.__proto__.createTexture){
				this.gl = _gl;
				this.realGLCreateTexture = _gl.__proto__.createTexture;
				this.realGLDeleteTexture = _gl.__proto__.deleteTexture;
				//replace to new function
				_gl.__proto__.createTexture = this.fakeGLCreateTexture.bind(this);
				_gl.__proto__.deleteTexture = this.fakeGLDeleteTexture.bind(this);

				this.isInit = true;

				console.log("[TextureHook] GL was Hooked!");
			}

		} else {
			console.error("[TextureHook] GL can't be NULL");
		}
	}

	public get currentTextureCount():number{
		return this.createdTextures.length;
	}

	public registerTexture(texture:any):void {
		this.createdTextures.push(texture);// ++;
		this.maxTexturesCount = Math.max(this.createdTextures.length, this.maxTexturesCount);
	}

	private fakeGLCreateTexture():any {

		var texture = this.realGLCreateTexture.call(this.gl);
		this.registerTexture(texture);
		return texture;
	}



	private fakeGLDeleteTexture(texture:any):void {
		var index:number = this.createdTextures.indexOf(texture);
		if(index > -1)
		{
			this.createdTextures.splice(index, 1);
		}

		this.realGLDeleteTexture.call(this.gl, texture);
	}
	public reset():void{
		this.createdTextures = new Array<any>();
		this.maxTexturesCount = 0;
	}
	public release():void{

		if(this.isInit){

			this.gl.__proto__.createTexture = this.realGLCreateTexture;
			this.gl.__proto__.deleteTexture = this.realGLDeleteTexture;

			console.log("[TextureHook] Hook was removed!");
		}

		this.isInit = false;
	}
}