/**
 * 	Kepler - Core
 * 	
 * 	All rights reserved.
 *
 * 	Author: Kaj Dijksta
 *
 **/
 
 
import programInfo from './programInfo.js';
import {vector2, vector3} from './math.js';


 
/**
 * ResourceManager object
 */
 class resourceManager{
	 
	constructor( engine ) {
		this.engine = engine;
		this.gl = engine.gl;
		
		this.baseUrl = "http://localhost:4000/";
		this.directory = "media/textures/";
		
		
		this.numberOfModels = 0;
		this.numberOfTextures = 0;
		this.textureTotal = 0;
		
		this.textures = [];
		this.models = [];
		this.shaders = [];
		
		this.finishCallback;
		this.loadingList = [];
		
		this.fileCache = [];
		this.programCashe = [];
	}


	/**
	 * add program 
	 * @param {string} url 
	 */
	loadShader( url ) {
		var shader = new shader();
		
		shader.createFomFile(url);
		
		this.shaders.push(shader);
	}

	getShader( url ) {
		var shaders = this.shaders;
		for(var c = 0; c<shaders.length; c++) {
			if(shaders[c].url == url) {
				
				
				return shaders[c];
			}
		}
		
		console.log("shader "+ url +" not loaded ");
		return false;
	}

	/**
	 * add program 
	 * @param {string} url 
	 */
	addProgram( programInfo ) {
		this.programCashe.push(programInfo);
	}


	/**
	 * get shader program by url and array of pragma's
	 * @param {string} url 
	 */
	getShaderProgram(url, pragmas, librarys) {
		var programInfo = this.createShaderProgram(url, pragmas, librarys);
		
		this.addProgram(programInfo);
		
		return programInfo;
	}


	/**
	 * Create shader program based on shader url and pragma array
	 * @param {string} url 
	 */
	createShaderProgram(url, pragmas, librarys) {

		var rawShaderText = kepler.resources.loadTextFileSynchronous(url, pragmas);
		var splitShader = rawShaderText.split("// #keplerEngine - Split");

		var vertextShaderRawText  = splitShader[0];
		var fragmentShaderRawText = splitShader[1];

		var vertexShader = this.gl.createShader(this.gl.VERTEX_SHADER);
		var fragmentShader = this.gl.createShader(this.gl.FRAGMENT_SHADER);

		for(var c = 0; c<librarys.length; c++) {
			var lib = librarys[c];

			if(lib.type == 0) {
				vertextShaderRawText = lib.content + vertextShaderRawText;
			} else {
				var index = fragmentShaderRawText.indexOf("void main()");
				
				fragmentShaderRawText = insertAt(fragmentShaderRawText, index, lib.content);
				
			}
			
			rawShaderText = lib.content + rawShaderText;
		}
		
		//add pragma's
		for(var c = 0; c<pragmas.length; c++) {
			var currentPragma = pragmas[c];
			
			switch (currentPragma.type) {
				case "define":
				
					var pragma = "#define " + currentPragma.name + " " + currentPragma.value + '    \n  ';
					
						fragmentShaderRawText = pragma + fragmentShaderRawText;
						vertextShaderRawText = pragma + vertextShaderRawText;
					
				break;
			}
		}
		
		var shader_version_3 = fragmentShaderRawText.includes("#version 300 es");
		
		
		if(shader_version_3) {

							
			fragmentShaderRawText = fragmentShaderRawText.replace("#version 300 es",'');
			fragmentShaderRawText = fragmentShaderRawText.replace("#version 300 es",'');
			vertextShaderRawText = vertextShaderRawText.replace("#version 300 es",'');
			vertextShaderRawText = vertextShaderRawText.replace("#version 300 es",'');
			
			fragmentShaderRawText = "#version 300 es \n" + fragmentShaderRawText;
			vertextShaderRawText = "#version 300 es \n" + vertextShaderRawText;
		
		}
		
		
		//console.log(fragmentShaderRawText);
		//console.log(vertextShaderRawText);
		this.rawShader = fragmentShaderRawText + vertextShaderRawText;
		
		this.gl.shaderSource(vertexShader, vertextShaderRawText);
		this.gl.compileShader(vertexShader);
		
		this.gl.shaderSource(fragmentShader, fragmentShaderRawText);
		this.gl.compileShader(fragmentShader);
		
		var program = this.gl.createProgram();
		
		this.gl.attachShader(program, vertexShader);
		this.gl.attachShader(program, fragmentShader);
		
		if (!this.gl.getShaderParameter(vertexShader, this.gl.COMPILE_STATUS)) {
			alert(this.gl.getShaderInfoLog(vertexShader));
			return null;
		}
		
		if (!this.gl.getShaderParameter(fragmentShader, this.gl.COMPILE_STATUS)) {
			alert(this.gl.getShaderInfoLog(fragmentShader));
			return null;
		}

		this.gl.linkProgram(program);

		if (!this.gl.getProgramParameter(program, this.gl.LINK_STATUS)) {
			alert("Could not initialise shaders");
		}

		this.gl.useProgram(program);
		
		var programInfo = {};
		
		programInfo.program = program;
		programInfo.rawData = this.rawShader;
		programInfo.vertextShaderRawText = vertextShaderRawText;
		programInfo.vertexShader = vertexShader;
		programInfo.fragmentShader = fragmentShader;
		programInfo.url = url;
		programInfo.pragmas = pragmas;
		programInfo.librarys = librarys;
		
		console.log('compiled shader: ', programInfo);
		
		return programInfo;
	}


	get_filesize(url, callback) {
		var xhr = new XMLHttpRequest();
		xhr.open("HEAD", url, true); // Notice "HEAD" instead of "GET",
									 //  to get only the header
							
		xhr.onreadystatechange = function(ev) {
			
			if (this.readyState == this.DONE) {

				console.log('ev', ev.target.responseURL);
				var url = ev.target.responseURL;
				var size = parseInt(ev.target.getResponseHeader("Content-Length"));
				//this.engine.loader.add(url, size );
				
			}
		};
		xhr.send();
	}


	/**
	 * load url
	 * @param {string} url 
	 */
	loadTextFileSynchronous(url) {

		///this.get_filesize( url );



		var fileContent = this.engine.resources.getFile(url)
		
		if(fileContent) {
			return fileContent.data;
		}
		
		var request;
		
		

		
		if (window.XMLHttpRequest) {
			request = new XMLHttpRequest();
			if (request.overrideMimeType) {
			  request.overrideMimeType('text/plain');
			}
		} else if (window.ActiveXObject) {
			request = new ActiveXObject('MSXML2.XMLHTTP.3.0');
		} else {
			throw 'XMLHttpRequest is disabled';
		}
		

		
		request.onreadystatechange = function (evt) {
			
			
			
			//this.engine.loader.finish( evt.target.responseURL ); 

		};
		
		request.open('GET', this.baseUrl + url, false);

		
		request.send();
		
		if (request.readyState != 4) {
			throw error;
		}
		
		var data = request.responseText;
		
		if(!fileContent) {
			//this.get_filesize( url );
		}
		
		
		this.addFile(data, url);
		
		
		
		
		return data;
	}


	/**
	 * Add file
	 * @param {string} date (Filedata) 
	 * @param {string} url 
	 */
	addFile(data, url) {
		var file = {};
		
		file.data = data;
		file.url = url;
		
		this.fileCache.push(file);
	}


	/**
	 * Get file
	 * @param {string} url 
	 */
	getFile(url) {
		for(var c = 0; c<this.fileCache.length; c++) {
			var file = this.fileCache[c];
			if(file.url == url)
				return file;
		}
		
		return false;
	}


	/**
	 * Add Texture
	 * @param {string} address
	 * @param {string} name 
	 * @param {boolean} direct 
	 */
	addTexture(adress, name, direct) {
		
		this.numberOfTextures++;
		this.textureTotal++;

		var texture = {};
		
		texture.adress = adress;
		texture.name = name;
		texture.loaded = false;
		
		this.loadingList.push(texture);
		
		if(direct)
			this.loadNextTexture(adress, name);
	};


	/**
	 * Load next texture 
	 */
	loadNextTexture() {

		
		if(this.loadingList.length > 0) {
			var currentTexture = this.loadingList.pop();
			this.loadTexture(currentTexture.adress, currentTexture.name);
		} 
		
		for(var c = 0; c<this.loadingList.length; c++) {
			//var currentTexture = this.loadingList.pop();
			//this.loadTexture(currentTexture.adress, currentTexture.name);
		}
	}

	/**
	 * Load Texture
	 * @param {string} url
	 * @param {string} name 
	 * @param {string} force 
	 */
	loadTexture(url, name, force){
		var parts = url.split('.');
		var extension = parts[parts.length-1];
		
		//this.engine.setLoadingText("loading texture: " + url);
		
		// if texture is compressed
		if(extension == 'dds') {
		
			var image = loadDDSTexture(url, name, function(texture, name, url){
			
				//var texture = this.engine.textureFromDDS( mipmaps );
				texture.name = name;
				texture.url = url;
			
				this.engine.resources.textures.push(texture);
				this.engine.resources.loadNextTexture();
				this.engine.resources.CheckIfAllObjectsTexturesLoaded(texture);
				
			});
		
		} else {

			//this.get_filesize( url );
		
			var  image = new Image();
			
			image.engine = this.engine;

			
			image.onload = function(a) {
				
				//var texture = this.engine.textureFromImage( this, this.width, this.height);
				var texture = {};
				texture.image = this;
				texture.width = this.width;
				texture.height = this.height;
				texture.name = this.name;
				texture.url = this.relativeSrc;
				
				//updateLoadingBarTexture(this.engine.resources.textureTotal,this.engine.resources.textures.length);
				
				this.engine.resources.textures.push(texture);
				
				
				this.engine.resources.loadNextTexture();
				this.engine.resources.CheckIfAllObjectsTexturesLoaded(texture);
				//this.engine.loader.finish( image.src ); 
			}
			
			image.onerror = function (a) {
			
				this.engine.resources.loadNextTexture();
				this.engine.resources.CheckIfAllObjectsTexturesLoaded();
			}
			
			image.name = name;
			image.src = this.baseUrl + url;
			image.relativeSrc = url;
			
			
			
		}
	}

	hasExtension( name ){
		
		var numOfParts = name.split(".").length;
		
		if(numOfParts > 1) {
			return true;
		} else {
			return false;
		}
		
	}
	
	/**
	 * Get texture by name
	 * @param {String} name
	 */
	getTexture( name ) {

		if(this.hasExtension(name)) {
			
			var url = name;
			
			this.addTexture(this.directory + url, name);
		}
		
	
		for(var c = 0;c<this.loadingList.length; c++) {
			if(this.loadingList[c].name == name){
		
				return this.loadingList[c];
				
			}
				
			
			
				
		}
		
		return false;
		
	};
		/**
	 * Get texture by name
	 * @param {String} name
	 */
	getLoadedTexture( name, viewport ) {

		for(var c = 0;c<this.textures.length; c++) {
			if(this.textures[c].name == name){
				
				var textureInfo = this.textures[c];
				
				var texture = this.engine.textureFromImage( textureInfo.image,  viewport );
				return texture;
			}
		}
		
		return false;
		
	};
	


	/**
	 * Check if all objects are loaded
	 */
	CheckIfAllObjectsTexturesLoaded() {
		this.numberOfTextures--;

		if( this.numberOfTextures == 0 ) {
			this.finishCallback();
		}
	};


	/**
	 * copy a array buffer
	 * @param {array} source
	 * @param {array} destination
	 * @param {int} byteofffset
	 * @param {int} number of bytes
	 */
	arrayBufferCopy(src, dst, dstByteOffset, numBytes) {
		var dst32Offset = dstByteOffset / 4,
			tail = (numBytes % 4),
			src32 = new Uint32Array(src.buffer, 0, (numBytes - tail) / 4),
			dst32 = new Uint32Array(dst.buffer),
			i;

		for (i = 0; i < src32.length; i++) {
			dst32[dst32Offset + i] = src32[i];
		}
		for (i = numBytes - tail; i < numBytes; i++) {
			dst[dstByteOffset + i] = src[i];
		}
	}


	/**
	 * load dds texture
	 * @param {string} source
	 * @param {string} name
	 * @param {function} callback
	 */
	loadDDSTexture(src, name, callback) {

		loadDDSTextureEx(src, name, texture, true, callback);
		
		return texture;
	}


	/**
	 * load dds textureEx
	 * @param {string} url
	 * @param {string} name
	 * @param {textureObject} texture
	 * @param {boolean} loadMipmaps
	 * @param {function} callback
	 */
	loadDDSTextureEx( url, name, texture, loadMipmaps, callback) {
		var xhr = new XMLHttpRequest();

		xhr.open('GET', url, true);
		xhr.responseType = "arraybuffer";
		
		
		
		xhr.onload = function (){
		
			if(this.status == 200) {
				var mipmaps = uploadDDSLevels(this.engine.extensions.textureCompression, this.response, loadMipmaps);
				
				texture = new texture();
				
				texture.mipmaps = mipmaps;
				texture.dataType = 'COMPRESSED_RGBA';
			}

			if(callback) {
				callback(texture, name, url);
			}
		};
		
		xhr.send(null);

		return texture;
	}


	/**
	 * Upload DDS Levels
	 * @param {string} ext
	 * @param {arrayBuffer} arrayBuffer
	 * @param {boolean} loadMipmaps
	 * @param {texture} texture
	 */
	uploadDDSLevels(ext, arrayBuffer, loadMipmaps, texture) {

		var DDS_MAGIC = 0x20534444;
		
		var DDSD_CAPS = 0x1,
			DDSD_HEIGHT = 0x2,
			DDSD_WIDTH = 0x4,
			DDSD_PITCH = 0x8,
			DDSD_PIXELFORMAT = 0x1000,
			DDSD_MIPMAPCOUNT = 0x20000,
			DDSD_LINEARSIZE = 0x80000,
			DDSD_DEPTH = 0x800000;

		var DDSCAPS_COMPLEX = 0x8,
			DDSCAPS_MIPMAP = 0x400000,
			DDSCAPS_TEXTURE = 0x1000;
			
		var DDSCAPS2_CUBEMAP = 0x200,
			DDSCAPS2_CUBEMAP_POSITIVEX = 0x400,
			DDSCAPS2_CUBEMAP_NEGATIVEX = 0x800,
			DDSCAPS2_CUBEMAP_POSITIVEY = 0x1000,
			DDSCAPS2_CUBEMAP_NEGATIVEY = 0x2000,
			DDSCAPS2_CUBEMAP_POSITIVEZ = 0x4000,
			DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x8000,
			DDSCAPS2_VOLUME = 0x200000;

		var DDPF_ALPHAPIXELS = 0x1,
			DDPF_ALPHA = 0x2,
			DDPF_FOURCC = 0x4,
			DDPF_RGB = 0x40,
			DDPF_YUV = 0x200,
			DDPF_LUMINANCE = 0x20000;

		function FourCCToInt32(value) {
			return value.charCodeAt(0) +
				(value.charCodeAt(1) << 8) +
				(value.charCodeAt(2) << 16) +
				(value.charCodeAt(3) << 24);
		}

		function Int32ToFourCC(value) {
			return String.fromCharCode(
				value & 0xff,
				(value >> 8) & 0xff,
				(value >> 16) & 0xff,
				(value >> 24) & 0xff
			);
		}

		var FOURCC_DXT1 = FourCCToInt32("DXT1");
		var FOURCC_DXT5 = FourCCToInt32("DXT5");

		var headerLengthInt = 31; // The header length in 32 bit ints

		// Offsets into the header array
		var off_magic = 0;

		var off_size = 1;
		var off_flags = 2;
		var off_height = 3;
		var off_width = 4;

		var off_mipmapCount = 7;

		var off_pfFlags = 20;
		var off_pfFourCC = 21;
		
		
		var header = new Int32Array(arrayBuffer, 0, headerLengthInt),
			fourCC, blockBytes, internalFormat,
			width, height, dataLength, dataOffset,
			byteArray, mipmapCount, i;

		if(header[off_magic] != DDS_MAGIC) {
			console.error("Invalid magic number in DDS header");
			return 0;
		}
		
		if(!header[off_pfFlags] & DDPF_FOURCC) {
			console.error("Unsupported format, must contain a FourCC code");
			return 0;
		}

		fourCC = header[off_pfFourCC];
		switch(fourCC) {
			case FOURCC_DXT1:
				blockBytes = 8;
				internalFormat = ext.COMPRESSED_RGBA_S3TC_DXT1_EXT;
				break;

			case FOURCC_DXT5: 
				blockBytes = 16;
				internalFormat = ext.COMPRESSED_RGBA_S3TC_DXT5_EXT;
				break;

			default:
				console.error("Unsupported FourCC code:", Int32ToFourCC(fourCC));
				return null;
		}

		mipmapCount = 1;
		if(header[off_flags] & DDSD_MIPMAPCOUNT && loadMipmaps !== false) {
			mipmapCount = Math.max(1, header[off_mipmapCount]);
		}

		width = header[off_width];
		height = header[off_height];
		dataOffset = header[off_size] + 4;
		
		var mipmaps = [];
		
		for(i = 0; i < mipmapCount; ++i) {
			var mipmap = {}; // createObject("mipmap");
		
			mipmap.dataLength = Math.max( 4, width )/4 * Math.max( 4, height )/4 * blockBytes;
			mipmap.byteArray = new Uint8Array(arrayBuffer, dataOffset, mipmap.dataLength);
			mipmap.height = width;
			mipmap.width = height;
			mipmap.internalFormat = internalFormat;
			
			mipmaps.push(mipmap);
			
			dataOffset += dataLength;
			
			width *= 0.5;
			height *= 0.5;
		}


		return mipmaps;
	}
}

export {resourceManager as default};
 
 
 



var randomImage = 	new Uint8Array ( 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var randomImage2 = new Uint8Array ( 	[149,123,253,255, 126,3,96,255,    164,246,98,255, 154,177,13,255,
									52,83,220,255,   1,142,142,255,   32,57,79,255,   48,159,32,255,
									56,232,114,255,  177,216,203,255, 69,196,217,255, 240,165,81,255,
									224,56,85,255,   232,89,189,255,  143,25,202,255, 117,73,12,255] );