/******************************************************************************
 * Spine Runtimes Software License v2.5
 *
 * Copyright (c) 2013-2016, Esoteric Software
 * All rights reserved.
 *
 * You are granted a perpetual, non-exclusive, non-sublicensable, and
 * non-transferable license to use, install, execute, and perform the Spine
 * Runtimes software and derivative works solely for personal or internal
 * use. Without the written permission of Esoteric Software (see Section 2 of
 * the Spine Software License Agreement), you may not (a) modify, translate,
 * adapt, or develop new applications using the Spine Runtimes or otherwise
 * create derivative works or improvements of the Spine Runtimes or (b) remove,
 * delete, alter, or obscure any trademarks or any copyright, trademark, patent,
 * or other intellectual property or proprietary rights notices on or in the
 * Software, including any copy thereof. Redistributions in binary or source
 * form must include this license and terms.
 *
 * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL ESOTERIC SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, BUSINESS INTERRUPTION, OR LOSS OF
 * USE, DATA, OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

module spine {
	export class AssetManager implements Disposable {
		private pathPrefix: string;
		private textureLoader: (image: HTMLImageElement) => any;
		private assets: Map<any> = {};
		private errors: Map<string> = {};
		private toLoad = 0;
		private loaded = 0;

		constructor (textureLoader: (image: HTMLImageElement) => any, pathPrefix: string = "") {
			this.textureLoader = textureLoader;
			this.pathPrefix = pathPrefix;
		}

		loadText(path: string,
			success: (path: string, text: string) => void = null,
			error: (path: string, error: string) => void = null
		) {
			path = this.pathPrefix + path;
			this.toLoad++;
			let request = new XMLHttpRequest();
			request.onreadystatechange = () => {
				if (request.readyState == XMLHttpRequest.DONE) {
					if (request.status >= 200 && request.status < 300) {
						this.assets[path] = request.responseText;
						if (success) success(path, request.responseText);
					} else {
						this.errors[path] = `Couldn't load text ${path}: status ${request.status}, ${request.responseText}`;
						if (error) error(path, `Couldn't load text ${path}: status ${request.status}, ${request.responseText}`);
					}
					this.toLoad--;
					this.loaded++;
				}
			};
			request.open("GET", path, true);
			request.send();
		}

		loadTexture (path: string,
			success: (path: string, image: HTMLImageElement) => void = null,
			error: (path: string, error: string) => void = null
		) {
			path = this.pathPrefix + path;
			this.toLoad++;
			let img = new Image();
			img.crossOrigin = "anonymous";
			img.src = path;
			img.onload = (ev) => {
				let texture = this.textureLoader(img);
				this.assets[path] = texture;
				this.toLoad--;
				this.loaded++;
				if (success) success(path, img);
			}
			img.onerror = (ev) => {
				this.errors[path] = `Couldn't load image ${path}`;
				this.toLoad--;
				this.loaded++;
				if (error) error(path, `Couldn't load image ${path}`);
			}
		}

		get (path: string) {
			path = this.pathPrefix + path;
			return this.assets[path];
		}

		remove (path: string) {
			path = this.pathPrefix + path;
			let asset = this.assets[path];
			if ((<any>asset).dispose) (<any>asset).dispose();
			this.assets[path] = null;
		}

		removeAll () {
			for (let key in this.assets) {
				let asset = this.assets[key];
				if ((<any>asset).dispose) (<any>asset).dispose();
			}
			this.assets = {};
		}

		isLoadingComplete (): boolean {
			return this.toLoad == 0;
		}

		getToLoad (): number {
			return this.toLoad;
		}

		getLoaded (): number {
			return this.loaded;
		}

		dispose () {
			this.removeAll();
		}

		hasErrors() {
			return Object.keys(this.errors).length > 0;
		}

		getErrors() {
			return this.errors;
		}
	}
}