import common from "../common/common";

class Loader {
    private static _instance: Loader;
    public static getInstance(): Loader {
        if (this._instance) {
            return this._instance;
        }
        this._instance = new Loader();
        return this._instance;
    };

    /**
     * 加载bundle资源
     * @param bundleName 
     */
    loadBundle(bundleName: string): Promise<cc.AssetManager.Bundle> {
        return new Promise((resolve) => {
            cc.assetManager.loadBundle(bundleName, null, (err, asset: cc.AssetManager.Bundle) => {
                if (err) {
                    common.log("加载bundle失败：", bundleName);
                    resolve(null);
                }
                else {
                    common.log("加载bundle：", bundleName);
                    resolve(asset);
                }
            });
        });
    }

    loadResLoacl(path): Promise<any>{
        return new Promise((resolve) => {
            cc.resources.load(path, function (err, asset: any) {
                if (err) {
                    common.log("加载失败：", path);
                    resolve(null);
                }
                else {
                    common.log("加载资源：", path);
                    resolve(asset);
                }
            });
        });
    }

    /**
     * 加载资源：bundle内
     * @param type 
     * @param bundle 
     * @param path 
     */
    loadBundleRes(type, bundle, path) {
        switch (type) {
            case "img":
                return this.loadBundleImg(bundle, path);
            case "audio":
                return this.loadBundleAudio(bundle, path);
            case "json":
                return this.loadBundleJson(bundle, path);
            case "font":
                return this.loadBundleFont(bundle, path);
            case "spine":
                return this.loadBundleSpine(bundle, path);
            case "prefab":
                return this.loadBundlePrefab(bundle, path);
            default:
                break;
        }
    }

    /**
     * 加载图片资源：bundle内
     * @param bundle 
     * @param path 
     * @param callBack 
     */
    loadBundleImg(bundle: cc.AssetManager.Bundle, path: string): Promise<cc.Texture2D> {
        return new Promise((resolve) => {
            bundle.load(path, cc.Texture2D, (err, asset: cc.Texture2D) => {
                if (err) {
                    common.log("加载图片失败：", path);
                }
                else {
                    common.log("加载图片：", path);
                    resolve(asset);
                }
            });
        })
    }

    /**
     * 加载音频资源：bundle内
     * @param bundle
     * @param path
     */
    loadBundleAudio(bundle: cc.AssetManager.Bundle, path: string): Promise<cc.AudioClip> {
        return new Promise((resolve) => {
            bundle.load(path, cc.AudioClip, (err, asset: cc.AudioClip) => {
                if (err) {
                    common.log("加载音频失败：", path);
                }
                else {
                    common.log("加载音频：", path);
                    resolve(asset);
                }
            });
        });
    }

    /**
     * 加载json资源：bundle内
     * @param bundle 
     * @param path
     */
    loadBundleJson(bundle: cc.AssetManager.Bundle, path): Promise<cc.JsonAsset> {
        return new Promise((resolve) => {
            bundle.load(path, cc.JsonAsset, (err, asset: cc.JsonAsset) => {
                if (err) {
                    common.log("加载json失败：", path);
                }
                else {
                    common.log("加载json：", path);
                    resolve(asset);
                }
            });
        });

    }

    /**
     * 加载字体资源：bundle内
     * @param bundle 
     * @param path
     */
    loadBundleFont(bundle: cc.AssetManager.Bundle, path: string): Promise<cc.Font> {
        return new Promise((resolve) => {
            bundle.load(path, cc.Font, (err, asset: cc.Font) => {
                if (err) {
                    common.log("加载字体失败: ", path);
                }
                else {
                    common.log("加载字体: ", path);
                    resolve(asset);
                }
            });
        });
    }

    /**
     * 加载spine资源：bundle内
     * @param bundle 
     * @param path
     */
    loadBundleSpine(bundle: cc.AssetManager.Bundle, path: string): Promise<sp.SkeletonData> {
        return new Promise((resolve) => {
            bundle.load(path, sp.SkeletonData, (err, asset: sp.SkeletonData) => {
                if (err) {
                    common.log("加载spine失败: ", path);
                }
                else {
                    common.log("加载spine: ", path);
                    resolve(asset);
                }
            });
        });
    }

    /**
     * 加载prefab资源：bundle内
     * @param bundle 
     * @param path
     */
    loadBundlePrefab(bundle: cc.AssetManager.Bundle, path): Promise<cc.Prefab> {
        return new Promise((resolve) => {
            bundle.load(path, cc.Prefab, (err, asset: cc.Prefab) => {
                if (err) {
                    common.log("加载prefab失败: ", path);
                }
                else {
                    common.log("加载prefab: ", path);
                    resolve(asset);
                }
            });
        });
    }

    /**
     * 加载图片资源：bundle内
     * @param bundle 
     * @param path 
     * @param callBack 
     */
     loadBundleDir(bundle: cc.AssetManager.Bundle, path: string): Promise<cc.Asset[]> {
        return new Promise((resolve) => {
            bundle.loadDir(path, cc.Asset, (err, assets: cc.Asset[]) => {
                if (err) {
                    common.log("加载图片失败：", path);
                }
                else {
                    common.log("加载图片：", path);
                    resolve(assets);
                }
            });
        })
    }

    /**
     * 加载其他资源：bundle内
     * @param bundle 
     * @param path 
     * @param callBack 
     */
     loadBundleOther(bundle: cc.AssetManager.Bundle, path: string): Promise<cc.Asset> {
        return new Promise((resolve) => {
            bundle.load(path, cc.Asset, (err, assets: cc.Asset) => {
                if (err) {
                    common.log("加载资源失败：", path);
                }
                else {
                    common.log("加载资源：", path);
                    resolve(assets);
                }
            });
        })
    }

    /**
     * 加载资源：远程加载
     * @param type 
     * @param url
     */
    loadRemote(type, url) {
        switch (type) {
            case "img":
                return this.loadRemoteImg(url);
            case "mp3":
                return this.loadRemoteAudio(url);
            default:
                break;
        }
    };

    /**
     * 加载图片资源：远程加载
     * @param url
     */
    loadRemoteImg(url) {
        return new Promise((resolve) => {
            cc.assetManager.loadRemote(url, (err: Error, asset: cc.Texture2D) => {
                if (err) {
                    common.log("加载图片失败：", url);
                }
                else {
                    common.log("加载图片：", url);
                    resolve(asset);
                }
            });
        });
    };

    /**
     * 加载音频资源：远程加载
     * @param url
     */
    loadRemoteAudio(url) {
        return new Promise((resolve) => {
            cc.assetManager.loadRemote(url, (err: Error, asset: cc.AudioClip) => {
                if (err) {
                    common.log("加载音频失败：", url);
                }
                else {
                    common.log("加载音频：", url);
                    resolve(asset);
                }
            });
        });
    };

    /**
     * 加载spine资源：远程加载
     * @param key 
     * @param url 
     * @param obj 
     * @param callBack 
     */
    loadRemoteSpine(key, url, obj, callBack) {
        let functionA = (texture, skeAtlas, skeJson) => {
            let skeletonData = new sp.SkeletonData();
            skeletonData.skeletonJson = skeJson.json;
            skeletonData.atlasText = skeAtlas.text;
            skeletonData.textures = [texture];
            if (skeletonData["textureNames"]) {
                skeletonData["textureNames"] = [key + ".png"];
            }
            obj[url] = skeletonData;
            common.log("加载spine：", url);
            callBack();
        };
        cc.assetManager.loadRemote(url + ".png", (err: Error, texture: cc.Texture2D) => {
            cc.assetManager.loadRemote(url + ".atlas", (error: Error, skeAtlas: cc.TextAsset) => {
                cc.assetManager.loadRemote(url + ".json", (error: Error, skeJson: cc.JsonAsset) => {
                    functionA(texture, skeAtlas, skeJson);
                });
            });
        });
    };
};
export default Loader.getInstance();