import { _decorator, Component, Node, sys } from 'cc';
const { ccclass, property } = _decorator;

@ccclass('SubPackageLoader')
export class SubPackageLoader {

    static load(packages: string[], progressCallBack: Function, completeCallBack: Function, errorCallback?: Function): void {
        console.log("平台：" + sys.browserType);
        // switch (sys.browserType) {
        // case sys.BROWSER_TYPE_WECHAT:
        this.__loadWX(packages, progressCallBack, completeCallBack, errorCallback);
        //         break;

        //     default:
        //         break;
        // }
    }

    private static loadSubpackage(index: number, packages: string[], progressCallBack: Function, completeCallBack: Function, errorCallback?: Function): void {
        let loadTask: any;
        let wx: any = window["wx"];
        let packageName: string = packages[index];
        console.log("加载分包：", packageName)
        index++;
        loadTask = wx.loadSubpackage({
            name: packageName,
            success: (res) => {
                if (index < packages.length) {
                    this.loadSubpackage(index, packages, progressCallBack, completeCallBack, errorCallback)
                } else {
                    if (completeCallBack) {
                        completeCallBack();
                    }
                }
            },
            fail: (err) => {
                console.error(err);
                if (errorCallback) {
                    errorCallback(packageName + "加载出错!");
                }
            }
        })
        loadTask.onProgressUpdate(res => {
            if (progressCallBack) {
                progressCallBack(res.progress);
            }
        })
    }

    /**
     * 微信
     * @param packages 
     * @param progressCallBack 
     * @param completeCallBack 
     */
    private static __loadWX(packages: string[], progressCallBack: Function, completeCallBack: Function, errorCallback?: Function): void {
        console.log("wx subpackage load");
        let wx: any = window["wx"];
        let packageName: string;
        let loadIndex: number = 0;
        let total: number = packages.length;
        let loadTask: any;
        this.loadSubpackage(loadIndex, packages, progressCallBack, completeCallBack, errorCallback)
        // for (let index = 0; index < packages.length; index++) {
        //     packageName = packages[index];
        //     loadTask = wx.loadSubpackage({
        //         name: packageName,
        //         success: (res) => {
        //             loadIndex++;
        //             if (loadIndex >= total) {
        //                 if (completeCallBack) {
        //                     completeCallBack();
        //                 }
        //             }
        //         },
        //         fail: (err) => {
        //             console.error(err);
        //             if (errorCallback) {
        //                 errorCallback(packageName + "加载出错!");
        //             }
        //         }
        //     })
        //     loadTask.onProgressUpdate(res => {
        //         if (progressCallBack) {
        //             progressCallBack(loadIndex + res.progress);
        //         }
        //     })
        // }
    }
}