cc.Class({
    extends: cc.Component,

    properties: {
        manifestUrl: {
            type: cc.Asset,
            default: null
        },
        _updating: false,
        _canRetry: false,
        _storagePath: '',
        updateFinish: false,
        percent: 100
    },

    checkCb: function (event) {
        console.log('checkCb  ')

        switch (event.getEventCode()) {
            case jsb.EventAssetsManager.ERROR_NO_LOCAL_MANIFEST:
                console.log('checkCb   No local manifest file found, hot update skipped.')
                this.updateFinish = true
                break;
            case jsb.EventAssetsManager.ERROR_DOWNLOAD_MANIFEST:
                console.log('checkCb  ERROR_DOWNLOAD_MANIFEST')
                this.updateFinish = true
                break
            case jsb.EventAssetsManager.ERROR_PARSE_MANIFEST:
                console.log('checkCb   Fail to download manifest file, hot update skipped.')
                this.updateFinish = true
                break;
            case jsb.EventAssetsManager.ALREADY_UP_TO_DATE:
                console.log('checkCb  ALREADY_UP_TO_DATE ')
                this.updateFinish = true
                break;
            case jsb.EventAssetsManager.NEW_VERSION_FOUND:
                this.percent = 0
                setTimeout(() => {
                    this.hotUpdate()
                }, 500);

                break;
            default:
                return;
        }

        // this._am.setEventCallback(null);
        // this._checkListener = null;
        this._updating = false;
    },

    updateCb: function (event) {
        var needRestart = false;
        var failed = false;
        switch (event.getEventCode()) {
            case jsb.EventAssetsManager.ERROR_NO_LOCAL_MANIFEST:
                failed = true;
                this.updateFinish = true
                break;
            case jsb.EventAssetsManager.UPDATE_PROGRESSION:
                console.log('checkCb  getDownloadedFiles/getTotalFiles ', event.getDownloadedFiles(), "/", event.getTotalFiles())
                // console.log('checkCb  getDownloadedBytes/getTotalBytes >>  ', event.getDownloadedBytes(), "/", event.getTotalBytes())

                let progress = 0
                if (event.getTotalBytes() != 0) {
                    progress = (event.getDownloadedBytes() / event.getTotalBytes()).toFixed(2)
                }
                this.percent = Math.floor(progress * 100)

                break;
            case jsb.EventAssetsManager.ERROR_DOWNLOAD_MANIFEST:
            case jsb.EventAssetsManager.ERROR_PARSE_MANIFEST:
                this.updateFinish = true
                failed = true;
                break;
            case jsb.EventAssetsManager.ALREADY_UP_TO_DATE:
                this.updateFinish = true
                failed = true;
                break;
            case jsb.EventAssetsManager.UPDATE_FINISHED:
                needRestart = true;
                break;
            case jsb.EventAssetsManager.UPDATE_FAILED:
                this._updating = false;
                this._canRetry = true;

                setTimeout(() => {
                    this.checkUpdate()
                }, 300);

                break;
            case jsb.EventAssetsManager.ERROR_UPDATING:
                break;
            case jsb.EventAssetsManager.ERROR_DECOMPRESS:
                break;
            default:
                break;
        }

        if (failed) {
            this._am.setEventCallback(null);
            this._updateListener = null;
            this._updating = false;
        }

        if (needRestart) {
            this._am.setEventCallback(null);
            this._updateListener = null;
            // Prepend the manifest's search path
            var searchPaths = jsb.fileUtils.getSearchPaths();

            console.log('MMM searchPaths ', searchPaths)
            var newPaths = this._am.getLocalManifest().getSearchPaths();

            console.log('MMM newPaths ', newPaths)
            Array.prototype.unshift.apply(searchPaths, newPaths);

            console.log('MMM searchPaths new  ', searchPaths)
            // This value will be retrieved and appended to the default search path during game startup,
            // please refer to samples/js-tests/main.js for detailed usage.
            // !!! Re-add the search paths in main.js is very important, otherwise, new scripts won't take effect.
            cc.sys.localStorage.setItem('HotUpdateSearchPaths', JSON.stringify(searchPaths));
            jsb.fileUtils.setSearchPaths(searchPaths);

            cc.audioEngine.stopAll();
            cc.game.restart();
        }
    },

    retry: function () {
        if (!this._updating && this._canRetry) {
            this._canRetry = false;

            this._am.downloadFailedAssets();
        }
    },

    checkUpdate: function () {
        if (this._updating) {
            return;
        }
        if (this._am.getState() === jsb.AssetsManager.State.UNINITED) {
            // Resolve md5 url
            var url = this.manifestUrl.nativeUrl;
            if (cc.loader.md5Pipe) {
                url = cc.loader.md5Pipe.transformURL(url);
            }

            console.log("loadLocalManifest  url ", url)
            this._am.loadLocalManifest(url);
        }
        if (!this._am.getLocalManifest() || !this._am.getLocalManifest().isLoaded()) {
            return;
        }
        this._am.setEventCallback(this.checkCb.bind(this));

        console.log('checkUpdate ')
        this._am.checkUpdate();
        this._updating = true;
    },

    hotUpdate: function () {
        if (this._am && !this._updating) {
            this._am.setEventCallback(this.updateCb.bind(this));

            if (this._am.getState() === jsb.AssetsManager.State.UNINITED) {
                // Resolve md5 url
                var url = this.manifestUrl.nativeUrl;
                if (cc.loader.md5Pipe) {
                    url = cc.loader.md5Pipe.transformURL(url);
                }
                this._am.loadLocalManifest(url);
            }

            this._failCount = 0;
            this._am.update();
            this._updating = true;
        }
    },

    // use this for initialization
    onLoad: function () {
        // Hot update is only available in Native build
        console.log('HotUpdate is onLoad');
        if (!cc.sys.isNative) {
            return;
        }
        this._storagePath = ((jsb.fileUtils ? jsb.fileUtils.getWritablePath() : '/') + 'blackjack-remote-asset');
        console.log('Storage path for remote asset : ' + this._storagePath);

        // Setup your own version compare handler, versionA and B is versions in string
        // if the return value greater than 0, versionA is greater than B,
        // if the return value equals 0, versionA equals to B,
        // if the return value smaller than 0, versionA is smaller than B.
        this.versionCompareHandle = function (versionA, versionB) {
            console.log("JS Custom Version Compare: version A is " + versionA + ', version B is ' + versionB);
            var vA = versionA.split('.');
            var vB = versionB.split('.');
            for (var i = 0; i < vA.length; ++i) {
                var a = parseInt(vA[i]);
                var b = parseInt(vB[i] || 0);
                if (a === b) {
                    continue;
                }
                else {
                    return a - b;
                }
            }
            if (vB.length > vA.length) {
                return -1;
            }
            else {
                return 0;
            }
        };

        // Init with empty manifest url for testing custom manifest
        this._am = new jsb.AssetsManager('', this._storagePath, this.versionCompareHandle);

        // Setup the verification callback, but we don't have md5 check function yet, so only print some message
        // Return true if the verification passed, otherwise return false
        this._am.setVerifyCallback(function (path, asset) {
            // When asset is compressed, we don't need to check its md5, because zip file have been deleted.
            var compressed = asset.compressed;
            // Retrieve the correct md5 value.
            var expectedMD5 = asset.md5;
            // asset.path is relative path and path is absolute.
            var relativePath = asset.path;
            // The size of asset file, but this value could be absent.
            var size = asset.size;
            if (compressed) {
                return true;
            }
            else {
                return true;
            }
        });

        if (cc.sys.os === cc.sys.OS_ANDROID) {
            // Some Android device may slow down the download process when concurrent tasks is too much.
            // The value may not be accurate, please do more test and find what's most suitable for your game.
            this._am.setMaxConcurrentTask(2);
        }

        this.percent = 100;
    },

    onDestroy: function () {
        if (this._updateListener) {
            this._am.setEventCallback(null);
            this._updateListener = null;
        }
    }
});