const fs = require('fs');
const path = require('path');
const crypto = require('crypto');
const setting = require('./build-setting');
const utils = require('./libs/utils');
const assetsObfuscator = require('./assets-obfuscator');

module.exports = (function (){
    var _instance;

    function AssetsHotUpdate (params) {
        return {
            _ready: false,
            _src: null,
            _dest: null,
            _manifest: {
                packageUrl: 'http://localhost/hot-update/',
                remoteManifestUrl: 'http://localhost/hot-update/project.manifest',
                remoteVersionUrl: 'http://localhost/hot-update/version.manifest',
                version: '300001',
                assets: {},
                searchPaths: []
            },

            init (actualPlatform) {
                this._ready = false;

                let assetsHotUpdate = `assetsHotUpdate`;
                let update = setting.getInstance().getItem(assetsHotUpdate);
                if (!update) { Editor.warn('缺少配置，跳过资源热更！'); return false; }
                if (!update.enable) { Editor.warn('未开启资源热更！'); return false; }
                let platform = update.platform || ''; // 平台配置
                let supportList = platform.split(',');
                if (!supportList.includes(actualPlatform)) {
                    Editor.warn(actualPlatform, '平台不支持资源热更');
                    return false;
                }

                let src = update.src;
                let dest = update.dest;
                let appVersion = update.appVersion; // 指定的代码版本号
                let hxCode = update.hxCode; // 指定的混淆码
                let resVersion = update.resVersion; // 指定的代码资源号
                let remoteUrl = update.remoteUrl;
                if (!src || !dest || !remoteUrl) {
                    Editor.error('资源热更配置不满足');
                    return false;
                }

                let cfg = setting.getInstance().getVersionConfig() || {};
                // 如果没有指定代码版本号就使用 VersionConfig.js 的代码版本号
                if (!resVersion || resVersion.length === 0) {
                    appVersion = String(cfg.APP_VERSION) || '';
                }
                // 如果没有指定混淆码就使用 VersionConfig.js 的混淆码
                if (!hxCode || hxCode.length === 0) {
                    hxCode = String(cfg.HX_CODE) || '';
                }
                // 如果没有指定代码资源号就使用 VersionConfig.js 的代码资源号
                if (!resVersion || resVersion.length === 0) {
                    resVersion = String(cfg.RES_VERSION) || '';
                }

                this.appVersion = appVersion;
                this.hxCode = hxCode;
                this.resVersion = resVersion;

                Editor.log('代码版本号: ' + appVersion + '; 混淆Code: ' + hxCode + '; 代码资源号: ' + resVersion);

                this._src = path.join(Editor.Project.path, src);
                this._dest = path.join(Editor.Project.path, dest);
                if (fs.existsSync(this._dest)) {
                    utils.rmdirSync(this._dest);
                }
                fs.mkdirSync(this._dest);

                this._manifest.version = resVersion;
                this._manifest.packageUrl = remoteUrl;
                this._manifest.remoteManifestUrl = remoteUrl + '/project.manifest';
                this._manifest.remoteVersionUrl = remoteUrl + '/version.manifest';
                this._manifest.assets = {};
                this._manifest.searchPaths = [];

                // 获取UUID
                let assetsdb = this.getAssetsdbPath(this._src);

                let projectManifestPath = this._src + '/project.manifest';
                utils.accessPath(projectManifestPath, (err)=> {
                    if (err && err.code === 'ENOENT') {
                        let assetsdbProjectManifestPath = assetsdb + '/project.manifest';
                        utils.createProjectManifestAssets(assetsdbProjectManifestPath, remoteUrl, (err, results) => {
                            if (err) {
                                Editor.error(err);
                                return false;
                            }
                            let result = results[0];
                            this._projectManifestUUID = result.uuid;
                        });
                    } else {
                        this._projectManifestUUID = Editor.assetdb._path2uuid[projectManifestPath];
                    }
                });

                let versionManifestPath = this._src + '/version.manifest';
                utils.accessPath(versionManifestPath, (err)=> {
                    let assetsdbVersionManifestPath = assetsdb + '/version.manifest';
                    if (err && err.code === 'ENOENT') {
                        utils.createVersionManifestAssets(assetsdbVersionManifestPath, remoteUrl, (err, results) => {
                            if (err) {
                                Editor.error(err);
                                return false;
                            }
                            let result = results[0];
                            this._versionManifestUUID = result.uuid;
                        });
                    } else {
                        this._versionManifestUUID = Editor.assetdb._path2uuid[versionManifestPath];
                    }
                });

                this._ignoreFileUuids = [];
                let ignores = update.ignores;
                if (ignores) {
                    for (const aPath of ignores) {
                        let fullpath = path.join(Editor.Project.path, aPath);
                        let stat = fs.statSync(fullpath);
                        if (stat.isDirectory()) {
                            utils.findFileSync(fullpath, (filePath)=> {
                                this.addIgnoreFile(filePath);
                            });
                        } else if (stat.isFile()) {
                            this.addIgnoreFile(fullpath);
                        }
                    }
                }

                this._ready = true;

                return true;
            },

            isReady () {
                return this._ready;
            },

            addIgnoreFile (filePath) {
                let index = filePath.lastIndexOf('.');
                let ext = filePath.substr(index + 1);
                if (ext !== 'meta') {
                    let uuid = Editor.assetdb._path2uuid[filePath];
                    this._ignoreFileUuids.push(uuid);
                }
            },

            getAssetsdbPath (root) {
                let assetsdb = 'db://';
                let assetsIdx = root.indexOf('assets');
                if (assetsIdx !== -1) {
                    assetsdb += root.substr(assetsIdx, root.length);
                } else {
                    assetsdb += '/assets';
                }
                return assetsdb;
            },

            addHotUpdateSearchPaths (buildDest) {
                var root = path.normalize(buildDest);
                var url = path.join(root, 'main.js');
                let data = fs.readFileSync(url, 'utf8');
                if (data) {
                    try {
                        var newStr =
                        '    // 编译助手追加代码 开始\n' +
                        '    var hotUpdateSearchPaths = jsb.fileUtils.getWritablePath() + \'remote-assets\';\n' +
                        '    var curVersionName = \'' + this.appVersion + '\';\n' +
                        '    var curHxCode = \'' + this.hxCode + '\';\n' +
                        '    var oldVersionName = cc.sys.localStorage.getItem(\'HOT_UPDATE_VERSION_NAME\');\n' +
                        '    var oldHxCode = cc.sys.localStorage.getItem(\'HOT_UPDATE_HX_CODE\');\n' +
                        '    if (curVersionName != oldVersionName || curHxCode != oldHxCode) {\n' +
                        '        jsb.fileUtils.removeDirectory(hotUpdateSearchPaths);\n' +
                        '    }\n' +
                        '    var searchPaths = jsb.fileUtils.getSearchPaths();\n' +
                        '    searchPaths.unshift(hotUpdateSearchPaths);\n' +
                        '    jsb.fileUtils.setSearchPaths(searchPaths);\n' +
                        '    // 编译助手追加代码 结束\n\n' +
                        '    window.boot();';
                        newStr = data.replace('    window.boot();', newStr);
                        fs.writeFileSync(url, newStr);
                        Editor.log('热更搜索路径写入' + url + '成功');
                    } catch (error) {
                        Editor.error('热更搜索路径成功写入' + url + '失败');
                    }
                } else {
                    Editor.error('读取' + url + '失败');
                }
            },

            getAssetsBuiledUrl (root, uuid) {
                if (!root || !uuid) {
                    return;
                }

                let url;
                let dirname = uuid.substr(0, 2);
                let dirPath = path.join(root, 'res/raw-assets', dirname);
                let files = fs.readdirSync(dirPath);
                for (const fileName of files) {
                    if (fileName.includes(uuid)) {
                        url = path.join(dirPath, fileName);
                        break;
                    }
                }

                return url;
            },

            readBuildDest (root, dir, obj) {
                let stat = fs.statSync(dir);
                if (!stat.isDirectory()) {
                    return;
                }
                let subpaths = fs.readdirSync(dir), subpath, size, md5, compressed, relative;
                for (let i = 0; i < subpaths.length; ++i) {
                    if (subpaths[i][0] === '.') {
                        continue;
                    }

                    subpath = path.join(dir, subpaths[i]);
                    stat = fs.statSync(subpath);
                    if (stat.isDirectory()) {
                        this.readBuildDest(root, subpath, obj);
                    } else if (stat.isFile()) {
                        let hasIgnore = false;
                        for (const uuid of this._ignoreFileUuids) {
                            let include = subpath.includes(uuid);
                            if (include) {
                                hasIgnore = true;
                                break;
                            }
                        }

                        if (hasIgnore) {
                            continue;
                        }

                        // Size in Bytes
                        size = stat['size'];
                        md5 = crypto.createHash('md5').update(fs.readFileSync(subpath)).digest('hex');
                        compressed = path.extname(subpath).toLowerCase() === '.zip';

                        relative = path.relative(root, subpath);
                        relative = relative.replace(/\\/g, '/');
                        relative = encodeURI(relative);
                        obj[relative] = {
                            'size': size,
                            'md5': md5
                        };
                        if (compressed) {
                            obj[relative].compressed = true;
                        }
                    }
                }
            },

            generateManifest (buildDest, callback) {
                let projectManifestUUID = this._projectManifestUUID;
                let versionManifestUUID = this._versionManifestUUID;
                if (assetsObfuscator.getInstance().isReady()) {
                    let mima = assetsObfuscator.getInstance().getMima();
                    if (this._projectManifestUUID) {
                        projectManifestUUID = assetsObfuscator.getInstance().getNewName(mima, this._projectManifestUUID);
                    }
                    if (this._versionManifestUUID) {
                        Editor.log('this._versionManifestUUID', this._versionManifestUUID);
                        versionManifestUUID = assetsObfuscator.getInstance().getNewName(mima, this._versionManifestUUID);
                        Editor.log('versionManifestUUID', versionManifestUUID);
                    }
                }

                let projectManifestURL = this.getAssetsBuiledUrl(buildDest, projectManifestUUID);
                if (!projectManifestURL) {
                    Editor.error('生成project.manifest失败');
                    return;
                }
                let versionManifestURL = this.getAssetsBuiledUrl(buildDest, versionManifestUUID);
                if (!versionManifestURL) {
                    Editor.error('生成version.manifest失败');
                    return;
                }
                let destProjectManifestURL = path.join(this._dest, 'project.manifest');
                let destVersionManifestURL = path.join(this._dest, 'version.manifest');

                this.readBuildDest(buildDest, path.join(buildDest, 'src'), this._manifest.assets);
                this.readBuildDest(buildDest, path.join(buildDest, 'res'), this._manifest.assets);

                try {
                    fs.writeFileSync(projectManifestURL, JSON.stringify(this._manifest));
                    fs.writeFileSync(destProjectManifestURL, JSON.stringify(this._manifest));
                    Editor.log('写入project.manifest成功', projectManifestURL);
                    let md5 = crypto.createHash('md5').update(fs.readFileSync(destProjectManifestURL)).digest('hex');
                    Editor.warn('project.manifest md5 = ', md5);

                    delete this._manifest.assets;
                    delete this._manifest.searchPaths;
                    fs.writeFileSync(versionManifestURL, JSON.stringify(this._manifest));
                    fs.writeFileSync(destVersionManifestURL, JSON.stringify(this._manifest));
                    Editor.log('写入version.manifest成功', versionManifestURL);

                    callback();
                } catch (error) {
                    callback(error);
                }
            },

            copyAssets (buildDest) {
                // fs.copyFileSync(path.join(buildDest, 'main.js'), path.join(this._dest, 'main.js'));
                // fs.copyFileSync(path.join(buildDest, 'project.json'), path.join(this._dest, 'project.json'));
                // utils.copyFolder(path.join(buildDest, 'jsb-adapter'), path.join(this._dest, 'jsb-adapter'));
                utils.copyFolder(path.join(buildDest, 'src'), path.join(this._dest, 'src'));
                utils.copyFolder(path.join(buildDest, 'res'), path.join(this._dest, 'res'));

                // let debuggingPath = path.join(buildDest, 'js backups (useful for debugging)');
                // if (fs.existsSync(debuggingPath)) {
                //     utils.copyFolder(debuggingPath, path.join(this._dest, 'js backups (useful for debugging)'));
                // }
            }
        };
    }

    return {
        getInstance (params) {
            if (!_instance){
                _instance = AssetsHotUpdate(params);
            }
            return _instance;
        }
    };
})();