import fs from 'fs';
import path from 'path';
import dotenv from 'dotenv';
import { fileURLToPath } from 'url';

// 配置类型
export type Config = {
  PORT: number;
  // redis
  REDIS_HOST?: string;
  REDIS_PORT?: number;
  REDIS_PASSWORD?: string;
  REDIS_VERSION?: string;
  REDIS_DB?: number;
  REDIS_USER?: string;
  // postgres
  POSTGRES_HOST?: string;
  POSTGRES_PORT?: number;
  POSTGRES_PASSWORD?: string;
  POSTGRES_USER?: string;
  POSTGRES_DB?: string;
  // minio
  MINIO_ENDPOINT?: string;
  MINIO_BUCKET_NAME?: string;
  MINIO_ACCESS_KEY?: string;
  MINIO_SECRET_KEY?: string;
  MINIO_USE_SSL?: boolean;
  // mongo
  MONGO_URI?: string;
  //
  [key: string]: any;
};
export const initConfig: Config = {
  PORT: 3000,
};
export const fileIsExist = (path: string) => {
  try {
    fs.accessSync(path, fs.constants.F_OK);
    return true;
  } catch (e) {
    return false;
  }
};
export const getDirname = () => {
  return process.cwd();
};
/**
 * 配置选项
 */
export type ConfigOpts = {
  /**
   * 环境配置文件路径, default: 自定设置，优先级最高， process.cwd() + envConfigFile
   */
  envConfigFile?: string;
  /**
   * 当前工作目录, default: process.cwd()
   */
  cwd?: string;
  /**
   * 配置文件名, default: .env
   */
  fileName?: string;
};
/**
 * 查找文件，3级查找。往上查询
 * @param fileName 文件名
 * @returns
 */
export const getConfigFile = (opts?: ConfigOpts) => {
  if (opts?.envConfigFile) {
    const filePath = path.join(opts.cwd || getDirname(), opts.envConfigFile);
    if (fileIsExist(filePath)) {
      return filePath;
    }
  }
  const fileName = opts?.fileName || '.env';
  const dirname = opts?.cwd || getDirname();
  // 本级
  const benPath = dirname + '/' + fileName;
  const ben = fileIsExist(benPath);
  if (ben) return benPath;
  // 上级
  const lastPath = path.join(dirname, '../' + fileName);
  const last = fileIsExist(lastPath);
  if (last) return lastPath;
  // 上上级
  const lastLastPath = path.join(dirname, '../../' + fileName);
  const lastLast = fileIsExist(lastLastPath);
  if (lastLast) return lastLastPath;
  return '';
};
type GetConfigOpts = ConfigOpts & { dotenvOpts?: dotenv.DotenvConfigOptions };
/**
 * 初始化配置, 不会把配置内容挂载到全局
 * @param opts 配置选项
 * @param opts.envConfigFile 环境配置文件路径, default: 为空，process.cwd() + envConfigFile
 * @param opts.cwd 当前工作目录, default: process.cwd()
 * @param opts.fileName 配置文件名, default: .env
 * @param opts.dotenvOpts dotenv配置选项
 * @returns 配置
 */
export const getConfig = (opts?: GetConfigOpts): Config => {
  if (opts?.dotenvOpts) {
    const prased = dotenv.config(opts.dotenvOpts).parsed as Config;
    if (prased) {
      return prased;
    } else {
      throw new Error('未找到配置文件');
    }
  }
  // 配置读取路径，3级判断
  const filePath = getConfigFile(opts);
  console.log('config pathname:', filePath);
  if (!filePath) {
    throw new Error('未找到配置文件');
  }
  const value = dotenv.config({ path: filePath }).parsed as Config;
  return value;
};

/**
 * 从全局获取
 * @param initConfig 在全局未找到配置时，初始化配置的内容
 * @param force 是否强制重新获取配置
 * @returns Config
 */
export const useConfig = <T>(onlyInitConfig?: GetConfigOpts, force?: boolean): Config & T => {
  const config = (global as any).config;
  let _config = config || getConfig(onlyInitConfig);
  !config && ((global as any)['config'] = _config);
  if (force && onlyInitConfig) {
    const _newConfig = getConfig(onlyInitConfig);
    _config = mergeConfig(_newConfig);
  }
  return _config;
};

/**
 * 更新配置
 * @param configOpts 配置
 * @param opts 配置选项
 * @param opts.cwd 当前工作目录, default: process.cwd()
 * @param opts.fileName 配置文件名, default: config.json
 */
export const updateConfig = (configOpts: GetConfigOpts) => {
  const newConfig = getConfig(configOpts);
  return mergeConfig(newConfig);
};
export const mergeConfig = (config: { [key: string]: any }) => {
  const _config = (global as any).config || {};
  Object.assign(_config, config);
  (global as any).config = _config;
  return _config;
};

export const useKey = (key: string, opts?: { defaultValue?: string; isNumber?: boolean; isBoolean?: boolean }): string | number | boolean => {
  let v = useConfig()[key];
  if (!v) {
    v = process.env[key];
  }
  if (!v) {
    return opts?.defaultValue || null;
  }
  if (opts?.isNumber && typeof v === 'string') {
    return Number(v);
  }
  if (opts?.isBoolean && typeof v === 'string') {
    return v === 'true';
  }
  return v;
};

/**
 * 写入json配置文件
 * @param config 配置
 * @param opts 配置选项
 * @param opts.cwd 当前工作目录, default: process.cwd()
 * @param opts.fileName 配置文件名, default: config.json
 */
export const writeJsonConfig = (config = {}, opts?: Omit<ConfigOpts, 'envConfigFile'>) => {
  const filePath = getConfigFile({ ...opts, fileName: opts?.fileName || 'config.json' });
  if (!filePath) {
    throw new Error(`未找到配置文件: ${opts?.fileName || 'config.json'}`);
  }
  fs.writeFileSync(filePath, JSON.stringify(config, null, 2));
};

/**
 * 读取json配置文件
 * @param opts 配置选项
 * @param opts.cwd 当前工作目录, default: process.cwd()
 * @param opts.fileName 配置文件名, default: config.json
 * @returns 配置
 */
export const readJsonConfig = (opts?: Omit<ConfigOpts, 'envConfigFile'>) => {
  const filePath = getConfigFile({ ...opts, fileName: opts?.fileName || 'config.json' });
  if (!filePath) {
    throw new Error(`未找到配置文件: ${opts?.fileName || 'config.json'}`);
  }
  try {
    const value = JSON.parse(fs.readFileSync(filePath, 'utf-8'));
    return value;
  } catch (e) {
    return {};
  }
};

type ResolvePathOptions = {
  meta?: {
    url: string;
  };
  cwd?: string;
};
/**
 * 获取相对当前路径的path
 * @param releactivePath
 * @returns
 */
export const resolvePath = (releactivePath: string = '', opts?: ResolvePathOptions) => {
  if (opts?.meta) {
    const __filename = fileURLToPath(opts.meta.url);
    const __dirname = path.dirname(__filename);
    return path.resolve(__dirname, releactivePath);
  } else if (opts?.cwd) {
    return path.resolve(opts.cwd, releactivePath);
  } else {
    return path.resolve(getDirname(), releactivePath);
  }
};