import dayjs from 'dayjs';
import { readdir, stat } from 'node:fs';
import { fileURLToPath } from 'node:url';
import { dirname, resolve } from 'node:path';
import {
  name,
  version,
  engines,
  dependencies,
  devDependencies
} from '../../package.json';
import formatBytes from './formatBytes';
import sum from './sum';

/** 启动`node`进程时所在工作目录的绝对路径 */
const root: string = process.cwd();

/**
 * @description 根据可选的路径片段生成一个新的绝对路径
 * @param dir 路径片段，默认`build`
 * @param metaUrl 模块的完整`url`，如果在`build`目录外调用必传`import.meta.url`
 */
const pathResolve = (dir = '.', metaUrl = import.meta.url) => {
  // 当前文件目录的绝对路径
  const currentFileDir = dirname(fileURLToPath(metaUrl));
  // build 目录的绝对路径
  const buildDir = resolve(currentFileDir, 'build');
  // 解析的绝对路径
  const resolvedPath = resolve(currentFileDir, dir);
  // 检查解析的绝对路径是否在 build 目录内
  if (resolvedPath.startsWith(buildDir)) {
    // 在 build 目录内，返回当前文件路径
    return fileURLToPath(metaUrl);
  }
  // 不在 build 目录内，返回解析后的绝对路径
  return resolvedPath;
};

/** 设置别名 */
const alias: Record<string, string> = {
  '@': pathResolve('../../src'),
  '@assets': pathResolve('../../src/assets'),
  '@utils': pathResolve('../../src/utils')
};

/** 平台的名称、版本、运行所需的`node`和`pnpm`版本、依赖、最后构建时间的类型提示 */
const __APP_INFO__ = {
  pkg: { name, version, engines, dependencies, devDependencies },
  lastBuildTime: dayjs(new Date()).format('YYYY-MM-DD HH:mm:ss')
};

/** 处理环境变量 */
const wrapperEnv = (envConf: Recordable): ViteEnv => {
  // 默认值
  const ret: ViteEnv = {
    VITE_PORT: 5173,
    VITE_PUBLIC_PATH: '',
    VITE_ROUTER_HISTORY: 'hash',
    VITE_COMPRESSION: 'none',
    VITE_PROXY: '',
    VITE_SERVER_URL: ''
  };
  for (const envName of Object.keys(envConf)) {
    let realName = envConf[envName].replace(/\\n/g, '\n');
    realName =
      realName === 'true' ? true : realName === 'false' ? false : realName;

    if (envName === 'VITE_PORT') {
      realName = Number(realName);
    }
    (ret as Record<string, any>)[envName] = realName;
    if (typeof realName === 'string') {
      process.env[envName] = realName;
    } else if (typeof realName === 'object') {
      process.env[envName] = JSON.stringify(realName);
    }
  }
  return ret;
};

const fileListTotal: number[] = [];

/** 获取指定文件夹中所有文件的总大小 */
const getPackageSize = (options: {
  folder: string;
  callback: (size: number | string) => void;
  format?: boolean;
}) => {
  const { folder = 'dist', callback, format = true } = options;
  readdir(folder, (err, files: string[]) => {
    if (err) throw err;
    let count = 0;
    const checkEnd = () => {
      ++count === files.length &&
        callback(format ? formatBytes(sum(fileListTotal)) : sum(fileListTotal));
    };
    files.forEach((item: string) => {
      stat(`${folder}/${item}`, async (error, stats) => {
        if (error) throw error;
        if (stats.isFile()) {
          fileListTotal.push(stats.size);
          checkEnd();
        } else if (stats.isDirectory()) {
          getPackageSize({
            folder: `${folder}/${item}/`,
            callback: checkEnd
          });
        }
      });
    });
    files.length === 0 && callback(0);
  });
};

export { root, pathResolve, alias, __APP_INFO__, wrapperEnv, getPackageSize };