import * as os from 'os';
import * as path from 'path';
import { ModuleDirConfig, SiteConfig } from '../interfaces';
const klawSync = require('klaw-sync');

const USERNAME_FLAG = '_USERNAME_FLAG_';

export function groupFiles(
  srcPaths: string[],
  config: ModuleDirConfig,
  isSyncSpecific: boolean,
  target: string,
  siteConfig: SiteConfig,
) {
  const files: { key: string; data: { [key: string]: string } }[] = [];
  const langRe = new RegExp(`.(${siteConfig.langs.join('|')}){1}`, 'i');
  srcPaths.forEach(srcPath => {
    klawSync(srcPath, {
      nodir: false,
      filter: item => {
        if (config.hasSubDir && item.stats.isDirectory()) return true;
        return (
          path.extname(item.path) === '.md' && item.stats.size > 1 && !item.path.includes(`${path.sep}demo${path.sep}`)
        );
      },
    })
      .filter(item => path.extname(item.path) === '.md')
      .forEach(item => {
        // 避免用户名中存在 ‘.’ 的情况
        const username = os.userInfo().username;
        const cleanPath = item.path.replace(username, USERNAME_FLAG);
        const relativePath = cleanPath.split('.')[0].replace(USERNAME_FLAG, username);;
        const key = path.relative(srcPath, config.hasSubDir ? path.dirname(item.path) : relativePath).trim();
        if (key.length === 0) return;
        if (isSyncSpecific && key !== target) return;
        if (config.ignores && ~config.ignores.indexOf(key)) return;

        let sourceItem = files.find(w => w.key === key);
        if (!sourceItem) {
          sourceItem = {
            key,
            data: {},
          };
          files.push(sourceItem);
        }
        const langMatch = item.path.match(langRe);
        sourceItem.data[langMatch ? langMatch[1] : siteConfig.defaultLang] = item.path;
      });
  });
  return files;
}