// 应用配置：读取根目录 config.json，再用环境变量覆盖（Docker 部署时主要靠环境变量）
import fs from 'node:fs';
import path from 'node:path';
import { isQualityKey, type QualityKey } from './core/quality.ts';

export const ROOT_DIR = path.resolve(import.meta.dirname, '../..');

export type Layout = 'album' | 'flat';

export interface DownloadDefaults {
  quality: QualityKey;
  layout: Layout;
  retries: number;
  lyric: boolean;
  translatedLyric: boolean;
  embedTags: boolean;
  albumCover: boolean;
}

export interface AppConfig {
  port: number;
  musicDir: string;
  dataDir: string;
  legacyHistoryFile: string | null;
  /** QQ 音乐 Cookie 文件；比已保存的新时自动导入 */
  qqCookieFile: string | null;
  netease: {
    apikey: string;
    music: string;
    lyric: string;
    search: string;
    playlist: string;
    baseUrl: string;
  };
  defaults: DownloadDefaults;
}

const DEFAULTS: AppConfig = {
  port: 8066,
  musicDir: 'music',
  dataDir: 'data',
  legacyHistoryFile: null,
  qqCookieFile: null,
  netease: {
    apikey: 'chksz_RGXIby7J6ok-GPa6nMrFgHgQtwEGD-hILAhZXpIa72Q',
    music: 'https://api.chksz.com/api/163_music',
    lyric: 'https://api.chksz.com/api/163_lyric',
    search: 'https://api.chksz.com/api/163_search',
    playlist: 'https://api.chksz.com/api/163_playlist',
    baseUrl: 'https://music.163.com',
  },
  defaults: {
    quality: 'master',
    layout: 'album',
    retries: 3,
    lyric: true,
    translatedLyric: true,
    embedTags: true,
    albumCover: true,
  },
};

function readJson(file: string): Record<string, any> {
  try {
    return JSON.parse(fs.readFileSync(file, 'utf-8'));
  } catch (e) {
    if ((e as NodeJS.ErrnoException).code !== 'ENOENT') {
      console.warn(`⚠️  配置文件读取失败，使用默认配置: ${(e as Error).message}`);
    }
    return {};
  }
}

function str(value: unknown, fallback: string): string {
  return typeof value === 'string' && value.trim() ? value.trim() : fallback;
}

function bool(value: unknown, fallback: boolean): boolean {
  if (typeof value === 'boolean') return value;
  if (value === 'true' || value === '1') return true;
  if (value === 'false' || value === '0') return false;
  return fallback;
}

function resolvePath(value: string): string {
  return path.isAbsolute(value) ? value : path.join(ROOT_DIR, value);
}

function loadConfig(): AppConfig {
  const file = readJson(path.join(ROOT_DIR, 'config.json'));
  const env = process.env;
  const ne = { ...DEFAULTS.netease, ...(file.netease || {}) };
  const df = { ...DEFAULTS.defaults, ...(file.defaults || {}) };
  const quality = str(env.DEFAULT_QUALITY, df.quality);
  const layout = str(env.DEFAULT_LAYOUT, df.layout);
  const retries = Number(env.DEFAULT_RETRIES ?? df.retries);

  return {
    port: Number(env.PORT || file.server?.port || DEFAULTS.port),
    musicDir: resolvePath(str(env.MUSIC_DIR, str(file.paths?.musicDir, DEFAULTS.musicDir))),
    dataDir: resolvePath(str(env.DATA_DIR, str(file.paths?.dataDir, DEFAULTS.dataDir))),
    legacyHistoryFile: env.LEGACY_HISTORY_FILE ? resolvePath(env.LEGACY_HISTORY_FILE) : null,
    qqCookieFile: env.QQ_COOKIE_FILE || file.qq?.cookieFile ? resolvePath(str(env.QQ_COOKIE_FILE, file.qq?.cookieFile)) : null,
    netease: {
      apikey: str(env.CHKSZ_API_KEY, str(ne.apikey, DEFAULTS.netease.apikey)),
      music: str(ne.music, DEFAULTS.netease.music),
      lyric: str(ne.lyric, DEFAULTS.netease.lyric),
      search: str(ne.search, DEFAULTS.netease.search),
      playlist: str(ne.playlist, DEFAULTS.netease.playlist),
      baseUrl: str(ne.baseUrl, DEFAULTS.netease.baseUrl).replace(/\/$/, ''),
    },
    defaults: {
      quality: isQualityKey(quality) ? quality : DEFAULTS.defaults.quality,
      layout: layout === 'flat' ? 'flat' : 'album',
      retries: Number.isInteger(retries) && retries > 0 ? retries : DEFAULTS.defaults.retries,
      lyric: bool(df.lyric, true),
      translatedLyric: bool(df.translatedLyric, true),
      embedTags: bool(df.embedTags, true),
      albumCover: bool(df.albumCover, true),
    },
  };
}

export const config = loadConfig();

fs.mkdirSync(config.musicDir, { recursive: true });
fs.mkdirSync(config.dataDir, { recursive: true });