import 'dotenv/config';
import express from 'express';
import cors from 'cors';
import path from 'path';
import checkDiskSpace from 'check-disk-space';
import { config } from './config';
import { initDatabase, ensureStorageDirs, cleanupOldTempFiles } from './services/storage';
import { checkFFmpegInstalled } from './services/ffmpeg';
import streamRouter from './routes/stream';
import hlsRouter from './routes/hls';
import frameRouter from './routes/frame';
import uploadRouter from './routes/upload';
import metaRouter from './routes/meta';
import annotationsRouter from './routes/annotations';
import geoRouter from './routes/geo';
import elevationRouter from './routes/elevation';
import tileRouter from './routes/tile';
import cameraRouter from './routes/camera';

const app = express();

// 내부 네트워크 접근 허용: 모든 origin 허용 (사내 단일 사용자 도구)
app.use(cors({ origin: true }));

// Raw body parser for chunk uploads (must come before express.json)
app.use('/api/upload/chunk', express.raw({ type: 'application/octet-stream', limit: '110mb' }));

app.use(express.json());

// Routes
app.use('/api/stream', streamRouter);
app.use('/api/hls', hlsRouter);
app.use('/api/frame', frameRouter);
app.use('/api/upload', uploadRouter);
app.use('/api/videos', metaRouter);
app.use('/api/meta', metaRouter);
app.use('/api/annotations/:videoId', annotationsRouter);
app.use('/api/geo', geoRouter);
app.use('/api/elevation', elevationRouter);
app.use('/api/tile', tileRouter);
app.use('/api/camera', cameraRouter);

app.get('/api/health', (_req, res) => {
  res.json({ status: 'ok', timestamp: new Date().toISOString() });
});

// 프로덕션 빌드 정적 파일 서빙 (client/dist)
const clientDistPath = path.resolve(__dirname, '../../../../client/dist');
// CSP 헤더: 브라우저 확장 프로그램의 스크립트 주입 차단
const cspHeader =
  "default-src 'self'; " +
  "script-src 'self'; " +
  "style-src 'self' 'unsafe-inline'; " +
  "font-src 'self' data:; " +
  "img-src 'self' blob: data:; " +
  "media-src 'self' blob:; " +
  "connect-src 'self'; " +
  "worker-src 'self' blob:;";
app.use((req, res, next) => {
  if (!req.path.startsWith('/api')) {
    res.setHeader('Content-Security-Policy', cspHeader);
  }
  next();
});
app.use(express.static(clientDistPath));
// SPA fallback: API가 아닌 모든 요청은 index.html로
app.get('*', (req, res, next) => {
  if (req.path.startsWith('/api')) return next();
  res.sendFile(path.join(clientDistPath, 'index.html'));
});

// Error handler
app.use((err: Error, _req: express.Request, res: express.Response, _next: express.NextFunction) => {
  console.error('[error]', err.message);
  res.status(500).json({ error: err.message });
});

async function start(): Promise<void> {
  // Check FFmpeg
  const ffmpegOk = await checkFFmpegInstalled();
  if (!ffmpegOk) {
    console.warn('[warn] FFmpeg not found in PATH. Frame extraction and HLS conversion will fail.');
  } else {
    console.log('[ffmpeg] detected OK');
  }

  // Init storage dirs + DB
  await ensureStorageDirs();
  initDatabase();

  // Startup cleanup
  await cleanupOldTempFiles();

  // Disk space check every hour
  setInterval(async () => {
    try {
      const space = await checkDiskSpace(path.resolve(config.videosDir));
      const freeGB = space.free / (1024 ** 3);
      if (freeGB < 10) {
        console.warn(`[disk] WARNING: only ${freeGB.toFixed(1)}GB free`);
      }
    } catch { /* ignore */ }
  }, 60 * 60 * 1000);

  // Periodic cleanup every hour
  setInterval(() => cleanupOldTempFiles(), 60 * 60 * 1000);

  app.listen(config.port, '0.0.0.0', () => {
    console.log(`[server] running on http://0.0.0.0:${config.port}`);
  });
}

start().catch(console.error);

export default app;