import { Router } from 'express';
import { existsSync, accessSync, constants, statfsSync } from 'fs';
import { execFileSync } from 'child_process';
import { getAuthConfig } from './db.js';
import { getActiveDownloadCount } from './download.js';
import { getActiveScrapeCount } from './scrape.js';

const router = Router();
const MEDIA_PATH = process.env.MEDIA_PATH || './data/media';
const WVD_PATH = process.env.WVD_PATH || '/data/cdm/device.wvd';

router.get('/api/health', (req, res) => {
  const result = {
    uptime: Math.floor(process.uptime()),
    sqlite: false,
    authConfigured: false,
    mediaPathWritable: false,
    ffmpegAvailable: false,
    pythonAvailable: false,
    wvdPresent: false,
    diskSpace: null,
    activeDownloads: 0,
    activeScrapes: 0,
  };

  // SQLite check
  try {
    getAuthConfig(); // simple query to verify DB works
    result.sqlite = true;
  } catch { /* ignore */ }

  // Auth check
  try {
    result.authConfigured = !!getAuthConfig();
  } catch { /* ignore */ }

  // Media path writable
  try {
    accessSync(MEDIA_PATH, constants.W_OK);
    result.mediaPathWritable = true;
  } catch { /* ignore */ }

  // FFmpeg
  try {
    execFileSync('ffmpeg', ['-version'], { timeout: 5000, stdio: 'pipe' });
    result.ffmpegAvailable = true;
  } catch { /* ignore */ }

  // Python
  try {
    execFileSync('python3', ['--version'], { timeout: 5000, stdio: 'pipe' });
    result.pythonAvailable = true;
  } catch { /* ignore */ }

  // WVD file
  result.wvdPresent = existsSync(WVD_PATH);

  // Disk space
  try {
    const stats = statfsSync(MEDIA_PATH);
    result.diskSpace = {
      free: stats.bfree * stats.bsize,
      total: stats.blocks * stats.bsize,
    };
  } catch { /* ignore */ }

  // Active jobs
  result.activeDownloads = getActiveDownloadCount();
  result.activeScrapes = getActiveScrapeCount();

  res.json(result);
});

export default router;