import express from 'express';
import cors from 'cors';
import dotenv from 'dotenv';
import captureRoutes from './routes/capture.js';
import captureManager from './capture-manager.js';

dotenv.config();

const app = express();
const PORT = process.env.PORT || 3001;
const MAM_API_URL = process.env.MAM_API_URL || 'http://mam-api:3000';

app.use(cors());
app.use(express.json());

app.get('/health', (req, res) => {
  res.json({ status: 'ok' });
});

app.use('/capture', captureRoutes);

const server = app.listen(PORT, () => {
  console.log(`Wild Dragon Capture Service listening on port ${PORT}`);
  bootstrapAutoStart();
});

// Mapped from the env vars routes/recorders.js writes into the container.
// Empty strings collapse to undefined so capture-manager's defaults win.
function envOpt(name) {
  const v = process.env[name];
  return v === undefined || v === '' ? undefined : v;
}
function envInt(name) {
  const v = envOpt(name);
  if (v === undefined) return undefined;
  const n = parseInt(v, 10);
  return Number.isFinite(n) ? n : undefined;
}
function envBool(name) {
  const v = envOpt(name);
  if (v === undefined) return undefined;
  return v === 'true' || v === '1' || v === 'yes';
}

async function bootstrapAutoStart() {
  const recorderId = process.env.RECORDER_ID;
  const sourceType = process.env.SOURCE_TYPE;
  if (!recorderId || !sourceType) {
    console.log('[bootstrap] no RECORDER_ID/SOURCE_TYPE - on-demand sidecar');
    return;
  }

  const projectId = process.env.PROJECT_ID;
  const clipName  = process.env.CLIP_NAME;
  if (!projectId || !clipName) {
    console.error('[bootstrap] missing PROJECT_ID or CLIP_NAME - cannot start');
    return;
  }

  const listen = process.env.LISTEN === '1' || process.env.LISTEN === 'true';
  const listenPort = envInt('LISTEN_PORT');
  const streamKey = envOpt('STREAM_KEY');
  const sourceUrl = envOpt('SOURCE_URL');
  const device    = envInt('DEVICE_INDEX');

  console.log(`[bootstrap] starting ${sourceType} ingest (listen=${listen} port=${listenPort || 'n/a'})...`);
  try {
    const session = await captureManager.start({
      assetId: envOpt('ASSET_ID') || null,
      projectId,
      binId: envOpt('BIN_ID') || null,
      clipName,
      device,
      sourceType,
      sourceUrl,
      listen,
      listenPort,
      streamKey,

      // Recording codec — recorders.js passes these straight through
      videoCodec:    envOpt('RECORDING_CODEC')           || 'prores_hq',
      videoBitrate:  envOpt('RECORDING_VIDEO_BITRATE'),
      framerate:     envOpt('RECORDING_FRAMERATE'),
      audioCodec:    envOpt('RECORDING_AUDIO_CODEC')     || 'pcm_s24le',
      audioBitrate:  envOpt('RECORDING_AUDIO_BITRATE'),
      audioChannels: envInt('RECORDING_AUDIO_CHANNELS')  ?? 2,
      container:     envOpt('RECORDING_CONTAINER')       || 'mov',

      proxyEnabled:       envBool('PROXY_ENABLED') ?? true,
      proxyVideoCodec:    envOpt('PROXY_CODEC')          || 'h264',
      proxyVideoBitrate:  envOpt('PROXY_VIDEO_BITRATE')  || '8M',
      proxyFramerate:     envOpt('PROXY_FRAMERATE'),
      proxyAudioCodec:    envOpt('PROXY_AUDIO_CODEC')    || 'aac',
      proxyAudioBitrate:  envOpt('PROXY_AUDIO_BITRATE')  || '192k',
      proxyAudioChannels: envInt('PROXY_AUDIO_CHANNELS') ?? 2,
      proxyContainer:     envOpt('PROXY_CONTAINER')      || 'mp4',
    });
    console.log(`[bootstrap] session ${session.sessionId} started for clip ${clipName}`);
  } catch (err) {
    console.error('[bootstrap] failed to start capture:', err);
  }
}

let shuttingDown = false;
async function gracefulShutdown(signal) {
  if (shuttingDown) return;
  shuttingDown = true;
  console.log(`[shutdown] ${signal} received`);

  const status = captureManager.getStatus();

  if (status.recording) {
    console.log(`[shutdown] stopping active session ${status.sessionId}...`);
    try {
      const completed = await captureManager.stop(status.sessionId);
      console.log(`[shutdown] session ${completed.sessionId} finalised; duration=${completed.duration}s`);

      try {
        const res = await fetch(`${MAM_API_URL}/api/v1/assets`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            projectId:  completed.projectId,
            binId:      completed.binId,
            clipName:   completed.clipName,
            sourceType: completed.sourceType,
            hiresKey:   completed.hiresKey,
            proxyKey:   completed.proxyKey,
            needsProxy: completed.proxyKey === null,
            duration:   completed.duration,
            capturedAt: completed.startedAt,
          }),
        });
        if (!res.ok) {
          console.warn(`[shutdown] mam-api /assets returned ${res.status}: ${await res.text()}`);
        } else {
          console.log('[shutdown] asset registered with mam-api');
        }
      } catch (mamErr) {
        console.error('[shutdown] failed to register asset:', mamErr.message);
      }
    } catch (err) {
      console.error('[shutdown] error during stop:', err);
    }
  }

  server.close(() => {
    console.log('[shutdown] http server closed - exiting');
    process.exit(0);
  });

  setTimeout(() => process.exit(0), 5000).unref();
}

process.on('SIGTERM', () => gracefulShutdown('SIGTERM'));
process.on('SIGINT',  () => gracefulShutdown('SIGINT'));