import { and, eq } from 'drizzle-orm';
import { Router } from 'express';

import { db } from '../../db/client';
import { commands, deviceLinks, devices, streamSessions } from '../../db/schema';
import { simpleStreamingEnabled } from '../../media/config';
import { mediaProvider } from '../../media/service';
import { requireDeviceAuth } from '../../middleware/device-auth';
import { dispatchCommandById, sendRealtimeToDevice } from '../../realtime/gateway';
import { writeAuditLog } from '../../services/audit';
import { enqueuePushNotification } from '../../services/push';
import { createStreamRequestedPayload, toSimpleStreamSessionResponse } from '../../streaming/simple';
import { requestStreamSchema } from './schemas';
import { ensureStreamDeviceAuth } from './shared';

const router = Router();

router.post('/request', requireDeviceAuth, async (req, res) => {
  const parsed = requestStreamSchema.safeParse(req.body ?? {});

  if (!parsed.success) {
    res.status(400).json({ message: 'Invalid request body', errors: parsed.error.flatten() });
    return;
  }

  const deviceAuth = ensureStreamDeviceAuth(req, res);
  if (!deviceAuth) return;

  const [sourceDevice, cameraDevice] = await Promise.all([
    db.query.devices.findFirst({
      where: and(eq(devices.id, deviceAuth.deviceId), eq(devices.userId, deviceAuth.userId)),
    }),
    db.query.devices.findFirst({
      where: and(eq(devices.id, parsed.data.cameraDeviceId), eq(devices.userId, deviceAuth.userId)),
    }),
  ]);

  if (!sourceDevice || !cameraDevice) {
    res.status(404).json({ message: 'Source or camera device not found' });
    return;
  }

  if (sourceDevice.role !== 'client') {
    res.status(403).json({ message: 'Only client devices can request on-demand stream sessions' });
    return;
  }

  if (cameraDevice.role !== 'camera') {
    res.status(400).json({ message: 'cameraDeviceId must point to a camera device' });
    return;
  }

  const link = await db.query.deviceLinks.findFirst({
    where: and(
      eq(deviceLinks.ownerUserId, deviceAuth.userId),
      eq(deviceLinks.cameraDeviceId, cameraDevice.id),
      eq(deviceLinks.clientDeviceId, sourceDevice.id),
      eq(deviceLinks.status, 'active'),
    ),
  });

  if (!link) {
    res.status(403).json({ message: 'No active link between requester and camera' });
    return;
  }

  const now = new Date();

  const [session] = await db
    .insert(streamSessions)
    .values({
      ownerUserId: deviceAuth.userId,
      cameraDeviceId: cameraDevice.id,
      requesterDeviceId: sourceDevice.id,
      status: 'requested',
      reason: parsed.data.reason,
      metadata: parsed.data.metadata ?? null,
      mediaProvider: mediaProvider.name,
      updatedAt: now,
    })
    .returning();

  if (!session) {
    res.status(500).json({ message: 'Failed creating stream session' });
    return;
  }

  if (simpleStreamingEnabled) {
    const requestPayload = createStreamRequestedPayload(session);
    const deliveredToCamera = sendRealtimeToDevice(cameraDevice.id, 'stream:requested', requestPayload);

    console.info('[stream.request]', {
      streamSessionId: session.id,
      requesterDeviceId: sourceDevice.id,
      cameraDeviceId: cameraDevice.id,
      mode: 'simple',
    });

    sendRealtimeToDevice(sourceDevice.id, 'stream:requested', requestPayload);

    if (!deliveredToCamera) {
      await enqueuePushNotification({
        ownerUserId: cameraDevice.userId,
        recipientDeviceId: cameraDevice.id,
        type: 'stream_requested',
        payload: requestPayload,
      });
    }

    res.status(201).json({
      message: 'Stream request sent',
      streamSession: toSimpleStreamSessionResponse(session),
    });

    await writeAuditLog({
      ownerUserId: sourceDevice.userId,
      actorDeviceId: sourceDevice.id,
      action: 'stream.requested',
      targetType: 'stream_session',
      targetId: session.id,
      metadata: { cameraDeviceId: cameraDevice.id, reason: session.reason, transport: 'webrtc' },
      ipAddress: req.ip,
    });
    return;
  }

  const [command] = await db
    .insert(commands)
    .values({
      ownerUserId: deviceAuth.userId,
      sourceDeviceId: sourceDevice.id,
      targetDeviceId: cameraDevice.id,
      commandType: 'start_stream',
      payload: {
        streamSessionId: session.id,
        reason: session.reason,
      },
      status: 'queued',
      retryCount: 0,
      lastDispatchedAt: now,
      updatedAt: now,
    })
    .returning();

  if (!command) {
    res.status(500).json({ message: 'Failed creating stream command' });
    return;
  }

  await dispatchCommandById(command.id);
  console.info('[stream.request]', {
    streamSessionId: session.id,
    requesterDeviceId: sourceDevice.id,
    cameraDeviceId: cameraDevice.id,
    mode: 'legacy',
    commandId: command.id,
  });

  const refreshedCommand = await db.query.commands.findFirst({ where: eq(commands.id, command.id) });

  const deliveredToRequester = sendRealtimeToDevice(sourceDevice.id, 'stream:requested', {
    streamSessionId: session.id,
    cameraDeviceId: cameraDevice.id,
    status: session.status,
    reason: session.reason,
  });

  if (!deliveredToRequester) {
    await enqueuePushNotification({
      ownerUserId: sourceDevice.userId,
      recipientDeviceId: sourceDevice.id,
      type: 'stream_requested',
      payload: {
        streamSessionId: session.id,
        cameraDeviceId: cameraDevice.id,
      },
    });
  }

  res.status(201).json({
    message: 'Stream request sent',
    streamSession: session,
    command: refreshedCommand ?? command,
  });

  await writeAuditLog({
    ownerUserId: sourceDevice.userId,
    actorDeviceId: sourceDevice.id,
    action: 'stream.requested',
    targetType: 'stream_session',
    targetId: session.id,
    metadata: { cameraDeviceId: cameraDevice.id, reason: session.reason },
    ipAddress: req.ip,
  });
});

export default router;