// Copyright (c) 2026 Gordon Bolton. MIT License.
const express = require('express');
const router = express.Router();
const requireAuth = require('../middleware/requireAuth');
const cache = require('../utils/cache');
const { getLastPollTimings, POLLING_ENABLED } = require('../utils/poller');
const { getSonarrInstances, getRadarrInstances, getOmbiInstances } = require('../utils/config');
const { getGlobalWebhookMetrics } = require('../utils/cache');
const { checkWebhookConfigured, checkOmbiWebhookConfigured, aggregateMetrics } = require('../services/WebhookStatus');

/**
 * @openapi
 * /api/status/status:
 *   get:
 *     tags: [Status]
 *     summary: Get server status (admin-only)
 *     description: |
 *       Admin-only endpoint returning server metrics, cache statistics, polling information,
 *       and webhook metrics. Used by the admin status panel to monitor sofarr health.
 *
 *       **Authentication:** Requires valid `emby_user` cookie (admin only).
 *
 *       **Response Structure:**
 *       - `server`: Uptime, Node version, memory usage
 *       - `polling`: Polling enabled status, interval, last poll timings
 *       - `cache`: Cache statistics (item count, sizes, TTLs)
 *       - `webhooks`: Webhook configuration and metrics for Sonarr/Radarr
 *
 *       **Webhook Metrics:**
 *       - `configured`: Whether webhook is configured in Sonarr/Radarr
 *       - `eventsReceived`: Total webhook events received
 *       - `lastWebhookTimestamp`: Last webhook event time
 *       - `pollsSkipped`: Number of poll cycles skipped due to recent webhook activity
 *
 *       **x-integration-notes:** This endpoint is used by the admin status panel to display:
 *       - Server health and resource usage
 *       - Polling performance and timing
 *       - Cache hit rates and sizes
 *       - Webhook activity and smart polling effectiveness
 *     security:
 *       - CookieAuth: []
 *     responses:
 *       '200':
 *         description: Status data
 *         content:
 *           application/json:
 *             schema:
 *               $ref: '#/components/schemas/StatusResponse'
 *             example:
 *               server:
 *                 uptimeSeconds: 3600
 *                 nodeVersion: "v22.0.0"
 *                 memoryUsageMB: 128.5
 *                 heapUsedMB: 64.2
 *                 heapTotalMB: 128.0
 *               polling:
 *                 enabled: true
 *                 intervalMs: 5000
 *                 lastPoll:
 *                   sabnzbdQueue: 150
 *                   sonarrQueue: 200
 *               cache:
 *                 "poll:sab-queue":
 *                   size: 2456
 *                   items: 1
 *                   ttlRemaining: 12000
 *               webhooks:
 *                 sonarr:
 *                   configured: true
 *                   eventsReceived: 42
 *                   lastWebhookTimestamp: "2026-05-21T10:00:00.000Z"
 *                   pollsSkipped: 15
 *                 radarr:
 *                   configured: true
 *                   eventsReceived: 38
 *                   lastWebhookTimestamp: "2026-05-21T09:55:00.000Z"
 *                   pollsSkipped: 12
 *       '403':
 *         description: Admin access required
 *         content:
 *           application/json:
 *             schema:
 *               $ref: '#/components/schemas/ErrorResponse'
 *             example:
 *               error: "Admin access required"
 *       '500':
 *         description: Server error
 *         content:
 *           application/json:
 *             schema:
 *               $ref: '#/components/schemas/ErrorResponse'
 *     x-code-samples:
 *       - lang: curl
 *         label: cURL
 *         source: |
 *           curl -X GET http://localhost:3001/api/status/status \
 *             -b cookies.txt
 *       - lang: JavaScript
 *         label: JavaScript (fetch)
 *         source: |
 *           const response = await fetch('http://localhost:3001/api/status/status', {
 *             method: 'GET',
 *             credentials: 'include'
 *           });
 *           const data = await response.json();
 *           console.log('Uptime:', data.server.uptimeSeconds);
 */
router.get('/', requireAuth, async (req, res) => {
  try {
    const user = req.user;
    if (!user.isAdmin) {
      return res.status(403).json({ error: 'Admin access required' });
    }

    const cacheStats = cache.getStats();
    const uptime = process.uptime();

    // Get webhook metrics
    const webhookMetrics = getGlobalWebhookMetrics();

    // Check webhook configuration for each service
    const sonarrInstances = getSonarrInstances();
    const radarrInstances = getRadarrInstances();
    const ombiInstances = getOmbiInstances();

    const sonarrWebhookConfigured = sonarrInstances.length > 0
      ? await checkWebhookConfigured(sonarrInstances[0], 'Sonarr')
      : false;
    const radarrWebhookConfigured = radarrInstances.length > 0
      ? await checkWebhookConfigured(radarrInstances[0], 'Radarr')
      : false;
    const ombiWebhookConfigured = ombiInstances.length > 0
      ? await checkOmbiWebhookConfigured(ombiInstances[0])
      : false;

    // Find Sonarr, Radarr, and Ombi metrics from instances
    const sonarrMetrics = {};
    const radarrMetrics = {};
    const ombiMetrics = {};
    for (const [url, metrics] of Object.entries(webhookMetrics.instances || {})) {
      if (url.includes('sonarr')) {
        sonarrMetrics[url] = metrics;
      } else if (url.includes('radarr')) {
        radarrMetrics[url] = metrics;
      } else if (url.includes('ombi') || (ombiInstances.length > 0 && url === ombiInstances[0].url)) {
        ombiMetrics[url] = metrics;
      }
    }

    res.json({
      server: {
        uptimeSeconds: Math.floor(uptime),
        nodeVersion: process.version,
        memoryUsageMB: Math.round(process.memoryUsage().rss / 1024 / 1024 * 10) / 10,
        heapUsedMB: Math.round(process.memoryUsage().heapUsed / 1024 / 1024 * 10) / 10,
        heapTotalMB: Math.round(process.memoryUsage().heapTotal / 1024 / 1024 * 10) / 10
      },
      polling: {
        enabled: POLLING_ENABLED,
        intervalMs: POLLING_ENABLED ? require('../utils/poller').POLL_INTERVAL : 0,
        lastPoll: getLastPollTimings()
      },
      cache: cacheStats,
      webhooks: {
        sonarr: aggregateMetrics(sonarrMetrics, sonarrWebhookConfigured),
        radarr: aggregateMetrics(radarrMetrics, radarrWebhookConfigured),
        ombi: aggregateMetrics(ombiMetrics, ombiWebhookConfigured)
      }
    });
  } catch (err) {
    res.status(500).json({ error: 'Failed to get status', details: err.message });
  }
});

module.exports = router;