import express from 'express';
import helmet from 'helmet';
import cors from 'cors';
import compression from 'compression';
import { env } from './config/env';
import { logger } from './utils/logger';
import { prisma } from './config/database';
import { redis } from './config/redis';
import { register, httpRequestDuration, httpRequestsTotal } from './utils/metrics';
import { errorHandler } from './middleware/error-handler';
import { authenticate } from './middleware/auth.middleware';
import { requireRole } from './middleware/rbac.middleware';
import { globalRateLimit, healthMetricsRateLimit } from './middleware/rate-limit';
import { authRouter } from './modules/auth/auth.routes';
import { usersRouter } from './modules/users/users.routes';
import { campaignsRouter } from './modules/influence/campaigns/campaigns.routes';
import { campaignEmailsPublicRouter, campaignEmailsAdminRouter } from './modules/influence/campaign-emails/campaign-emails.routes';
import { emailQueueRouter } from './modules/influence/email-queue/email-queue.routes';
import { representativesRouter } from './modules/influence/representatives/representatives.routes';
import { campaignPublicRouter } from './modules/influence/campaigns/campaigns-public.routes';
import { campaignUserRouter } from './modules/influence/campaigns/campaigns-user.routes';
import { campaignModerationRouter } from './modules/influence/campaigns/campaigns-moderation.routes';
import { responseCampaignPublicRouter, responsesPublicRouter, responsesAdminRouter } from './modules/influence/responses/responses.routes';
import { locationsAdminRouter, locationsPublicRouter } from './modules/map/locations/locations.routes';
import { bulkGeocodeRouter } from './modules/map/locations/bulk-geocode.routes';
import { cutsAdminRouter, cutsPublicRouter } from './modules/map/cuts/cuts.routes';
import { shiftsAdminRouter, shiftsPublicRouter, shiftsVolunteerRouter } from './modules/map/shifts/shifts.routes';
import shiftSeriesRouter from './modules/map/shifts/shift-series.routes';
import { mapSettingsRouter } from './modules/map/settings/settings.routes';
import { qrRouter } from './modules/qr/qr.routes';
import { listmonkRouter } from './modules/listmonk/listmonk.routes';
import { listmonkWebhookRouter } from './modules/listmonk/listmonk-webhook.routes';
import { pagesPublicRouter } from './modules/pages/pages-public.routes';
import { pagesAdminRouter } from './modules/pages/pages-admin.routes';
import { blocksRouter } from './modules/pages/blocks.routes';
import { docsRouter } from './modules/docs/docs.routes';
import { servicesRouter } from './modules/services/services.routes';
import { siteSettingsRouter } from './modules/settings/settings.routes';
import { canvassVolunteerRouter, canvassAdminRouter } from './modules/map/canvass/canvass.routes';
import { canvassExportRouter } from './modules/map/canvass/canvass-export.routes';
import { trackingVolunteerRouter, trackingAdminRouter } from './modules/map/tracking/tracking.routes';
import { geocodingRouter } from './modules/map/geocoding/geocoding.routes';
import { pangolinRouter } from './modules/pangolin/pangolin.routes';
import { rocketchatRouter } from './modules/rocketchat/rocketchat.routes';
import { rocketchatWebhookService } from './services/rocketchat-webhook.service';
import { narImportRouter } from './modules/map/locations/nar-import.routes';
import { areaImportRouter } from './modules/map/locations/area-import.routes';
import emailTemplatesRouter from './modules/email-templates/email-templates-admin.routes';
import { observabilityRouter } from './modules/observability/observability.routes';
import { dashboardRouter } from './modules/dashboard/dashboard.routes';
import { initEncryption } from './utils/crypto';
import { emailService } from './services/email.service';
import { emailQueueService } from './services/email-queue.service';
import { notificationQueueService } from './services/notification-queue.service';
import { geocodeQueueService } from './services/geocode-queue.service';
import { startProxy, stopProxy } from './services/listmonk-proxy.service';
import { pagesService } from './modules/pages/pages.service';
import { canvassService } from './modules/map/canvass/canvass.service';
import { trackingService } from './modules/map/tracking/tracking.service';
import { verificationTokenService } from './services/verification-token.service';
import { passwordResetTokenService } from './services/password-reset-token.service';
import { paymentsPublicRouter } from './modules/payments/payments-public.routes';
import { paymentsAdminRouter } from './modules/payments/payments-admin.routes';
import { webhookService } from './modules/payments/webhook.service';
import { galleryAdsPublicRouter } from './modules/gallery-ads/gallery-ads-public.routes';
import { galleryAdsAdminRouter } from './modules/gallery-ads/gallery-ads-admin.routes';
import { effectivenessRouter } from './modules/influence/effectiveness/effectiveness.routes';
import { docsAnalyticsPublicRouter, docsAnalyticsAdminRouter } from './modules/docs-analytics/docs-analytics.routes';
import { volunteerInviteRouter } from './modules/volunteer-invite/volunteer-invite.routes';
import { docsAnalyticsService } from './modules/docs-analytics/docs-analytics.service';

const app = express();

// Trust proxy for reverse proxy (nginx adds X-Forwarded-For)
app.set('trust proxy', 1);

// --- Middleware Stack ---
app.use(helmet({
  contentSecurityPolicy: env.NODE_ENV === 'production' ? undefined : false,
}));

app.use(cors({
  origin: env.CORS_ORIGINS.split(',').map(s => s.trim()),
  credentials: true,
}));

app.use(compression());

// Stripe webhook — must receive raw body BEFORE express.json() parses it
app.post('/api/payments/webhook', express.raw({ type: 'application/json' }), async (req, res) => {
  const signature = req.headers['stripe-signature'];
  if (!signature || typeof signature !== 'string') {
    res.status(400).json({ error: 'Missing stripe-signature header' });
    return;
  }
  try {
    const event = await webhookService.constructEvent(req.body as Buffer, signature);
    await webhookService.handleEvent(event);
    res.json({ received: true });
  } catch (err: unknown) {
    const message = err instanceof Error ? err.message : 'Webhook error';
    res.status(400).json({ error: message });
  }
});

app.use(express.json({ limit: '10mb' }));
app.use(express.urlencoded({ extended: true }));
app.use(globalRateLimit);

// Request metrics
app.use((req, res, next) => {
  const end = httpRequestDuration.startTimer();
  res.on('finish', () => {
    const route = req.route?.path || req.path;
    const labels = { method: req.method, route, status_code: res.statusCode.toString() };
    end(labels);
    httpRequestsTotal.inc(labels);
  });
  next();
});

// --- Health Check ---
app.get('/api/health', healthMetricsRateLimit, async (_req, res) => {
  const checks: Record<string, string> = {};

  try {
    await prisma.$queryRaw`SELECT 1`;
    checks.database = 'ok';
  } catch {
    checks.database = 'error';
  }

  try {
    await redis.ping();
    checks.redis = 'ok';
  } catch {
    checks.redis = 'error';
  }

  const healthy = Object.values(checks).every(v => v === 'ok');
  res.status(healthy ? 200 : 503).json({ status: healthy ? 'healthy' : 'degraded', checks });
});

// --- Metrics Endpoint (authenticated - SUPER_ADMIN only) ---
app.get('/api/metrics', authenticate, requireRole('SUPER_ADMIN'), healthMetricsRateLimit, async (_req, res) => {
  res.set('Content-Type', register.contentType);
  res.end(await register.metrics());
});

// --- API Routes ---
app.use('/api/auth', authRouter);
app.use('/api/users', usersRouter);
app.use('/api/campaigns', campaignPublicRouter);          // Public campaign details (no auth)
app.use('/api/campaigns', responseCampaignPublicRouter);  // Public response routes (no auth)
app.use('/api/campaigns', campaignEmailsPublicRouter);    // Public email routes (no auth)
app.use('/api/campaigns', campaignUserRouter);             // User campaign submission (auth, non-temp)
app.use('/api/campaigns', campaignModerationRouter);       // Moderation queue (admin auth)
app.use('/api/campaigns', campaignEmailsAdminRouter);     // Admin email routes (auth required)
app.use('/api/campaigns', campaignsRouter);               // Admin campaign CRUD (auth required)
app.use('/api/responses', responsesPublicRouter);         // Public response actions (no auth)
app.use('/api/responses', responsesAdminRouter);          // Admin response moderation (auth required)
app.use('/api/email-queue', emailQueueRouter);
app.use('/api/representatives', representativesRouter);
app.use('/api/map/locations', locationsPublicRouter);    // Public map data (no auth)
app.use('/api/map/locations', locationsAdminRouter);     // Admin location CRUD (auth required)
app.use('/api/map/locations/bulk-geocode', bulkGeocodeRouter); // Bulk re-geocoding (admin auth required)
app.use('/api/map/nar-import', narImportRouter);         // NAR server-side import (MAP_ADMIN+)
app.use('/api/map/area-import', areaImportRouter);       // Area import from multiple sources (MAP_ADMIN+)
app.use('/api/map/cuts', cutsPublicRouter);              // Public cut polygons (no auth)
app.use('/api/map/cuts', cutsAdminRouter);               // Admin cut CRUD (auth required)
app.use('/api/map/shifts', shiftsPublicRouter);          // Public shift listing + signup (no auth)
app.use('/api/map/shifts', shiftsVolunteerRouter);       // Volunteer shift signup (auth required)
app.use('/api/map/shifts/series', shiftSeriesRouter);    // Shift series management (MAP_ADMIN+)
app.use('/api/map/shifts', shiftsAdminRouter);           // Admin shift CRUD (auth required)
app.use('/api/map/geocoding', geocodingRouter);          // Geocoding search (MAP_ADMIN+)
app.use('/api/map/settings', mapSettingsRouter);         // Map settings (public GET, auth PUT)
app.use('/api/qr', qrRouter);                           // QR code generation (public)
app.use('/api/listmonk', listmonkWebhookRouter);         // Listmonk webhook (shared secret, no JWT)
app.use('/api/listmonk', listmonkRouter);               // Listmonk newsletter sync (SUPER_ADMIN)
app.use('/api/email-templates', emailTemplatesRouter);  // Email template management (ADMIN roles)
app.use('/api/pages', pagesPublicRouter);                // Public landing pages (no auth)
app.use('/api/pages', pagesAdminRouter);                 // Admin landing page CRUD (auth required)
app.use('/api/page-blocks', blocksRouter);               // Admin page block library (auth required)
app.use('/api/docs', docsRouter);                        // Docs status + config (auth required)
app.use('/api/services', servicesRouter);                // Platform services status (SUPER_ADMIN)
app.use('/api/map/canvass', canvassVolunteerRouter);       // Volunteer canvass routes (auth required)
app.use('/api/map/canvass', canvassAdminRouter);          // Admin canvass routes (MAP_ADMIN+)
app.use('/api/map/canvass', canvassExportRouter);        // Canvass-to-campaign export (admin roles)
app.use('/api/map/tracking', trackingVolunteerRouter);    // Volunteer GPS tracking (auth required)
app.use('/api/map/tracking', trackingAdminRouter);        // Admin GPS tracking (MAP_ADMIN+)
app.use('/api/settings', siteSettingsRouter);              // Site settings (public GET, SUPER_ADMIN PUT)
app.use('/api/pangolin', pangolinRouter);                  // Pangolin tunnel management (SUPER_ADMIN)
app.use('/api/rocketchat', rocketchatRouter);              // Rocket.Chat SSO + status (auth required)
app.use('/api/observability', observabilityRouter);        // Observability / monitoring (SUPER_ADMIN)
app.use('/api/dashboard', dashboardRouter);                  // Dashboard summary (ADMIN roles)
app.use('/api/payments', paymentsPublicRouter);              // Public payment routes (plans, checkout, my subscription)
app.use('/api/payments/admin', paymentsAdminRouter);         // Admin payment management (SUPER_ADMIN)
app.use('/api/influence/effectiveness', effectivenessRouter);   // Campaign effectiveness analytics (ADMIN)
app.use('/api/gallery-ads', galleryAdsPublicRouter);          // Public gallery ads (optional auth)
app.use('/api/gallery-ads/admin', galleryAdsAdminRouter);     // Admin gallery ad CRUD (SUPER_ADMIN)
app.use('/api/docs-analytics', docsAnalyticsPublicRouter);    // Public docs page view tracking (no auth)
app.use('/api/docs-analytics', docsAnalyticsAdminRouter);     // Admin docs analytics (ADMIN roles)
app.use('/api/volunteer-invite', volunteerInviteRouter);       // Quick join invite (admin generate + public redeem)

// --- Error Handler (must be last) ---
app.use(errorHandler);

// --- Start Server ---
async function start() {
  try {
    await prisma.$connect();
    logger.info('Database connected');

    // Initialize encryption for DB-stored secrets (SMTP password, etc.)
    // In production, require separate encryption key (not JWT secret reuse)
    if (env.NODE_ENV === 'production' && !env.ENCRYPTION_KEY) {
      throw new Error('ENCRYPTION_KEY must be set in production (do not reuse JWT_ACCESS_SECRET)');
    }
    if (!env.ENCRYPTION_KEY) {
      logger.warn('ENCRYPTION_KEY not set — falling back to JWT_ACCESS_SECRET for encryption. Set ENCRYPTION_KEY in production.');
    }
    initEncryption(env.ENCRYPTION_KEY || env.JWT_ACCESS_SECRET);

    // Warn if Listmonk sync is enabled but webhook secret is not configured
    if (env.LISTMONK_SYNC_ENABLED === 'true' && !env.LISTMONK_WEBHOOK_SECRET) {
      logger.warn('LISTMONK_SYNC_ENABLED is true but LISTMONK_WEBHOOK_SECRET is not set. Unsubscribe events from Listmonk will not be processed.');
    }

    // Rebuild SMTP transporter from DB settings (env fallback for empty fields)
    await emailService.rebuildTransporter();

    emailQueueService.startWorker();
    notificationQueueService.startWorker();
    geocodeQueueService.startWorker();
    startProxy();

    // Clean expired verification/reset tokens on startup + hourly
    verificationTokenService.cleanupExpiredTokens().catch(() => {});
    passwordResetTokenService.cleanupExpiredTokens().catch(() => {});
    setInterval(() => {
      verificationTokenService.cleanupExpiredTokens().catch(() => {});
      passwordResetTokenService.cleanupExpiredTokens().catch(() => {});
    }, 60 * 60 * 1000);

    // Close abandoned canvass sessions on startup + hourly
    canvassService.closeAbandonedSessions().catch(() => {});
    setInterval(() => {
      canvassService.closeAbandonedSessions().catch(() => {});
    }, 60 * 60 * 1000);

    // Clean old tracking data on startup + daily
    trackingService.cleanupOldData(30).catch(() => {});
    setInterval(() => trackingService.cleanupOldData(30).catch(() => {}), 24 * 60 * 60 * 1000);

    // Close stale tracking sessions (no data for 2h) — hourly
    trackingService.closeStaleTrackingSessions(120).catch(() => {});
    setInterval(() => trackingService.closeStaleTrackingSessions(120).catch(() => {}), 60 * 60 * 1000);

    // Clean old docs analytics data on startup + daily (90-day retention)
    docsAnalyticsService.cleanupOldData(90).catch(() => {});
    setInterval(() => docsAnalyticsService.cleanupOldData(90).catch(() => {}), 24 * 60 * 60 * 1000);

    // Setup Rocket.Chat notification channels (non-blocking)
    rocketchatWebhookService.setupChannels().catch(() => {});

    // Sync MkDocs overrides on startup
    pagesService.syncOverrides()
      .then(({ imported, updated }) => {
        if (imported > 0 || updated > 0) {
          logger.info(`Startup sync: imported ${imported}, updated ${updated} MkDocs overrides`);
        }
      })
      .catch((err) => {
        logger.warn('Startup sync of MkDocs overrides failed:', err);
      });

    // Validate MkDocs exports on startup
    pagesService.validateExports()
      .then(({ validated, repaired, errors }) => {
        if (repaired > 0 || errors.length > 0) {
          logger.info(`Validation: ${validated} checked, ${repaired} repaired, ${errors.length} errors`);
        }
      })
      .catch((err) => logger.warn('Validation failed:', err));

    // Schedule daily validation
    setInterval(() => {
      pagesService.validateExports().catch((err) => {
        logger.warn('Scheduled validation failed:', err);
      });
    }, 24 * 60 * 60 * 1000);

    app.listen(env.PORT, () => {
      logger.info(`API server running on port ${env.PORT} [${env.NODE_ENV}]`);
    });
  } catch (err) {
    logger.error('Failed to start server:', err);
    process.exit(1);
  }
}

start();

// Graceful shutdown
for (const signal of ['SIGTERM', 'SIGINT']) {
  process.on(signal, async () => {
    logger.info(`${signal} received, shutting down...`);
    await stopProxy();
    await emailQueueService.close();
    await notificationQueueService.close();
    await geocodeQueueService.close();
    await prisma.$disconnect();
    redis.disconnect();
    process.exit(0);
  });
}

export { app };