import { Hono } from 'hono';
import type { Env } from './types';
import { webhookRouter } from './routes/webhook';
import { apiRouter } from './routes/api';
import { healthRouter } from './routes/health';
import { setWebhook, getWebhookInfo } from './telegram';
import { timingSafeEqual } from './security';
import { validateEnv } from './utils/env-validation';
import { createLogger } from './utils/logger';

const logger = createLogger('worker');

let envValidated = false;

const app = new Hono<{ Bindings: Env }>();

// Environment validation middleware (runs once per worker instance)
app.use('*', async (c, next) => {
  if (!envValidated) {
    const result = validateEnv(c.env as unknown as Record<string, unknown>);
    if (!result.success) {
      logger.error('Environment validation failed', new Error('Invalid configuration'), {
        errors: result.errors,
      });
      return c.json({
        error: 'Configuration error',
        message: 'The worker is not properly configured.',
      }, 500);
    }

    if (result.warnings.length > 0) {
      logger.warn('Environment configuration warnings', { warnings: result.warnings });
    }

    logger.info('Environment validation passed', {
      environment: c.env.ENVIRONMENT || 'production',
      warnings: result.warnings.length,
    });

    envValidated = true;
  }

  return await next();
});

// Health check
app.route('/health', healthRouter);

// Setup webhook
app.get('/setup-webhook', async (c) => {
  const env = c.env;
  if (!env.BOT_TOKEN || !env.WEBHOOK_SECRET) {
    return c.json({ error: 'Server configuration error' }, 500);
  }

  const token = c.req.query('token');
  const secret = c.req.query('secret');
  if (!token || !timingSafeEqual(token, env.BOT_TOKEN)) {
    return c.text('Unauthorized', 401);
  }
  if (!secret || !timingSafeEqual(secret, env.WEBHOOK_SECRET)) {
    return c.text('Unauthorized', 401);
  }

  const webhookUrl = `${new URL(c.req.url).origin}/webhook`;
  const result = await setWebhook(env.BOT_TOKEN, webhookUrl, env.WEBHOOK_SECRET);
  return c.json(result);
});

// Webhook info
app.get('/webhook-info', async (c) => {
  const env = c.env;
  if (!env.BOT_TOKEN || !env.WEBHOOK_SECRET) {
    return c.json({ error: 'Server configuration error' }, 500);
  }

  const token = c.req.query('token');
  const secret = c.req.query('secret');
  if (!token || !timingSafeEqual(token, env.BOT_TOKEN)) {
    return c.text('Unauthorized', 401);
  }
  if (!secret || !timingSafeEqual(secret, env.WEBHOOK_SECRET)) {
    return c.text('Unauthorized', 401);
  }

  const result = await getWebhookInfo(env.BOT_TOKEN);
  return c.json(result);
});

// API routes
app.route('/api', apiRouter);

// Telegram Webhook
app.route('/webhook', webhookRouter);

// Root
app.get('/', (c) => {
  return c.text(
    `Telegram AI Support Bot

Endpoints:
  GET  /health        - Health check
  GET  /webhook-info  - Webhook status
  GET  /setup-webhook - Configure webhook
  POST /webhook       - Telegram webhook (authenticated)
  GET  /api/*         - Admin API (authenticated)`,
    200
  );
});

// 404
app.notFound((c) => c.text('Not Found', 404));

export default {
  fetch: app.fetch,

  async queue(batch: MessageBatch, env: Env): Promise<void> {
    const { dispatchQueueMessage } = await import('./consumers/queue-dispatcher');
    const queueLogger = createLogger('queue');

    for (const msg of batch.messages) {
      try {
        await dispatchQueueMessage(msg.body, env);
        msg.ack();
      } catch (error) {
        queueLogger.error('Queue message processing failed', error as Error, {
          queue: batch.queue,
          messageId: msg.id,
        });
        msg.retry();
      }
    }
  },

  async scheduled(event: ScheduledEvent, env: Env, _ctx: ExecutionContext): Promise<void> {
    const cronSchedule = event.cron;
    logger.info('Cron job started', { schedule: cronSchedule });

    const {
      cleanupExpiredSessions,
      sendExpiryNotifications,
      archiveOldConversations,
      cleanupStaleOrders,
      monitoringCheck,
      notifyServerStatusChanges,
      notifyTransactionStatusChanges,
      sendPaymentReminders,
      notifyBankMatches,
    } = await import('./services/cron-jobs');

    try {
      switch (cronSchedule) {
        // Midnight KST (15:00 UTC): expiry notifications, archiving, session cleanup
        case '0 15 * * *':
          await sendExpiryNotifications(env);
          await archiveOldConversations(env);
          await cleanupExpiredSessions(env);
          break;

        // Every 5 minutes: stale cleanup + proactive notifications
        case '*/5 * * * *':
          await cleanupStaleOrders(env);
          await notifyServerStatusChanges(env);
          await notifyTransactionStatusChanges(env);
          await notifyBankMatches(env);
          break;

        // Every hour: monitoring checks + payment reminders
        case '0 * * * *':
          await monitoringCheck(env);
          await sendPaymentReminders(env);
          break;

        default:
          logger.warn('Unknown cron schedule', { schedule: cronSchedule });
      }
    } catch (error) {
      logger.error('Cron job failed', error as Error, { schedule: cronSchedule });
    }
  },
};