const config = require('../config');
const database = require('../database');
const apiClient = require('../api-client');
const printer = require('../printer');

// Middleware to check authentication via signed cookie (JSON response)
async function requireAuth(req, reply) {
  const raw = req.cookies && req.cookies.kitchen_session;
  if (!raw) { return reply.code(401).send({ error: true, message: 'Not authenticated' }); }
  const { valid, value } = req.unsignCookie(raw || '');
  if (!valid) { return reply.code(401).send({ error: true, message: 'Not authenticated' }); }
  const token = config.get('authToken');
  const expiry = config.get('tokenExpiry');
  const apiClient = require('../api-client');
  if (!token || apiClient.isTokenExpired(expiry) || value !== token) {
    return reply.code(401).send({ error: true, message: 'Not authenticated' });
  }
}

async function ordersRoutes(fastify, options) {

  // Get orders with filters
  fastify.get('/api/orders', { preHandler: requireAuth }, async (req, reply) => {
    const filters = {
      status: req.query.status,
      limit: parseInt(req.query.limit, 10) || 50
    };

    // Get today's date for stats
    const today = new Date();
    filters.date = today;

    const orders = database.getOrders(filters);
    const stats = database.getOrderStats();

    return { error: false, orders, stats };
  });

  // Update order status
  fastify.post('/api/orders/:id/status', { preHandler: requireAuth }, async (req, reply) => {
    const orderId = parseInt(req.params.id, 10);
    const { status } = req.body;

    if (!status) {
      return { error: true, message: 'Status is required' };
    }

    // Valid local statuses
    const validStatuses = ['new', 'preparing', 'ready', 'completed'];
    if (!validStatuses.includes(status)) {
      return { error: true, message: 'Invalid status' };
    }

    try {
      // Update local database
      database.updateOrderStatus(orderId, status);

      // Sync to backend if status is completed (maps to finished)
      if (status === 'completed') {
        const appConfig = config.getAll();
        const order = database.getOrderById(orderId);
        
        if (order && appConfig.authToken && appConfig.selectedBotId) {
          // Determine the action based on order type
          let action = 'finished';
          if (order.order.type === 'delivery') {
            action = 'delivered';
          } else if (order.order.type === 'pickup') {
            action = 'picked_up';
          }

          const result = await apiClient.modifyOrder(
            appConfig.authToken,
            appConfig.selectedBotId,
            orderId,
            action
          );

          if (result.error) {
            console.error('Failed to sync order status to backend:', result.message);
          }
        }
      }

      return { error: false };
    } catch (error) {
      console.error('Failed to update order status:', error.message);
      return { error: true, message: 'Failed to update order status' };
    }
  });

  // Cancel order
  fastify.post('/api/orders/:id/cancel', { preHandler: requireAuth }, async (req, reply) => {
    const orderId = parseInt(req.params.id, 10);
    const { reason } = req.body;

    try {
      // Check if cancellation already printed to prevent duplicates
      if (database.hasPrintedCancellation(orderId)) {
        console.log(`[API] Cancellation already printed for order #${orderId}, skipping duplicate`);
        database.updateOrderStatus(orderId, 'canceled');
        return { error: false, message: 'Order already canceled' };
      }

      // Update local database
      database.updateOrderStatus(orderId, 'canceled');

      // Sync to backend
      const appConfig = config.getAll();
      if (appConfig.authToken && appConfig.selectedBotId) {
        const result = await apiClient.modifyOrder(
          appConfig.authToken,
          appConfig.selectedBotId,
          orderId,
          'cancel',
          reason || 'Canceled by kitchen'
        );

        if (result.error) {
          console.error('Failed to sync cancellation to backend:', result.message);
        }
      }

      // Print cancellation receipt
      const order = database.getOrderById(orderId);
      if (order) {
        try {
          // Add to print queue with deduplication check
          const jobId = database.addToPrintQueue(orderId, 'canceled');
          if (!jobId) {
            console.log(`[API] Cancellation print job not created (duplicate prevention) for order #${orderId}`);
            return { error: false, message: 'Cancellation recorded' };
          }

          database.markPrintJobProcessing(jobId);
          
          // Get enabled printers from database
          const printerConfigs = database.getEnabledPrinters();
          let result;
          
          if (printerConfigs && printerConfigs.length > 0) {
            // Use new per-printer config system
            result = await printer.printOrderReceiptWithPrinterConfigs(
              order, 
              printerConfigs, 
              'canceled', 
              { reason: reason || 'Canceled by kitchen' }
            );
          } else {
            // Fallback to legacy system if no printer configs
            if (!printer.printer) {
              printer.initializePrinter(appConfig);
            }
            result = await printer.printOrderReceipt(order, 'canceled', { reason: reason || 'Canceled by kitchen' });
          }
          
          if (result && result.success) {
            database.markOrderPrinted(orderId);
            database.markPrintJobCompleted(jobId);
            // Cleanup any other pending jobs for this order+type
            database.cleanupDuplicateJobs(jobId, orderId, 'canceled');
          } else {
            // Mark as pending for worker retry
            database.markPrintJobPending(jobId);
          }
        } catch (error) {
          console.error('Failed to print cancellation receipt:', error.message);
          // Let the worker retry - find the job and mark it pending
          try {
            const lastJobIdRow = database.db.prepare("SELECT id FROM print_queue WHERE order_id = ? AND print_type = 'canceled' ORDER BY id DESC LIMIT 1").get(orderId);
            if (lastJobIdRow && lastJobIdRow.id) { database.markPrintJobPending(lastJobIdRow.id); }
          } catch (_) {}
        }
      }

      return { error: false };
    } catch (error) {
      console.error('Failed to cancel order:', error.message);
      return { error: true, message: 'Failed to cancel order' };
    }
  });

  // Reprint order
  fastify.post('/api/orders/:id/reprint', { preHandler: requireAuth }, async (req, reply) => {
    const orderId = parseInt(req.params.id, 10);

    try {
      const order = database.getOrderById(orderId);

      if (!order) {
        return { error: true, message: 'Order not found' };
      }

      const printType = order.localStatus === 'canceled' ? 'canceled' : 'new';
      
      // Check for recent ACTIVE job to prevent double-enqueue while in-flight
      const activeCheck = database.hasActiveOrRecentJob(orderId, 'reprint', 10);
      if (activeCheck.hasActive && (activeCheck.status === 'pending' || activeCheck.status === 'processing')) {
        console.log(`[API] Reprint request for order #${orderId} blocked - active job ${activeCheck.jobId} (${activeCheck.status}) exists`);
        return { error: false, message: 'Print already in progress' };
      }

      // Add to print queue with deduplication
      const jobId = database.addToPrintQueue(orderId, 'reprint');
      if (!jobId) {
        console.log(`[API] Reprint job not created (duplicate prevention) for order #${orderId}`);
        return { error: false, message: 'Print recently completed, skipping duplicate' };
      }
      
      database.markPrintJobProcessing(jobId);

      // Print receipt using per-printer configs
      const printerConfigs = database.getEnabledPrinters();
      
      let result;
      if (printerConfigs && printerConfigs.length > 0) {
        // Use new per-printer config system
        result = await printer.printOrderReceiptWithPrinterConfigs(order, printerConfigs, printType, { cooldownMs: 2000 });
      } else {
        // Fallback to legacy system
        const appConfig = config.getAll();
        printer.initializePrinter(appConfig);
        result = await printer.printOrderReceipt(order, printType, { cooldownMs: 2000 });
      }

      if (result && result.success) {
        database.markOrderPrinted(orderId);
        database.markPrintJobCompleted(jobId);
        // Cleanup any other pending jobs for this order+type
        database.cleanupDuplicateJobs(jobId, orderId, 'reprint');
        return { error: false, message: (result && result.message) ? result.message : 'Receipt sent to printer' };
      } else {
        // Mark as pending so the worker can retry when printer is online
        database.markPrintJobPending(jobId);
        return { error: true, message: result.error || 'Print failed' };
      }
    } catch (error) {
      console.error('Failed to reprint order:', error.message);
      try { database.resetStuckProcessingJobs(60); } catch (_) {}
      return { error: true, message: 'Failed to reprint order' };
    }
  });

  // Get single order details
  fastify.get('/api/orders/:id', { preHandler: requireAuth }, async (req, reply) => {
    const orderId = parseInt(req.params.id, 10);
    const order = database.getOrderById(orderId);

    if (!order) {
      return { error: true, message: 'Order not found' };
    }

    return { error: false, order };
  });

  // Manual sync trigger (for testing/debugging)
  fastify.post('/api/sync-now', { preHandler: requireAuth }, async (req, reply) => {
    try {
      // Trigger the poller manually
      if (fastify.orderPoller) {
        fastify.orderPoller.poll();
        return { error: false, message: 'Manual sync triggered' };
      } else {
        return { error: true, message: 'Order poller not available' };
      }
    } catch (error) {
      console.error('Manual sync error:', error.message);
      return { error: true, message: error.message };
    }
  });

  // Health check for external API server
  fastify.get('/api/health/external', { preHandler: requireAuth }, async (req, reply) => {
    try {
      const appConfig = config.getAll();
      const token = appConfig.authToken;
      const botId = appConfig.selectedBotId;

      if (!token || !botId) {
        return {
          error: false,
          status: 'unconfigured',
          message: 'API not configured',
          timestamp: new Date().toISOString()
        };
      }

      // Check if token is expired
      if (apiClient.isTokenExpired(appConfig.tokenExpiry)) {
        return {
          error: false,
          status: 'offline',
          message: 'Token expired',
          timestamp: new Date().toISOString()
        };
      }

      // Try to fetch bots list as a lightweight health check
      const startTime = Date.now();
      const result = await apiClient.getBots(token);
      const responseTime = Date.now() - startTime;

      if (result.error) {
        return {
          error: false,
          status: 'offline',
          message: result.message || 'API server unreachable',
          responseTime: responseTime,
          timestamp: new Date().toISOString()
        };
      }

      return {
        error: false,
        status: 'online',
        message: 'API server connected',
        responseTime: responseTime,
        timestamp: new Date().toISOString()
      };
    } catch (error) {
      console.error('External API health check error:', error.message);
      return {
        error: false,
        status: 'offline',
        message: error.message || 'Health check failed',
        timestamp: new Date().toISOString()
      };
    }
  });

  // Health check for local dashboard server
  fastify.get('/api/health/local', { preHandler: requireAuth }, async (req, reply) => {
    return {
      error: false,
      status: 'online',
      message: 'Local server connected',
      timestamp: new Date().toISOString()
    };
  });
}

module.exports = ordersRoutes;