const express = require('express');
const router = express.Router();
const { authenticateApiKey } = require('../middleware/auth');
const { rateLimit } = require('../middleware/rateLimit');
const { query } = require('../database/connection');
const { cacheGet, cacheSet } = require('../cache/redis');
const { logApiCall } = require('../services/analytics');

router.use(authenticateApiKey);
router.use(rateLimit);

router.get('/:ifsc_code', async (req, res, next) => {
  const startTime = Date.now();
  let success = false;

  try {
    const { ifsc_code } = req.params;
    const ifscRegex = /^[A-Z]{4}0[A-Z0-9]{6}$/;
    
    if (!ifscRegex.test(ifsc_code.toUpperCase())) {
      return res.status(400).json({
        success: false,
        error: { code: 'INVALID_IFSC', message: 'Invalid IFSC format' }
      });
    }

    const ifsc = ifsc_code.toUpperCase();
    const cacheKey = `ifsc:${ifsc}`;
    let data = await cacheGet(cacheKey);

    if (!data) {
      const result = await query('SELECT * FROM ifsc_codes WHERE ifsc = $1', [ifsc]);
      
      if (result.rows.length === 0) {
        return res.status(404).json({
          success: false,
          error: { code: 'IFSC_NOT_FOUND', message: 'IFSC not found' }
        });
      }

      data = result.rows[0];
      await cacheSet(cacheKey, data, 86400);
    }

    success = true;

    res.json({
      success: true,
      data: {
        ifsc: data.ifsc,
        bank: data.bank_name,
        branch: data.branch,
        address: data.address,
        city: data.city,
        district: data.district,
        state: data.state,
        contact: data.contact,
        upi: data.upi_enabled,
        rtgs: data.rtgs_enabled,
        neft: data.neft_enabled,
        imps: data.imps_enabled,
        micr: data.micr_code,
        swift: data.swift_code
      },
      meta: {
        request_id: `req_ifsc_${Date.now()}`,
        credits_used: 1,
        credits_remaining: req.user.remaining - 1
      }
    });

  } catch (error) {
    next(error);
  } finally {
    await logApiCall({
      userId: req.user.id,
      apiKeyId: req.user.apiKeyId,
      endpoint: '/v1/ifsc',
      method: 'GET',
      params: { ifsc: req.params.ifsc_code },
      status: success ? 200 : 500,
      duration: Date.now() - startTime,
      success,
      isTestKey: req.user.isTestKey
    });
  }
});

module.exports = router;