/**
 * @file config/config.js
 * @description Centralized configuration for Quick API.
 *              All configurable values live here.
 *              Environment variables take priority over defaults.
 *
 * Supported environment variables:
 *   PORT        - Listening port              (default: 3000)
 *   DATA_DIR    - Path to the JSON files      (default: ./data)
 *   BODY_LIMIT  - Maximum request body size   (default: 10mb)
 *   LOG_ENABLED - Enable HTTP request logging (default: true)
 */

'use strict';

const path = require('path');

const config = {
  /** Server listening port */
  port: parseInt(process.env.PORT || '3000', 10),

  /** Directory containing the JSON files to expose */
  dataDir: process.env.DATA_DIR
    ? path.resolve(process.env.DATA_DIR)
    : path.resolve(__dirname, '../../data'),

  /** Maximum request body size for POST requests */
  bodyLimit: process.env.BODY_LIMIT || '10mb',

  /** Enable HTTP request logging */
  logEnabled: process.env.LOG_ENABLED !== 'false',

  /** CORS configuration */
  cors: {
    origin: '*',
    exposedHeaders: ['X-Total-Count', 'X-Page', 'X-Limit'],
  },

  /** Default pagination values */
  pagination: {
    defaultPage:  1,
    defaultLimit: 0,   // 0 = no limit (returns all records)
    maxLimit:     500, // safety cap to avoid oversized responses
  },
};

module.exports = config;