import dotenv from 'dotenv'

import Utils from './Util/Utils.js'

// important for dev env to load .env file
dotenv.config()

/**
 * Class containing global constants and configurations for the application.
 */
export default class Globals {
  /**
   * A constant string representing an error message for input validation failure.
   */
  public static ErrorResponseValidationFail = 'Input validation failed: ' //400
  /**
   * A constant string representing an error response for an invalid server response.
   */
  public static ErrorResponseInvalidServerResponse = 'No valid response, this is a system error.' //400
  /**
   * The error message for an unhandled error when processing a request.
   */
  public static ErrorResponseUnhandledError = 'Unhandled error when processing request.' //400
  /**
   * A static string representing an error response when there are no records to be processed.
   */
  public static ErrorResponseNoRecords = 'No events to be processed.' //400
  /**
   * Represents an error code for a missing parameter.
   * @type {string}
   */
  public static ErrorCode_MissingParam = 'MISSING_PARAM'
  /**
   * Represents an error code for invalid input.
   * @type {string}
   */
  public static ErrorCode_InvalidInput = 'INVALID_INPUT'
  /**
   * Represents an error code for an API error.
   * @type {string}
   */
  public static ErrorCode_APIError = 'API_ERROR'
  /**
   * Represents the error code for when there are no records found.
   * @type {string}
   */
  public static ErrorCode_NoRecords = 'EMPTY_EVENT'

  /**
   * Retrieves the default port number for HTTP listeners.
   * The port number is obtained from the environment variable "PORT" and parsed as an integer.
   * If the environment variable is not set or cannot be parsed as an integer, the default port number 9000 is used.
   * @returns {number} - The default port number for HTTP listeners.
   */
  public static Listener_HTTP_DefaultPort = Utils.parseIntNullIfNaN(process.env.PORT) || 9000
  /**
   * The default host for the HTTP listener.
   */
  public static Listener_HTTP_DefaultHost = 'localhost'
  /**
   * The HTTP proxy route listener for all routes.
   * @type {string}
   */
  public static Listener_HTTP_ProxyRoute = '*'
  /**
   * Retrieves the default timeout value for HTTP listeners.
   * @returns {number} The default timeout value in milliseconds.
   */
  public static Listener_HTTP_DefaultTimeout = Utils.parseIntNullIfNaN(process.env.TIMEOUT) || 30000
  /**
   * The default health check route for the HTTP listener.
   * @type {string}
   */
  public static Listener_HTTP_DefaultHealthCheckRoute = process.env.HEALTH_ROUTE || '/health'

  /**
   * The response message for an exception that occurred during request execution in the Proxy.
   */
  public static Resp_MSG_EXCEPTION = '[Proxy]: Exception during request execution!'
  /**
   * The response code for an exception that occurred during execution.
   */
  public static Resp_CODE_EXCEPTION = 'EXEC_EXCEPTION'
  /**
   * The HTTP response status code for an exception scenario.
   */
  public static Resp_STATUSCODE_EXCEPTION = 502

  /**
   * The error message for an invalid response from the server.
   */
  public static Resp_MSG_INVALIDRESP = '[Proxy]: Invalid response from server!'
  /**
   * Represents the response code for an invalid response.
   */
  public static Resp_CODE_INVALIDRESP = 'EMPTY_RESPONSE'
  /**
   * The HTTP response status code for an invalid response.
   * @type {number}
   * @default 400
   */
  public static Resp_STATUSCODE_INVALIDRESP = 400
}