using System;
using System.Globalization;

namespace MTWorkHR.Core.Global
{
    public class AppException : Exception
    {
        /// <summary>
        /// Gets the error number associated with this exception.
        /// </summary>
        public readonly ExceptionEnum ErrorNumber;

        /// <summary>
        /// Gets the formatted error message.
        /// </summary>
        public string ErrorMessage { get; private set; } = string.Empty;
        public AppException(string errorMessage) : base(errorMessage)
        {
            ErrorMessage = errorMessage;
        }
        /// <summary>
        /// Creates a new instance of <see cref="AppException"/> using an error number, language, and optional format arguments.
        /// </summary>
        /// <param name="errorNumber">The error number (enum) representing the exception type.</param>
        /// <param name="language">The language code (e.g., "en" or "ar").</param>
        /// <param name="args">Optional arguments to format the error message.</param>
        public AppException(ExceptionEnum errorNumber, params object[] args) : base()
        {
            ErrorNumber = errorNumber;
            ErrorMessage = GetMessage(errorNumber, GlobalInfo.lang?? "en", args);

            // Initialize the base exception with the localized error message.
            this.SetErrorMessage();
        }

        /// <summary>
        /// Sets the exception message for the base exception class.
        /// </summary>
        private void SetErrorMessage()
        {
            base.HelpLink = ErrorNumber.ToString(); // Optional: Use error number as a link or reference
            base.Source = nameof(AppException);    // Optional: Set the exception source
        }

        /// <summary>
        /// Retrieves the error message based on the provided error code and language.
        /// </summary>
        /// <param name="code">The error number (enum).</param>
        /// <param name="language">The language code (default: "en").</param>
        /// <param name="args">Optional parameters for formatting the message.</param>
        /// <returns>The localized error message.</returns>
        public static string GetMessage(ExceptionEnum code, string language = "en", params object[] args)
        {
            if (AppExceptions.ExceptionMessages.TryGetValue(code, out var translations)
                && translations.TryGetValue(language, out var message))
            {
                try
                {
                    return string.Format(CultureInfo.InvariantCulture, message, args);
                }
                catch (FormatException)
                {
                    return language == "ar" ? "فشل في تنسيق الرسالة." : "Message formatting failed.";
                }
            }

            // Default fallback
            return language == "ar" ? "رسالة الخطأ غير موجودة." : "Error message not found.";
        }

        public override string ToString()
        {
            return $"{base.ToString()}\nError Number: {ErrorNumber}\nError Message: {ErrorMessage}";
        }
    }


}