using System.Diagnostics;

namespace AiQ_GUI
{
    internal class Logging
    {
        public const string LogFileName = "AiQ_GUI_Log.log"; // Log file name
        public const int maxFileSizeMB = 6 * 1024 * 1024; // 6mb max storage
        public const int keepLines = 60000;

        // Logs error message to the log file
        public static async Task LogErrorMessage(string message, string? FileName = LogFileName)
        {
            await LogMessage("[ERROR] " + message, FileName);
        }

        // Logs warning message to the log file
        public static async Task LogWarningMessage(string message, string? FileName = LogFileName)
        {
            await LogMessage("[WARNING] " + message, FileName);
        }

        // Method to log messages, defaults to main log file
        public static async Task LogMessage(string message, string? FileName = LogFileName)
        {
            try
            {
                string logFilePath = LDS.MAVPath + FileName;
                FileInfo fi = new(logFilePath);

                if (fi.Exists && fi.Length > maxFileSizeMB) // Check file size is under 2mb
                {
                    List<string> allLines = (await File.ReadAllLinesAsync(logFilePath)).TakeLast(keepLines).ToList();
                    await File.WriteAllLinesAsync(logFilePath, allLines);
                }

                // If the message ends with a newline character, remove it
                string trimmedMessage = message.EndsWith("\r\n") ? message[..^2] : (message.EndsWith('\n') ? message[..^1] : message);

                // Append the new message to log
                using StreamWriter writer = new(logFilePath, append: true);
                await writer.WriteLineAsync($"{DateTime.Now}:  {trimmedMessage}");
            }
            catch (Exception ex)
            {
                Debug.WriteLine($"Error logging message: {ex.Message}");
            }
        }
    }
}