using System;
using System.Collections.ObjectModel;
using System.Windows;

namespace S7Explorer.Services
{
    public class LogService
    {
        private static LogService? _instance;
        private ObservableCollection<LogEntry> _logs = new();

        // Singleton instance
        public static LogService Instance
        {
            get
            {
                if (_instance == null)
                    _instance = new LogService();
                return _instance;
            }
        }

        public ObservableCollection<LogEntry> Logs => _logs;

        public void LogInfo(string message)
        {
            AddLog(LogLevel.Info, message);
        }

        public void LogWarning(string message)
        {
            AddLog(LogLevel.Warning, message);
        }

        public void LogError(string message)
        {
            AddLog(LogLevel.Error, message);
        }

        public void LogError(Exception ex)
        {
            AddLog(LogLevel.Error, $"Error: {ex.Message}");
            AddLog(LogLevel.Debug, $"Stack trace: {ex.StackTrace}");
        }

        public void LogDebug(string message)
        {
            AddLog(LogLevel.Debug, message);
        }

        private void AddLog(LogLevel level, string message)
        {
            Application.Current.Dispatcher.Invoke(() =>
            {
                _logs.Add(new LogEntry
                {
                    Timestamp = DateTime.Now,
                    Level = level,
                    Message = message
                });
            });
        }
    }
}