import 'package:flutter/foundation.dart';

enum LogLevel { debug, info, warning, error }

class LogEntry {
  final DateTime timestamp;
  final LogLevel level;
  final String message;
  final String? source;

  LogEntry({required this.level, required this.message, this.source}) : timestamp = DateTime.now();

  @override
  String toString() {
    final levelStr = level.toString().split('.').last.toUpperCase();
    final timeStr = timestamp.toIso8601String();
    final sourceStr = source != null ? ' [$source]' : '';
    return '$timeStr $levelStr$sourceStr: $message';
  }
}

class Logger with ChangeNotifier {
  static final Logger _instance = Logger._internal();
  final List<LogEntry> _logs = [];
  bool _showTimestamps = true;
  bool _showSource = true;
  LogLevel _minimumLevel = LogLevel.debug;

  factory Logger() {
    return _instance;
  }

  Logger._internal();

  List<LogEntry> get logs => List.unmodifiable(_logs);
  bool get showTimestamps => _showTimestamps;
  bool get showSource => _showSource;
  LogLevel get minimumLevel => _minimumLevel;

  void setMinimumLevel(LogLevel level) {
    _minimumLevel = level;
    notifyListeners();
  }

  void setShowTimestamps(bool show) {
    _showTimestamps = show;
    notifyListeners();
  }

  void setShowSource(bool show) {
    _showSource = show;
    notifyListeners();
  }

  void _addLog(LogEntry entry) {
    if (entry.level.index >= _minimumLevel.index) {
      _logs.add(entry);
      notifyListeners();
      if (kDebugMode) {
        print(entry.toString());
      }
    }
  }

  void debug(String message, {String? source}) {
    _addLog(LogEntry(level: LogLevel.debug, message: message, source: source));
  }

  void info(String message, {String? source}) {
    _addLog(LogEntry(level: LogLevel.info, message: message, source: source));
  }

  void warning(String message, {String? source}) {
    _addLog(LogEntry(level: LogLevel.warning, message: message, source: source));
  }

  void error(String message, {String? source}) {
    _addLog(LogEntry(level: LogLevel.error, message: message, source: source));
  }

  void clear() {
    _logs.clear();
    notifyListeners();
  }
}