import 'dart:convert';
import 'package:be_happy/domain/entities/point.dart';

class Zone {
  final int id;
  final String title;
  final String description;
  final String type;
  final bool isActive;
  final String shapeType;
  // Трехмерная структура для поддержки MultiPolygon и дыр (holes):
  // geometry[индекс_полигона][индекс_кольца][индекс_точки]
  // индекс_кольца == 0 — внешняя граница, > 0 — внутренние вырезы (дыры)
  final List<List<List<Point>>> geometry;
  final String speedLimit;

  Zone({
    required this.id,
    required this.title,
    required this.description,
    required this.type,
    required this.isActive,
    required this.shapeType,
    required this.geometry,
    required this.speedLimit,
  });

  // Геттер для обратной совместимости (возвращает внешнее кольцо первого полигона)
  List<Point> get points {
    if (geometry.isNotEmpty && geometry[0].isNotEmpty) {
      return geometry[0][0];
    }
    return [];
  }

  factory Zone.fromJson(Map<String, dynamic> json) {
    final zoneCoordinates = json['coordinates'] as Map<String, dynamic>? ?? {};
    final String coordsString = zoneCoordinates['coordinates'] ?? '[]';
    final String shapeType = zoneCoordinates['type'] ?? 'Polygon';

    List<List<List<Point>>> parsedGeometry = [];

    try {
      final dynamic decoded = jsonDecode(coordsString);

      if (decoded is List && decoded.isNotEmpty) {
        if (shapeType == 'Polygon') {
          // Структура: [[[lon, lat], [lon, lat], ...], [hole1], ...]
          List<List<Point>> polygonRings = [];
          for (var ring in decoded) {
            if (ring is List) {
              List<Point> ringPoints = [];
              for (var coord in ring) {
                if (coord is List && coord.length >= 2) {
                  // В GeoJSON сначала идет Longitude, затем Latitude
                  ringPoints.add(Point(
                    (coord[1] as num).toDouble(),
                    (coord[0] as num).toDouble(),
                  ));
                }
              }
              if (ringPoints.isNotEmpty) polygonRings.add(ringPoints);
            }
          }
          if (polygonRings.isNotEmpty) parsedGeometry.add(polygonRings);

        } else if (shapeType == 'MultiPolygon') {
          // Структура: [[[[lon, lat], ...]], [[[lon, lat], ...]]]
          for (var poly in decoded) {
            if (poly is List) {
              List<List<Point>> polygonRings = [];
              for (var ring in poly) {
                if (ring is List) {
                  List<Point> ringPoints = [];
                  for (var coord in ring) {
                    if (coord is List && coord.length >= 2) {
                      ringPoints.add(Point(
                        (coord[1] as num).toDouble(),
                        (coord[0] as num).toDouble(),
                      ));
                    }
                  }
                  if (ringPoints.isNotEmpty) polygonRings.add(ringPoints);
                }
              }
              if (polygonRings.isNotEmpty) parsedGeometry.add(polygonRings);
            }
          }
        } else {
          // Fallback для LineString или плоских списков
          List<Point> ringPoints = [];
          for (var coord in decoded) {
            if (coord is List && coord.length >= 2) {
              ringPoints.add(Point(
                (coord[1] as num).toDouble(),
                (coord[0] as num).toDouble(),
              ));
            }
          }
          if (ringPoints.isNotEmpty) parsedGeometry.add([ringPoints]);
        }
      }
    } catch (e) {
      print("PARSE ERROR for Zone ID ${json['id']}: $e");
    }

    return Zone(
      id: json['id'] ?? 0,
      title: json['title'] ?? 'Unknown',
      description: json['description'] ?? '',
      type: json['type'] ?? '',
      isActive: json['isActive'] ?? false,
      speedLimit: json['speedLimit'] ?? '',
      shapeType: shapeType,
      geometry: parsedGeometry,
    );
  }

  @override
  String toString() {
    return 'Zone{id: $id, title: $title, type: $type, polygonsCount: ${geometry.length}}';
  }
}