import 'dart:convert';
import 'dart:typed_data';

/// A specific tile type within a provider
class TileType {
  final String id;
  final String name;
  final String urlTemplate;
  final String attribution;
  final Uint8List? previewTile; // Single tile image data for preview

  const TileType({
    required this.id,
    required this.name,
    required this.urlTemplate,
    required this.attribution,
    this.previewTile,
  });

  /// Create URL for a specific tile, replacing template variables
  String getTileUrl(int z, int x, int y, {String? apiKey}) {
    String url = urlTemplate
        .replaceAll('{z}', z.toString())
        .replaceAll('{x}', x.toString())
        .replaceAll('{y}', y.toString());
    
    if (apiKey != null && apiKey.isNotEmpty) {
      url = url.replaceAll('{api_key}', apiKey);
    }
    
    return url;
  }

  /// Check if this tile type needs an API key
  bool get requiresApiKey => urlTemplate.contains('{api_key}');

  Map<String, dynamic> toJson() => {
    'id': id,
    'name': name,
    'urlTemplate': urlTemplate,
    'attribution': attribution,
    'previewTile': previewTile != null ? base64Encode(previewTile!) : null,
  };

  static TileType fromJson(Map<String, dynamic> json) => TileType(
    id: json['id'],
    name: json['name'],
    urlTemplate: json['urlTemplate'],
    attribution: json['attribution'],
    previewTile: json['previewTile'] != null 
        ? base64Decode(json['previewTile'])
        : null,
  );

  TileType copyWith({
    String? id,
    String? name,
    String? urlTemplate,
    String? attribution,
    Uint8List? previewTile,
  }) => TileType(
    id: id ?? this.id,
    name: name ?? this.name,
    urlTemplate: urlTemplate ?? this.urlTemplate,
    attribution: attribution ?? this.attribution,
    previewTile: previewTile ?? this.previewTile,
  );

  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is TileType && runtimeType == other.runtimeType && id == other.id;

  @override
  int get hashCode => id.hashCode;
}

/// A tile provider containing multiple tile types
class TileProvider {
  final String id;
  final String name;
  final String? apiKey;
  final List<TileType> tileTypes;

  const TileProvider({
    required this.id,
    required this.name,
    this.apiKey,
    required this.tileTypes,
  });

  /// Check if this provider is usable (has API key if any tile types need it)
  bool get isUsable {
    final needsKey = tileTypes.any((type) => type.requiresApiKey);
    return !needsKey || (apiKey != null && apiKey!.isNotEmpty);
  }

  /// Get available tile types (those that don't need API key or have one)
  List<TileType> get availableTileTypes {
    return tileTypes.where((type) => !type.requiresApiKey || isUsable).toList();
  }

  Map<String, dynamic> toJson() => {
    'id': id,
    'name': name,
    'apiKey': apiKey,
    'tileTypes': tileTypes.map((type) => type.toJson()).toList(),
  };

  static TileProvider fromJson(Map<String, dynamic> json) => TileProvider(
    id: json['id'],
    name: json['name'],
    apiKey: json['apiKey'],
    tileTypes: (json['tileTypes'] as List)
        .map((typeJson) => TileType.fromJson(typeJson))
        .toList(),
  );

  TileProvider copyWith({
    String? id,
    String? name,
    String? apiKey,
    List<TileType>? tileTypes,
  }) => TileProvider(
    id: id ?? this.id,
    name: name ?? this.name,
    apiKey: apiKey ?? this.apiKey,
    tileTypes: tileTypes ?? this.tileTypes,
  );

  @override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is TileProvider && runtimeType == other.runtimeType && id == other.id;

  @override
  int get hashCode => id.hashCode;
}

/// Factory for creating default tile providers
class DefaultTileProviders {
  /// Create the default set of tile providers
  static List<TileProvider> createDefaults() {
    return [
      TileProvider(
        id: 'openstreetmap',
        name: 'OpenStreetMap',
        tileTypes: [
          TileType(
            id: 'osm_street',
            name: 'Street Map',
            urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
            attribution: '© OpenStreetMap contributors',
          ),
        ],
      ),
      TileProvider(
        id: 'google',
        name: 'Google',
        tileTypes: [
          TileType(
            id: 'google_hybrid',
            name: 'Satellite + Roads',
            urlTemplate: 'https://mt1.google.com/vt/lyrs=y&x={x}&y={y}&z={z}',
            attribution: '© Google',
          ),
          TileType(
            id: 'google_satellite',
            name: 'Satellite Only',
            urlTemplate: 'https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}',
            attribution: '© Google',
          ),
          TileType(
            id: 'google_roadmap',
            name: 'Road Map',
            urlTemplate: 'https://mt1.google.com/vt/lyrs=m&x={x}&y={y}&z={z}',
            attribution: '© Google',
          ),
        ],
      ),
      TileProvider(
        id: 'esri',
        name: 'Esri',
        tileTypes: [
          TileType(
            id: 'esri_satellite',
            name: 'Satellite Imagery',
            urlTemplate: 'https://services.arcgisonline.com/ArcGis/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}.png',
            attribution: '© Esri © Maxar',
          ),
        ],
      ),
      TileProvider(
        id: 'mapbox',
        name: 'Mapbox',
        tileTypes: [
          TileType(
            id: 'mapbox_satellite',
            name: 'Satellite',
            urlTemplate: 'https://api.mapbox.com/v4/mapbox.satellite/{z}/{x}/{y}@2x.jpg90?access_token={api_key}',
            attribution: '© Mapbox © Maxar',
          ),
          TileType(
            id: 'mapbox_streets',
            name: 'Streets',
            urlTemplate: 'https://api.mapbox.com/styles/v1/mapbox/streets-v12/tiles/{z}/{x}/{y}?access_token={api_key}',
            attribution: '© Mapbox © OpenStreetMap',
          ),
        ],
      ),
    ];
  }
}