import 'package:social_app/core/api/i_api_client.dart';

class TodoApi {
  final IApiClient _client;
  static const _prefix = '/api/v1/todos';

  TodoApi(this._client);

  Future<List<TodoResponse>> getTodos({String? status, int? priority}) async {
    final queryParts = <String>[];
    if (status != null) queryParts.add('status=$status');
    if (priority != null) queryParts.add('priority=$priority');
    final query = queryParts.isEmpty ? '' : '?${queryParts.join('&')}';

    final response = await _client.get('$_prefix$query');
    final List<dynamic> data = response.data;
    return data.map((json) => TodoResponse.fromJson(json)).toList();
  }

  Future<TodoResponse> getTodo(String id) async {
    final response = await _client.get('$_prefix/$id');
    return TodoResponse.fromJson(response.data);
  }

  Future<TodoResponse> createTodo({
    required String title,
    String? description,
    DateTime? dueAt,
    int priority = 1,
    List<String> scheduleItemIds = const [],
  }) async {
    final data = <String, dynamic>{'title': title, 'priority': priority};
    if (description != null) data['description'] = description;
    if (dueAt != null) data['due_at'] = dueAt.toIso8601String();
    if (scheduleItemIds.isNotEmpty) data['schedule_item_ids'] = scheduleItemIds;

    final response = await _client.post(_prefix, data: data);
    return TodoResponse.fromJson(response.data);
  }

  Future<TodoResponse> updateTodo(
    String id, {
    String? title,
    String? description,
    DateTime? dueAt,
    int? priority,
    String? status,
    List<String>? scheduleItemIds,
  }) async {
    final data = <String, dynamic>{};
    if (title != null) data['title'] = title;
    if (description != null) data['description'] = description;
    if (dueAt != null) data['due_at'] = dueAt.toIso8601String();
    if (priority != null) data['priority'] = priority;
    if (status != null) data['status'] = status;
    if (scheduleItemIds != null) data['schedule_item_ids'] = scheduleItemIds;

    final response = await _client.patch('$_prefix/$id', data: data);
    return TodoResponse.fromJson(response.data);
  }

  Future<TodoResponse> completeTodo(String id) async {
    final response = await _client.post('$_prefix/$id/complete', data: {});
    return TodoResponse.fromJson(response.data);
  }

  Future<void> deleteTodo(String id) async {
    await _client.delete('$_prefix/$id');
  }
}

class ScheduleItemBasic {
  final String id;
  final String title;
  final DateTime startAt;
  final DateTime? endAt;

  ScheduleItemBasic({
    required this.id,
    required this.title,
    required this.startAt,
    this.endAt,
  });

  factory ScheduleItemBasic.fromJson(Map<String, dynamic> json) {
    return ScheduleItemBasic(
      id: json['id'] as String,
      title: json['title'] as String,
      startAt: DateTime.parse(json['start_at'] as String),
      endAt: json['end_at'] != null
          ? DateTime.parse(json['end_at'] as String)
          : null,
    );
  }
}

class TodoResponse {
  final String id;
  final String ownerId;
  final String title;
  final String? description;
  final DateTime? dueAt;
  final int priority;
  final String status;
  final DateTime? completedAt;
  final DateTime createdAt;
  final DateTime updatedAt;
  final List<ScheduleItemBasic> scheduleItems;

  TodoResponse({
    required this.id,
    required this.ownerId,
    required this.title,
    this.description,
    this.dueAt,
    required this.priority,
    required this.status,
    this.completedAt,
    required this.createdAt,
    required this.updatedAt,
    this.scheduleItems = const [],
  });

  factory TodoResponse.fromJson(Map<String, dynamic> json) {
    final scheduleItemsList = json['schedule_items'] as List<dynamic>? ?? [];
    return TodoResponse(
      id: json['id'] as String,
      ownerId: json['owner_id'] as String,
      title: json['title'] as String,
      description: json['description'] as String?,
      dueAt: json['due_at'] != null
          ? DateTime.parse(json['due_at'] as String)
          : null,
      priority: json['priority'] as int,
      status: json['status'] as String,
      completedAt: json['completed_at'] != null
          ? DateTime.parse(json['completed_at'] as String)
          : null,
      createdAt: DateTime.parse(json['created_at'] as String),
      updatedAt: DateTime.parse(json['updated_at'] as String),
      scheduleItems: scheduleItemsList
          .map((e) => ScheduleItemBasic.fromJson(e as Map<String, dynamic>))
          .toList(),
    );
  }

  TodoResponse copyWith({
    String? id,
    String? ownerId,
    String? title,
    String? description,
    DateTime? dueAt,
    int? priority,
    String? status,
    DateTime? completedAt,
    DateTime? createdAt,
    DateTime? updatedAt,
    List<ScheduleItemBasic>? scheduleItems,
  }) {
    return TodoResponse(
      id: id ?? this.id,
      ownerId: ownerId ?? this.ownerId,
      title: title ?? this.title,
      description: description ?? this.description,
      dueAt: dueAt ?? this.dueAt,
      priority: priority ?? this.priority,
      status: status ?? this.status,
      completedAt: completedAt ?? this.completedAt,
      createdAt: createdAt ?? this.createdAt,
      updatedAt: updatedAt ?? this.updatedAt,
      scheduleItems: scheduleItems ?? this.scheduleItems,
    );
  }
}