import 'package:dio/dio.dart';

import '../models/media_asset.dart';
import 'api_client.dart';

/// 媒体资源管理服务：媒体资产与排行榜。
///
/// 对接真实「爱视后台」：
/// - 媒体资产：/api/sys/mediaAsset/*
/// - 媒体排行榜：/api/sys/mediaAssetRank/*
class MediaService {
  MediaService({Dio? dio}) : _dio = dio ?? ApiClient.instance.dio;

  final Dio _dio;

  // ================ 媒体资产管理 ================

  /// 获取媒体资产列表（分页）。
  ///
  /// GET /sys/mediaAsset/list?page=&limit=
  Future<List<MediaAsset>> getMediaAssetList({
    int page = 1,
    int limit = 20,
  }) async {
    final response = await _dio.get<dynamic>(
      '/sys/mediaAsset/list',
      queryParameters: {'page': page, 'limit': limit},
    );
    final list = _extractList(response.data);
    return list
        .whereType<Map<String, dynamic>>()
        .map(MediaAsset.fromJson)
        .toList();
  }

  /// 获取媒体资产详情。
  ///
  /// GET /sys/mediaAsset/info/{id}
  Future<MediaAsset> getMediaAssetInfo(String id) async {
    final response = await _dio.get<dynamic>('/sys/mediaAsset/info/$id');
    final data = response.data;
    if (data is! Map<String, dynamic>) {
      throw ApiException(500, '媒体资产信息加载失败：$id');
    }
    return MediaAsset.fromJson(data);
  }

  /// 新增或修改媒体资产。
  ///
  /// POST /sys/mediaAsset/save，body 为媒体数据。
  Future<void> saveMediaAsset(Map<String, dynamic> data) async {
    await _dio.post<dynamic>('/sys/mediaAsset/save', data: data);
  }

  /// 批量删除媒体资产。
  ///
  /// POST /sys/mediaAsset/delete，body 为 `{ids: [...]}`。
  Future<void> deleteMediaAsset(List<int> ids) async {
    await _dio.post<dynamic>(
      '/sys/mediaAsset/delete',
      data: {'ids': ids},
    );
  }

  // ================ 媒体排行榜 ================

  /// 获取媒体排行榜 Top 10。
  ///
  /// GET /sys/mediaAssetRank/top10
  Future<List<MediaRankItem>> getMediaAssetRankTop10() async {
    final response = await _dio.get<dynamic>('/sys/mediaAssetRank/top10');
    final list = _extractList(response.data);
    return list
        .whereType<Map<String, dynamic>>()
        .map(MediaRankItem.fromJson)
        .toList();
  }

  /// 设置排行榜（批量设置，覆盖原有列表）。
  ///
  /// POST /sys/mediaAssetRank/set，body 为 `{codeList: [...]}`。
  Future<void> setMediaAssetRank(List<String> codeList) async {
    await _dio.post<dynamic>(
      '/sys/mediaAssetRank/set',
      data: {'codeList': codeList},
    );
  }

  /// 从排行榜移除指定媒体。
  ///
  /// POST /sys/mediaAssetRank/remove，body 为 `{code: ...}`。
  Future<void> removeMediaAssetRank(String code) async {
    await _dio.post<dynamic>(
      '/sys/mediaAssetRank/remove',
      data: {'code': code},
    );
  }

  /// 将指定媒体上移一位。
  ///
  /// POST /sys/mediaAssetRank/moveUp，body 为 `{code: ...}`。
  Future<void> moveUpMediaAssetRank(String code) async {
    await _dio.post<dynamic>(
      '/sys/mediaAssetRank/moveUp',
      data: {'code': code},
    );
  }

  /// 将指定媒体下移一位。
  ///
  /// POST /sys/mediaAssetRank/moveDown，body 为 `{code: ...}`。
  Future<void> moveDownMediaAssetRank(String code) async {
    await _dio.post<dynamic>(
      '/sys/mediaAssetRank/moveDown',
      data: {'code': code},
    );
  }

  /// 清空排行榜。
  ///
  /// POST /sys/mediaAssetRank/clear
  Future<void> clearMediaAssetRank() async {
    await _dio.post<dynamic>('/sys/mediaAssetRank/clear');
  }

  // ================ 工具方法 ================

  /// 兼容列表响应的三种形态：
  /// `{list: [...], totalCount}` / `{page: {list, totalCount}}` / 直接数组。
  static List<dynamic> _extractList(dynamic data) {
    if (data is List) {
      return data;
    }
    if (data is Map<String, dynamic>) {
      final list = data['list'];
      if (list is List) {
        return list;
      }
      final page = data['page'];
      if (page is Map<String, dynamic> && page['list'] is List) {
        return page['list'] as List;
      }
    }
    return const <dynamic>[];
  }
}