demo/xinhuaribao/lib/provider/topic_list_provider.dart

import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:news_app/constant/api_const.dart';
import 'package:news_app/http/http_util.dart';
import 'package:news_app/model/topic_item_model.dart';

import '../http/model_parser.dart';

/// @author: bo.zeng
/// @email: cnhbwds@gmail.com
/// @date: 2025 2025/4/18 10:43
/// @description:
class TopicListProvider extends Notifier<TopicItemModel> {
  @override
  TopicItemModel build() {
    return TopicItemModel();
  }

  Future<void> fetchList({required int page,required String tid}) async {
    var jsonData = await HttpUtil().get(
      apiTopicList,
      queryParameters: tid.isEmpty ? {"pn": page, "ps": 10} : {"tid":tid ,"pn": page, "ps": 10},
    );
    final response = ModelParser.parseObject<TopicItemModel>(
      jsonData,
      TopicItemModel.fromJson,
    );
    final oldRecords = state.records ?? [];
    state = state.copyWith(
      total: response.total,
      size: response.size,
      current: response.current,
      pages: response.pages,
      records:
          page == 1 ? response.records : [...oldRecords, ...?response.records],
    );
  }

  Future<void> fetchTopicLike({
    required String? contentId,
    required bool current,
  }) async {
    if (contentId == null || contentId.isEmpty) {
      return;
    }
    final jsonData = await HttpUtil().get(
      current ? apiTopicCancelLike : apiTopicLike,
      queryParameters: {"contentId": contentId},
    );
    if (jsonData == true) {
      //修改成功后，把state列表中的item likeCount+1
      if (current) {
        state = state.copyWith(
          records:
              state.records?.map((topic) {
                if (topic.contentId == contentId) {
                  return topic.copyWith(
                    likeNum: (topic.likeNum ?? 1) - 1,
                    isLiked: false,
                  );
                }
                return topic;
              }).toList(),
        );
      } else {
        state = state.copyWith(
          records:
              state.records?.map((topic) {
                if (topic.contentId == contentId) {
                  return topic.copyWith(
                    likeNum: (topic.likeNum ?? 0) + 1,
                    isLiked: true,
                  );
                }
                return topic;
              }).toList(),
        );
      }
    }
  }

  Future<void> fetchTopicFavorite({
    required String? contentId,
    required bool current,
  }) async {
    if (contentId == null || contentId.isEmpty) {
      return;
    }
    final jsonData = await HttpUtil().get(
      current ? apiTopicCancelFavorite : apiTopicFavorite,
      queryParameters: {"contentId": contentId},
    );
    if (jsonData == true) {
      //修改成功后，把state列表中的item likeCount+1
      if (current) {
        state = state.copyWith(
          records:
              state.records?.map((topic) {
                if (topic.contentId == contentId) {
                  return topic.copyWith(
                    favoriteCount: (topic.favoriteCount ?? 1) - 1,
                    isFavorite: false,
                  );
                }
                return topic;
              }).toList(),
        );
      } else {
        state = state.copyWith(
          records:
              state.records?.map((topic) {
                if (topic.contentId == contentId) {
                  return topic.copyWith(
                    favoriteCount: (topic.favoriteCount ?? 0) + 1,
                    isFavorite: true,
                  );
                }
                return topic;
              }).toList(),
        );
      }
    }
  }
}