xianyan/lib/features/article/providers/article_provider.dart

// ============================================================
// 闲言APP — 文章创作状态管理
// 创建时间: 2026-04-29
// 更新时间: 2026-04-29
// 作用: 文章列表/详情/创作/我的文章状态管理
// 上次更新: 初始创建
// ============================================================

import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../core/utils/logger.dart';
import '../models/article_models.dart';
import '../services/article_service.dart';

class ArticleState {
  const ArticleState({
    this.isLoading = false,
    this.isSubmitting = false,
    this.error,
    this.articles = const [],
    this.myArticles = const [],
    this.currentArticle,
    this.comments = const [],
    this.page = 1,
    this.hasMore = true,
    this.myPage = 1,
    this.myHasMore = true,
    this.selectedCategory,
    this.searchKeyword = '',
  });

  final bool isLoading;
  final bool isSubmitting;
  final String? error;
  final List<Article> articles;
  final List<Article> myArticles;
  final Article? currentArticle;
  final List<ArticleComment> comments;
  final int page;
  final bool hasMore;
  final int myPage;
  final bool myHasMore;
  final String? selectedCategory;
  final String searchKeyword;

  ArticleState copyWith({
    bool? isLoading,
    bool? isSubmitting,
    String? error,
    bool clearError = false,
    List<Article>? articles,
    List<Article>? myArticles,
    Article? currentArticle,
    bool clearCurrentArticle = false,
    List<ArticleComment>? comments,
    int? page,
    bool? hasMore,
    int? myPage,
    bool? myHasMore,
    String? selectedCategory,
    bool clearSelectedCategory = false,
    String? searchKeyword,
    bool clearSearch = false,
  }) {
    return ArticleState(
      isLoading: isLoading ?? this.isLoading,
      isSubmitting: isSubmitting ?? this.isSubmitting,
      error: clearError ? null : (error ?? this.error),
      articles: articles ?? this.articles,
      myArticles: myArticles ?? this.myArticles,
      currentArticle: clearCurrentArticle
          ? null
          : (currentArticle ?? this.currentArticle),
      comments: comments ?? this.comments,
      page: page ?? this.page,
      hasMore: hasMore ?? this.hasMore,
      myPage: myPage ?? this.myPage,
      myHasMore: myHasMore ?? this.myHasMore,
      selectedCategory: clearSelectedCategory
          ? null
          : (selectedCategory ?? this.selectedCategory),
      searchKeyword: clearSearch ? '' : (searchKeyword ?? this.searchKeyword),
    );
  }
}

class ArticleNotifier extends Notifier<ArticleState> {
  @override
  ArticleState build() => const ArticleState();
  ArticleNotifier();

  /// 加载文章列表
  Future<void> loadArticles({
    bool refresh = false,
    String? category,
    String? keyword,
  }) async {
    if (state.isLoading && !refresh) return;
    final page = refresh ? 1 : state.page;
    state = state.copyWith(
      isLoading: true,
      clearError: true,
      page: page,
      selectedCategory: category ?? state.selectedCategory,
      searchKeyword: keyword ?? state.searchKeyword,
    );

    try {
      final articles = await ArticleService.getArticleList(
        page: page,
        category: category ?? state.selectedCategory,
        keyword: keyword ?? state.searchKeyword,
      );
      state = state.copyWith(
        articles: refresh ? articles : [...state.articles, ...articles],
        isLoading: false,
        page: page + 1,
        hasMore: articles.length >= 20,
      );
    } catch (e) {
      Log.e('加载文章列表失败', e);
      state = state.copyWith(isLoading: false, error: '加载失败');
    }
  }

  /// 加载文章详情
  Future<void> loadArticleDetail({required int id}) async {
    state = state.copyWith(isLoading: true, clearError: true);
    try {
      final article = await ArticleService.getArticleDetail(id: id);
      final comments =
          await ArticleService.getArticleComments(articleId: id);
      state = state.copyWith(
        currentArticle: article,
        comments: comments,
        isLoading: false,
      );
    } catch (e) {
      Log.e('加载文章详情失败', e);
      state = state.copyWith(isLoading: false, error: '加载失败');
    }
  }

  /// 提交文章
  Future<bool> submitArticle({
    int? id,
    required String title,
    required String content,
    String? summary,
    String? category,
    List<String>? tags,
  }) async {
    state = state.copyWith(isSubmitting: true);
    try {
      await ArticleService.submitArticle(
        id: id,
        title: title,
        content: content,
        summary: summary,
        category: category,
        tags: tags,
      );
      state = state.copyWith(isSubmitting: false);
      return true;
    } catch (e) {
      Log.e('提交文章失败', e);
      state = state.copyWith(isSubmitting: false);
      return false;
    }
  }

  /// 加载我的文章
  Future<void> loadMyArticles({bool refresh = false}) async {
    if (state.isLoading && !refresh) return;
    final page = refresh ? 1 : state.myPage;
    state = state.copyWith(isLoading: true, clearError: true, myPage: page);

    try {
      final articles = await ArticleService.getMyArticles(page: page);
      state = state.copyWith(
        myArticles:
            refresh ? articles : [...state.myArticles, ...articles],
        isLoading: false,
        myPage: page + 1,
        myHasMore: articles.length >= 20,
      );
    } catch (e) {
      Log.e('加载我的文章失败', e);
      state = state.copyWith(isLoading: false, error: '加载失败');
    }
  }

  /// 删除文章
  Future<bool> deleteArticle({required int id}) async {
    try {
      return await ArticleService.deleteArticle(id: id);
    } catch (e) {
      Log.e('删除文章失败', e);
      return false;
    }
  }
}

final articleProvider =
    NotifierProvider<ArticleNotifier, ArticleState>(ArticleNotifier.new);