frontend/src/services/postService.ts

/**
 * 帖子服务
 * 处理帖子的增删改查、点赞、收藏等功能
 */

import { api, PaginatedData } from './api';
import { Post, CreatePostInput } from '../types';
import { CursorPaginationRequest, CursorPaginationResponse } from '../types/dto';

// 帖子列表响应
interface PostListResponse {
  list: Post[];
  total: number;
  page: number;
  page_size: number;
  total_pages: number;
}

// 帖子响应 - API直接返回Post对象
type PostResponse = Post;

// 创建帖子请求
interface CreatePostRequest {
  title: string;
  content: string;
  images?: string[];
}

// 更新帖子请求
interface UpdatePostRequest {
  title?: string;
  content?: string;
  images?: string[];
}

// 帖子服务类
class PostService {
  // 获取帖子列表
  async getPosts(
    page = 1,
    pageSize = 20,
    tab?: string,
    communityId?: string
  ): Promise<PaginatedData<Post>> {
    const params: Record<string, any> = {
      page,
      page_size: pageSize,
    };
    
    if (tab) {
      params.tab = tab;
    }
    if (communityId) {
      params.community_id = communityId;
    }
    
    const response = await api.get<PostListResponse>('/posts', params);
    return response.data;
  }

  // 获取推荐帖子
  async getRecommendedPosts(page = 1, pageSize = 20): Promise<PaginatedData<Post>> {
    return this.getPosts(page, pageSize, 'recommend');
  }

  // 获取关注帖子
  async getFollowingPosts(page = 1, pageSize = 20): Promise<PaginatedData<Post>> {
    return this.getPosts(page, pageSize, 'follow');
  }

  // 获取热门帖子
  async getHotPosts(page = 1, pageSize = 20): Promise<PaginatedData<Post>> {
    return this.getPosts(page, pageSize, 'hot');
  }

  // 获取最新帖子
  async getLatestPosts(page = 1, pageSize = 20): Promise<PaginatedData<Post>> {
    return this.getPosts(page, pageSize, 'latest');
  }

  // 获取帖子详情（不增加浏览量）
  async getPost(postId: string): Promise<Post | null> {
    try {
      const response = await api.get<PostResponse>(`/posts/${postId}`);
      return response.data;
    } catch (error) {
      console.error('获取帖子详情失败:', error);
      return null;
    }
  }

  // 记录帖子浏览（增加浏览量）
  async recordView(postId: string): Promise<boolean> {
    try {
      const response = await api.post(`/posts/${postId}/view`);
      return response.code === 0;
    } catch (error) {
      console.error('记录浏览失败:', error);
      return false;
    }
  }

  // 创建帖子
  async createPost(data: CreatePostRequest): Promise<Post | null> {
    const response = await api.post<PostResponse>('/posts', data);
    return response.data;
  }

  // 更新帖子
  async updatePost(postId: string, data: UpdatePostRequest): Promise<Post | null> {
    try {
      const response = await api.put<PostResponse>(`/posts/${postId}`, data);
      return response.data;
    } catch (error) {
      console.error('更新帖子失败:', error);
      return null;
    }
  }

  // 删除帖子
  async deletePost(postId: string): Promise<boolean> {
    try {
      const response = await api.delete(`/posts/${postId}`);
      return response.code === 0;
    } catch (error) {
      console.error('删除帖子失败:', error);
      return false;
    }
  }

  // 点赞帖子
  async likePost(postId: string): Promise<Post | null> {
    try {
      const response = await api.post<Post>(`/posts/${postId}/like`);
      if (response.code === 0) {
        return response.data;
      }
      console.warn('[postService] likePost failed, code:', response.code);
      return null;
    } catch (error) {
      console.error('[postService] likePost error:', error);
      return null;
    }
  }

  // 取消点赞帖子
  async unlikePost(postId: string): Promise<Post | null> {
    try {
      const response = await api.delete<Post>(`/posts/${postId}/like`);
      if (response.code === 0) {
        return response.data;
      }
      console.warn('[postService] unlikePost failed, code:', response.code);
      return null;
    } catch (error) {
      console.error('[postService] unlikePost error:', error);
      return null;
    }
  }

  // 收藏帖子
  async favoritePost(postId: string): Promise<Post | null> {
    try {
      const response = await api.post<Post>(`/posts/${postId}/favorite`);
      if (response.code === 0) {
        return response.data;
      }
      console.warn('[postService] favoritePost failed, code:', response.code);
      return null;
    } catch (error) {
      console.error('[postService] favoritePost error:', error);
      return null;
    }
  }

  // 取消收藏帖子
  async unfavoritePost(postId: string): Promise<Post | null> {
    try {
      const response = await api.delete<Post>(`/posts/${postId}/favorite`);
      if (response.code === 0) {
        return response.data;
      }
      console.warn('[postService] unfavoritePost failed, code:', response.code);
      return null;
    } catch (error) {
      console.error('[postService] unfavoritePost error:', error);
      return null;
    }
  }

  // 获取用户帖子列表
  async getUserPosts(
    userId: string,
    page = 1,
    pageSize = 20
  ): Promise<PaginatedData<Post>> {
    try {
      const response = await api.get<PostListResponse>(`/users/${userId}/posts`, {
        page,
        page_size: pageSize,
      });
      return response.data;
    } catch (error) {
      console.error('获取用户帖子列表失败:', error);
      return {
        list: [],
        total: 0,
        page: 1,
        page_size: pageSize,
        total_pages: 0,
      };
    }
  }

  // 获取用户收藏列表
  async getUserFavorites(
    userId: string,
    page = 1,
    pageSize = 20
  ): Promise<PaginatedData<Post>> {
    try {
      const response = await api.get<PostListResponse>(`/users/${userId}/favorites`, {
        page,
        page_size: pageSize,
      });
      return response.data;
    } catch (error) {
      console.error('获取用户收藏列表失败:', error);
      return {
        list: [],
        total: 0,
        page: 1,
        page_size: pageSize,
        total_pages: 0,
      };
    }
  }

  // 搜索帖子
  async searchPosts(
    keyword: string,
    page = 1,
    pageSize = 20
  ): Promise<PaginatedData<Post>> {
    try {
      const response = await api.get<PostListResponse>('/posts/search', {
        keyword,
        page,
        page_size: pageSize,
      });
      return response.data;
    } catch (error) {
      console.error('搜索帖子失败:', error);
      return {
        list: [],
        total: 0,
        page: 1,
        page_size: pageSize,
        total_pages: 0,
      };
    }
  }

  // 分享帖子
  async sharePost(postId: string): Promise<boolean> {
    try {
      const response = await api.post(`/posts/${postId}/share`);
      return response.code === 0;
    } catch (error) {
      console.error('分享帖子失败:', error);
      return false;
    }
  }

  // 举报帖子
  async reportPost(postId: string, reason: string): Promise<boolean> {
    try {
      const response = await api.post(`/posts/${postId}/report`, { reason });
      return response.code === 0;
    } catch (error) {
      console.error('举报帖子失败:', error);
      return false;
    }
  }

  // ==================== 游标分页方法 ====================

  /**
   * 获取帖子列表（游标分页）
   * GET /api/v1/posts/cursor
   * @param params 游标分页请求参数（包含 post_type 可选：recommend, follow, hot, latest）
   */
  async getPostsCursor(
    params: CursorPaginationRequest = {}
  ): Promise<CursorPaginationResponse<Post>> {
    try {
      const response = await api.get<CursorPaginationResponse<Post>>('/posts/cursor', {
        params: {
          cursor: params.cursor,
          page_size: params.page_size,
          post_type: params.post_type,
        },
      });
      return response.data;
    } catch (error) {
      console.error('获取帖子列表失败:', error);
      return {
        items: [],
        next_cursor: null,
        prev_cursor: null,
        has_more: false,
      };
    }
  }

  /**
   * 搜索帖子（游标分页）
   * GET /api/v1/posts/search/cursor
   * @param query 搜索关键词
   * @param params 游标分页请求参数
   */
  async searchPostsCursor(
    query: string,
    params: CursorPaginationRequest = {}
  ): Promise<CursorPaginationResponse<Post>> {
    try {
      const response = await api.get<CursorPaginationResponse<Post>>('/posts/search/cursor', {
        params: {
          ...params,
          keyword: query,
        },
      });
      return response.data;
    } catch (error) {
      console.error('搜索帖子失败:', error);
      return {
        items: [],
        next_cursor: null,
        prev_cursor: null,
        has_more: false,
      };
    }
  }

  /**
   * 获取用户帖子列表（游标分页）
   * GET /api/v1/users/:id/posts/cursor
   * @param userId 用户ID
   * @param params 游标分页请求参数
   */
  async getUserPostsCursor(
    userId: string,
    params: CursorPaginationRequest = {}
  ): Promise<CursorPaginationResponse<Post>> {
    try {
      const response = await api.get<CursorPaginationResponse<Post>>(
        `/users/${userId}/posts/cursor`,
        { params }
      );
      return response.data;
    } catch (error) {
      console.error('获取用户帖子列表失败:', error);
      return {
        items: [],
        next_cursor: null,
        prev_cursor: null,
        has_more: false,
      };
    }
  }
}

// 导出帖子服务实例
export const postService = new PostService();