slow_wild_backend/internal/logic/getpostlogic.go

package logic

import (
	"context"
	"errors"
	"slowwild/internal/constants"
	"slowwild/internal/errorx"
	"slowwild/internal/svc"
	"strconv"
	"strings"

	"git.banshen.xyz/huangguangrong/slow_wild_protobuff/slowwild/slowwildserver"
	"gorm.io/gorm"

	"github.com/spf13/cast"
	"github.com/zeromicro/go-zero/core/logx"
)

type GetPostLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

func NewGetPostLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetPostLogic {
	return &GetPostLogic{
		ctx:    ctx,
		svcCtx: svcCtx,
		Logger: logx.WithContext(ctx),
	}
}

// 获取动态详情
func (l *GetPostLogic) GetPost(in *slowwildserver.GetPostReq) (*slowwildserver.GetPostRsp, error) {
	userId, _ := cast.ToInt64E(l.ctx.Value(constants.UserIDKey))
	if in.PostId <= 0 {
		return nil, errorx.ErrInvalidParam
	}

	// 获取帖子基本信息
	post, err := l.svcCtx.PostModel.GetPostDetail(l.ctx, in.PostId)
	if err != nil {
		l.Logger.Errorf("获取帖子详情失败: %v", err)
		return nil, errorx.ErrPostQueryFailed
	}

	// 获取帖子内容
	content, err := l.svcCtx.PostModel.GetPostContent(l.ctx, in.PostId)
	if err != nil {
		l.Logger.Errorf("获取帖子内容失败: %v", err)
		return nil, errorx.ErrPostQueryFailed
	}

	// 获取用户信息
	user, err := l.svcCtx.UserModel.FindOne(l.ctx, post.UserId)
	if err != nil {
		l.Logger.Errorf("获取用户信息失败: %v", err)
		return nil, errorx.ErrUserQueryFailed
	}

	// 获取话题信息
	var tagItems []*slowwildserver.TagItem
	if post.Tags != "" {
		tagStrs := strings.Split(post.Tags, ",")
		var tagIds []int64
		for _, tagStr := range tagStrs {
			tagId, err := strconv.ParseInt(tagStr, 10, 64)
			if err != nil {
				continue
			}
			tagIds = append(tagIds, tagId)
		}

		tags, err := l.svcCtx.TagModel.FindByIds(l.ctx, tagIds)
		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
			l.Logger.Errorf("获取话题信息失败: %v", err)
			return nil, errorx.ErrPostQueryFailed
		}

		for _, tag := range tags {
			tagItems = append(tagItems, &slowwildserver.TagItem{
				Id:   tag.ID,
				Name: tag.Name,
			})
		}
	}
	var isLiked, isCollected bool
	// 获取用户交互状态
	if userId > 0 {
		isLiked, err = l.svcCtx.UserModel.IsPostLikedByUser(l.ctx, userId, post.ID)
		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
			l.Logger.Errorf("查询用户点赞状态失败: %v", err)
			return nil, errorx.ErrPostQueryFailed
		}

		isCollected, err = l.svcCtx.UserModel.IsPostCollectedByUser(l.ctx, userId, post.ID)
		if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
			l.Logger.Errorf("查询用户收藏状态失败: %v", err)
			return nil, errorx.ErrPostQueryFailed
		}
	}

	// 获取@用户信息
	var atUserInfos []*slowwildserver.UserInfo
	if post.WithUserIds != "" {
		// 解析用户ID列表
		atUserIdStrs := strings.Split(post.WithUserIds, ",")
		var atUserIds []int64
		for _, idStr := range atUserIdStrs {
			userId, err := strconv.ParseInt(idStr, 10, 64)
			if err != nil {
				continue
			}
			atUserIds = append(atUserIds, userId)
		}

		// 批量获取用户信息
		if len(atUserIds) > 0 {
			atUsers, err := l.svcCtx.UserModel.FindByIds(l.ctx, atUserIds)
			if err != nil {
				l.Logger.Errorf("获取@用户信息失败: %v", err)
				return nil, errorx.ErrUserQueryFailed
			}

			// 构建用户信息列表
			for _, atUser := range atUsers {
				atUserInfos = append(atUserInfos, &slowwildserver.UserInfo{
					Id:       atUser.ID,
					Nickname: atUser.Nickname,
					Avatar:   atUser.Avatar,
					Sex:      int32(atUser.Sex),
				})
			}
		}
	}

	// 构建响应
	resp := &slowwildserver.GetPostRsp{
		Id: post.ID,
		User: &slowwildserver.UserInfo{
			Id:       user.ID,
			Nickname: user.Nickname,
			Avatar:   user.Avatar,
			Sex:      int32(user.Sex),
		},
		PostType:        post.PostType,
		Title:           content.Title,
		Content:         content.Content,
		ContentSummary:  content.ContentSummary,
		Images:          strings.Split(content.PostCovers, ","),
		VideoUrl:        content.PostVideoUrl,
		VideoCover:      content.PostVideoCover,
		CommentCount:    post.CommentCount,
		CollectionCount: post.CollectionCount,
		UpvoteCount:     post.UpvoteCount,
		ShareCount:      post.ShareCount,
		Tags:            tagItems,
		IpLoc:           post.IpLoc,
		HotNum:          post.HotNum,
		CreatedOn:       post.CreatedOn,
		IsLiked:         isLiked,
		IsCollected:     isCollected,
		IsMine:          userId == post.UserId,
		LatestRepliedOn: post.LatestRepliedOn,
		WithUser:        atUserInfos,
	}

	return resp, nil
}