package logic

import (
	"context"
	"slowwild/internal/errorx"
	"slowwild/internal/model"
	"slowwild/internal/svc"
	"time"

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

	"slowwild/internal/constants"

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

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

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

// 点赞帖子
func (l *PostUpvoteLogic) PostUpvote(in *slowwildserver.PostUpvoteReq) (*slowwildserver.PostUpvoteRsp, error) {
	// 从context中获取userId
	userId, err := cast.ToInt64E(l.ctx.Value(constants.UserIDKey))
	if err != nil {
		return nil, errorx.ErrInvalidParam
	}

	if in.PostId <= 0 {
		return nil, errorx.ErrInvalidParam
	}

	// 开启事务
	err = l.svcCtx.UserModel.Transaction(l.ctx, func(tx *gorm.DB) error {
		postModel := model.NewPostModel(tx, l.svcCtx.Redis)
		postActionModel := model.NewPostActionModel(tx, l.svcCtx.Redis)
		messageModel := model.NewMessageModel(tx)

		// 获取帖子信息
		post, err := postModel.GetPostDetail(l.ctx, in.PostId)
		if err != nil {
			return err
		}

		// 检查是否已经点赞过
		isLiked, err := postActionModel.CheckPostAction(l.ctx, userId, in.PostId, 0) // 0表示点赞动作
		if err != nil {
			return err
		}

		if !isLiked {
			// 创建点赞记录
			postAction := &model.PostAction{
				Model: &model.Model{
					CreatedOn:  time.Now().Unix(),
					ModifiedOn: time.Now().Unix(),
				},
				PostId:     in.PostId,
				UserId:     userId,
				ActionType: 0, // 0表示点赞
			}
			if err := postActionModel.CreatePostAction(l.ctx, postAction); err != nil {
				return err
			}

			// 增加点赞数
			if err := postModel.IncrementUpvoteCount(l.ctx, in.PostId, 1); err != nil {
				return err
			}

			// 如果不是点赞自己的帖子，发送消息通知
			if post.UserId != userId {
				err = messageModel.SendNotification(l.ctx, userId, post.UserId, 6,
					"点赞通知",
					"有人点赞了你的动态",
					in.PostId, 0, 0)
				if err != nil {
					return err
				}
			}
		} else {
			// 取消点赞
			postAction := &model.PostAction{
				Model: &model.Model{
					ModifiedOn: time.Now().Unix(),
					DeletedOn:  time.Now().Unix(),
					IsDel:      1,
				},
				PostId:     in.PostId,
				UserId:     userId,
				ActionType: 0,
			}
			if err := postActionModel.DeletePostAction(l.ctx, postAction); err != nil {
				return err
			}

			// 减少点赞数
			if err := postModel.IncrementUpvoteCount(l.ctx, in.PostId, -1); err != nil {
				return err
			}
		}

		return nil
	})

	if err != nil {
		l.Logger.Errorf("帖子点赞失败: %v", err)
		return nil, err
	}

	return &slowwildserver.PostUpvoteRsp{}, nil
}