package logic

import (
	"context"
	"errors"

	"juwan-backend/app/community/rpc/internal/svc"
	"juwan-backend/app/community/rpc/pb"

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

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

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

func (l *DelPostLikesLogic) DelPostLikes(in *pb.DelPostLikesReq) (*pb.DelPostLikesResp, error) {
	if in.GetId() <= 0 {
		return nil, errors.New("id is required")
	}

	store := l.svcCtx.Store
	store.Mu.Lock()
	defer store.Mu.Unlock()

	if in.UserId != nil && in.GetUserId() > 0 {
		key := postLikeKey(in.GetId(), in.GetUserId())
		if _, ok := store.PostLikes[key]; ok {
			delete(store.PostLikes, key)
			if post, ok := store.Posts[in.GetId()]; ok && post.LikeCount > 0 {
				post.LikeCount--
			}
		}
		return &pb.DelPostLikesResp{}, nil
	}

	removed := int64(0)
	for key, like := range store.PostLikes {
		if like.GetPostId() == in.GetId() {
			delete(store.PostLikes, key)
			removed++
		}
	}
	if removed > 0 {
		if post, ok := store.Posts[in.GetId()]; ok {
			if post.LikeCount >= removed {
				post.LikeCount -= removed
			} else {
				post.LikeCount = 0
			}
		}
	}

	return &pb.DelPostLikesResp{}, nil
}