feat(video): add like/unlike/isliked/getlikescount APIs for videos

internal/video/like_service.go

@@ -0,0 +1,38 @@
+package video
+
+import (
+	"context"
+	"errors"
+	"time"
+)
+
+type LikeService struct {
+	repo *LikeRepository
+}
+
+func NewLikeService(repo *LikeRepository) *LikeService {
+	return &LikeService{repo: repo}
+}
+
+func (s *LikeService) Like(ctx context.Context, like *Like) error {
+	if isLiked, err := s.IsLiked(ctx, like.VideoID, like.AccountID); err == nil && isLiked {
+		return errors.New("user has liked this video")
+	}
+	like.CreatedAt = time.Now()
+	return s.repo.Like(ctx, like)
+}
+
+func (s *LikeService) Unlike(ctx context.Context, like *Like) error {
+	if isLiked, err := s.IsLiked(ctx, like.VideoID, like.AccountID); err == nil && !isLiked {
+		return errors.New("user has not liked this video")
+	}
+	return s.repo.Unlike(ctx, like)
+}
+
+func (s *LikeService) IsLiked(ctx context.Context, videoID, accountID uint) (bool, error) {
+	return s.repo.IsLiked(ctx, videoID, accountID)
+}
+
+func (s *LikeService) GetLikesCount(ctx context.Context, videoID uint) (int64, error) {
+	return s.repo.GetLikesCount(ctx, videoID)
+}