Implement artist GetByID

api/handlers/artist_handler.go

@@ -5,6 +5,7 @@ import (
 	"zardzul/music-index/repository"
 
 	"github.com/gin-gonic/gin"
+	"github.com/jackc/pgx/v5/pgtype"
 )
 
 type ArtistHandler struct {
@@ -31,3 +32,27 @@ func (handler *ArtistHandler) GetAll(c *gin.Context) {
 
 	c.JSON(http.StatusOK, artists)
 }
+
+// GetByID godoc
+// @Summary List artist by ID
+// @Tags artist
+// @produce json
+// @Param id path string true "Artist ID (UUID)"
+// @Success 200 {array} map[string]interface{}
+// @Failure 500 {object} ErrorResponse
+// @Router /artists/:id [get]
+func (handler *ArtistHandler) GetByID(c *gin.Context) {
+	idParam := c.Param("id")
+	var pgID pgtype.UUID
+	if err := pgID.Scan(idParam); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid artist id"})
+		return
+	}
+
+	artist, err := handler.repo.GetByID(c.Request.Context(), pgID)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, artist)
+}