Implement DELETE /task/{taskId} (#51)

Close #47

Reviewed-on: #51

backend/main.go

@@ -333,6 +333,37 @@ func putTask(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "Task updated successfully"})
 }
 
+func deleteTask(c *gin.Context) {
+	taskIdStr := c.Param("taskId")
+	taskId, err := strconv.Atoi(taskIdStr)
+	if err != nil {
+		log.Printf("Invalid task ID: %v", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid task ID"})
+		return
+	}
+
+	hasTask, err := db.HasTask(taskId)
+	if err != nil {
+		log.Printf("Error checking task existence: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+
+	if !hasTask {
+		c.JSON(http.StatusNotFound, gin.H{"error": "Task not found"})
+		return
+	}
+
+	err = db.DeleteTask(taskId)
+	if err != nil {
+		log.Printf("Error deleting task: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"message": "Task deleted successfully"})
+}
+
 func postHistory(c *gin.Context) {
 	userIdStr := c.Param("userId")
 	userId, err := strconv.Atoi(userIdStr)
@@ -412,6 +443,7 @@ func start(ctx context.Context, config *ServerConfig) {
 	router.GET("/api/tasks", getTasks)
 	router.GET("/api/task/:taskId", getTask)
 	router.PUT("/api/task/:taskId", putTask)
+	router.DELETE("/api/task/:taskId", deleteTask)
 
 	srv := &http.Server{
 		Addr:    config.Addr,