Add endpoint to create allowance (#34)

Closes #11

Reviewed-on: #34

backend/main.go

@@ -289,6 +289,31 @@ func putTask(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"message": "Task updated successfully"})
 }
 
+func postAllowance(c *gin.Context) {
+	userIdStr := c.Param("userId")
+	userId, err := strconv.Atoi(userIdStr)
+	if err != nil {
+		log.Printf("Invalid user ID: %v", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid user ID"})
+		return
+	}
+
+	var allowanceRequest PostAllowance
+	if err := c.ShouldBindJSON(&allowanceRequest); err != nil {
+		log.Printf("Error parsing request body: %v", err)
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid request body"})
+		return
+	}
+
+	err = db.AddAllowance(userId, &allowanceRequest)
+	if err != nil {
+		log.Printf("Error updating allowance: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"message": "Allowance updated successfully"})
+}
+
 /*
 *
 Initialises the database, and then starts the server.
@@ -308,6 +333,7 @@ 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.POST("/api/user/:userId/allowance", postAllowance)
 
 	srv := &http.Server{
 		Addr:    config.Addr,