Add food update

foodservice.go

@@ -11,7 +11,7 @@ type (
 		db *DB
 	}
 	Food struct {
-		rowid      int
+		rowid      int64
 		date       string
 		food       string
 		descripton string
@@ -92,6 +92,35 @@ func (s *FoodService) Create(food Food) (Food, error) {
 	return s.GetByRowid(rowid)
 }
 
+func (s *FoodService) Update(food Food) (Food, error) {
+	if s.db == nil || !s.db.Ready {
+		return food, fmt.Errorf("cannot update food, db is nil or is not ready")
+	}
+	if food.rowid <= 0 {
+		return food, fmt.Errorf("cannot update food, rowid is less than or equal to 0")
+	}
+	if food.food == "" {
+		return food, fmt.Errorf("cannot update food, food is empty")
+	}
+	if food.amount <= 0 {
+		return food, fmt.Errorf("cannot update food, amount is less than or equal to 0")
+	}
+
+	if food.per100 > 0 {
+		_, err := s.db.writeConn.Exec("UPDATE food SET food = ?, description = ?, amount = ?, per100 = ? WHERE rowid = ?", food.food, food.descripton, food.amount, food.per100, food.rowid)
+		if err != nil {
+			return food, fmt.Errorf("error updating food: %v", err)
+		}
+	} else {
+		_, err := s.db.writeConn.Exec("UPDATE food SET food = ?, description = ?, amount = ? WHERE rowid = ?", food.food, food.descripton, food.amount, food.rowid)
+		if err != nil {
+			return food, fmt.Errorf("error updating food: %v", err)
+		}
+	}
+
+	return s.GetByRowid(food.rowid)
+}
+
 func (s *FoodService) GetByRowid(rowid int64) (Food, error) {
 	var res Food
 	if s.db == nil || !s.db.Ready {