/* openbills - Server for web based Libre Billing Software
 * Copyright (C) 2023-2025  Vidhu Kant Sharma <vidhukant@vidhukant.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

package item

import (
	"strconv"
	"strings"
	"vidhukant.com/openbills/errors"
)

func (i *SavedItem) validate() error {
	// trim whitespaces
	i.Name = strings.TrimSpace(i.Name)
	i.BrandName = strings.TrimSpace(i.BrandName)
	i.Category = strings.TrimSpace(i.Category)
	i.Description = strings.TrimSpace(i.Description)
	i.HSN = strings.TrimSpace(i.HSN)
	i.UnitOfMeasure = strings.TrimSpace(i.UnitOfMeasure)

	if len(i.Variants) == 0 {
		return errors.ErrNoItemVariants
	}

	var validatedVariants []ItemVariant
	for _, x := range i.Variants {
		err := x.validate()
		if err != nil {
			return err
		}

		validatedVariants = append(validatedVariants, x)
	}

	i.Variants = validatedVariants

	return nil
}

func (v *ItemVariant) validate() error {
	v.VariantName = strings.TrimSpace(v.VariantName)
	v.UnitPrice = strings.TrimSpace(v.UnitPrice)
	v.GSTPercentage = strings.TrimSpace(v.GSTPercentage)
	v.QuantityInStock = strings.TrimSpace(v.QuantityInStock)

	var err error

	// check if UnitPrice is float
	_, err = strconv.ParseFloat(v.UnitPrice, 64)
	if err != nil && v.UnitPrice != "" {
		return errors.ErrInvalidUnitPrice
	}

	// check if GSTPercentage is float
	_, err = strconv.ParseFloat(v.GSTPercentage, 64)
	if err != nil && v.GSTPercentage != "" {
		return errors.ErrInvalidGSTPercentage
	}

	// check if QuantityInStock is float
	_, err = strconv.ParseFloat(v.QuantityInStock, 64)
	if err != nil && v.QuantityInStock != "" {
		return errors.ErrInvalidGSTPercentage
	}

	return nil
}