package order

import (
	"bytes"
	"cake_crm/proto"
	"errors"
	"fmt"
)

type Service struct{}

func NewService() *Service {
	return &Service{}
}

func (s *Service) CreateOrderText(req *proto.OrderReq, items []*proto.CardItem) (string, error) {
	buffer := bytes.Buffer{}
	var orderAmount int64
	buffer.WriteString(fmt.Sprintf("Заказ от:\n%s\n%s\n", req.Order.Name, req.Order.Phone))
	buffer.WriteString("\n")
	for _, item := range items {
		buffer.WriteString(item.Name)
		buffer.WriteString("\n")
		unit, err := unitToText(item.Unit)
		if err != nil {
			return "", err
		}
		buffer.WriteString(fmt.Sprintf("Количество: %d%s\n", item.Count, unit))
		orderAmount += item.Amount
		buffer.WriteString(fmt.Sprintf("Сумма: %.00fр\n", float64(item.Amount)/100))
		buffer.WriteString("\n")
	}
	buffer.WriteString("\n")
	buffer.WriteString(fmt.Sprintf("ИТОГО: %.00fр\n", float64(orderAmount)/100))
	return buffer.String(), nil
}

func unitToText(unit string) (string, error) {
	switch unit {
	case "kg":
		return "кг", nil
	case "piece":
		return "шт", nil
	}
	return "", errors.New("unit not found")
}