package gateway

import (
	"errors"

	"gorm.io/gorm"

	"github.com/wangjia/pay/internal/model"
	"github.com/wangjia/pay/internal/money"
)

// DBProductResolver resolves a SKU (product biz_code) against the products table.
// v1 Product.Price is a "元" string; we parse it into int64 minor units for the
// given settlement currency. 加币种维度到 product 是 P3+ 的事;P2 用单一默认币种。
type DBProductResolver struct {
	db       *gorm.DB
	currency string
}

func NewDBProductResolver(db *gorm.DB, currency string) *DBProductResolver {
	if currency == "" {
		currency = "CNY"
	}
	return &DBProductResolver{db: db, currency: currency}
}

func (r *DBProductResolver) Resolve(sku string) (int64, string, string, string, error) {
	var p model.Product
	err := r.db.Where("biz_code = ? AND active = ?", sku, true).First(&p).Error
	if errors.Is(err, gorm.ErrRecordNotFound) {
		return 0, "", "", "", ErrProductNotFound
	}
	if err != nil {
		return 0, "", "", "", err
	}
	minor, err := money.Parse(p.Price, r.currency)
	if err != nil {
		return 0, "", "", "", err
	}
	return minor, r.currency, p.Name, p.BizCode, nil
}