110 lines
2.3 KiB
Go
110 lines
2.3 KiB
Go
package cart
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import (
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"context"
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"errors"
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"strconv"
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"cake_crm/internal/modules/storage"
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"cake_crm/proto"
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)
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type ProductAndCount struct {
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product *proto.Product
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count int64
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}
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type Service struct {
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storage storage.IStorage
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}
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func NewService(storage storage.IStorage) *Service {
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return &Service{
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storage: storage,
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}
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}
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func (s *Service) GetCart(ctx context.Context, items []*proto.OrderItem) (*proto.CartRsp, error) {
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var cartAmount int64
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var cartAmountOld int64
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res := make([]*proto.CartItem, 0, len(items))
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for _, item := range items {
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product, err := s.storage.GetProduct(ctx, item.ProductId)
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if err != nil {
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return nil, err
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}
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amount, amountOld, err := calcItemAmount(
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&ProductAndCount{
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product: product,
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count: item.Count,
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},
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)
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if err != nil {
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return nil, err
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}
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res = append(
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res,
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&proto.CartItem{
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Id: product.Id,
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Article: product.Article,
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Name: product.Name,
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Uri: product.Uri,
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Images: product.Images,
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Unit: product.Unit,
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Inventory: product.Inventory,
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Count: item.Count,
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Amount: amount,
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AmountOld: amountOld,
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Discount: amountOld - amount,
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Variants: product.Variants,
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Labels: product.Labels,
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},
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)
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cartAmount += amount
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cartAmountOld += amountOld
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}
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return &proto.CartRsp{
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Items: res,
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Amount: cartAmount,
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AmountOld: cartAmountOld,
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Discount: cartAmountOld - cartAmount,
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}, nil
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}
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func calcItemAmount(item *ProductAndCount) (int64, int64, error) {
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variantOld := item.product.Variants[0]
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var variant *proto.Variant
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for _, v := range item.product.Variants {
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check := true
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for _, property := range v.Properties {
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if property.Name == "min" {
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minBorder, err := strconv.ParseInt(property.Value, 10, 64)
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if err != nil {
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return 0, 0, err
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}
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if item.count < minBorder {
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check = false
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}
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}
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if property.Name == "max" {
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maxBorder, err := strconv.ParseInt(property.Value, 10, 64)
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if err != nil {
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return 0, 0, err
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}
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if item.count > maxBorder {
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check = false
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}
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}
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if check {
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variant = v
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break
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}
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}
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}
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variant.Active = true
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if variant == nil {
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return 0, 0, errors.New("variant not found")
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}
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return variant.Price * item.count, variantOld.Price * item.count, nil
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}
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