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coupon.go
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/
coupon.go
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package coupon
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"strings"
"github.com/shopspring/decimal"
"github.com/asia-loop-gmbh/asia-loop-utils-go/v5/pkg/servicewoo"
"github.com/nam-truong-le/lambda-utils-go/v3/pkg/logger"
)
func IsValidAndHasEnough(ctx context.Context, code, appliedAmount string) bool {
log := logger.FromContext(ctx)
log.Infof("check coupon valid and has enough amount: %s", code)
coupon, err := GetCouponByCode(ctx, code)
if err != nil {
log.Errorf("could not get coupon '%s': %s", code, err)
return false
}
current, err := decimal.NewFromString(coupon.Amount)
if err != nil {
return false
}
toUse, err := decimal.NewFromString(appliedAmount)
if err != nil {
return false
}
return current.Cmp(toUse) > 0
}
func GetCouponByCode(ctx context.Context, code string) (*servicewoo.Coupon, error) {
log := logger.FromContext(ctx)
log.Infof("get coupon: %s", code)
code = strings.TrimSpace(code)
if code == "" {
return nil, fmt.Errorf("blank coupon code")
}
serviceWoo, err := servicewoo.NewWoo(ctx)
if err != nil {
return nil, err
}
response, err := http.Get(serviceWoo.NewURL(ctx, fmt.Sprintf("/coupons?code=%s", code)))
if err != nil {
return nil, err
}
defer func(Body io.ReadCloser) {
err := Body.Close()
if err != nil {
log.Warnf("failed to close response body: %s", err)
}
}(response.Body)
responseBody, err := io.ReadAll(response.Body)
if err != nil {
return nil, err
}
coupons := make([]servicewoo.Coupon, 0)
if err := json.Unmarshal(responseBody, &coupons); err != nil {
return nil, err
}
if len(coupons) == 0 {
return nil, fmt.Errorf("coupon code '%s' not found", code)
}
if len(coupons) > 1 {
return nil, fmt.Errorf("multiple coupon codes found for '%s'", code)
}
return &coupons[0], nil
}
func UpdateCouponByCode(ctx context.Context, code, amount string) error {
log := logger.FromContext(ctx)
log.Infof("update coupon %s: %s", code, amount)
coupon, err := GetCouponByCode(ctx, code)
if err != nil {
return err
}
toUse, err := decimal.NewFromString(amount)
if err != nil {
return err
}
currentAmount, err := decimal.NewFromString(coupon.Amount)
if err != nil {
return err
}
newAmount := currentAmount.Sub(toUse)
updateCoupon := servicewoo.Coupon{
Amount: newAmount.StringFixed(2),
}
serviceWoo, err := servicewoo.NewWoo(ctx)
if err != nil {
return err
}
requestBody, err := json.Marshal(updateCoupon)
if err != nil {
return err
}
log.Infof("update coupon request body: %s", string(requestBody))
url := serviceWoo.NewURL(ctx, fmt.Sprintf("/coupons/%d", coupon.ID))
log.Infof("PUT -> %s", url)
httpClient := http.Client{}
request, err := http.NewRequest(
http.MethodPut,
url,
bytes.NewBuffer(requestBody),
)
if err != nil {
return err
}
request.Header.Set("Content-Type", "application/json")
response, err := httpClient.Do(request)
if err != nil {
return err
}
defer func(Body io.ReadCloser) {
err := Body.Close()
if err != nil {
log.Warnf("failed to close response body: %s", err)
}
}(response.Body)
responseBody, err := io.ReadAll(response.Body)
if err != nil {
return err
}
log.Infof("response: %s", string(responseBody))
if response.StatusCode >= 300 {
return fmt.Errorf("could not update coupon, error '%d': %s", response.StatusCode, string(responseBody))
}
return nil
}