voucher change

pkg/voucher/service.go

@@ -1,7 +1,10 @@
 package voucher
 
 import (
+	"encoding/json"
 	"errors"
+	"fmt"
+	"os"
 
 	"git.tornberg.me/go-cart-actor/pkg/messages"
 )
@@ -12,11 +15,9 @@ type Rule struct {
 }
 
 type Voucher struct {
-	Code     string `json:"code"`
-	Value    int64  `json:"discount"`
-	TaxValue int64  `json:"taxValue"`
-	TaxRate  int    `json:"taxRate"`
-	rules    []Rule `json:"rules"`
+	Code  string                  `json:"code"`
+	Value int64                   `json:"discount"`
+	rules []*messages.VoucherRule `json:"rules"`
 }
 
 type Service struct {
@@ -29,10 +30,51 @@ func (s *Service) GetVoucher(code string) (*messages.AddVoucher, error) {
 	if code == "" {
 		return nil, ErrInvalidCode
 	}
-	value := int64(250_00)
+	sf, err := LoadStateFile("data/vouchers.json")
+	if err != nil {
+		return nil, err
+	}
+	v, ok := sf.GetVoucher(code)
+	if !ok {
+		return nil, fmt.Errorf("no voucher found for code: %s", code)
+	}
+
 	return &messages.AddVoucher{
 		Code:         code,
-		Value:        value,
-		VoucherRules: make([]*messages.VoucherRule, 0),
+		Value:        v.Value,
+		VoucherRules: v.rules,
 	}, nil
 }
+
+type State struct {
+	Vouchers []Voucher `json:"vouchers"`
+}
+
+type StateFile struct {
+	State   State `json:"state"`
+	Vercion int   `json:"version"`
+}
+
+func (sf *StateFile) GetVoucher(code string) (*Voucher, bool) {
+	for _, v := range sf.State.Vouchers {
+		if v.Code == code {
+			return &v, true
+		}
+	}
+	return nil, false
+}
+
+func LoadStateFile(fileName string) (*StateFile, error) {
+	f, err := os.Open(fileName)
+	if err != nil {
+		return nil, err
+	}
+	defer f.Close()
+	dec := json.NewDecoder(f)
+	sf := &StateFile{}
+	err = dec.Decode(sf)
+	if err != nil {
+		return nil, err
+	}
+	return sf, nil
+}