81 lines
1.4 KiB
Go
81 lines
1.4 KiB
Go
package voucher
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import (
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"encoding/json"
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"errors"
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"fmt"
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"os"
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"git.tornberg.me/go-cart-actor/pkg/messages"
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)
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type Rule struct {
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Type string `json:"type"`
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Value int64 `json:"value"`
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}
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type Voucher struct {
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Code string `json:"code"`
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Value int64 `json:"discount"`
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rules []*messages.VoucherRule `json:"rules"`
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}
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type Service struct {
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// Add fields here
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}
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var ErrInvalidCode = errors.New("invalid vouchercode")
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func (s *Service) GetVoucher(code string) (*messages.AddVoucher, error) {
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if code == "" {
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return nil, ErrInvalidCode
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}
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sf, err := LoadStateFile("data/vouchers.json")
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if err != nil {
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return nil, err
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}
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v, ok := sf.GetVoucher(code)
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if !ok {
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return nil, fmt.Errorf("no voucher found for code: %s", code)
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}
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return &messages.AddVoucher{
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Code: code,
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Value: v.Value,
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VoucherRules: v.rules,
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}, nil
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}
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type State struct {
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Vouchers []Voucher `json:"vouchers"`
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}
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type StateFile struct {
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State State `json:"state"`
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Vercion int `json:"version"`
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}
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func (sf *StateFile) GetVoucher(code string) (*Voucher, bool) {
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for _, v := range sf.State.Vouchers {
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if v.Code == code {
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return &v, true
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}
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}
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return nil, false
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}
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func LoadStateFile(fileName string) (*StateFile, error) {
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f, err := os.Open(fileName)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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dec := json.NewDecoder(f)
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sf := &StateFile{}
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err = dec.Decode(sf)
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if err != nil {
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return nil, err
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}
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return sf, nil
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}
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