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package store
import (
"context"
"errors"
"strings"
"time"
"airlines/pkg/model"
"gorm.io/driver/postgres"
"gorm.io/gorm"
"gorm.io/gorm/clause"
"gorm.io/gorm/logger"
)
type Store struct {
DB *gorm.DB
}
func NewStore(dsn string) (*Store, error) {
db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{
SkipDefaultTransaction: true,
PrepareStmt: true,
DisableNestedTransaction: true,
Logger: logger.Default.LogMode(logger.Silent),
})
if err != nil {
return nil, err
}
return &Store{DB: db}, nil
}
func (s *Store) AutoMigrate() error {
return s.DB.AutoMigrate(&model.User{}, &model.Card{}, &model.Flight{})
}
func (s *Store) SaveUser(ctx context.Context, in *model.User) (*model.User, error) {
if in == nil {
return nil, errors.New("nil user")
}
in.Nick = strings.TrimSpace(in.Nick)
in.Name = strings.TrimSpace(in.Name)
in.Surname = strings.TrimSpace(in.Surname)
in.Fathersname = strings.TrimSpace(in.Fathersname)
if in.Birthday.IsZero() {
in.Birthday = model.SentinelBirthday()
}
in.Birthday = in.Birthday.In(time.UTC)
out := &model.User{}
err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
// try by Nick
if in.Nick != "" {
if err := tx.Where("nick = ?", in.Nick).First(out).Error; err == nil {
return nil
} else if !errors.Is(err, gorm.ErrRecordNotFound) {
return err
}
}
// fallback by identity tuple
q := tx.Where("name = ? AND surname = ?", in.Name, in.Surname)
if in.Fathersname != "" {
q = q.Where("fathersname = ?", in.Fathersname)
} else {
q = q.Where("(fathersname IS NULL OR fathersname = '')")
}
if in.Birthday.Year() != model.SentinelBirthday().Year() {
q = q.Where("birthday = ?", in.Birthday)
}
if err := q.First(out).Error; err == nil {
return nil
} else if !errors.Is(err, gorm.ErrRecordNotFound) {
return err
}
// create
if err := tx.Create(in).Error; err != nil {
return err
}
*out = *in
return nil
})
return out, err
}
func (s *Store) SaveCard(ctx context.Context, in *model.Card) (*model.Card, error) {
if in == nil {
return nil, errors.New("nil card")
}
in.Prefix = strings.TrimSpace(in.Prefix)
in.Bonusprogramm = strings.TrimSpace(in.Bonusprogramm)
if in.Prefix == "" || in.Bonusprogramm == "" {
return nil, errors.New("invalid card: empty prefix or bonusprogramm")
}
out := &model.Card{}
err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
// find by unique triple
if err := tx.Where("prefix = ? AND number = ? AND bonusprogramm = ?",
in.Prefix, in.Number, in.Bonusprogramm).First(out).Error; err == nil {
// link to user once if requested and not yet linked
if in.UserID != 0 && out.UserID == 0 {
if err := tx.Model(out).Update("user_id", in.UserID).Error; err != nil {
return err
}
out.UserID = in.UserID
}
// refuse stealing
if in.UserID != 0 && out.UserID != 0 && out.UserID != in.UserID {
return errors.New("card already linked to another user")
}
return nil
} else if !errors.Is(err, gorm.ErrRecordNotFound) {
return err
}
// not found → create
if err := tx.Create(in).Error; err != nil {
return err
}
*out = *in
return nil
})
return out, err
}
func (s *Store) SaveFlight(ctx context.Context, in *model.Flight) (*model.Flight, error) {
if in == nil {
return nil, errors.New("nil flight")
}
in.Date = in.Date.In(time.UTC)
out := &model.Flight{}
err := s.DB.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
// try to find existing
if err := tx.Where(`"number" = ? AND "from" = ? AND "to" = ? AND "date" = ?`,
in.Number, in.From, in.To, in.Date).First(out).Error; err == nil {
// found
} else if errors.Is(err, gorm.ErrRecordNotFound) {
// not found → create
cre := model.Flight{
Number: in.Number,
From: in.From,
To: in.To,
Date: in.Date,
}
if err := tx.Clauses(clause.OnConflict{DoNothing: true}).Create(&cre).Error; err != nil {
return err
}
// on conflict, fetch the existing one
if cre.ID == 0 {
if err := tx.Where(`"number" = ? AND "from" = ? AND "to" = ? AND "date" = ?`,
in.Number, in.From, in.To, in.Date).First(&cre).Error; err != nil {
return err
}
}
*out = cre
} else {
return err
}
// many-to-many user-flight
if in.UserID != 0 {
u := model.User{ID: in.UserID}
if err := tx.Model(out).Association("Users").Append(&u); err != nil {
return err
}
}
// many-to-many flight-card
if in.CardID != 0 {
c := model.Card{ID: in.CardID}
if err := tx.Model(out).Association("Cards").Append(&c); err != nil {
return err
}
}
return nil
})
return out, err
}
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