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package auth
import (
"context"
"errors"
"log/slog"
"time"
"github.com/jackc/pgx/v5"
"golang.org/x/crypto/bcrypt"
"albatross-2026-backend/account"
"albatross-2026-backend/db"
"albatross-2026-backend/fortee"
)
var ErrForteeLoginTimeout = errors.New("fortee login timeout")
const (
forteeAPITimeout = 3 * time.Second
)
type Authenticator struct {
q db.Querier
txm db.TxManager
}
func NewAuthenticator(q db.Querier, txm db.TxManager) *Authenticator {
return &Authenticator{q: q, txm: txm}
}
func (a *Authenticator) Login(
ctx context.Context,
username string,
password string,
) (int, error) {
userAuth, err := a.q.GetUserAuthByUsername(ctx, username)
if err != nil && !errors.Is(err, pgx.ErrNoRows) {
return 0, err
}
if userAuth.AuthType == "password" {
passwordHash := userAuth.PasswordHash
if passwordHash == nil {
return 0, errors.New("inconsistent data: password auth type but no password hash")
}
err := bcrypt.CompareHashAndPassword([]byte(*passwordHash), []byte(password))
if err != nil {
return 0, err
}
return int(userAuth.UserID), nil
}
return a.verifyForteeAccountOrSignup(ctx, username, password)
}
func (a *Authenticator) verifyForteeAccountOrSignup(
ctx context.Context,
username string,
password string,
) (int, error) {
canonicalizedUsername, err := verifyForteeAccount(ctx, username, password)
if err != nil {
return 0, err
}
userID, err := a.q.GetUserIDByUsername(ctx, canonicalizedUsername)
if err != nil {
if errors.Is(err, pgx.ErrNoRows) {
return a.signup(ctx, canonicalizedUsername)
}
return 0, err
}
return int(userID), nil
}
func (a *Authenticator) signup(
ctx context.Context,
username string,
) (int, error) {
var userID int32
err := a.txm.RunInTx(ctx, func(qtx db.Querier) error {
var err error
userID, err = qtx.CreateUser(ctx, username)
if err != nil {
return err
}
return qtx.CreateUserAuth(ctx, db.CreateUserAuthParams{
UserID: userID,
AuthType: "fortee",
})
})
if err != nil {
return 0, err
}
go func() {
err := account.FetchIcon(context.Background(), a.q, int(userID))
if err != nil {
slog.Error("failed to fetch icon", "error", err)
}
}()
return int(userID), nil
}
func verifyForteeAccount(ctx context.Context, username string, password string) (string, error) {
ctx, cancel := context.WithTimeout(ctx, forteeAPITimeout)
defer cancel()
canonicalizedUsername, err := fortee.Login(ctx, username, password)
if errors.Is(err, context.DeadlineExceeded) {
return "", ErrForteeLoginTimeout
}
return canonicalizedUsername, err
}
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