package usecase

import (
	"backend/internal/domain"
	"context"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/google/uuid"
)

type AuthService interface {
	GenerateChallenge(ctx context.Context, pubKey string) (*domain.Challenge, error)
}

type authService struct {
	userRepo        *domain.UserRepo
	sessionRepo     *domain.SessionRepo
	challengeExp    uint
	tokenExp        uint
	refreshTokenExp uint
}

func NewAuthService(
	userRepo *domain.UserRepo,
	sessionRepo *domain.SessionRepo,
	challengeExp uint,
	tokenExp uint,
	refreshTokenExp uint) AuthService {
	return &authService{
		userRepo:        userRepo,
		sessionRepo:     sessionRepo,
		challengeExp:    challengeExp,
		tokenExp:        tokenExp,
		refreshTokenExp: refreshTokenExp,
	}
}

func (s *authService) GenerateChallenge(ctx context.Context, pubKey string) (*domain.Challenge, error) {
	if !common.IsHexAddress(pubKey) {
		return nil, domain.ErrWalletInvalid
	}
	challenge := &domain.Challenge{
		Message:   uuid.New(),
		TimeStamp: time.Now().UTC(),
		ExpiresAt: time.Now().Add(time.Duration(s.challengeExp) * time.Minute),
	}
	return challenge, nil
}