// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-present Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package user

import (
	"testing"
	"time"

	"code.vikunja.io/api/pkg/db"
	"code.vikunja.io/api/pkg/modules/keyvalue"

	"github.com/pquerna/otp/totp"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestTOTPPasscodeCannotBeReused(t *testing.T) {
	db.LoadAndAssertFixtures(t)
	s := db.NewSession()
	defer s.Close()

	// Generate a valid TOTP passcode for user10's secret from the fixture
	// user10 has TOTP enabled with this secret in pkg/db/fixtures/totp.yml
	secret := "JBSWY3DPEHPK3PXP" //nolint:gosec
	passcode, err := totp.GenerateCode(secret, time.Now())
	require.NoError(t, err)

	user := &User{ID: 10}

	// First use should succeed
	_, err = ValidateTOTPPasscode(s, &TOTPPasscode{
		User:     user,
		Passcode: passcode,
	})
	require.NoError(t, err)

	// Second use of the same passcode should fail
	_, err = ValidateTOTPPasscode(s, &TOTPPasscode{
		User:     user,
		Passcode: passcode,
	})
	require.Error(t, err)
	assert.True(t, IsErrTOTPPasscodeUsed(err), "expected ErrTOTPPasscodeUsed, got: %v", err)
}

func TestHandleFailedTOTPAuthLocksAccount(t *testing.T) {
	db.LoadAndAssertFixtures(t)

	user := &User{ID: 10}

	// keyvalue store is process-global; reset counter between runs.
	_ = keyvalue.Del(user.GetFailedTOTPAttemptsKey())

	for i := 0; i < 10; i++ {
		s := db.NewSession()
		HandleFailedTOTPAuth(user)
		require.NoError(t, s.Rollback())
		require.NoError(t, s.Close())
	}

	s := db.NewSession()
	defer s.Close()
	fresh, err := GetUserByID(s, user.ID)
	require.Error(t, err)
	assert.True(t, IsErrAccountLocked(err), "expected ErrAccountLocked, got: %v", err)
	assert.Equal(t, StatusAccountLocked, fresh.Status)
}

func TestHandleFailedTOTPAuthLockoutCanBeUnlockedByPasswordReset(t *testing.T) {
	db.LoadAndAssertFixtures(t)

	user := &User{ID: 10}
	// keyvalue store is process-global; reset counter between runs.
	_ = keyvalue.Del(user.GetFailedTOTPAttemptsKey())

	for i := 0; i < 10; i++ {
		s := db.NewSession()
		HandleFailedTOTPAuth(user)
		require.NoError(t, s.Rollback())
		require.NoError(t, s.Close())
	}

	// Fetch the token from the DB (not a fresh one) so regressions where
	// the lockout flow fails to persist a reset token are caught.
	s := db.NewSession()
	defer s.Close()
	full, err := GetUserByID(s, user.ID)
	require.Error(t, err)
	require.True(t, IsErrAccountLocked(err))
	require.Equal(t, StatusAccountLocked, full.Status)

	tokens, err := getTokensForKind(s, full, TokenPasswordReset)
	require.NoError(t, err)
	require.NotEmpty(t, tokens, "HandleFailedTOTPAuth should have persisted a password reset token")
	token := tokens[len(tokens)-1]
	require.NoError(t, s.Commit())

	s2 := db.NewSession()
	defer s2.Close()
	_, err = ResetPassword(s2, &PasswordReset{
		Token:       token.Token,
		NewPassword: "new-password-123",
	})
	require.NoError(t, err)
	require.NoError(t, s2.Commit())

	s3 := db.NewSession()
	defer s3.Close()
	unlocked, err := GetUserByID(s3, user.ID)
	require.NoError(t, err)
	assert.Equal(t, StatusActive, unlocked.Status)
}