// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package hwsec

import (
	"context"

	"chromiumos/tast/common/hwsec"
	hwsecremote "chromiumos/tast/remote/hwsec"
	"chromiumos/tast/testing"
)

func init() {
	testing.AddTest(&testing.Test{
		Func:         RetakeOwnershipFlushPassword,
		Desc:         "Verifies that taking ownership produce a new owner password",
		Contacts:     []string{"cylai@chromium.org", "cros-hwsec@google.com"},
		SoftwareDeps: []string{"reboot", "tpm"},
		Attr:         []string{"group:hwsec_destructive_func"},
	})
}

func RetakeOwnershipFlushPassword(ctx context.Context, s *testing.State) {
	r := hwsecremote.NewCmdRunner(s.DUT())

	helper, err := hwsecremote.NewHelper(r, s.DUT())
	if err != nil {
		s.Fatal("Helper creation error: ", err)
	}

	tpmManager := helper.TPMManagerClient()

	s.Log("Start resetting TPM if needed")
	if err := helper.EnsureTPMIsReset(ctx); err != nil {
		s.Fatal("Failed to ensure resetting TPM: ", err)
	}
	s.Log("TPM is confirmed to be reset")

	s.Log("Start taking ownership")
	if err := helper.EnsureTPMIsReady(ctx, hwsec.DefaultTakingOwnershipTimeout); err != nil {
		s.Fatal("Failed to ensure ownership: ", err)
	}
	s.Log("Ownership is taken")

	passwd, err := tpmManager.GetOwnerPassword(ctx)
	if err != nil {
		s.Fatal("Failed to get owner password: ", err)
	}
	if len(passwd) != hwsec.OwnerPasswordLength {
		s.Fatal("Ill-formed owner password: ", passwd)
	}
	s.Log("Start resetting TPM again")
	if err := helper.EnsureTPMIsReset(ctx); err != nil {
		s.Fatal("Failed to ensure resetting TPM: ", err)
	}
	s.Log("TPM is confirmed to be reset")

	passwd2, err := tpmManager.GetOwnerPassword(ctx)
	if err != nil {
		s.Fatal("Failed to get owner password: ", err)
	}
	if len(passwd2) != 0 {
		s.Fatal("Non-empty owner password after reset: ", passwd2)
	}

	s.Log("Start taking ownership again")
	if err := helper.EnsureTPMIsReady(ctx, hwsec.DefaultTakingOwnershipTimeout); err != nil {
		s.Fatal("Failed to ensure ownership: ", err)
	}
	s.Log("Ownership is taken")

	passwd2, err = tpmManager.GetOwnerPassword(ctx)
	if err != nil {
		s.Fatal("Failed to get owner password: ", err)
	}
	if len(passwd2) != hwsec.OwnerPasswordLength {
		s.Fatal("Ill-formed owner password: ", passwd2)
	}
	if passwd == passwd2 {
		s.Fatal("Owner password wasn't changed: ", passwd2)
	}

}