/*
 Derived from source code of TrueCrypt 7.1a, which is
 Copyright (c) 2008-2012 TrueCrypt Developers Association and which is governed
 by the TrueCrypt License 3.0.

 Modifications and additions to the original source code (contained in this file)
 and all other portions of this file are Copyright (c) 2013-2017 IDRIX
 and are governed by the Apache License 2.0 the full text of which is
 contained in the file License.txt included in VeraCrypt binary and source
 code distribution packages.
*/

#include "System.h"
#include "Main/Main.h"
#include "Main/GraphicUserInterface.h"
#include "ChangePasswordDialog.h"
#include "WaitDialog.h"

namespace VeraCrypt
{
#ifdef TC_MACOSX

	bool ChangePasswordDialog::ProcessEvent(wxEvent& event)
	{
		if(GraphicUserInterface::HandlePasswordEntryCustomEvent (event))
			return true;
		else
			return ChangePasswordDialogBase::ProcessEvent(event);
	}
#endif

	ChangePasswordDialog::ChangePasswordDialog (wxWindow* parent, shared_ptr <VolumePath> volumePath, Mode::Enum mode, shared_ptr <VolumePassword> password, shared_ptr <KeyfileList> keyfiles, shared_ptr <VolumePassword> newPassword, shared_ptr <KeyfileList> newKeyfiles)
		: ChangePasswordDialogBase (parent), DialogMode (mode), Path (volumePath)
	{
		bool enableNewPassword = false;
		bool enableNewKeyfiles = false;
		bool enablePkcs5Prf = false;

		switch (mode)
		{
		case Mode::ChangePasswordAndKeyfiles:
			enableNewPassword = true;
			enableNewKeyfiles = true;
			enablePkcs5Prf = true;
			SetTitle (LangString["IDD_PASSWORDCHANGE_DLG"]);
			break;

		case Mode::ChangeKeyfiles:
			enableNewKeyfiles = true;
			SetTitle (LangString["IDD_PCDM_ADD_REMOVE_VOL_KEYFILES"]);
			break;

		case Mode::RemoveAllKeyfiles:
			SetTitle (LangString["IDD_PCDM_REMOVE_ALL_KEYFILES_FROM_VOL"]);
			break;

		case Mode::ChangePkcs5Prf:
			enablePkcs5Prf = true;
			SetTitle (LangString["IDD_PCDM_CHANGE_PKCS5_PRF"]);
			break;

		default:
			throw ParameterIncorrect (SRC_POS);
		}
		
#ifdef TC_MACOSX
		GraphicUserInterface::InstallPasswordEntryCustomKeyboardShortcuts (this);
#endif

		CurrentPasswordPanel = new VolumePasswordPanel (this, NULL, password, keyfiles, false, true, true, false, true, true);
		CurrentPasswordPanel->UpdateEvent.Connect (EventConnector <ChangePasswordDialog> (this, &ChangePasswordDialog::OnPasswordPanelUpdate));
		CurrentPasswordPanelSizer->Add (CurrentPasswordPanel, 1, wxALL | wxEXPAND);

		NewPasswordPanel = new VolumePasswordPanel (this, NULL, newPassword, newKeyfiles, false, enableNewPassword, enableNewKeyfiles, enableNewPassword, enablePkcs5Prf);
		NewPasswordPanel->UpdateEvent.Connect (EventConnector <ChangePasswordDialog> (this, &ChangePasswordDialog::OnPasswordPanelUpdate));
		NewPasswordPanelSizer->Add (NewPasswordPanel, 1, wxALL | wxEXPAND);

		if (mode == Mode::RemoveAllKeyfiles)
			NewSizer->Show (false);

		Layout();
		Fit();
		Center();

		OnPasswordPanelUpdate();
		CurrentPasswordPanel->SetFocusToPasswordTextCtrl();
	}

	ChangePasswordDialog::~ChangePasswordDialog ()
	{
		CurrentPasswordPanel->UpdateEvent.Disconnect (this);
		NewPasswordPanel->UpdateEvent.Disconnect (this);
	}

	void ChangePasswordDialog::OnOKButtonClick (wxCommandEvent& event)
	{
		// Avoid a GTK bug
		if (!OKButton->IsEnabled())
			return;

		try
		{
			shared_ptr <Pkcs5Kdf> currentKdf = CurrentPasswordPanel->GetPkcs5Kdf();
			int currentPim = CurrentPasswordPanel->GetVolumePim();
			if (-1 == currentPim)
			{
				CurrentPasswordPanel->SetFocusToPimTextCtrl();
				return;
			}

			shared_ptr <VolumePassword> newPassword;
			int newPim = 0;
			if (DialogMode == Mode::ChangePasswordAndKeyfiles)
			{
				try
				{
					newPassword = NewPasswordPanel->GetPassword();
				}
				catch (PasswordException& e)
				{
					Gui->ShowWarning (e);
					NewPasswordPanel->SetFocusToPasswordTextCtrl();
					return;
				}
				newPim = NewPasswordPanel->GetVolumePim();
				if (-1 == newPim)
				{
					NewPasswordPanel->SetFocusToPimTextCtrl();
					return;
				}

				if (newPassword->Size() > 0)
				{
					if (newPassword->Size() < VolumePassword::WarningSizeThreshold)
					{
						if (newPim > 0 && newPim < 485)
						{
							Gui->ShowError ("PIM_REQUIRE_LONG_PASSWORD");
							return;
						}

						if (!Gui->AskYesNo (LangString ["PASSWORD_LENGTH_WARNING"], false, true))
						{
							NewPasswordPanel->SetFocusToPasswordTextCtrl();
							return;
						}
					}
					else if (newPim > 0 && newPim < 485)
					{
						if (!Gui->AskYesNo (LangString ["PIM_SMALL_WARNING"], false, true))
						{
							NewPasswordPanel->SetFocusToPimTextCtrl();
							return;
						}
					}
				}
			}
			else
			{
				newPassword = CurrentPasswordPanel->GetPassword();
				newPim = CurrentPasswordPanel->GetVolumePim();
			}

			shared_ptr <KeyfileList> newKeyfiles;
			if (DialogMode == Mode::ChangePasswordAndKeyfiles || DialogMode == Mode::ChangeKeyfiles)
				newKeyfiles = NewPasswordPanel->GetKeyfiles();
			else if (DialogMode != Mode::RemoveAllKeyfiles)
				newKeyfiles = CurrentPasswordPanel->GetKeyfiles();

			/* force the display of the random enriching interface */
			RandomNumberGenerator::SetEnrichedByUserStatus (false);
			Gui->UserEnrichRandomPool (this, NewPasswordPanel->GetPkcs5Kdf() ? NewPasswordPanel->GetPkcs5Kdf()->GetHash() : shared_ptr <Hash>());

			bool masterKeyVulnerable = false;
			{
#ifdef TC_UNIX
				// Temporarily take ownership of a device if the user is not an administrator
				UserId origDeviceOwner ((uid_t) -1);

				if (!Core->HasAdminPrivileges() && Path->IsDevice())
				{
					origDeviceOwner = FilesystemPath (wstring (*Path)).GetOwner();
					Core->SetFileOwner (*Path, UserId (getuid()));
				}

				finally_do_arg2 (FilesystemPath, *Path, UserId, origDeviceOwner,
				{
					if (finally_arg2.SystemId != (uid_t) -1)
						Core->SetFileOwner (finally_arg, finally_arg2);
				});
#endif
				wxBusyCursor busy;
				ChangePasswordThreadRoutine routine(Path,	Gui->GetPreferences().DefaultMountOptions.PreserveTimestamps,
					CurrentPasswordPanel->GetPassword(), CurrentPasswordPanel->GetVolumePim(), CurrentPasswordPanel->GetPkcs5Kdf(), CurrentPasswordPanel->GetKeyfiles(),
					newPassword, newPim, newKeyfiles, NewPasswordPanel->GetPkcs5Kdf(), NewPasswordPanel->GetHeaderWipeCount(), Gui->GetPreferences().EMVSupportEnabled);
				Gui->ExecuteWaitThreadRoutine (this, &routine);
				masterKeyVulnerable = routine.m_masterKeyVulnerable;
			}

			switch (DialogMode)
			{
			case Mode::ChangePasswordAndKeyfiles:
				Gui->ShowInfo ("PASSWORD_CHANGED");
				break;

			case Mode::ChangeKeyfiles:
			case Mode::RemoveAllKeyfiles:
				Gui->ShowInfo ("KEYFILE_CHANGED");
				break;

			case Mode::ChangePkcs5Prf:
				Gui->ShowInfo ("PKCS5_PRF_CHANGED");
				break;

			default:
				throw ParameterIncorrect (SRC_POS);
			}

			if (masterKeyVulnerable)
				Gui->ShowWarning ("ERR_XTS_MASTERKEY_VULNERABLE");

			EndModal (wxID_OK);
		}
		catch (UnportablePassword &e)
		{
			Gui->ShowError (e);
			NewPasswordPanel->SetFocusToPasswordTextCtrl();
		}
		catch (PasswordException &e)
		{
			Gui->ShowWarning (e);
			CurrentPasswordPanel->SetFocusToPasswordTextCtrl();
		}
		catch (exception &e)
		{
			Gui->ShowError (e);
		}
	}

	void ChangePasswordDialog::OnPasswordPanelUpdate ()
	{
		bool ok = true;

		try
		{

			bool passwordEmpty = CurrentPasswordPanel->GetPassword()->IsEmpty();
			bool keyfilesEmpty = !CurrentPasswordPanel->GetKeyfiles() || CurrentPasswordPanel->GetKeyfiles()->empty();

			if (passwordEmpty && keyfilesEmpty)
				ok = false;

			if (CurrentPasswordPanel->GetVolumePim () == -1)
				ok = false;

			if (DialogMode == Mode::RemoveAllKeyfiles && (passwordEmpty || keyfilesEmpty))
				ok = false;

			if (DialogMode == Mode::ChangePasswordAndKeyfiles || DialogMode == Mode::ChangeKeyfiles)
			{
				bool newKeyfilesEmpty = !NewPasswordPanel->GetKeyfiles() || NewPasswordPanel->GetKeyfiles()->empty();

				if (DialogMode == Mode::ChangeKeyfiles
					&& ((passwordEmpty && newKeyfilesEmpty) || (keyfilesEmpty && newKeyfilesEmpty)))
					ok = false;

				if (DialogMode == Mode::ChangePasswordAndKeyfiles
					&& (	(NewPasswordPanel->GetPassword()->IsEmpty() && newKeyfilesEmpty)
						|| 	!NewPasswordPanel->PasswordsMatch()
						|| 	(NewPasswordPanel->GetVolumePim() == -1)
						)
					)
					ok = false;
			}
		}
		catch (PasswordException&)
		{
			ok = false;
		}

		OKButton->Enable (ok);

		if (DialogMode == Mode::ChangePasswordAndKeyfiles)
		{
			bool pimChanged = (CurrentPasswordPanel->GetVolumePim() != NewPasswordPanel->GetVolumePim());
			NewPasswordPanel->UpdatePimHelpText(pimChanged);
		}

	}
}