/*
 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
{
	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;
		bool isTrueCryptFile = false;
		
		if (volumePath && volumePath->HasTrueCryptExtension ())
		{
			isTrueCryptFile = true;
		}

		switch (mode)
		{
		case Mode::ChangePasswordAndKeyfiles:
			enableNewPassword = true;
			enableNewKeyfiles = true;
			enablePkcs5Prf = true;
			SetTitle (_("Change Volume Password and Keyfiles"));
			break;

		case Mode::ChangeKeyfiles:
			enableNewKeyfiles = true;
			SetTitle (_("Add/Remove Keyfiles to/from Volume"));
			break;

		case Mode::RemoveAllKeyfiles:
			SetTitle (_("Remove All Keyfiles from Volume"));
			break;

		case Mode::ChangePkcs5Prf:
			enablePkcs5Prf = true;
			SetTitle (_("Change Header Key Derivation Algorithm"));
			break;

		default:
			throw ParameterIncorrect (SRC_POS);
		}

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

		NewPasswordPanel = new VolumePasswordPanel (this, NULL, newPassword, true, 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
		{
			bool bUnsupportedKdf = false;
			shared_ptr <Pkcs5Kdf> currentKdf = CurrentPasswordPanel->GetPkcs5Kdf(bUnsupportedKdf);
			if (bUnsupportedKdf)
			{
				Gui->ShowWarning (LangString ["ALGO_NOT_SUPPORTED_FOR_TRUECRYPT_MODE"]);
				return;
			}
			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(bUnsupportedKdf) ? NewPasswordPanel->GetPkcs5Kdf(bUnsupportedKdf)->GetHash() : shared_ptr <Hash>());

			{
#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(bUnsupportedKdf), CurrentPasswordPanel->GetTrueCryptMode(),CurrentPasswordPanel->GetKeyfiles(),
					newPassword, newPim, newKeyfiles, NewPasswordPanel->GetPkcs5Kdf(bUnsupportedKdf), NewPasswordPanel->GetHeaderWipeCount());
				Gui->ExecuteWaitThreadRoutine (this, &routine);
			}

			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);
			}

			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);
		}

	}
}
