/*
 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/GraphicUserInterface.h"
#include "Main/Resources.h"
#include "WizardFrame.h"

namespace VeraCrypt
{
	WizardFrame::WizardFrame (wxWindow* parent)
		: WizardFrameBase (parent),
		CurrentPage (nullptr),
		CurrentStep (-1),
		MaxStaticTextWidth (-1),
		WorkInProgress (false)
	{
		SetIcon (Resources::GetVeraCryptIcon());

		PageTitleStaticText->SetFont (wxFont (
#ifdef TC_WINDOWS
			16
#elif defined(TC_MACOSX)
			18
#elif defined(__WXGTK__)
			14
#endif
			* Gui->GetCharHeight (this) / 13, wxFONTFAMILY_DEFAULT, wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL, false, L"Times New Roman"));

		UpdateControls();
		this->SetDefaultItem (NextButton);
		NextButton->SetFocus();

		foreach (wxWindow *c, MainPanel->GetChildren())
			c->Connect (wxEVT_MOTION, wxMouseEventHandler (WizardFrame::OnMouseMotion), nullptr, this);
	}

	WizardFrame::~WizardFrame ()
	{
		if (CurrentPage)
			CurrentPage->Destroy();
	}

	void WizardFrame::ClearHistory ()
	{
		StepHistory.clear();
		UpdateControls();
	}

	void WizardFrame::OnActivate (wxActivateEvent& event)
	{
		Gui->SetActiveFrame (this);
		event.Skip();
	}

	void WizardFrame::OnClose (wxCloseEvent& event)
	{
		if (WorkInProgress)
			return;

		Gui->SetActiveFrame (nullptr);
		event.Skip();
	}

	void WizardFrame::OnHelpButtonClick (wxCommandEvent& event)
	{
		Gui->OpenUserGuide (this);
	}

	void WizardFrame::OnNextButtonClick (wxCommandEvent& event)
	{
		if (CurrentPage->IsValid())
		{
			WizardStep nextStep = ProcessPageChangeRequest (true);
			if (nextStep != CurrentStep)
				SetStep (nextStep);
		}
	}

	void WizardFrame::OnPreviousButtonClick (wxCommandEvent& event)
	{
		ProcessPageChangeRequest (false);

		if (!StepHistory.empty())
		{
			WizardStep prevStep = *StepHistory.rbegin();
			StepHistory.pop_back();
			SetStep (prevStep, false);
		}
	}

	void WizardFrame::SetCancelButtonText (const wxString &text)
	{
		CancelButton->SetLabel (text.empty() ? wxString (_("Cancel")) : text);
	}

	void WizardFrame::SetImage (const wxBitmap &bitmap)
	{
		WizardBitmap->SetBitmap (bitmap);
	}

	void WizardFrame::SetMaxStaticTextWidth (size_t charCount)
	{
		MaxStaticTextWidth = Gui->GetCharWidth (this) * charCount;
	}

	void WizardFrame::SetStep (WizardStep newStep)
	{
		SetStep (newStep, true);
	}

	void WizardFrame::SetStep (WizardStep newStep, bool forward)
	{
		bool init = false;
		FreezeScope freeze (this);

#ifdef TC_WINDOWS
		HelpButton->Disable(); // Prevent Help button from getting default focus
		NextButton->Enable();
#endif
		if (CurrentPage)
		{
			if (forward)
				StepHistory.push_back (CurrentStep);

			CurrentPage->OnPageChanging (forward);
			CurrentPage->Destroy();
			CurrentPage = nullptr;
		}
		else
			init = true;

		CurrentStep = newStep;
		CurrentPage = GetPage (newStep);

		CurrentPage->PageUpdatedEvent.Connect (EventConnector <WizardFrame> (this, &WizardFrame::OnPageUpdated));

		CurrentPage->Connect (wxEVT_MOTION, wxMouseEventHandler (WizardFrame::OnMouseMotion), nullptr, this);
		foreach (wxWindow *c, CurrentPage->GetChildren())
			c->Connect (wxEVT_MOTION, wxMouseEventHandler (WizardFrame::OnMouseMotion), nullptr, this);

		if (MaxStaticTextWidth > 0)
			CurrentPage->SetMaxStaticTextWidth (MaxStaticTextWidth);

		PageTitleStaticText->SetLabel (CurrentPage->GetPageTitle());
		PageSizer->Add (CurrentPage, 1, wxALL | wxEXPAND);

		if (init)
		{
			Fit();
			Layout();
			Center();
		}
		else
			MainPanel->Layout();

		CurrentPage->SetFocus();

		wxString nextButtonText = CurrentPage->GetNextButtonText();
		if (nextButtonText.empty())
			NextButton->SetLabel (_("&Next >"));
		else
			NextButton->SetLabel (nextButtonText);

#ifdef TC_WINDOWS
		HelpButton->Enable();
#endif
		UpdateControls();
	}

	void WizardFrame::SetWorkInProgress (bool state)
	{
		WorkInProgress = state;
		UpdateControls();
	}

	void WizardFrame::UpdateControls ()
	{
		CancelButton->Enable (!WorkInProgress);
		HelpButton->Enable (!WorkInProgress);
		NextButton->Enable (!WorkInProgress && CurrentPage != nullptr && CurrentPage->IsValid());
		PreviousButton->Enable (!WorkInProgress && !StepHistory.empty());
	}
}