/*
 * Copyright 2008-2010, Haiku, Inc. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *              Michael Pfeiffer <laplace@users.sourceforge.net>
 */


#include "WizardController.h"

#include "WizardView.h"
#include "WizardPageView.h"


void
WizardController::StateStack::MakeEmpty()
{
        StateStack* stack = this;
        StateStack* next;
        do {
                next = stack->Next();
                delete stack;
                stack = next;
        } while (next != NULL);
}


WizardController::WizardController()
        :
        fStack(NULL)
{
}


WizardController::~WizardController()
{
        if (fStack != NULL) {
                fStack->MakeEmpty();
                fStack = NULL;
        }
}


void
WizardController::Initialize(WizardView* view)
{
        if (fStack == NULL)
                _PushState(InitialState());
        _ShowPage(view);
}


void
WizardController::Next(WizardView* wizard)
{
        wizard->PageCompleted();

        if (fStack == NULL)
                return;

        int state = NextState(fStack->State());
        if (state < 0)
                return;

        _PushState(state);
        _ShowPage(wizard);
}


void
WizardController::Previous(WizardView* wizard)
{
        wizard->PageCompleted();

        if (fStack != NULL) {
                StateStack* stack = fStack;
                fStack = fStack->Next();
                delete stack;
        }
        _ShowPage(wizard);
}


int32
WizardController::CurrentState() const
{
        if (fStack == NULL)
                return -1;

        return fStack->State();
}


void
WizardController::_PushState(int32 state)
{
        fStack = new StateStack(state, fStack);
}


void
WizardController::_ShowPage(WizardView* wizard)
{
        if (fStack == NULL)
                return;

        WizardPageView* page = CreatePage(fStack->State(), wizard);
        wizard->SetPage(page);
}