/***************************************************************************
                             kmymoneywizard_p.h
                             -------------------
    copyright            : (C) 2006 by Thomas Baumagrt
    email                : ipwizard@users.sourceforge.net
                           (C) 2017 by Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com>
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef KMYMONEYWIZARD_P_H
#define KMYMONEYWIZARD_P_H

#include "kmymoneywizard.h"

// ----------------------------------------------------------------------------
// QT Includes

#include <QLabel>
#include <QFont>
#include <QHBoxLayout>
#include <QList>
#include <QVBoxLayout>
#include <QPushButton>
#include <QIcon>
#include <QStyle>

// ----------------------------------------------------------------------------
// KDE Includes

#include <KLocalizedString>
#include <KStandardGuiItem>
#include <KColorScheme>

// ----------------------------------------------------------------------------
// Project Includes

#include "kmymoneywizardpage.h"
#include "kmymoneywizardpage_p.h"
#include "kmymoneytitlelabel.h"
#include "icons/icons.h"

using namespace Icons;

class KMyMoneyWizardPrivate
{
  Q_DISABLE_COPY(KMyMoneyWizardPrivate)
  Q_DECLARE_PUBLIC(KMyMoneyWizard)

public:
  explicit KMyMoneyWizardPrivate(KMyMoneyWizard *qq) :
    q_ptr(qq),
    m_cancelButton(nullptr),
    m_backButton(nullptr),
    m_nextButton(nullptr),
    m_finishButton(nullptr),
    m_helpButton(nullptr),
    m_wizardLayout(nullptr),
    m_stepLayout(nullptr),
    m_pageLayout(nullptr),
    m_buttonLayout(nullptr),
    m_stepFrame(nullptr),
    m_stepLabel(nullptr),
    m_step(0),
    m_titleLabel(nullptr)
  {
  }

  virtual ~KMyMoneyWizardPrivate()
  {
  }

  void init(bool modal)
  {
    Q_Q(KMyMoneyWizard);
    q->setModal(modal);

    // enable the little grip in the right corner
    q->setSizeGripEnabled(true);

    // create buttons
    m_cancelButton = new QPushButton(i18n("&Cancel"), q);
    m_backButton = new QPushButton(i18nc("Go to previous page of the wizard", "&Back"), q);
    m_nextButton = new QPushButton(i18nc("Go to next page of the wizard", "&Next"), q);
    m_finishButton = new QPushButton(i18nc("Finish the wizard", "&Finish"), q);
    m_helpButton = new QPushButton(i18n("&Help"), q);

    if (q->style()->styleHint(QStyle::SH_DialogButtonBox_ButtonsHaveIcons, 0, q)) {
        m_backButton->setIcon(KStandardGuiItem::back(KStandardGuiItem::UseRTL).icon());
        m_nextButton->setIcon(KStandardGuiItem::forward(KStandardGuiItem::UseRTL).icon());
        m_finishButton->setIcon(Icons::get(Icon::DialogOKApply));
        m_cancelButton->setIcon(Icons::get(Icon::DialogCancel));
        m_helpButton->setIcon(Icons::get(Icon::Help));
      }

    // create button layout
    m_buttonLayout = new QHBoxLayout;
    m_buttonLayout->addWidget(m_helpButton);
    m_buttonLayout->addStretch(1);
    m_buttonLayout->addWidget(m_backButton);
    m_buttonLayout->addWidget(m_nextButton);
    m_buttonLayout->addWidget(m_finishButton);
    m_buttonLayout->addWidget(m_cancelButton);

    // create wizard layout
    m_wizardLayout = new QVBoxLayout(q);
    m_wizardLayout->setContentsMargins(6, 6, 6, 6);
    m_wizardLayout->setSpacing(0);
    m_wizardLayout->setObjectName("wizardLayout");
    m_titleLabel = new KMyMoneyTitleLabel(q);
    m_titleLabel->setObjectName("titleLabel");
    m_wizardLayout->addWidget(m_titleLabel);

    QHBoxLayout* hboxLayout = new QHBoxLayout;
    hboxLayout->setContentsMargins(0, 0, 0, 0);
    hboxLayout->setSpacing(6);
    hboxLayout->setObjectName("hboxLayout");

    // create stage layout and frame
    m_stepFrame = new QFrame(q);
    m_stepFrame->setObjectName("stepFrame");
    QPalette palette = m_stepFrame->palette();
    palette.setColor(m_stepFrame->backgroundRole(), KColorScheme::NormalText);
    m_stepFrame->setPalette(palette);
    m_stepLayout = new QVBoxLayout(m_stepFrame);
    m_stepLayout->setContentsMargins(11, 11, 11, 11);
    m_stepLayout->setSpacing(6);
    m_stepLayout->setObjectName("stepLayout");
    m_stepLayout->addWidget(new QLabel(QString(), m_stepFrame));
    m_stepLayout->addItem(new QSpacerItem(20, 20, QSizePolicy::Minimum, QSizePolicy::Expanding));
    m_stepLabel = new QLabel(m_stepFrame);
    m_stepLabel->setAlignment(Qt::AlignHCenter);
    m_stepLayout->addWidget(m_stepLabel);
    hboxLayout->addWidget(m_stepFrame);

    m_stepPalette = m_stepLabel->palette();

    // add a vertical line between the stepFrame and the pages
    QFrame* line = new QFrame(q);
    line->setObjectName("line");
    line->setFrameShadow(QFrame::Sunken);
    line->setFrameShape(QFrame::VLine);
    hboxLayout->addWidget(line);

    // create page layout
    m_pageLayout = new QVBoxLayout;
    m_pageLayout->setContentsMargins(0, 0, 0, 0);
    m_pageLayout->setSpacing(6);
    m_pageLayout->setObjectName("pageLayout");

    // the page will be inserted later dynamically above q line
    line = new QFrame(q);
    line->setObjectName("line");
    line->setFrameShadow(QFrame::Sunken);
    line->setFrameShape(QFrame::HLine);
    m_pageLayout->addWidget(line);
    m_pageLayout->addLayout(m_buttonLayout);

    // now glue everything together
    hboxLayout->addLayout(m_pageLayout);
    m_wizardLayout->addLayout(hboxLayout);

    q->resize(QSize(670, 550).expandedTo(q->minimumSizeHint()));

    m_titleLabel->setText(i18n("No Title specified"));
    m_titleLabel->setRightImageFile("pics/titlelabel_background.png");

    m_finishButton->hide();

    q->connect(m_backButton, &QAbstractButton::clicked, q, &KMyMoneyWizard::backButtonClicked);
    q->connect(m_nextButton, &QAbstractButton::clicked, q, &KMyMoneyWizard::nextButtonClicked);
    q->connect(m_cancelButton, &QAbstractButton::clicked, q, &QDialog::reject);
    q->connect(m_finishButton, &QAbstractButton::clicked, q, &KMyMoneyWizard::accept);
    q->connect(m_helpButton, &QAbstractButton::clicked, q, &KMyMoneyWizard::helpButtonClicked);
  }

  /**
    * Switch to page which is currently the top of the history stack.
    * @p oldPage is a pointer to the current page or 0 if no page
    * is shown.
    *
    * @param oldPage pointer to currently displayed page
    */
  void switchPage(KMyMoneyWizardPage* oldPage)
  {
    Q_Q(KMyMoneyWizard);
    if (oldPage) {
        oldPage->widget()->hide();
        m_pageLayout->removeWidget(oldPage->widget());
        q->disconnect(oldPage->object(), SIGNAL(completeStateChanged()), q, SLOT(completeStateChanged()));
      }
    KMyMoneyWizardPage* newPage = m_history.back();
    if (newPage) {
        m_pageLayout->insertWidget(0, newPage->widget());
        q->connect(newPage->object(), SIGNAL(completeStateChanged()), q, SLOT(completeStateChanged()));
        newPage->widget()->show();
        selectStep(newPage->step());
        if (newPage->isLastPage()) {
            m_nextButton->setDefault(false);
            m_finishButton->setDefault(true);
          } else {
            m_finishButton->setDefault(false);
            m_nextButton->setDefault(true);
          }
        QWidget* w = newPage->initialFocusWidget();
        if (w)
          w->setFocus();
      }
    q->completeStateChanged();
  }

  /**
    * This method selects the step given by @p step.
    *
    * @param step step to be selected
    */
  void selectStep(int step)
  {
    if ((step < 1) || (step > m_steps.count()))
      return;

    m_step = step;
    QList<QLabel*>::iterator it_l;
    QFont f = m_steps[0]->font();
    for (it_l = m_steps.begin(); it_l != m_steps.end(); ++it_l) {
        f.setBold(false);
        (*it_l)->setFrameStyle(QFrame::NoFrame);
        if (--step == 0) {
            f.setBold(true);
            (*it_l)->setFrameStyle(QFrame::Box | QFrame::Sunken);
          }
        (*it_l)->setFont(f);
      }
    updateStepCount();
  }

  /**
    * This method sets up the first page after creation of the object
    *
    * @param page pointer to first page of wizard
    */
  void setFirstPage(KMyMoneyWizardPage* page)
  {
    page->resetPage();
    m_history.clear();
    m_history.append(page);
    switchPage(0);
  }

  /**
    * This method allows to hide or show a @p step.
    *
    * @param step step to be shown/hidden
    * @param hidden hide step if true (the default) or show it if false
    */
  void setStepHidden(int step, bool hidden = true)
  {
    if ((step < 1) || (step > m_steps.count()))
      return;

    m_steps[--step]->setHidden(hidden);
    updateStepCount();
  }

  void updateStepCount()
  {
    QList<QLabel*>::iterator it_l;
    int stepCount = 0;
    int hiddenAdjust = 0;
    int step = 0;
    for (it_l = m_steps.begin(); it_l != m_steps.end(); ++it_l) {
      if (!(*it_l)->isHidden())
        ++stepCount;
      else if (step < m_step)
        hiddenAdjust++;
      ++step;
    }
    m_stepLabel->setText(i18n("Step %1 of %2", (m_step - hiddenAdjust), stepCount));
  }

  KMyMoneyWizard       *q_ptr;

  /*
   * The buttons
   */
  QPushButton*          m_cancelButton;
  QPushButton*          m_backButton;
  QPushButton*          m_nextButton;
  QPushButton*          m_finishButton;
  QPushButton*          m_helpButton;

  /*
   * The layouts
   */
  QVBoxLayout*          m_wizardLayout;
  QVBoxLayout*          m_stepLayout;
  QVBoxLayout*          m_pageLayout;
  QHBoxLayout*          m_buttonLayout;

  /*
   * Some misc. widgets required
   */
  QFrame*               m_stepFrame;
  QLabel*               m_stepLabel;
  QPalette              m_stepPalette;

  QList<QLabel*>        m_steps;      // the list of step labels
  int                   m_step;       // the currently selected step

  /*
   * The title bar
   */
  KMyMoneyTitleLabel*   m_titleLabel;

  /*
   * The history stack
   */
  QList<KMyMoneyWizardPage*> m_history;

  QString               m_helpContext;
};

#endif
