/***************************************************************************
                             kmymoneywizard.cpp
                             -------------------
    copyright            : (C) 2006 by Thomas Baumagrt
    email                : ipwizard@users.sourceforge.net
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#include "kmymoneywizard.h"
#include "kmymoneywizard_p.h"

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

#include <QLayout>
#include <QLabel>
#include <QFont>
#include <QToolTip>
#include <QHBoxLayout>
#include <QList>
#include <QVBoxLayout>

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

#include <klocale.h>
#include <kpushbutton.h>
#include <kglobalsettings.h>
#include <kiconloader.h>
#include <kapplication.h>
#include <KColorScheme>

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

#include "kmymoneytitlelabel.h"
#include "kguiutils.h"
#include "ktoolinvocation.h"

KMyMoneyWizardPagePrivate::KMyMoneyWizardPagePrivate(QObject* parent) :
    QObject(parent)
{
}

void KMyMoneyWizardPagePrivate::emitCompleteStateChanged()
{
  emit completeStateChanged();
}


KMyMoneyWizardPage::KMyMoneyWizardPage(unsigned int step, QWidget* widget) :
    m_step(step),
    m_widget(widget),
    d(new KMyMoneyWizardPagePrivate(widget))
{
  m_mandatoryGroup = new kMandatoryFieldGroup(widget);
  QObject::connect(m_mandatoryGroup, SIGNAL(stateChanged()), object(), SIGNAL(completeStateChanged()));
  widget->hide();
}

QObject* KMyMoneyWizardPage::object() const
{
  return d;
}

void KMyMoneyWizardPage::completeStateChanged() const
{
  d->emitCompleteStateChanged();
}

void KMyMoneyWizardPage::resetPage()
{
}

void KMyMoneyWizardPage::enterPage()
{
}

void KMyMoneyWizardPage::leavePage()
{
}

KMyMoneyWizardPage* KMyMoneyWizardPage::nextPage() const
{
  return 0;
}

bool KMyMoneyWizardPage::isLastPage() const
{
  return nextPage() == 0;
}

bool KMyMoneyWizardPage::isComplete() const
{
  if (!isLastPage())
    wizard()->m_nextButton->setToolTip(i18n("Continue with next page"));
  else
    wizard()->m_finishButton->setToolTip(i18n("Finish wizard"));
  return m_mandatoryGroup->isEnabled();
}

QString KMyMoneyWizardPage::helpContext() const
{
  return QString();
}

KMyMoneyWizard::KMyMoneyWizard(QWidget *parent, bool modal, Qt::WFlags f) :
    QDialog(parent, f),
    m_step(0)
{
  setModal(modal);

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

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

  if (KGlobalSettings::showIconsOnPushButtons()) {
    m_backButton->setIcon(KStandardGuiItem::back(KStandardGuiItem::UseRTL).icon());
    m_nextButton->setIcon(KStandardGuiItem::forward(KStandardGuiItem::UseRTL).icon());
    m_finishButton->setIcon(KIcon("dialog-ok-apply"));
    m_cancelButton->setIcon(KIcon("dialog-cancel"));
    m_helpButton->setIcon(KIcon("help-contents"));
  }

  // 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(this);
  m_wizardLayout->setContentsMargins(6, 6, 6, 6);
  m_wizardLayout->setSpacing(0);
  m_wizardLayout->setObjectName("wizardLayout");
  m_titleLabel = new KMyMoneyTitleLabel(this);
  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(this);
  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("", 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(this);
  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 this line
  line = new QFrame(this);
  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);

  resize(QSize(670, 550).expandedTo(minimumSizeHint()));

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

  m_finishButton->hide();

  connect(m_backButton, SIGNAL(clicked()), this, SLOT(backButtonClicked()));
  connect(m_nextButton, SIGNAL(clicked()), this, SLOT(nextButtonClicked()));
  connect(m_cancelButton, SIGNAL(clicked()), this, SLOT(reject()));
  connect(m_finishButton, SIGNAL(clicked()), this, SLOT(accept()));
  connect(m_helpButton, SIGNAL(clicked()), this, SLOT(helpButtonClicked()));
}

void KMyMoneyWizard::setTitle(const QString& txt)
{
  m_titleLabel->setText(txt);
}

void KMyMoneyWizard::addStep(const QString& text)
{
  QLabel* step = new QLabel(text, m_stepFrame);
  step->setFrameStyle(QFrame::Panel | QFrame::Raised);
  step->setAlignment(Qt::AlignHCenter);
  step->setFrameStyle(QFrame::Box | QFrame::Sunken);
  step->setMargin(2);
  step->setPalette(m_stepPalette);

  m_steps.append(step);
  m_stepLayout->insertWidget(m_steps.count(), step);

  QFont font(step->font());
  font.setBold(true);
  QFontMetrics fm(font);
  int w = fm.width(text) + 30;
  if (m_stepFrame->minimumWidth() < w) {
    m_stepFrame->setMinimumWidth(w);
  }
}

void KMyMoneyWizard::setStepHidden(int step, bool hidden)
{
  if ((step < 1) || (step > m_steps.count()))
    return;

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

void KMyMoneyWizard::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();
}

void KMyMoneyWizard::reselectStep()
{
  selectStep(m_step);
}

void KMyMoneyWizard::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));
}

void KMyMoneyWizard::setFirstPage(KMyMoneyWizardPage* page)
{
  page->resetPage();
  m_history.clear();
  m_history.append(page);
  switchPage(0);
}

void KMyMoneyWizard::switchPage(KMyMoneyWizardPage* oldPage)
{
  if (oldPage) {
    oldPage->widget()->hide();
    m_pageLayout->removeWidget(oldPage->widget());
    disconnect(oldPage->object(), SIGNAL(completeStateChanged()), this, SLOT(completeStateChanged()));
  }
  KMyMoneyWizardPage* newPage = m_history.back();
  if (newPage) {
    m_pageLayout->insertWidget(0, newPage->widget());
    connect(newPage->object(), SIGNAL(completeStateChanged()), this, 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();
  }
  completeStateChanged();
}

void KMyMoneyWizard::backButtonClicked()
{
  KMyMoneyWizardPage* oldPage = m_history.back();
  m_history.pop_back();
  oldPage->leavePage();
  oldPage->resetPage();
  switchPage(oldPage);
}

void KMyMoneyWizard::nextButtonClicked()
{
  // make sure it is really complete. Some widgets only change state during focusOutEvent,
  // so we just create such an animal by changing the focus to the next button and
  // check again for copmpleness
  m_nextButton->setFocus();
  KMyMoneyWizardPage* oldPage = m_history.back();
  if (oldPage->isComplete()) {
    KMyMoneyWizardPage* newPage = oldPage->nextPage();
    m_history.append(newPage);
    newPage->enterPage();
    newPage->resetPage();
    switchPage(oldPage);
  }
}

void KMyMoneyWizard::helpButtonClicked()
{
  KMyMoneyWizardPage* currentPage = m_history.back();
  QString ctx = currentPage->helpContext();
  if (ctx.isEmpty())
    ctx = m_helpContext;
  KToolInvocation::invokeHelp(ctx);
}

void KMyMoneyWizard::completeStateChanged()
{
  KMyMoneyWizardPage* currentPage = m_history.back();
  bool lastPage = currentPage->isLastPage();

  m_finishButton->setVisible(lastPage);
  m_nextButton->setVisible(!lastPage);

  KPushButton* button;

  button = lastPage ? m_finishButton : m_nextButton;

  bool rc = currentPage->isComplete();
  button->setEnabled(rc);

  m_backButton->setEnabled(m_history.count() > 1);
}

void KMyMoneyWizard::accept()
{
  // make sure it is really complete. Some widgets only change state during focusOutEvent,
  // so we just create such an animal by changing the focus to the finish button and
  // check again for completeness.
  m_finishButton->setFocus();
  KMyMoneyWizardPage* page = m_history.back();
  if (page->isComplete())
    QDialog::accept();
}
