/**
  * @RDE_HEADER@
  * Helper Classes to manage requirements for end-users to ui elements
  * $Id$
  * $HeadURL$
  * $Author$
  *
  * Created by Mike Wille, SLSE, 2016-08-19
  */

#include "ui_requirement.h"

#include <LtsWidgets/lts_message_dialog.h>

#include <QApplication>
#include <QLabel>


namespace LtsWidgets
{
UiRequirement::UiRequirement(QLabel *descriptionLabel, const std::function<bool()> &requirementCheck, const QString &userWarningMessage)
  : m_descriptionLabel(descriptionLabel)
  , m_requirementCheck(requirementCheck)
  , m_lastResult(true)
  , m_userWarningMessage(userWarningMessage)
{
  retranslate();
}


void UiRequirement::reset()
{
  if (!isValid())
    return;
  m_descriptionLabel->setText(m_originalText);
  m_descriptionLabel->setToolTip(m_originalTooltip);
}


void UiRequirement::setTexts()
{
  if (!isValid())
    return;
  if (!m_lastResult) // requirement not met? change text color but only if this is NOT a simulation!
  {
    m_descriptionLabel->setText(QStringLiteral("<span style=\"color:#aa0000;\">\u2022 %1</span>").arg(m_originalText)); // add requirement-indicator unicode 'bullet'

    if (!m_userWarningMessage.isEmpty())
    {
      m_descriptionLabel->setCursor(Qt::WhatsThisCursor);
      m_descriptionLabel->setToolTip(m_userWarningMessage);
    }
  }
  else
  {
    if (m_originalText.startsWith(QStringLiteral("\u2022 ")))
      return;

    m_descriptionLabel->setText(QStringLiteral("\u2022 %1").arg(m_originalText)); // set back to original text, as the requirement is now met and add requirement-indicator unicode 'bullet'
    m_descriptionLabel->setCursor(Qt::ArrowCursor);
    m_descriptionLabel->setToolTip(m_originalTooltip);
  }
}


void UiRequirement::retranslate()
{
  if (!isValid())
    return;

  if (m_originalText.startsWith(QStringLiteral("\u2022 ")))
    return;

  auto x = m_descriptionLabel->text();
  if (x.startsWith(QStringLiteral("\u2022 ")))
    return;

  m_originalText = x;

  m_originalTooltip = m_descriptionLabel->toolTip();
  setTexts();
}


bool UiRequirement::checkRequirement()
{
  if (!isValid())
    return m_lastResult;

  m_lastResult = m_requirementCheck();

  if (!m_descriptionLabel->isVisible() && !m_descriptionLabel->property("checkMe").toBool()) // do not check when label is not visible (on some cases there are elemts which must not be used, so they are hidden and therefor not a requirement, and therefor "a met requirement")
  {
    return true;
  }

  setTexts();

  return m_lastResult;
}


bool UiRequirementList::checkRequirements(QWidget *messageOnThisParent)
{
  bool result = true; // as long no requirement failed (even if there are none), the result is positive
  for (auto i = m_requirementList.begin(); i != m_requirementList.end(); ++i)
  {
    UiRequirement &r = (*i);

    // Todo: Delete from Vector!
    if (!r.isValid())
      continue;

    if (!r.checkRequirement()) // requirement failed, so all requirements failed, but keep on checking the requirements (to show the user what exactly is wrong)
    {
      result = false; // to NOT break here, checkRequirement() marks all important errors, so it must be called, even if result was already set to false
    }
  }

  if (!result && messageOnThisParent) // show a message that one or more requirements are not met, but only when a pointer has been given to put the LtsMessageDialog on
  {
    LtsWidgets::LtsMessageDialog::showMessage(messageOnThisParent,
                                              QApplication::translate("LtsWidgets::LtsDialog",
                                                                      "There are elements that have invalid or no value.<br>"
                                                                      "Please change values in the elements which are marked with red text."),
                                              QApplication::translate("LtsWidgets::LtsDialog", "Operation not complete"));
  }

  return result;
}


void UiRequirementList::addRequirement(const UiRequirement &uiRequirement)
{
  m_requirementList.append(uiRequirement);
}


void UiRequirementList::clear()
{
  for (auto i = m_requirementList.begin(); i != m_requirementList.end(); ++i)
  {
    UiRequirement &uir = *i;
    uir.reset();
  }

  m_requirementList.clear();
}


void UiRequirementList::retranslate()
{
  for (auto i = m_requirementList.begin(); i != m_requirementList.end(); ++i)
  {
    UiRequirement &r = (*i);

    r.retranslate();
  }
}
} // namespace LtsWidgets