#include "track_resize_handler.h"
#include "track_entry.h"
#include "track_widget.h"
#include "track_content_widget.h"
#include "filter_track_widget.h"
#include "filter_background_widget.h"

#include "tools.h"

#include <LtsWidgets/lts_message_dialog.h>

#include <QMouseEvent>
#include <QDebug>


namespace LtsScriptTimeline
{
void ResizeHandler::mousePressEvent(QMouseEvent *event)
{
  if (event->buttons() != Qt::LeftButton || !m_possible)
    return;

  TrackEntry *te = m_trackContentWidget->getTrackEntryOnPos(event->globalPos());

  if (te == nullptr)
    return;

  m_oldLength = te->m_length;
  m_resizing = true; 
}


void ResizeHandler::mouseReleaseEvent(QMouseEvent *)
{
  m_resizing = false;

  if (!m_trackContentWidget->m_mainSelected)
    return;

  QVector<TrackEntry *> vecPreviewTrackEntries = {m_trackContentWidget->m_mainSelected};

  bool msg = true;
  for (TrackContentWidget *tcw : qAsConst(m_tcwCorresponding))
  {
    if (TrackContentWidget::checkForParallelTopics(tcw, vecPreviewTrackEntries, m_trackContentWidget->m_mainSelected->m_startTime))
    {
      if (msg)
      {
        LtsWidgets::LtsMessageDialog::showMessage(m_trackContentWidget, TrackContentWidget::parallelError(), QObject::tr("Error"));
        msg = false;
      }
      m_trackContentWidget->m_mainSelected->m_length = m_oldLength;
    }
  }
}


bool ResizeHandler::isCollision(int newLength) const
{
  int startTime = m_trackContentWidget->m_mainSelected->m_startTime;
  int endTime = startTime + newLength;

  
  for (auto i = m_trackContentWidget->m_entryList.constBegin(); i != m_trackContentWidget->m_entryList.constEnd(); ++i)
  {
    const TrackEntry *trackEntry = *i;

    if (!trackEntry || trackEntry == m_trackContentWidget->m_mainSelected) 
      continue;

    if (LtsScriptTimeline::isCollision2(startTime, endTime, trackEntry))
      return true;
  }

  
  const QVector<FilterTrackWidget *> &filterTrackWidgets = m_trackContentWidget->trackWidget()->filterLines();
  for (const FilterTrackWidget *filterTrackWidget : qAsConst(filterTrackWidgets))
  {
    for (auto iFilterContentWidget = filterTrackWidget->fbw()->filterContentWidgets().begin(); iFilterContentWidget != filterTrackWidget->fbw()->filterContentWidgets().end(); ++iFilterContentWidget)
    {
      int filterContentWidgetTopicId = iFilterContentWidget.key();
      if (m_trackContentWidget->m_mainSelected->m_topicId != filterContentWidgetTopicId) 
        continue;

      TrackContentWidget *filterContentWidget = iFilterContentWidget.value();
      for (auto iTrackEntry = filterContentWidget->m_entryList.constBegin(); iTrackEntry != filterContentWidget->m_entryList.end(); ++iTrackEntry)
      {
        const TrackEntry *trackEntry = *iTrackEntry;

        if (!trackEntry || trackEntry == m_trackContentWidget->m_mainSelected) 
          continue;

        if (endTime < startTime + trackEntry->m_startTime + trackEntry->m_length)
          return true;
      }
    }
  }

  return false;
}


bool ResizeHandler::mouseMoveEvent(QMouseEvent *event) 
{
  QPoint pos = m_trackContentWidget->mapFromGlobal(event->globalPos());
  int posX = pos.x();
  int cursorTime = m_trackContentWidget->m_tools->getTime(posX, m_trackContentWidget->m_isFilter);

  if (m_resizing && m_trackContentWidget->m_mainSelected) 
  {
    int newLength = cursorTime - m_trackContentWidget->m_mainSelected->m_startTime;
    int cursorY = pos.y();

    if (cursorY < 0 || cursorY > m_trackContentWidget->height() || newLength < 1 || (m_mainTeLength != -1 && newLength > m_mainTeLength) || isCollision(newLength))
    {
      newLength = m_oldLength;
      m_trackContentWidget->setCursor(Qt::ForbiddenCursor);
    }
    else
    {
      m_trackContentWidget->setCursor(m_cursor); 
    }

    m_trackContentWidget->m_mainSelected->m_length = newLength;
    m_trackContentWidget->update();
    emit m_trackContentWidget->signalChangesMade();
    return true;
  }
  else 
  {
    TrackEntry *te = m_trackContentWidget->getTrackEntryOnPos(event->globalPos());

    if (m_trackContentWidget->m_isFilter) 
    {
      TrackEntry *mainTe = m_trackContentWidget->getParentTopicOfFilter(te);

      if (mainTe != nullptr)
        m_mainTeLength = mainTe->m_length;
      else
        m_mainTeLength = -1;
    }


    if (te && (te->m_type == LtsScriptTimeline::TrackEntryType::Audio ||
               te->m_type == LtsScriptTimeline::TrackEntryType::Video))
    {
      m_possible = false;
      m_trackContentWidget->setCursor(m_cursor = Qt::ArrowCursor);
      m_trackContentWidget->update();
    }
    else if (te && m_trackContentWidget->m_mainSelected && te == m_trackContentWidget->m_mainSelected && m_trackContentWidget->m_selected.count() == 1
             && (cursorTime >= (m_trackContentWidget->m_mainSelected->m_startTime + m_trackContentWidget->m_mainSelected->m_length - 4)
                 && cursorTime <= (m_trackContentWidget->m_mainSelected->m_startTime + m_trackContentWidget->m_mainSelected->m_length)))
    {
      m_possible = true;
      m_trackContentWidget->setCursor(m_cursor = Qt::SizeHorCursor);
      m_trackContentWidget->update();
    }
    else if (!m_resizing) 
    {
      m_possible = false;
      m_trackContentWidget->setCursor(m_cursor = Qt::ArrowCursor);
      m_trackContentWidget->update();
    }
  }

  return false;
}


void ResizeHandler::keyPressEvent(QKeyEvent *event)
{
  if (m_trackContentWidget->m_mainSelected && event->key() == Qt::Key_Escape && m_resizing) 
  {
    m_trackContentWidget->m_mainSelected->m_length = m_oldLength;
    m_resizing = false;
    m_possible = false; 
    m_trackContentWidget->setCursor(Qt::ArrowCursor);
    m_trackContentWidget->update();
  }
}
}