#include "selectable_table_view.h"
#include <algorithm>

namespace Calculation {

CalculationSelectableTableView::CalculationSelectableTableView(Responder * parentResponder, TableViewDataSource * dataSource,
 SelectableTableViewDataSource * selectionDataSource, SelectableTableViewDelegate * delegate) :
  ::SelectableTableView(parentResponder, dataSource, selectionDataSource, delegate)
{
  setVerticalCellOverlap(0);
  setMargins(0);
  setDecoratorType(ScrollView::Decorator::Type::None);
}

void CalculationSelectableTableView::scrollToBottom() {
  KDCoordinate contentOffsetX = contentOffset().x();
  KDCoordinate contentOffsetY = dataSource()->cumulatedHeightFromIndex(dataSource()->numberOfRows()) - maxContentHeightDisplayableWithoutScrolling();
  setContentOffset(KDPoint(contentOffsetX, contentOffsetY));
}

void CalculationSelectableTableView::scrollToCell(int i, int j) {
  if (m_contentView.bounds().height() < bounds().height()) {
    setTopMargin(bounds().height() - m_contentView.bounds().height());
  } else {
    setTopMargin(0);
  }
  ::SelectableTableView::scrollToCell(i, j);
  ScrollView::layoutSubviews();
  if (m_contentView.bounds().height() - contentOffset().y() < bounds().height()) {
    // Avoid empty space at the end of the table
    scrollToBottom();
  }
}

void CalculationSelectableTableView::scrollToSubviewOfTypeOfCellAtLocation(HistoryViewCellDataSource::SubviewType subviewType, int i, int j) {
  if (dataSource()->rowHeight(j) <= bounds().height()) {
    return;
  }
  /* As we scroll, the selected calculation does not use the same history view
   * cell, thus, we want to deselect the previous used history view cell. (*) */
  unhighlightSelectedCell();

  /* Main part of the scroll */
  HistoryViewCell * cell = static_cast<HistoryViewCell *>(selectedCell());
  assert(cell);
  KDCoordinate contentOffsetX = contentOffset().x();
  KDCoordinate contentOffsetY = dataSource()->cumulatedHeightFromIndex(j+1) - maxContentHeightDisplayableWithoutScrolling();
  if (subviewType == HistoryViewCellDataSource::SubviewType::Input) {
    if (j == 0) {
      contentOffsetY = 0;
    } else {
      contentOffsetY = dataSource()->cumulatedHeightFromIndex(j);
    }
  } else if (cell->displaysSingleLine() && dataSource()->rowHeight(j) > maxContentHeightDisplayableWithoutScrolling()) {
    /* If we cannot display the full calculation, we display the output as
     * close as possible to the top of the screen without drawing empty space
     * between the history and the input field. */
    contentOffsetY = dataSource()->cumulatedHeightFromIndex(j) + std::min(dataSource()->rowHeight(j) - maxContentHeightDisplayableWithoutScrolling(), cell->inputView()->layout().baseline() - cell->outputView()->baseline());
  }
  setContentOffset(KDPoint(contentOffsetX, contentOffsetY));
  /* For the same reason as (*), we have to rehighlight the new history view
   * cell and reselect the first responder.
   * We have to recall "selectedCell" because when the table might have been
   * relayouted in "setContentOffset".*/
  cell = static_cast<HistoryViewCell *>(selectedCell());
  assert(cell);
  cell->setHighlighted(true);
  Container::activeApp()->setFirstResponder(cell);
}


}