/*****************************************************************************
 *   Copyright (C) 2022 by Friedrich Schriewer <friedrich.schriewer@gmx.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.                                     *
 *                                                                           *
 *   This program is distributed in the hope that it will be useful,         *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of          *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           *
 *   GNU General Public License for more details.                            *
 *                                                                           *
 *   You should have received a copy of the GNU General Public License       *
 *   along with this program; if not, write to the                           *
 *   Free Software Foundation, Inc.,                                         *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA .          *
 ****************************************************************************/
import QtQuick 2.12

import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.components 2.0 as PlasmaComponents
import org.kde.plasma.extras 2.0 as PlasmaExtras
import org.kde.kquickcontrolsaddons 2.0

import org.kde.draganddrop 2.0

FocusScope {
  id: navGrid

  signal keyNavUp
  signal keyNavDown

  property alias triggerModel: listView.model
  property alias count: listView.count
  property alias currentIndex: listView.currentIndex
  property alias currentItem: listView.currentItem
  property alias contentItem: listView.contentItem

  property int subIndex: 0

  onFocusChanged: {
      if (!focus) {
          currentIndex = -1;
      }
  }
  function setFocus() {
    currentIndex = 0
    focus = true
    runnerList.currentMainIndex = currentIndex
  }
  function setFocusLast() {
    if (count > 0) {
      currentIndex = count - 1
      focus = true
      runnerList.currentMainIndex = currentIndex
    } else {
      setFocus()
    }
  }

  Component {
    id: genericItem
    GenericItem {
      x: 20
      canNavigate: true
      canDrag: false
      triggerModel: listView.model
      subIndex: navGrid.subIndex
    }
  }

  PlasmaExtras.ScrollArea {
    id: scrollArea

    anchors.fill: parent
    focus: true

    ListView {
      id: listView
      currentIndex: -1
      focus: true
      keyNavigationEnabled: true
      highlightFollowsCurrentItem: true
      highlightMoveDuration: 0

      delegate: genericItem

      onCurrentIndexChanged: {
        if (currentIndex != -1) {
          focus = true;
        }
      }
      onModelChanged: {
        currentIndex = -1;
      }
      onFocusChanged: {
        if (!focus) {
          currentIndex = -1
        }
      }
      Keys.onUpPressed: {
        if (runnerList.currentSubIndex != subIndex) {
          repeater.itemAt(runnerList.currentSubIndex).nGrid.currentIndex = -1
        }
        if (currentIndex > 0) {
          event.accepted = true;
          currentIndex = currentIndex - 1
          runnerList.currentMainIndex = currentIndex
          runnerList.currentSubIndex = subIndex
          positionViewAtIndex(currentIndex, ListView.Contain);
        } else {
          navGrid.keyNavUp();
        }
      }
      Keys.onDownPressed: {
        if (runnerList.currentSubIndex != subIndex) {
          repeater.itemAt(runnerList.currentSubIndex).nGrid.currentIndex = -1
        }
        if (currentIndex < count - 1) {
          event.accepted = true;
          currentIndex = currentIndex + 1;
          runnerList.currentMainIndex = currentIndex
          runnerList.currentSubIndex = subIndex
          positionViewAtIndex(currentIndex, ListView.Contain);
        } else {
          navGrid.keyNavDown();
        }
      }
      Keys.onPressed: {
        if (event.key == Qt.Key_Enter || event.key == Qt.Key_Return) {
          event.accepted = true;
          if (currentItem){
            currentItem.trigger()
          }
        }
      }
    }
  }
}