package holeg.ui.view.inspector;

import holeg.interfaces.LocalMode;
import holeg.interfaces.TimelineDependent;
import holeg.model.HolonElement;
import holeg.model.HolonSwitch;
import holeg.preferences.ColorPreference;
import holeg.preferences.ImagePreference;
import holeg.ui.controller.Control;
import holeg.ui.model.GuiSettings;
import holeg.ui.view.image.Import;
import holeg.utility.listener.ResizeListener;
import holeg.utility.math.Maths;
import holeg.utility.math.decimal.Format;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ItemEvent;
import java.util.Set;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import javax.swing.Box;
import javax.swing.GrayFilter;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.JToolBar;

public class Inspector extends JSplitPane {

  private static final Logger log = Logger.getLogger(Inspector.class.getName());
  private final UnitGraph unitGraph;
  private final InspectorTable table;
  private final JPanel scrollGraph = new JPanel();
  private final JPanel graphLabel = new JPanel();
  private final JLabel maxGraph = new JLabel("100%");
  private final JLabel medGraph = new JLabel("50%");
  private final JLabel minGraph = new JLabel("0%");
  private final JPanel globalCurveLabel = new JPanel();
  private final JLabel minEnergy = new JLabel("0.0");
  private final JLabel maxEnergy = new JLabel("0.0");
  private final JLabel zeroEnergy = new JLabel("0.0");
  private final JToolBar toolBarGraph = new JToolBar();
  private final ImageIcon localPeriodButtonImageEnabled = new ImageIcon(
      Import.loadImage(ImagePreference.Button.Inspector.Graph));
  private final ImageIcon localPeriodButtonImageDisabled = new ImageIcon(
      GrayFilter.createDisabledImage(Import.loadImage(ImagePreference.Button.Inspector.Graph)));
  private String[] comboContext = {"", "5", "10", "20", "100", "1000"};
  private JComboBox<String> localPeriodInput = new JComboBox<String>(comboContext);
  private JButton resetButton = new JButton("",
      new ImageIcon(Import.loadImage(ImagePreference.Button.Inspector.Reset)));
  private JButton localPeriodButton = new JButton("", localPeriodButtonImageEnabled);

  public Inspector(Control control) {
    table = new InspectorTable(control);
    unitGraph = new UnitGraph(control);
    table.OnElementSelectionChanged.addListener(this::updateUnitGraph);
    initUI();
    control.OnSelectionChanged.addListener(this::updateGlobalCurve);
  }

  private void initUI() {
    this.setOrientation(JSplitPane.VERTICAL_SPLIT);
    JScrollPane scrollPane = new JScrollPane(table);
    scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
    this.setTopComponent(scrollPane);
    this.setBottomComponent(scrollGraph);
    this.setDividerLocation(550);
    scrollGraph.setLayout(new BorderLayout());
    scrollGraph.add(unitGraph, BorderLayout.CENTER);
    // Set up of the Properties section

    graphLabel.setLayout(new BorderLayout(0, 10));
    graphLabel.add(maxGraph, BorderLayout.NORTH);
    graphLabel.add(medGraph, BorderLayout.CENTER);
    graphLabel.add(minGraph, BorderLayout.SOUTH);

    globalCurveLabel.setLayout(null);
    globalCurveLabel.setMinimumSize(new Dimension(20, 0));
    globalCurveLabel.setPreferredSize(new Dimension(20, 0));
    maxEnergy.setForeground(Color.red);
    minEnergy.setForeground(Color.red);
    zeroEnergy.setForeground(ColorPreference.UnitGraph.ZeroLineColor);
    globalCurveLabel.add(maxEnergy);
    globalCurveLabel.add(zeroEnergy);
    globalCurveLabel.add(minEnergy);
    this.globalCurveLabel.addComponentListener((ResizeListener) resize -> updateGlobalCurve());

    toolBarGraph.setFloatable(false);
    toolBarGraph.setAlignmentY(Component.RIGHT_ALIGNMENT);

    localPeriodButton.setToolTipText("Toggle Local/Global Mode");
    toolBarGraph.add(localPeriodButton);
    // ComboBox
    localPeriodInput.setEditable(true);
    localPeriodInput.setVisible(false);
    localPeriodInput.setMaximumSize(new Dimension(20, 23));
    localPeriodInput.addItemListener(aListener -> {
      if (aListener.getStateChange() == ItemEvent.DESELECTED) {
        validateInput(localPeriodInput.getEditor().getItem().toString(), true);
      }

    });

    toolBarGraph.add(localPeriodInput);

    // localPeriodButtonFunction
    localPeriodButton.addActionListener(actionEvent -> {
      boolean newState = !localPeriodInput.isVisible();
      changeLocalPeriodButtonAppearance(newState);
      log.info("LocalPeriodButton");
    });

    toolBarGraph.add(Box.createHorizontalGlue());
    resetButton.setToolTipText("Reset");
    resetButton.addActionListener(actionEvent -> unitGraph.reset());
    toolBarGraph.add(resetButton);
    scrollGraph.add(graphLabel, BorderLayout.WEST);
    scrollGraph.add(globalCurveLabel, BorderLayout.EAST);
    scrollGraph.add(toolBarGraph, BorderLayout.NORTH);

  }

  /**
   * Validate the LocalMode Input and when its valid save on the Element.
   *
   * @param text         the inputText to validate.
   * @param bShowMessage when true, open a MessageDialog when text invalid.
   */
  private void validateInput(String text, boolean bShowMessage) {
    int localPeriodInputValue;
    try {
      localPeriodInputValue = Integer.parseInt(text);
    } catch (NumberFormatException e) {
      if (bShowMessage) {
        JOptionPane.showMessageDialog(null,
            '"' + text + '"' + " is not a valid Input. \n Use whole numbers.");
      }
      return;
    }
    LocalMode.Period period = new LocalMode.Period(7);
    period.setInterval(localPeriodInputValue);
    unitGraph.setPeriod(period);
  }

  /**
   * This Method updates the UnitGraph, saves the old LocalModeState and load the new
   * LocalModeState.
   *
   * @param elements The new Element to load the UnitGraph
   */
  private void updateUnitGraph(Set<HolonElement> elements) {
    // SaveOld LocalMode State.
    if (localPeriodInput.isVisible()) {
      // Save Old State
      validateInput(localPeriodInput.getEditor().getItem().toString(), false);
    }
    // Update UnitGraph
    unitGraph.clearSeries();
    for (TimelineDependent element : elements) {
      unitGraph.addNewSeries(element);
    }

    if (elements.isEmpty()) {
      GuiSettings.getSelectedObjects().stream().filter(obj -> obj instanceof HolonSwitch)
          .forEach(obj -> unitGraph.addNewSeries((HolonSwitch) obj));
    }

//		if (elements.isEmpty()) {
//			this.setDividerLocation(1.0);
//		}
    // Load LocalMode State.
    changeLocalPeriodButtonAppearance(unitGraph.isUsingLocalPeriod());
    localPeriodInput.getEditor()
        .setItem(
            unitGraph.isLocalPeriedDifferentInSeries() ? "-" : unitGraph.getFirstLocalPeriod());
  }

  private void updateGlobalCurve() {
    Set<HolonElement> elements = InspectorTable.extractElements(GuiSettings.getSelectedObjects())
        .collect(Collectors.toSet());
    unitGraph.setGlobalCurve(elements);
    double maxEnergy = elements.stream().map(HolonElement::getEnergy).filter(energy -> energy > 0)
        .reduce(0.0f,
            Float::sum);
    double minEnergy = elements.stream().map(HolonElement::getEnergy).filter(energy -> energy < 0)
        .reduce(0.0f,
            Float::sum);
    double percentage = Maths.invLerp(maxEnergy, minEnergy, 0.0);
    int widgetHeight = this.globalCurveLabel.getHeight();
    int textMiddle = this.zeroEnergy.getPreferredSize().height / 4;
    int zeroYPos = (int) (widgetHeight * percentage) - 5;
    this.minEnergy.setText(Format.doubleTwoPlaces(minEnergy));
    this.maxEnergy.setText(Format.doubleTwoPlaces(maxEnergy));
    this.maxEnergy.setBounds(0, 0, this.maxEnergy.getPreferredSize().width,
        this.maxEnergy.getPreferredSize().height);
    this.minEnergy.setBounds(0, widgetHeight - this.minEnergy.getPreferredSize().height,
        this.minEnergy.getPreferredSize().width,
        this.minEnergy.getPreferredSize().height);
    this.zeroEnergy.setBounds(0, zeroYPos, this.zeroEnergy.getPreferredSize().width,
        this.zeroEnergy.getPreferredSize().height);
    this.globalCurveLabel.setPreferredSize(new Dimension(
        Math.max(this.zeroEnergy.getPreferredSize().width,
            Math.max(this.maxEnergy.getPreferredSize().width,
                this.minEnergy.getPreferredSize().width)),
        0));
  }

  /**
   * Displayed the actual LocalModeState.
   *
   * @param enabled
   */
  private void changeLocalPeriodButtonAppearance(boolean enabled) {
    localPeriodInput.setVisible(enabled);
    localPeriodButton.setIcon(
        enabled ? localPeriodButtonImageEnabled : localPeriodButtonImageDisabled);
  }

}