praktikum-holons/src/holeg/ui/view/inspector/InspectorTable.java

package holeg.ui.view.inspector;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.math.RoundingMode;
import java.text.NumberFormat;
import java.util.Collection;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.ArrayList;

import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFormattedTextField;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.SwingConstants;
import javax.swing.text.NumberFormatter;

import holeg.model.AbstractCanvasObject;
import holeg.model.GroupNode;
import holeg.model.HolonElement;
import holeg.model.HolonObject;
import holeg.model.HolonElement.Priority;
import holeg.preferences.ColorPreference;
import holeg.ui.controller.Control;
import holeg.ui.model.GuiSettings;
import holeg.ui.view.component.TrippleCheckBox;
import holeg.ui.view.component.TrippleCheckBox.State;
import holeg.utility.events.Action;
import holeg.ui.view.image.Import;
import holeg.utility.listener.SimpleDocumentListener;
import holeg.utility.pooling.Pool;
import net.miginfocom.swing.MigLayout;

public class InspectorTable extends JPanel {
	private final Pool<ElementRow> rowPool = new Pool<>() {
		@Override
		public ElementRow create() {
			return new ElementRow();
		}
	};

	private final int maxDisplayedRowsNumber = 100;
	private int actualPage = 0;
	private int maxPageNumberForThisSelection = 0;
	private final Control control;
	// UI
	private final TrippleCheckBox selectAllCheckBox = new TrippleCheckBox();
	private final JButton addButton = new JButton();
	private final JButton duplicateButton = new JButton();
	private final JButton deleteButton = new JButton();
	private final JPanel buttonPanel = new JPanel();

	private final JButton pageIncreaseButton = new JButton();
	private final JButton pageDecreaseButton = new JButton();
	private final JLabel pageInformationLabel = new JLabel();
	private final JPanel pageSelectionPanel = new JPanel();
	private final ArrayList<SortButton<ElementRow>> headerButtonList = new ArrayList<>();
	private final static NumberFormatter doubleFormatter = generateNumberFormatter();

	// sorting
	private Comparator<ElementRow> actual_comp = (ElementRow a, ElementRow b) -> Float.compare(a.element.getEnergy(),
			b.element.getEnergy());

	// Colors

	// Events
	public Action<Set<HolonElement>> OnElementSelectionChanged = new Action<>();
	private Thread populateRowsThread;
	private boolean abortThread = false;

	public InspectorTable(Control control) {
		control.OnSelectionChanged.addListener(this::updateInspectorUi);
		this.control = control;
		init();
		addHeader();
	}

	private void init() {
		MigLayout layout = new MigLayout("insets 0,gap 0,wrap 7", // Layout Constraints
				"[][fill, grow][fill][fill, grow][fill, grow][][fill]", // Column constraints
				"[25!][20:20:20]"); // Row constraints
		this.setLayout(layout);
		initSelectAllCheckBox();
		initButtons();
		initKeyControls();
		initHeaderButtons();
	}

	private void initKeyControls() {
		this.getInputMap(WHEN_IN_FOCUSED_WINDOW)
				.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, InputEvent.ALT_DOWN_MASK), "PageRight");
		this.getInputMap(WHEN_IN_FOCUSED_WINDOW).put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, InputEvent.ALT_DOWN_MASK),
				"PageLeft");

		this.getActionMap().put("PageRight", new AbstractAction() {

			@Override
			public void actionPerformed(ActionEvent e) {
				performPageAction(PageAction.Increase);
			}

		});
		this.getActionMap().put("PageLeft", new AbstractAction() {
			@Override
			public void actionPerformed(ActionEvent e) {
				performPageAction(PageAction.Decrease);
			}

		});
	}

	private enum PageAction {
		Increase, Decrease
	};

	private void performPageAction(PageAction action) {
		int newPageNumber = switch (action) {
			case Decrease -> Math.max(actualPage - 1, 0);
			default -> Math.min(actualPage + 1, maxPageNumberForThisSelection);
		};
		if (newPageNumber != actualPage) {
			actualPage = newPageNumber;
			updateTableUi();
			updatePageButtonAppearance();
		}

	}

	private void updatePageButtonAppearance() {
		this.pageDecreaseButton.setEnabled(actualPage != 0);
		this.pageIncreaseButton.setEnabled(actualPage != maxPageNumberForThisSelection);
	}

	private static NumberFormatter generateNumberFormatter() {
		NumberFormat doubleFormat = NumberFormat.getNumberInstance(Locale.US);
		doubleFormat.setMinimumFractionDigits(1);
		doubleFormat.setMaximumFractionDigits(10);
		doubleFormat.setRoundingMode(RoundingMode.HALF_UP);
		doubleFormat.setGroupingUsed(false);
		NumberFormatter doubleFormatter = new NumberFormatter(doubleFormat);
		doubleFormatter.setCommitsOnValidEdit(true);
		doubleFormatter.setValueClass(Double.class);
		return doubleFormatter;
	}

	private void initHeaderButtons() {
		Comparator<ElementRow> objectComp = Comparator.comparing((ElementRow a) -> a.element.parentObject.getName());
		Comparator<ElementRow> idComp = Comparator.comparingInt((ElementRow a) -> a.element.parentObject.getId());
		Comparator<ElementRow> deviceComp = Comparator.comparing((ElementRow a) -> a.element.getName());
		Comparator<ElementRow> energyComp = (ElementRow a, ElementRow b) -> Float.compare(a.element.getEnergy(),
				b.element.getEnergy());
		Comparator<ElementRow> priorityComp = Comparator.comparing((ElementRow a) -> a.element.getPriority());
		Comparator<ElementRow> activeComp = (ElementRow a, ElementRow b) -> Boolean.compare(a.element.active,
				b.element.active);
		;

		headerButtonList.add(new SortButton<>("Object", objectComp));
		headerButtonList.add(new SortButton<>("Id", idComp));
		headerButtonList.add(new SortButton<>("Device", deviceComp));
		headerButtonList.add(new SortButton<>("Energy", energyComp));
		headerButtonList.add(new SortButton<>("Priority", priorityComp));
		headerButtonList.add(new SortButton<>("Active", activeComp));
	}

	private void addHeader() {
		this.add(selectAllCheckBox);
		for (SortButton<ElementRow> button : headerButtonList) {
			this.add(button);
		}
	}

	private void initSelectAllCheckBox() {
		selectAllCheckBox.setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
		// Pixel Perfect alignment
		selectAllCheckBox.setBorder(BorderFactory.createEmptyBorder(2, 3, 0, 0));
		selectAllCheckBox.addActionListener(clicked -> {
			switch (selectAllCheckBox.getSelectionState()) {
			case mid_state_selection:
			case selected: {
				rowPool.getBorrowedStream().forEach(row -> row.setSelected(false));
				duplicateButton.setEnabled(false);
				deleteButton.setEnabled(false);
			}
				break;
			case unselected:
				if (rowPool.getBorrowedCount() != 0) {
					rowPool.getBorrowedStream().forEach(row -> row.setSelected(true));
					duplicateButton.setEnabled(true);
					deleteButton.setEnabled(true);
				}
			default:
				break;
			}
			updateElementSelection();
		});
	}

	private void initButtons() {
		buttonPanel.setLayout(new BoxLayout(buttonPanel, BoxLayout.LINE_AXIS));
		buttonPanel.add(Box.createRigidArea(new Dimension(2, 0)));

		addButton.setIcon(new ImageIcon(Import.loadImage("images/buttons/plus.png", 16, 16)));
		addButton.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
		addButton.addActionListener(clicked -> {
			Optional<HolonObject> last = GuiSettings.getSelectedObjects().stream()
					.filter(obj -> obj instanceof HolonObject).reduce((prev, next) -> next)
					.map(obj -> (HolonObject) obj);
			last.ifPresent(obj -> {
				obj.add(new HolonElement(obj, "Element", 0.0f));
				control.calculateStateForCurrentIteration();
				updateInspectorUi();
			});
		});
		buttonPanel.add(addButton);

		duplicateButton.setIcon(new ImageIcon(Import.loadImage("images/buttons/duplicate.png", 16, 16)));
		duplicateButton.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
		duplicateButton.addActionListener(clicked -> {
			rowPool.getBorrowedStream().forEach(row -> {
				if (row.isSelected()) {
					row.element.parentObject.add(new HolonElement(row.element));
				}
			});
			control.calculateStateForCurrentIteration();
			updateInspectorUi();
		});
		buttonPanel.add(duplicateButton);

		deleteButton.setIcon(new ImageIcon(Import.loadImage("images/buttons/minus.png", 16, 16)));
		deleteButton.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
		deleteButton.addActionListener(clicked -> {
			rowPool.getBorrowedStream().forEach(row -> {
				if (row.isSelected()) {
					row.element.parentObject.remove(row.element);
				}
			});
			control.calculateStateForCurrentIteration();
			updateInspectorUi();
		});
		buttonPanel.add(deleteButton);

		pageIncreaseButton.setIcon(new ImageIcon(Import.loadImage("images/buttons/page_increase.png", 16, 16)));
		pageIncreaseButton.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
		pageIncreaseButton.addActionListener(clicked -> this.performPageAction(PageAction.Increase));

		pageDecreaseButton.setIcon(new ImageIcon(Import.loadImage("images/buttons/page_decrease.png", 16, 16)));
		pageDecreaseButton.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
		pageDecreaseButton.addActionListener(clicked -> this.performPageAction(PageAction.Decrease));

		pageInformationLabel.setForeground(Color.gray);

		pageSelectionPanel.setLayout(new BoxLayout(pageSelectionPanel, BoxLayout.LINE_AXIS));
		pageSelectionPanel.add(Box.createRigidArea(new Dimension(2, 0)));
		pageSelectionPanel.add(this.pageInformationLabel);
		pageSelectionPanel.add(Box.createHorizontalGlue());
		pageSelectionPanel.add(this.pageDecreaseButton);
		pageSelectionPanel.add(this.pageIncreaseButton);
	}

	private void assignElementsToRowPool(Set<AbstractCanvasObject> selection) {
		List<HolonElement> elementList = extractElements(selection).toList();
		rowPool.clear();
		for (HolonElement element : elementList) {
			ElementRow row = rowPool.get();
			row.setElement(element);
		}
		actualPage = 0;
		this.maxPageNumberForThisSelection = elementList.size() / this.maxDisplayedRowsNumber;
		updatePageButtonAppearance();
	}

	private void updateTableUi() {

		// Maybe abort current thread and join them
		if (populateRowsThread != null) {
			try {
				abortThread = true;
				populateRowsThread.join();
				populateRowsThread.join();
				abortThread = false;
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		populateRowsThread = new Thread(() -> {
			int numberOfRows = rowPool.getBorrowedCount();
			this.removeAll();
			addHeader();
			rowPool.getBorrowedStream().sorted(actual_comp).skip((long) actualPage * maxDisplayedRowsNumber)
					.limit(maxDisplayedRowsNumber).takeWhile(row -> !abortThread).forEach(ElementRow::addContainerToInspector);
			if (numberOfRows > maxDisplayedRowsNumber) {
				int lastDisplayedElementNumber = Math.min(numberOfRows, (actualPage + 1) * maxDisplayedRowsNumber);
				pageInformationLabel.setText(String.format("%d - %d from %d", 1 + actualPage * maxDisplayedRowsNumber,
						lastDisplayedElementNumber, numberOfRows));
				this.add(pageSelectionPanel, "span, grow");
			}

			this.add(buttonPanel, "span");
			boolean isAtLeastOneHolonObjectSelected = GuiSettings.getSelectedObjects().stream()
					.anyMatch(object -> object instanceof HolonObject);
			this.addButton.setEnabled(isAtLeastOneHolonObjectSelected);
			duplicateButton.setEnabled(false);
			deleteButton.setEnabled(false);
			selectAllCheckBox.setSelectionState(State.unselected);
			revalidate();
			repaint();
			this.OnElementSelectionChanged.broadcast(new HashSet<>());
		});
		populateRowsThread.start();

	}

	private void updateInspectorUi() {
		// clone for concurrency
		Set<AbstractCanvasObject> selection = new HashSet<>(GuiSettings.getSelectedObjects());
		assignElementsToRowPool(selection);
		updateTableUi();
	}

	private void updateElementSelection() {
		Set<HolonElement> eleSet = rowPool.getBorrowedStream().filter(ElementRow::isSelected).map(row -> row.element)
				.collect(Collectors.toSet());
		this.OnElementSelectionChanged.broadcast(eleSet);
	}

	private void updateButtonAppearance() {
		long count = rowPool.getBorrowedStream().filter(ElementRow::isSelected).count();
		if (count == rowPool.getBorrowedCount()) {
			selectAllCheckBox.setSelectionState(State.selected);
		} else if (count == 0) {
			selectAllCheckBox.setSelectionState(State.unselected);
		} else {
			selectAllCheckBox.setSelectionState(State.mid_state_selection);
		}
		duplicateButton.setEnabled(count != 0);
		deleteButton.setEnabled(count != 0);
	}

	// Extract elements from a list of AbstractCanvasObjects
	static Stream<HolonElement> extractElements(Collection<AbstractCanvasObject> toInspect) {
		Stream<HolonElement> recursiveLayer = toInspect.stream().filter(object -> object instanceof GroupNode).flatMap(
				obj -> ((GroupNode) obj).getAllHolonObjectsRecursive().flatMap(HolonObject::elementsStream));
		Stream<HolonElement> thisLayer = toInspect.stream().filter(obj -> obj instanceof HolonObject).flatMap(obj -> {
			HolonObject ho = (HolonObject) obj;
			return ho.elementsStream();
		});
		return Stream.concat(thisLayer, recursiveLayer);
	}

	private class ElementRow {
		private HolonElement element = null;
		private final Container[] cellsInRow = new Container[7];
		// TextBoxes
		private JTextField elementNameTextField;
		private JCheckBox selectionBox;
		private JTextField idObjectTextField;
		private JFormattedTextField energyTextField;
		private JComboBox<Priority> comboBox;
		private JCheckBox activeCheckBox;
		private JTextField objectNameTextField;

		public ElementRow() {
			this.createEditFields();
		}

		public void addContainerToInspector() {
			for (Container cell : cellsInRow) {
				InspectorTable.this.add(cell);
			}
		}

		public void setSelected(boolean value) {
			selectionBox.setSelected(value);
			// Color row
			for (Container cell : cellsInRow) {
				cell.setBackground(selectionBox.isSelected() ? ColorPreference.Inspector.Selected : Color.white);
			}
		}

		public boolean isSelected() {
			return selectionBox.isSelected();
		}

		public void setElement(HolonElement element) {
			this.element = element;
			setSelected(false);
			objectNameTextField.setText(this.element.parentObject.getName());
			idObjectTextField.setText(Integer.toString(this.element.parentObject.getId()));
			elementNameTextField.setText(this.element.getName());
			energyTextField.setValue(this.element.getEnergy());
			comboBox.setSelectedItem(this.element.getPriority());
			activeCheckBox.setSelected(this.element.active);
		}

		private void createEditFields() {
			// Selected
			JPanel selectedColumnPanel = new JPanel(new BorderLayout());
			selectedColumnPanel.setBackground(Color.white);
			selectedColumnPanel.setBorder(BorderFactory.createLineBorder(ColorPreference.Inspector.Border));
			selectionBox = new JCheckBox();
			selectionBox.addActionListener(clicked -> {
				setSelected(selectionBox.isSelected());
				updateButtonAppearance();
				updateElementSelection();
			});
			int columnHeight = 20;
			selectedColumnPanel.setMinimumSize(new Dimension(columnHeight, columnHeight));
			selectedColumnPanel.setPreferredSize(new Dimension(columnHeight, columnHeight));
			selectedColumnPanel.setMaximumSize(new Dimension(columnHeight, columnHeight));
			selectionBox.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 0));
			selectionBox.setOpaque(false);
			selectedColumnPanel.add(selectionBox, BorderLayout.CENTER);
			cellsInRow[0] = selectedColumnPanel;

			// ObjectName and ID
			objectNameTextField = new JTextField();
			objectNameTextField.getDocument().addDocumentListener((SimpleDocumentListener) e -> {
				this.element.parentObject.setName(objectNameTextField.getText());
			});
			objectNameTextField.addActionListener(ae -> updateInspectorUi());
			cellsInRow[1] = objectNameTextField;
			idObjectTextField = new JTextField();
			idObjectTextField.setMinimumSize(idObjectTextField.getPreferredSize());
			idObjectTextField.setBackground(Color.white);
			idObjectTextField.setEditable(false);
			idObjectTextField.setEnabled(false);
			cellsInRow[2] = idObjectTextField;
			// Name
			elementNameTextField = new JTextField();
			elementNameTextField.getDocument().addDocumentListener((SimpleDocumentListener) e -> {
				this.element.setName(elementNameTextField.getText());
			});
			elementNameTextField.setBackground(Color.white);
			cellsInRow[3] = elementNameTextField;
			// Energy

			energyTextField = new JFormattedTextField(doubleFormatter);
			energyTextField.setInputVerifier(getInputVerifier());

			energyTextField.setBackground(Color.white);
			energyTextField.addPropertyChangeListener(actionEvent -> {
				try {
					float energy = Float.parseFloat(energyTextField.getText());
					if (this.element.getEnergy() != energy) {
						this.element.setEnergy(energy);
						control.updateStateForCurrentIteration();
					}
				} catch (NumberFormatException e) {
					// Dont Update
				}

			});
			cellsInRow[4] = energyTextField;

			// Priority
			comboBox = new JComboBox<Priority>(Priority.values());
			comboBox.setBackground(Color.white);
			comboBox.setEditable(false);
			comboBox.addActionListener(ae -> {
				this.element.setPriority((Priority) comboBox.getSelectedItem());
				control.updateStateForCurrentIteration();
			});
			cellsInRow[5] = comboBox;

			JPanel checkBoxWrapperPanel = new JPanel(new BorderLayout());
			checkBoxWrapperPanel.setBorder(BorderFactory.createLineBorder(ColorPreference.Inspector.Border));
			checkBoxWrapperPanel.setBackground(Color.white);
			checkBoxWrapperPanel.setMinimumSize(new Dimension(columnHeight, columnHeight));
			checkBoxWrapperPanel.setMaximumSize(new Dimension(Integer.MAX_VALUE, columnHeight));
			// Active
			activeCheckBox = new JCheckBox();
			activeCheckBox.setBorder(BorderFactory.createEmptyBorder(0, 2, 0, 0));
			activeCheckBox.setOpaque(false);
			activeCheckBox.addActionListener(actionEvent -> {
				this.element.active = activeCheckBox.isSelected();
				control.updateStateForCurrentIteration();
			});
			checkBoxWrapperPanel.add(activeCheckBox, BorderLayout.CENTER);
			cellsInRow[6] = checkBoxWrapperPanel;
		}

	}

	private enum SortState {
		None, Descending, Ascending
	};

	private class SortButton<T> extends JButton {
		private SortState state = SortState.None;
		private Comparator<T> comp;

		public SortButton(String text, Comparator<T> comp) {
			super(text);
			this.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 0));
			this.setContentAreaFilled(false);
			this.setBorderPainted(false);
			this.setFocusPainted(false);
			this.setHorizontalAlignment(SwingConstants.LEFT);
			this.comp = comp;
			this.addActionListener(onClick -> changeStateOnClick());
		}

		@SuppressWarnings("unchecked")
		private void changeStateOnClick() {
			setState((this.state == SortState.Ascending) ? SortState.Descending : SortState.Ascending);
			headerButtonList.stream().filter(button -> (button != this))
					.forEach(button -> button.setState(SortState.None));
			actual_comp = (Comparator<ElementRow>) getComp();
			updateInspectorUi();
		}

		public void setState(SortState state) {
			this.state = state;
			String text = this.getText();
			// remove order symbols from text
			text = text.replaceAll("\u25bc|\u25b2", "");
			// update text
			switch (state) {
				case Descending -> this.setText(text + "\u25bc");
				case Ascending -> this.setText(text + "\u25b2");
				default -> this.setText(text);
			}
		}

		public Comparator<T> getComp() {
			return switch (state) {
				case Descending -> comp.reversed();
				default -> comp;
			};
		}
	}
}