package catdata.ide;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.function.Function;

import javax.swing.AbstractButton;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.plaf.basic.BasicButtonUI;

import catdata.Unit;

/**
 * Component to be used as tabComponent; Contains a JLabel to show the text and
 * a JButton to close the tab it belongs to
 */
@SuppressWarnings("serial")
class ButtonTabComponent extends JPanel {
	private final JTabbedPane pane;

	private Function<CodeEditor<?, ?, ?>, Unit> callback;

	public ButtonTabComponent(JTabbedPane pane, Function<CodeEditor<?, ?, ?>, Unit> callback) {
		// unset default FlowLayout' gaps
		super(new FlowLayout(FlowLayout.LEFT, 0, 0));
		if (pane == null) {
			throw new NullPointerException("TabbedPane is null");
		}
		this.pane = pane;
		this.callback = callback;
		setOpaque(false);

		// make JLabel read titles from JTabbedPane
		JLabel label = new JLabel() {
			@Override
			public String getText() {
				int i = pane.indexOfTabComponent(ButtonTabComponent.this);
				if (i != -1) {
					return pane.getTitleAt(i);
				}
				return null;
			}
		};

		add(label);
		// add more space between the label and the button
		label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
		// tab button
		JButton button = new TabButton();
		add(button);
		// add more space to the top of the component
		setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
	}

	private class TabButton extends JButton implements ActionListener {
		private TabButton() {
			int size = 17;
			setPreferredSize(new Dimension(size, size));
			setToolTipText("close this tab");
			// Make the button looks the same for all Laf's
			setUI(new BasicButtonUI());
			// Make it transparent
			setContentAreaFilled(false);
			// No need to be focusable
			setFocusable(false);
			setBorder(BorderFactory.createEtchedBorder());
			setBorderPainted(false);
			// Making nice rollover effect
			// we use the same listener for all buttons
			addMouseListener(buttonMouseListener);
			setRolloverEnabled(true);
			// Close the proper tab by clicking the button
			addActionListener(this);
		}

		@Override
		public void actionPerformed(ActionEvent e) {
			int i = pane.indexOfTabComponent(ButtonTabComponent.this);
			if (i != -1) {
				@SuppressWarnings("rawtypes")
				CodeEditor c = ((CodeEditor) pane.getComponentAt(i));
				if (c.abortBecauseDirty()) {
					return;
				}
				// pane.remove(i); //done by GUI
				callback.apply(c);
			}
		}

		// we don't want to update UI for this button
		@Override
		public void updateUI() {
		}

		// paint the cross
		@Override
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			Graphics2D g2 = (Graphics2D) g.create();
			// shift the image for pressed buttons
			if (getModel().isPressed()) {
				g2.translate(1, 1);
			}
			g2.setStroke(new BasicStroke(2));
			g2.setColor(Color.BLACK);
			if (getModel().isRollover()) {
				g2.setColor(Color.MAGENTA);
			}
			int delta = 6;
			g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight() - delta - 1);
			g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight() - delta - 1);
			g2.dispose();
		}
	}

	private static final MouseListener buttonMouseListener = new MouseAdapter() {
		@Override
		public void mouseEntered(MouseEvent e) {
			Component component = e.getComponent();
			if (component instanceof AbstractButton) {
				AbstractButton button = (AbstractButton) component;
				button.setBorderPainted(true);
			}
		}

		@Override
		public void mouseExited(MouseEvent e) {
			Component component = e.getComponent();
			if (component instanceof AbstractButton) {
				AbstractButton button = (AbstractButton) component;
				button.setBorderPainted(false);
			}
		}
	};
}