package jrummikub.view.impl;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import javax.swing.border.EmptyBorder;

import jrummikub.model.Position;
import jrummikub.model.Stone;
import jrummikub.util.Pair;
import jrummikub.view.IStoneCollectionPanel;

/**
 * Implementation of the stone collection (selection)
 */
@SuppressWarnings("serial")
class StoneCollectionPanel extends AbstractStonePanel implements
		IStoneCollectionPanel {
	private final static int INSET = 7;

	private Collection<Stone> selectedStones = Collections.emptyList();

	/**
	 * Creates a new StoneCollection instance
	 */
	StoneCollectionPanel() {
		setOpaque(false);
		setVisible(false);
		setBorder(new EmptyBorder(INSET, INSET, INSET, INSET));
	}

	private void rescale() {
		setSize(getStonePainter().getStoneWidth() * selectedStones.size() + 2
				* INSET, getStonePainter().getStoneHeight() + 2 * INSET);
	}

	/**
	 * Sets the height to paint the collected stones in
	 * 
	 * @param height
	 *          the height in pixels
	 */
	void setStoneHeight(int height) {
		getStonePainter().setScale(height * StonePainter.HEIGHT_SCALE);

		rescale();
		repaint();
	}

	/**
	 * Sets the stones to be shown in the collection
	 * 
	 * @param selectedStones
	 *          the selected stones
	 */
	void setSelectedStones(Collection<Stone> selectedStones) {
		this.selectedStones = selectedStones;

		List<Pair<Stone, Position>> stones = new ArrayList<Pair<Stone, Position>>();
		float x = 0;

		for (Stone stone : selectedStones) {
			stones.add(new Pair<Stone, Position>(stone, new Position(x, 0)));
			x++;
		}

		setStones(stones);

		if (selectedStones.isEmpty()) {
			setVisible(false);
		} else {
			rescale();
			setVisible(true);

			repaint();
		}
	}

	@Override
	public void paintComponent(Graphics g1) {
		Insets insets = getInsets();
		int x = insets.left, y = insets.top, width = getWidth() - insets.left
				- insets.right, height = getHeight() - insets.top - insets.bottom;
		Graphics2D g = (Graphics2D) g1.create(x, y, width, height);

		if (!selectedStones.isEmpty()) {
			g1.setColor(new Color(0, 0, 0, 0.25f));
			g1.fillRoundRect(0, 0, getWidth(), getHeight(), INSET, INSET);

			float xpos = 0;

			for (Stone stone : selectedStones) {
				getStonePainter().paintStone(g, stone, new Position(xpos, 0), false);
				xpos++;
			}
		}
	}
}