package com.gpl.rpg.atcontentstudio.ui.sprites;

import java.awt.BorderLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Image;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JToggleButton;
import javax.swing.ScrollPaneConstants;

import com.gpl.rpg.atcontentstudio.ATContentStudio;
import com.gpl.rpg.atcontentstudio.model.Project;
import com.gpl.rpg.atcontentstudio.model.sprites.Spritesheet;
import com.gpl.rpg.atcontentstudio.model.sprites.Spritesheet.Category;


public class SpriteChooser extends JDialog {

	private static final long serialVersionUID = -6018113265015159521L;
	
	private static final int STD_WIDTH = 32;
	private static final int STD_HEIGHT = 32;
	private static final int MAX_PER_ROW = 10;
	
	public static Map<Project, Map<Spritesheet.Category, SpriteChooser>> cache = new HashMap<Project, Map<Spritesheet.Category,SpriteChooser>>();

	public static SpriteChooser getChooser(Project proj, Spritesheet.Category category) {
		if (cache.get(proj) == null) {
			cache.put(proj, new HashMap<Spritesheet.Category, SpriteChooser>());
		}
		if (cache.get(proj).get(category) == null) {
			cache.get(proj).put(category, new SpriteChooser(proj, category));
		}
		SpriteChooser wanted = cache.get(proj).get(category);
		wanted.group.clearSelection();
		wanted.selectedIconId = null;
//		wanted.selectedOne = null;
		wanted.listener = null;
//		wanted.ok.setEnabled(false);
		wanted.pack();
		return wanted;
	}
	
	private ButtonGroup group;
//	private IconButton selectedOne = null;
//	private JButton ok;
//	private JButton cancel;
	
	public String selectedIconId = null;
	
	public SpriteChooser(Project proj, Category category) {
		super(ATContentStudio.frame);
		setTitle("Select a sprite");
		setModalityType(ModalityType.APPLICATION_MODAL);
		List<Spritesheet> spritesheets = new ArrayList<Spritesheet>();
		for (Spritesheet sheet : proj.baseContent.gameSprites.spritesheets) {
			if (sheet.category == category) {
				spritesheets.add(sheet);
			}
		}
		
		
		JPanel pane = new JPanel();
		pane.setLayout(new GridBagLayout());
		GridBagConstraints c = new GridBagConstraints();
		c.weightx = 1;
		c.weighty = 1;
		c.gridx = 0;
		c.gridy = 0;
		c.gridwidth = 1;
		c.gridheight = 1;
		c.anchor = GridBagConstraints.NORTHWEST;
		c.fill = GridBagConstraints.BOTH;
		
		List<Point> reservedSlots = new ArrayList<Point>();
		Point nextFreeSlot = new Point(0, 0);
		
		int i;
		Image img;
		group = new ButtonGroup();
		for (Spritesheet sheet : spritesheets) {
			i = 0;
			while ((img = sheet.getImage(i)) != null) {
				IconButton button = new IconButton(img, sheet.id, i);
				group.add(button);
				if (sheet.spriteWidth == STD_WIDTH && sheet.spriteHeight == STD_HEIGHT) {
					pane.add(button, c);
					c.gridx++;
					if (c.gridx >= MAX_PER_ROW) {
						c.gridx = 0;
						c.gridy++;
					}
					nextFreeSlot.setLocation(c.gridx,  c.gridy);
				} else {
					c.gridwidth = (sheet.spriteWidth / STD_WIDTH) + (sheet.spriteWidth % STD_WIDTH == 0 ? 0 : 1);
					c.gridheight = (sheet.spriteHeight / STD_HEIGHT) + (sheet.spriteHeight % STD_HEIGHT == 0 ? 0 : 1);
					boolean slotOk = false;
					while (!slotOk) {
						slotOk = true;
						for (int x = c.gridx; x < c.gridx + c.gridwidth; x++) {
							for (int y = c.gridy; y < c.gridy + c.gridwidth; y++) {
								if (reservedSlots.contains(new Point(x, y))) {
									slotOk = false;
								}
							}
						}
						if (slotOk && c.gridx + c.gridwidth > MAX_PER_ROW) {
							c.gridx = 0;
							c.gridy++;
							slotOk = false;
						}
					}
					pane.add(button, c);
					for (int x = c.gridx; x < c.gridx + c.gridwidth; x++) {
						for (int y = c.gridy; y < c.gridy + c.gridwidth; y++) {
							reservedSlots.add(new Point(x, y));
						}
					}
					c.gridwidth = 1;
					c.gridheight = 1;
					c.gridx = nextFreeSlot.x;
					c.gridy = nextFreeSlot.y;
				}
				while (reservedSlots.contains(nextFreeSlot)) {
					c.gridx++;
					if (c.gridx >= MAX_PER_ROW) {
						c.gridx = 0;
						c.gridy++;
					}
					nextFreeSlot.setLocation(c.gridx,  c.gridy);
				}
				i++;
			}
		}
		
//		ok = new JButton("Ok");
//		cancel = new JButton("Cancel");
		
		c.gridx = 0;
		boolean emptyLine = false;
		while (!emptyLine) {
			c.gridy++;
			emptyLine = true;
			for (i = MAX_PER_ROW - 1; i >= 0; i--) {
				if (reservedSlots.contains(new Point(i, c.gridy))) {
					emptyLine = false;
					continue;
				}
			}
		}
		
//		JPanel buttonPane = new JPanel();
//		buttonPane.add(cancel, BorderLayout.WEST);
//		buttonPane.add(ok, BorderLayout.EAST);

		JPanel wrapper = new JPanel();
		wrapper.setLayout(new BorderLayout());
		JScrollPane scroller = new JScrollPane(pane);
		scroller.getVerticalScrollBar().setUnitIncrement(16);
		scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		wrapper.add(scroller, BorderLayout.CENTER);
//		wrapper.add(buttonPane, BorderLayout.SOUTH);
		
//		ok.addActionListener(new ActionListener() {
//			@Override
//			public void actionPerformed(ActionEvent e) {
//				selectedIconId = selectedOne.sheetId+":"+selectedOne.spriteIndex;
//				SpriteChooser.this.setVisible(false);
//				SpriteChooser.this.dispose();
//				if (listener != null) listener.iconSelected(selectedIconId);
//			}
//		});
		
//		cancel.addActionListener(new ActionListener() {
//			@Override
//			public void actionPerformed(ActionEvent e) {
//				selectedIconId = null;
//				SpriteChooser.this.setVisible(false);
//				SpriteChooser.this.dispose();
//				if (listener != null) listener.iconSelected(null);
//			}
//		});
		
		setContentPane(wrapper);
	}
	
	private SpriteChooser.SelectionListener listener = null;
	
	public void setSelectionListener(SpriteChooser.SelectionListener l) {
		listener = l;
	}
	
	
	public class IconButton extends JToggleButton {
		
		private static final long serialVersionUID = 7559407153561178455L;
		
		public String sheetId;
		public int spriteIndex;

		public IconButton(Image img, String sheetId, int spriteIndex) {
			super(new ImageIcon(img));
			this.sheetId = sheetId;
			this.spriteIndex = spriteIndex;
			setToolTipText(sheetId+":"+spriteIndex);
			addActionListener(new ActionListener() {
				@Override
				public void actionPerformed(ActionEvent e) {
					if (IconButton.this.isSelected()) {
						selectedIconId = IconButton.this.sheetId+":"+IconButton.this.spriteIndex;
						SpriteChooser.this.setVisible(false);
						SpriteChooser.this.dispose();
						if (listener != null) listener.iconSelected(selectedIconId);
					}
				}
			});
		}
	}
	
	public static interface SelectionListener {
		public void iconSelected(String selected);
	}
	
}