/*
 * Pixel Dungeon
 * Copyright (C) 2012-2015  Oleg Dolya
 *
 * Shattered Pixel Dungeon
 * Copyright (C) 2014-2015 Evan Debenham
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
package com.shatteredpixel.shatteredpixeldungeon.ui;

import com.shatteredpixel.shatteredpixeldungeon.items.EquipableItem;
import com.shatteredpixel.shatteredpixeldungeon.items.wands.Wand;
import com.watabou.noosa.Image;
import com.watabou.noosa.ui.Button;
import com.shatteredpixel.shatteredpixeldungeon.Dungeon;
import com.shatteredpixel.shatteredpixeldungeon.DungeonTilemap;
import com.shatteredpixel.shatteredpixeldungeon.actors.Actor;
import com.shatteredpixel.shatteredpixeldungeon.actors.Char;
import com.shatteredpixel.shatteredpixeldungeon.items.Item;
import com.shatteredpixel.shatteredpixeldungeon.scenes.GameScene;
import com.shatteredpixel.shatteredpixeldungeon.scenes.PixelScene;
import com.shatteredpixel.shatteredpixeldungeon.windows.WndBag;

public class QuickSlotButton extends Button implements WndBag.Listener {

	private static final String TXT_SELECT_ITEM = "Select an item for the quickslot";
	
	private static QuickSlotButton[] instance = new QuickSlotButton[4];
	private int slotNum;

	private ItemSlot slot;
	
	private static Image crossB;
	private static Image crossM;
	
	private static boolean targeting = false;
	private static Char lastTarget= null;
	
	public QuickSlotButton( int slotNum ) {
		super();
		this.slotNum = slotNum;
		item( select( slotNum ) );
		
		instance[slotNum] = this;
	}
	
	@Override
	public void destroy() {
		super.destroy();
		
		reset();
	}

	public static void reset() {
		instance = new QuickSlotButton[4];

		lastTarget = null;
	}
	
	@Override
	protected void createChildren() {
		super.createChildren();
		
		slot = new ItemSlot() {
			@Override
			protected void onClick() {
				if (targeting) {
					GameScene.handleCell( lastTarget.pos );
				} else {
					Item item = select(slotNum);
					//FIXME: sloppy, should have a better way to decide if an item uses targeting.
					if (item instanceof EquipableItem || item instanceof Wand)
						useTargeting();
					item.execute( Dungeon.hero );
				}
			}
			@Override
			protected boolean onLongClick() {
				return QuickSlotButton.this.onLongClick();
			}
			@Override
			protected void onTouchDown() {
				icon.lightness( 0.7f );
			}
			@Override
			protected void onTouchUp() {
				icon.resetColor();
			}
		};
		slot.showParams( true, false, true );
		add( slot );
		
		crossB = Icons.TARGET.get();
		crossB.visible = false;
		add( crossB );
		
		crossM = new Image();
		crossM.copy( crossB );
	}
	
	@Override
	protected void layout() {
		super.layout();
		
		slot.fill( this );
		
		crossB.x = PixelScene.align( x + (width - crossB.width) / 2 );
		crossB.y = PixelScene.align( y + (height - crossB.height) / 2 );
	}
	
	@Override
	protected void onClick() {
		GameScene.selectItem( this, WndBag.Mode.QUICKSLOT, TXT_SELECT_ITEM );
	}
	
	@Override
	protected boolean onLongClick() {
		GameScene.selectItem( this, WndBag.Mode.QUICKSLOT, TXT_SELECT_ITEM );
		return true;
	}

	private static Item select(int slotNum){
		return Dungeon.quickslot.getItem( slotNum );
	}

	@Override
	public void onSelect( Item item ) {
		if (item != null) {
			Dungeon.quickslot.setSlot( slotNum , item );
			refresh();
		}
	}
	
	public void item( Item item ) {
		slot.item( item );
		enableSlot();
	}
	
	public void enable( boolean value ) {
		active = value;
		if (value) {
			enableSlot();
		} else {
			slot.enable( false );
		}
	}
	
	private void enableSlot() {
		slot.enable(Dungeon.quickslot.isNonePlaceholder( slotNum ));
	}
	
	private void useTargeting() {
		
		targeting = lastTarget != null && lastTarget.isAlive() && Dungeon.visible[lastTarget.pos];
		
		if (targeting) {
			if (Actor.chars().contains( lastTarget )) {
				lastTarget.sprite.parent.add( crossM );
				crossM.point( DungeonTilemap.tileToWorld( lastTarget.pos ) );
				crossB.x = PixelScene.align( x + (width - crossB.width) / 2 );
				crossB.y = PixelScene.align( y + (height - crossB.height) / 2 );
				crossB.visible = true;
			} else {
				lastTarget = null;
			}
		}
	}
	
	public static void refresh() {
		for (int i = 0; i < instance.length; i++) {
			if (instance[i] != null) {
				instance[i].item(select(i));
			}
		}
	}
	
	public static void target( Char target ) {
		if (target != Dungeon.hero) {
			lastTarget = target;
			
			HealthIndicator.instance.target( target );
		}
	}
	
	public static void cancel() {
		if (targeting) {
			crossB.visible = false;
			crossM.remove();
			targeting = false;
		}
	}
}
