/*******************************************************************************
 * This file is part of logisim-evolution.
 *
 *   logisim-evolution 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.
 *
 *   logisim-evolution 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 logisim-evolution.  If not, see <http://www.gnu.org/licenses/>.
 *
 *   Original code by Carl Burch (http://www.cburch.com), 2011.
 *   Subsequent modifications by :
 *     + Haute École Spécialisée Bernoise
 *       http://www.bfh.ch
 *     + Haute École du paysage, d'ingénierie et d'architecture de Genève
 *       http://hepia.hesge.ch/
 *     + Haute École d'Ingénierie et de Gestion du Canton de Vaud
 *       http://www.heig-vd.ch/
 *   The project is currently maintained by :
 *     + REDS Institute - HEIG-VD
 *       Yverdon-les-Bains, Switzerland
 *       http://reds.heig-vd.ch
 *******************************************************************************/

package com.cburch.logisim.instance;

import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.cburch.logisim.circuit.CircuitState;
import com.cburch.logisim.comp.ComponentDrawContext;
import com.cburch.logisim.comp.ComponentUserEvent;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.gui.main.Canvas;
import com.cburch.logisim.tools.AbstractCaret;
import com.cburch.logisim.tools.Caret;
import com.cburch.logisim.tools.Pokable;

class InstancePokerAdapter extends AbstractCaret implements Pokable {

	final static Logger logger = LoggerFactory
			.getLogger(InstancePokerAdapter.class);

	private InstanceComponent comp;
	private Canvas canvas;
	private InstancePoker poker;
	private InstanceStateImpl state;
	private ComponentDrawContext context;

	public InstancePokerAdapter(InstanceComponent comp,
			Class<? extends InstancePoker> pokerClass) {
		try {
			this.comp = comp;
			poker = pokerClass.newInstance();
		} catch (Exception t) {
			handleError(t, pokerClass);
			poker = null;
		}
	}

	private void checkCurrent() {
		if (state != null && canvas != null) {
			CircuitState s0 = state.getCircuitState();
			CircuitState s1 = canvas.getCircuitState();
			if (s0 != s1) {
				state = new InstanceStateImpl(s1, comp);
			}
		}
	}

	@Override
	public void draw(Graphics g) {
		if (poker != null) {
			context.setGraphics(g);
			InstancePainter painter = new InstancePainter(context, comp);
			poker.paint(painter);
		}
	}

	@Override
	public Bounds getBounds(Graphics g) {
		if (poker != null) {
			context.setGraphics(g);
			InstancePainter painter = new InstancePainter(context, comp);
			return poker.getBounds(painter);
		} else {
			return Bounds.EMPTY_BOUNDS;
		}
	}

	public Caret getPokeCaret(ComponentUserEvent event) {
		if (poker == null) {
			return null;
		} else {
			canvas = event.getCanvas();
			CircuitState circState = event.getCircuitState();
			InstanceStateImpl state = new InstanceStateImpl(circState, comp);
			MouseEvent e = new MouseEvent(event.getCanvas(),
					MouseEvent.MOUSE_PRESSED, System.currentTimeMillis(), 0,
					event.getX(), event.getY(), 1, false);
			boolean isAccepted = poker.init(state, e);
			if (isAccepted) {
				this.state = state;
				this.context = new ComponentDrawContext(event.getCanvas(),
						event.getCanvas().getCircuit(), circState, null, null);
				mousePressed(e);
				return this;
			} else {
				poker = null;
				return null;
			}
		}
	}

	private void handleError(Throwable t,
			Class<? extends InstancePoker> pokerClass) {
		String className = pokerClass.getName();
		logger.error("Error while instantiating poker {}: {}", className, t
				.getClass().getName());
		String msg = t.getMessage();
		if (msg != null)
			logger.error("  ({})", msg); // OK
	}

	@Override
	public void keyPressed(KeyEvent e) {
		if (poker != null) {
			poker.keyPressed(state, e);
			checkCurrent();
		}
	}

	@Override
	public void keyReleased(KeyEvent e) {
		if (poker != null) {
			poker.keyReleased(state, e);
			checkCurrent();
		}
	}

	@Override
	public void keyTyped(KeyEvent e) {
		if (poker != null) {
			poker.keyTyped(state, e);
			checkCurrent();
		}
	}

	@Override
	public void mouseDragged(MouseEvent e) {
		if (poker != null) {
			poker.mouseDragged(state, e);
			checkCurrent();
		}
	}

	@Override
	public void mousePressed(MouseEvent e) {
		if (poker != null) {
			poker.mousePressed(state, e);
			checkCurrent();
		}
	}

	@Override
	public void mouseReleased(MouseEvent e) {
		if (poker != null) {
			poker.mouseReleased(state, e);
			checkCurrent();
		}
	}

	@Override
	public void stopEditing() {
		if (poker != null) {
			poker.stopEditing(state);
			checkCurrent();
		}
	}
}