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/*
 * Scenic View,
 * Copyright (C) 2012 Jonathan Giles, Ander Ruiz, Amy Fowler
 *
 * 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 .
 */
package org.fxconnector;

import javafx.beans.InvalidationListener;
import javafx.beans.value.ObservableValue;
import org.scenicview.utils.ExceptionLogger;

import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

@SuppressWarnings("rawtypes")
public abstract class PropertyTracker {

	final Map properties = new HashMap<>();
	private final InvalidationListener propListener;

	public PropertyTracker() {
		propListener = property -> updateDetail(properties.get(property), (ObservableValue) property);
	}

	protected abstract void updateDetail(String string, ObservableValue property);

	public void clear() {
		for (final ObservableValue ov : properties.keySet()) {
			if (ov != null && propListener != null) {
				ov.removeListener(propListener);
			}
		}
		properties.clear();
	}

	public void setTarget(final Object target) {
		properties.clear();
		// Using reflection, locate all properties and their corresponding
		// property references
		for (final Method method : target.getClass().getMethods()) {
			if (method.getName().endsWith("Property")) {
				try {
					final Class returnType = method.getReturnType();
					if (ObservableValue.class.isAssignableFrom(returnType)) {
						// we've got a winner
						final String propertyName = method.getName().substring(0, method.getName().lastIndexOf("Property"));
						// Request access
						method.setAccessible(true);
						final ObservableValue property = (ObservableValue) method.invoke(target);
						properties.put(property, propertyName);
					}
				} catch (final Exception e) {
					ExceptionLogger.submitException(e, "Failed to get property " + method.getName());
				}
			}
		}

		for (final ObservableValue ov : properties.keySet()) {
			if (ov != null && propListener != null) {
				ov.addListener(propListener);
			}
		}
	}

	public Map getProperties() {
		return properties;
	}

}