/*
 * This file is part of LibrePlan
 *
 * Copyright (C) 2009-2010 Fundación para o Fomento da Calidade Industrial e
 *                         Desenvolvemento Tecnolóxico de Galicia
 * Copyright (C) 2010-2011 Igalia, S.L.
 *
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.zkoss.ganttz;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.IOException;

import org.apache.commons.lang3.Validate;
import org.zkoss.ganttz.data.Dependency;
import org.zkoss.ganttz.data.DependencyType;
import org.zkoss.ganttz.data.GanttDate;
import org.zkoss.ganttz.data.Task;
import org.zkoss.ganttz.data.constraint.Constraint;
import org.zkoss.ganttz.data.constraint.Constraint.IConstraintViolationListener;
import org.zkoss.ganttz.util.WeakReferencedListeners.Mode;
import org.zkoss.zk.au.out.AuInvoke;
import org.zkoss.zk.ui.ext.AfterCompose;
import org.zkoss.zk.ui.sys.ContentRenderer;
import org.zkoss.zul.impl.XulElement;

/**
 *
 * @author Francisco Javier Moran Rúa <jmoran@igalia.com>
 * @author Lorenzo Tilve Álvaro <ltilve@igalia.com>
 */
public class DependencyComponent extends XulElement implements AfterCompose {

    private TaskComponent source;

    private TaskComponent destination;

    private DependencyType type;

    private Dependency dependency;

    private IConstraintViolationListener<GanttDate> violationListener;

    private PropertyChangeListener visibilityChangeListener;

    private PropertyChangeListener listener;

    private boolean violated = false;

    public DependencyComponent(TaskComponent source, TaskComponent destination, Dependency dependency) {
        Validate.notNull(dependency);
        Validate.notNull(source);
        Validate.notNull(destination);
        Validate.isTrue(source.getTask() == dependency.getSource());
        Validate.isTrue(destination.getTask() == dependency.getDestination());

        this.type = dependency.getType();
        this.source = source;
        this.destination = destination;
        this.dependency = dependency;
    }

    private void sendCSSUpdate() {
        response("constraintViolated", new AuInvoke(DependencyComponent.this, "setCSSClass", getCSSClass()));
    }

    public String getCSSClass() {
        return violated ? "violated-dependency" : "dependency";
    }

    private boolean listenerAdded = false;

    @Override
    public void afterCompose() {
        if ( listenerAdded ) {
            return;
        }

        listener = new PropertyChangeListener() {

            @Override
            public void propertyChange(PropertyChangeEvent evt) {
                redrawDependency();
            }
        };

        this.source.getTask().addFundamentalPropertiesChangeListener(listener);
        this.destination.getTask().addFundamentalPropertiesChangeListener(listener);

        violationListener = Constraint.onlyOnZKExecution(new IConstraintViolationListener<GanttDate>() {

            @Override
            public void constraintViolated(Constraint<GanttDate> constraint, GanttDate value) {
                violated = true;
                sendCSSUpdate();
            }

            @Override
            public void constraintSatisfied(Constraint<GanttDate> constraint, GanttDate value) {
                violated = false;
                sendCSSUpdate();
            }
        });

        this.dependency.addConstraintViolationListener(violationListener, Mode.RECEIVE_PENDING);

        listenerAdded = true;
    }

    public void removeChangeListeners() {
        if ( !listenerAdded ) {
            return;
        }

        this.source.getTask().removePropertyChangeListener(listener);
        this.destination.getTask().removePropertyChangeListener(listener);
        listenerAdded = false;
    }

    /**
     * @return the idTaskOrig
     */
    public String getIdTaskOrig() {
        return source.getUuid();
    }

    public void setIdTaskOrig(String idTaskOrig) {
        this.source = findTaskComponent(idTaskOrig);

    }

    private TaskComponent findTaskComponent(String idTaskOrig) {
        return (TaskComponent) getFellow(idTaskOrig);
    }

    /**
     * @return the idTaskEnd
     */
    public String getIdTaskEnd() {
        return destination.getUuid();
    }

    public void setIdTaskEnd(String idTaskEnd) {
        this.destination = findTaskComponent(idTaskEnd);
    }

    public void zoomChanged() {
        redrawDependency();
    }

    public void redrawDependency() {
        response("redrawDependency" + getId(), new AuInvoke(this, "draw"));
    }

    public boolean contains(Task task) {
        Task sourceTask = getSource().getTask();
        Task destinationTask = getDestination().getTask();

        return task.equals(sourceTask) || task.equals(destinationTask);
    }

    public TaskComponent getSource() {
        return source;
    }

    public TaskComponent getDestination() {
        return destination;
    }

    public Dependency getDependency() {
        return dependency;
    }

    public DependencyType getDependencyType() {
        return type;
    }

    public boolean hasSameSourceAndDestination(Dependency dependency) {
        Task sourceTask = source.getTask();
        Task destinationTask = destination.getTask();

        return sourceTask.equals(dependency.getSource()) && destinationTask.equals(dependency.getDestination());
    }

    protected void renderProperties(ContentRenderer renderer) throws IOException{
        super.renderProperties(renderer);

        render(renderer, "_idTaskOrig", getIdTaskOrig());
        render(renderer, "_idTaskEnd", getIdTaskEnd());
        render(renderer, "_dependencyType", getDependencyType());
    }

    public boolean hasLimitingTasks() {
        return (source.isLimiting() || destination.isLimiting());
    }

    public PropertyChangeListener getVisibilityChangeListener() {
        return visibilityChangeListener;
    }

    public void setVisibilityChangeListener(PropertyChangeListener visibilityChangeListener) {
        this.visibilityChangeListener = visibilityChangeListener;
    }

}