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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.netbeans.modules.visual.action;

import org.netbeans.api.visual.action.ConnectDecorator;
import org.netbeans.api.visual.action.ConnectProvider;
import org.netbeans.api.visual.action.WidgetAction;
import org.netbeans.api.visual.action.ConnectorState;
import org.netbeans.api.visual.anchor.Anchor;
import org.netbeans.api.visual.widget.ConnectionWidget;
import org.netbeans.api.visual.widget.Scene;
import org.netbeans.api.visual.widget.Widget;

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

/**
 * Override at least isTargetWidget and createConnection methods. isSourceWidget is always called before isTargetWidget.
 *
 * @author David Kaspar
 */
public class ConnectAction extends WidgetAction.LockedAdapter {

    private static final int MIN_DIFFERENCE = 5;

    private ConnectDecorator decorator;
    private Widget interractionLayer;
    private ConnectProvider provider;

    private ConnectionWidget connectionWidget = null;
    private Widget sourceWidget = null;
    private Widget targetWidget = null;
    private Point startingPoint = null;

    public ConnectAction (ConnectDecorator decorator, Widget interractionLayer, ConnectProvider provider) {
        this.decorator = decorator;
        this.interractionLayer = interractionLayer;
        this.provider = provider;
    }

    protected boolean isLocked () {
        return sourceWidget != null;
    }

    public WidgetAction.State mousePressed (Widget widget, WidgetAction.WidgetMouseEvent event) {
        if (isLocked ())
            return WidgetAction.State.createLocked (widget, this);
        return mousePressedCore (widget, event);
    }

    protected State mousePressedCore (Widget widget, WidgetMouseEvent event) {
        if (event.getButton () == MouseEvent.BUTTON1 && event.getClickCount () == 1) {
            if (provider.isSourceWidget (widget)) {
                sourceWidget = widget;
                targetWidget = null;
                startingPoint = new Point (event.getPoint ());
                connectionWidget = decorator.createConnectionWidget (interractionLayer.getScene ());
                assert connectionWidget != null;
                connectionWidget.setSourceAnchor (decorator.createSourceAnchor (widget));
                interractionLayer.addChild (connectionWidget);
                return State.createLocked (widget, this);
            }
        }
        return State.REJECTED;
    }

    public WidgetAction.State mouseReleased (Widget widget, WidgetAction.WidgetMouseEvent event) {
        Point point = event.getPoint ();
        boolean state = move (widget, point);
        if (state) {
            if (targetWidget != null)
                if (Math.abs (startingPoint.x - point.x) >= MIN_DIFFERENCE  ||  Math.abs (startingPoint.y - point.y) >= MIN_DIFFERENCE)
                    provider.createConnection (sourceWidget, targetWidget);
            cancel ();
        }
        return state ? State.CONSUMED : State.REJECTED;
    }

    private void cancel () {
        sourceWidget = null;
        targetWidget = null;
        startingPoint = null;
        connectionWidget.setSourceAnchor (null);
        connectionWidget.setTargetAnchor (null);
        interractionLayer.removeChild (connectionWidget);
        connectionWidget = null;
    }

    public WidgetAction.State mouseDragged (Widget widget, WidgetAction.WidgetMouseEvent event) {
        return move (widget, event.getPoint ()) ? State.createLocked (widget, this) : State.REJECTED;
    }

    private boolean move (Widget widget, Point point) {
        if (sourceWidget != widget)
            return false;

        Point targetSceneLocation = widget.convertLocalToScene (point);
        targetWidget = resolveTargetWidgetCore (interractionLayer.getScene (), targetSceneLocation);
        Anchor targetAnchor = null;
        if (targetWidget != null)
            targetAnchor = decorator.createTargetAnchor (targetWidget);
        if (targetAnchor == null)
            targetAnchor = decorator.createFloatAnchor (targetSceneLocation);
        connectionWidget.setTargetAnchor (targetAnchor);

        return true;
    }

    private Widget resolveTargetWidgetCore (Scene scene, Point sceneLocation) {
        if (provider != null)
            if (provider.hasCustomTargetWidgetResolver (scene))
                return provider.resolveTargetWidget (scene, sceneLocation);
        Point sceneOrigin = scene.getLocation ();
        sceneLocation = new Point (sceneLocation.x + sceneOrigin.x, sceneLocation.y + sceneOrigin.y);
        Widget[] result = new Widget[]{null};
        resolveTargetWidgetCoreDive (result, scene, sceneLocation);
        return result[0];
    }

    private boolean resolveTargetWidgetCoreDive (Widget[] result, Widget widget, Point parentLocation) {
        if (interractionLayer.equals (widget))
            return false;
        Point widgetLocation = widget.getLocation ();
        Point location = new Point (parentLocation.x - widgetLocation.x, parentLocation.y - widgetLocation.y);

        if (! widget.getBounds ().contains (location))
            return false;

        java.util.List children = widget.getChildren ();
        for (int i = children.size () - 1; i >= 0; i --) {
            if (resolveTargetWidgetCoreDive (result, children.get (i), location))
                return true;
        }

        if (! widget.isHitAt (location))
            return false;

        ConnectorState state = provider.isTargetWidget (sourceWidget, widget);
        if (state == ConnectorState.REJECT)
            return false;
        if (state == ConnectorState.ACCEPT)
            result[0] = widget;
        return true;
    }


    public State keyPressed (Widget widget, WidgetKeyEvent event) {
        if (isLocked ()  &&  event.getKeyCode () == KeyEvent.VK_ESCAPE) {
            cancel ();
            return State.CONSUMED;
        }
        return super.keyPressed (widget, event);
    }

}