/*
 * Copyright (c) 2014, grossmann
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * * Neither the name of the jo-widgets.org nor the
 *   names of its contributors may be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

package org.jowidgets.impl.dnd;

import java.util.Collection;
import java.util.Set;

import org.jowidgets.api.clipboard.TransferType;
import org.jowidgets.api.dnd.IDropEvent;
import org.jowidgets.api.dnd.IDropTarget;
import org.jowidgets.common.dnd.DropAction;
import org.jowidgets.common.dnd.DropMode;
import org.jowidgets.spi.clipboard.TransferTypeSpi;
import org.jowidgets.spi.dnd.IDropEventSpi;
import org.jowidgets.spi.dnd.IDropResponseSpi;
import org.jowidgets.spi.dnd.IDropTargetListenerSpi;
import org.jowidgets.spi.dnd.IDropTargetSpi;
import org.jowidgets.util.Assert;

public final class DropTargetImpl extends AbstractDropTargetObservable implements IDropTarget {

    private final IDropTargetSpi dropTargetSpi;
    private final IDropSelectionProvider dropSelectionProvider;
    private final IDropTargetListenerSpi dropTargetListenerSpi;
    private final DragDropDelegate dragDropDelegate;

    public DropTargetImpl(final IDropTargetSpi dropTargetSpi, final IDropSelectionProvider dropSelectionProvider) {

        Assert.paramNotNull(dropTargetSpi, "dropTargetSpi");
        Assert.paramNotNull(dropSelectionProvider, "dropSelectionProvider");

        this.dropTargetSpi = dropTargetSpi;
        this.dropSelectionProvider = dropSelectionProvider;

        this.dropTargetListenerSpi = new DropTargetListenerSpi();
        this.dragDropDelegate = new DragDropDelegate(new IDragDropSpiSupport() {

            @Override
            public void setTransferTypesSpi(final Collection<TransferTypeSpi> supportedTypes) {
                dropTargetSpi.setTransferTypes(supportedTypes);
            }

            @Override
            public void setActionsSpi(final Set<DropAction> actions) {
                dropTargetSpi.setActions(actions);
            }
        });
    }

    @Override
    public void setTransferTypes(final Collection<TransferType<?>> types) {
        dragDropDelegate.setTransferTypes(types);
    }

    @Override
    public void setTransferTypes(final TransferType<?>... supportedTypes) {
        dragDropDelegate.setTransferTypes(supportedTypes);
    }

    @Override
    public void setActions(final Set<DropAction> actions) {
        dragDropDelegate.setActions(actions);
    }

    @Override
    public void setActions(final DropAction... actions) {
        dragDropDelegate.setActions(actions);
    }

    @Override
    public void setDefaultDropMode(final DropMode dropMode) {
        dropTargetSpi.setDefaultDropMode(dropMode);
    }

    @Override
    protected void setActive(final boolean active) {
        if (active) {
            dropTargetSpi.addDropTargetListenerSpi(dropTargetListenerSpi);
        }
        else {
            dropTargetSpi.removeDropTargetListenerSpi(dropTargetListenerSpi);
        }
    }

    private final class DropTargetListenerSpi implements IDropTargetListenerSpi {

        @Override
        public void dragEnter(final IDropEventSpi event, final IDropResponseSpi response) {
            final TransferType<?> transferType = dragDropDelegate.getTransferType(event.getTransferType());
            if (transferType != null) {
                fireDragEnter(createDropEvent(event, transferType), new DropResponseImpl(response));
            }
        }

        @Override
        public void dragOver(final IDropEventSpi event, final IDropResponseSpi response) {
            final TransferType<?> transferType = dragDropDelegate.getTransferType(event.getTransferType());
            if (transferType != null) {
                fireDragOver(createDropEvent(event, transferType), new DropResponseImpl(response));
            }
        }

        @Override
        public void dragOperationChanged(final IDropEventSpi event, final IDropResponseSpi response) {
            final TransferType<?> transferType = dragDropDelegate.getTransferType(event.getTransferType());
            if (transferType != null) {
                fireDragOperationChanged(createDropEvent(event, transferType), new DropResponseImpl(response));
            }
        }

        @Override
        public void dragExit() {
            fireDragExit();
        }

        @Override
        public void dropAccept(final IDropEventSpi event, final IDropResponseSpi response) {
            final TransferType<?> transferType = dragDropDelegate.getTransferType(event.getTransferType());
            if (transferType != null) {
                fireDropAccept(createDropEvent(event, transferType), new DropResponseImpl(response));
            }
        }

        @Override
        public void drop(final IDropEventSpi event) {
            final TransferType<?> transferType = dragDropDelegate.getTransferType(event.getTransferType());
            if (transferType != null) {
                fireDrop(createDropEvent(event, transferType));
            }
        }

        private IDropEvent createDropEvent(final IDropEventSpi dropEventSpi, final TransferType<?> transferType) {
            return new DropEventImpl(
                dropEventSpi,
                dropSelectionProvider.getDropSelection(dropEventSpi.getDropSelection()),
                transferType);
        }

    }

}