package com.vaadin.tests.dd;

import java.util.Collection;

import com.vaadin.data.Item;
import com.vaadin.data.util.HierarchicalContainer;
import com.vaadin.event.DataBoundTransferable;
import com.vaadin.event.Transferable;
import com.vaadin.event.dd.DragAndDropEvent;
import com.vaadin.event.dd.DropHandler;
import com.vaadin.event.dd.acceptcriteria.AcceptCriterion;
import com.vaadin.event.dd.acceptcriteria.Or;
import com.vaadin.server.VaadinRequest;
import com.vaadin.shared.ui.dd.VerticalDropLocation;
import com.vaadin.tests.components.AbstractTestUI;
import com.vaadin.ui.AbstractSelect;
import com.vaadin.ui.Tree;
import com.vaadin.ui.Tree.TreeDragMode;
import com.vaadin.ui.Tree.TreeTargetDetails;

/**
 * DD playground. Better quality example/prototype codes in {@link DDTest2}.
 */
public class DDTest8 extends AbstractTestUI {

    @Override
    protected void setup(VaadinRequest request) {
        final Tree tree = new Tree(
                "Tree with criteria from AbstractSelect (OverItem, ContainsItem). Foo can be dragged anywhere, anything can be dropped on Foo or Bar. Bar5 subtree is also valid drop target.");

        final HierarchicalContainer container = new HierarchicalContainer();
        tree.setContainerDataSource(container);
        tree.addItem("Foo");
        tree.addItem("Bar");
        tree.addItem("Bar1");
        tree.addItem("Bar2");
        tree.addItem("Bar3");
        tree.addItem("Bar4");
        tree.addItem("Bar5");
        tree.addItem("Child");
        tree.setParent("Child", "Foo");
        tree.setSizeFull();
        tree.setDragMode(TreeDragMode.NODE);
        tree.setDropHandler(getDropHandler(tree, container));

        getLayout().setSizeFull();
        getLayout().getParent().setSizeFull();
        addComponent(tree);
    }

    /**
     * Moves items in tree (and could work in Table too). Also supports
     * "building" tree.
     * 
     * TODO fix algorithm, broken in some cases.
     * 
     * @param tree
     * @param container
     * @return drop handler
     */
    private DropHandler getDropHandler(final Tree tree,
            final HierarchicalContainer container) {
        return new DropHandler() {

            @SuppressWarnings({ "unused", "unchecked" })
            private void populateSubTree(HierarchicalContainer idx,
                    HierarchicalContainer subtree, Object itemId) {
                Collection<?> children = subtree.getChildren(itemId);
                if (children != null) {

                    for (Object childId : children) {
                        Item addItem = idx.addItem(childId);
                        if (addItem != null) {
                            // did not exist, populate properties
                            Item item = subtree.getItem(itemId);
                            Collection<?> itemPropertyIds = item
                                    .getItemPropertyIds();
                            for (Object propId : itemPropertyIds) {
                                addItem.getItemProperty(propId)
                                        .setValue(
                                                item.getItemProperty(propId)
                                                        .getValue());
                            }
                        }
                        idx.setParent(childId, itemId);
                        populateSubTree(idx, subtree, childId);
                    }
                }

            }

            @SuppressWarnings("unused")
            private HierarchicalContainer getSubTree(HierarchicalContainer idx,
                    Object itemId) {
                HierarchicalContainer hierarchicalContainer = new HierarchicalContainer();
                Collection<?> containerPropertyIds = idx
                        .getContainerPropertyIds();
                for (Object object : containerPropertyIds) {
                    hierarchicalContainer.addContainerProperty(object,
                            idx.getType(object), null);
                }
                hierarchicalContainer.addItem(itemId);
                copyChildren(idx, hierarchicalContainer, itemId);
                return hierarchicalContainer;
            }

            @SuppressWarnings("unchecked")
            private void copyChildren(HierarchicalContainer source,
                    HierarchicalContainer target, Object itemId) {
                Collection<?> children = source.getChildren(itemId);
                if (children != null) {
                    for (Object childId : children) {
                        Item item = source.getItem(childId);
                        Item addedItem = target.addItem(childId);
                        target.setParent(childId, itemId);
                        Collection<?> itemPropertyIds = item
                                .getItemPropertyIds();
                        for (Object propertyId : itemPropertyIds) {
                            addedItem.getItemProperty(propertyId)
                                    .setValue(
                                            item.getItemProperty(propertyId)
                                                    .getValue());
                        }
                        copyChildren(source, target, childId);
                    }
                }

            }

            @Override
            public void drop(DragAndDropEvent event) {
                TreeTargetDetails details = (TreeTargetDetails) event
                        .getTargetDetails();
                // TODO set properties, so same sorter could be used in Table
                Transferable transferable = event.getTransferable();
                if (transferable instanceof DataBoundTransferable) {
                    DataBoundTransferable transferrable2 = (DataBoundTransferable) transferable;

                    Object itemId = transferrable2.getItemId();

                    Object itemIdOver = details.getItemIdOver();

                    // TODO could use the "folder" node id to make the drop
                    // logic simpler
                    Object itemIdInto = details.getItemIdInto();
                    VerticalDropLocation dropLocation = details
                            .getDropLocation();

                    Object itemIdAfter = details.getItemIdAfter();

                    if (itemIdOver.equals(itemIdInto)) { // directly on a node
                        container.setParent(itemId, itemIdOver);
                        return;
                    }

                    container.setParent(itemId, itemIdInto);

                    if (dropLocation == null) {
                        System.err.println("No detail of drop place available");
                    }
                    container.moveAfterSibling(itemId, itemIdAfter);
                }

                return;
            }

            @Override
            public AcceptCriterion getAcceptCriterion() {
                return new Or(new AbstractSelect.TargetItemIs(tree, "Foo",
                        "Bar"), new AbstractSelect.AcceptItem(tree, "Foo"),
                        tree.new TargetInSubtree("Bar5") //
                );
            }

        };
    }

    @Override
    protected String getTestDescription() {
        return "Random DD tests";
    }

    @Override
    protected Integer getTicketNumber() {
        return 119;
    }

}