/*

 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.lwawt;

import sun.awt.SunGraphicsCallback;

import sun.java2d.pipe.Region;

import java.awt.Color;

import java.awt.Container;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.Insets;

import java.awt.Rectangle;

import java.awt.peer.ContainerPeer;

import java.util.LinkedList;

import java.util.List;

import javax.swing.JComponent;

abstract class LWContainerPeer<T extends Container, D extends JComponent>

        extends LWCanvasPeer<T, D> implements ContainerPeer {

    /**

     * List of child peers sorted by z-order from bottom-most to top-most.

     */

    private final List<LWComponentPeer<?, ?>> childPeers = new LinkedList<>();

    LWContainerPeer(final T target, final PlatformComponent platformComponent) {

        super(target, platformComponent);

    }

    final void addChildPeer(final LWComponentPeer<?, ?> child) {

        synchronized (getPeerTreeLock()) {

            childPeers.add(childPeers.size(), child);

            // TODO: repaint

        }

    }

    final void removeChildPeer(final LWComponentPeer<?, ?> child) {

        synchronized (getPeerTreeLock()) {

            childPeers.remove(child);

        }

        // TODO: repaint

    }

    // Used by LWComponentPeer.setZOrder()

    final void setChildPeerZOrder(final LWComponentPeer<?, ?> peer,

                                  final LWComponentPeer<?, ?> above) {

        synchronized (getPeerTreeLock()) {

            childPeers.remove(peer);

            int index = (above != null) ? childPeers.indexOf(above) : childPeers.size();

            if (index >= 0) {

                childPeers.add(index, peer);

            } else {

                // TODO: log

            }

        }

        // TODO: repaint

    }

    // ---- PEER METHODS ---- //

    /*

     * Overridden in LWWindowPeer.

     */

    @Override

    public Insets getInsets() {

        return new Insets(0, 0, 0, 0);

    }

    @Override

    public final void beginValidate() {

        // TODO: it seems that begin/endValidate() is only useful

        // for heavyweight windows, when a batch movement for

        // child windows  occurs. That's why no-op

    }

    @Override

    public final void endValidate() {

        // TODO: it seems that begin/endValidate() is only useful

        // for heavyweight windows, when a batch movement for

        // child windows  occurs. That's why no-op

    }

    @Override

    public final void beginLayout() {

        // Skip all painting till endLayout()

        setLayouting(true);

    }

    @Override

    public final void endLayout() {

        setLayouting(false);

        // Post an empty event to flush all the pending target paints

        postPaintEvent(0, 0, 0, 0);

    }

    // ---- PEER NOTIFICATIONS ---- //

    /**

     * Returns a copy of the childPeer collection.

     */

    @SuppressWarnings("unchecked")

    final List<LWComponentPeer<?, ?>> getChildren() {

        synchronized (getPeerTreeLock()) {

            Object copy = ((LinkedList<?>) childPeers).clone();

            return (List<LWComponentPeer<?, ?>>) copy;

        }

    }

    @Override

    final Region getVisibleRegion() {

        return cutChildren(super.getVisibleRegion(), null);

    }

    /**

     * Removes bounds of children above specific child from the region. If above

     * is null removes all bounds of children.

     */

    final Region cutChildren(Region r, final LWComponentPeer<?, ?> above) {

        boolean aboveFound = above == null;

        for (final LWComponentPeer<?, ?> child : getChildren()) {

            if (!aboveFound && child == above) {

                aboveFound = true;

                continue;

            }

            if (aboveFound) {

                if(child.isVisible()){

                    final Rectangle cb = child.getBounds();

                    final Region cr = child.getRegion();

                    final Region tr = cr.getTranslatedRegion(cb.x, cb.y);

                    r = r.getDifference(tr.getIntersection(getContentSize()));

                }

            }

        }

        return r;

    }

    // ---- UTILITY METHODS ---- //

    /**

     * Finds a top-most visible component for the given point. The location is

     * specified relative to the peer's parent.

     */

    @Override

    final LWComponentPeer<?, ?> findPeerAt(int x, int y) {

        LWComponentPeer<?, ?> peer = super.findPeerAt(x, y);

        final Rectangle r = getBounds();

        // Translate to this container's coordinates to pass to children

        x -= r.x;

        y -= r.y;

        if (peer != null && getContentSize().contains(x, y)) {

            synchronized (getPeerTreeLock()) {

                for (int i = childPeers.size() - 1; i >= 0; --i) {

                    LWComponentPeer<?, ?> p = childPeers.get(i).findPeerAt(x, y);

                    if (p != null) {

                        peer = p;

                        break;

                    }

                }

            }

        }

        return peer;

    }

    /*

    * Called by the container when any part of this peer or child

    * peers should be repainted

    */

    @Override

    final void repaintPeer(final Rectangle r) {

        final Rectangle toPaint = getSize().intersection(r);

        if (!isShowing() || toPaint.isEmpty()) {

            return;

        }

        // First, post the PaintEvent for this peer

        super.repaintPeer(toPaint);

        // Second, handle all the children

        // Use the straight order of children, so the bottom

        // ones are painted first

        repaintChildren(toPaint);

    }

    /**

     * Paints all the child peers in the straight z-order, so the

     * bottom-most ones are painted first.

     */

    private void repaintChildren(final Rectangle r) {

        final Rectangle content = getContentSize();

        for (final LWComponentPeer<?, ?> child : getChildren()) {

            final Rectangle childBounds = child.getBounds();

            Rectangle toPaint = r.intersection(childBounds);

            toPaint = toPaint.intersection(content);

            toPaint.translate(-childBounds.x, -childBounds.y);

            child.repaintPeer(toPaint);

        }

    }

    Rectangle getContentSize() {

        return getSize();

    }

    @Override

    public void setEnabled(final boolean e) {

        super.setEnabled(e);

        for (final LWComponentPeer<?, ?> child : getChildren()) {

            child.setEnabled(e && child.getTarget().isEnabled());

        }

    }

    @Override

    public void setBackground(final Color c) {

        for (final LWComponentPeer<?, ?> child : getChildren()) {

            if (!child.getTarget().isBackgroundSet()) {

                child.setBackground(c);

            }

        }

        super.setBackground(c);

    }

    @Override

    public void setForeground(final Color c) {

        for (final LWComponentPeer<?, ?> child : getChildren()) {

            if (!child.getTarget().isForegroundSet()) {

                child.setForeground(c);

            }

        }

        super.setForeground(c);

    }

    @Override

    public void setFont(final Font f) {

        for (final LWComponentPeer<?, ?> child : getChildren()) {

            if (!child.getTarget().isFontSet()) {

                child.setFont(f);

            }

        }

        super.setFont(f);

    }

    @Override

    public final void paint(final Graphics g) {

        super.paint(g);

        SunGraphicsCallback.PaintHeavyweightComponentsCallback.getInstance()

                .runComponents(getTarget().getComponents(), g,

                               SunGraphicsCallback.LIGHTWEIGHTS

                               | SunGraphicsCallback.HEAVYWEIGHTS);

    }

    @Override

    public final void print(final Graphics g) {

        super.print(g);

        SunGraphicsCallback.PrintHeavyweightComponentsCallback.getInstance()

                .runComponents(getTarget().getComponents(), g,

                               SunGraphicsCallback.LIGHTWEIGHTS

                               | SunGraphicsCallback.HEAVYWEIGHTS);

    }

}