/*
 * Copyright (c) 2010, 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
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 */
package com.sun.glass.ui.gtk;

import com.sun.glass.ui.Pixels;
import com.sun.glass.ui.View;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import java.util.Map;

final class GtkView extends View {
    
    private boolean imEnabled = false;
    private StringBuilder preedit = new StringBuilder();
    private int lastCaret;

    private native void enableInputMethodEventsImpl(long ptr, boolean enable);

    @Override
    protected void _enableInputMethodEvents(long ptr, boolean enable) {
        enableInputMethodEventsImpl(ptr, enable);
        if (imEnabled) {
            preedit.setLength(0);
        }
        imEnabled = enable;
    }

    @Override
    protected native long _create(Map caps);

    @Override
    protected native long _getNativeView(long ptr);

    @Override
    protected native int _getX(long ptr);

    @Override
    protected native int _getY(long ptr);

    @Override
    protected native void _setParent(long ptr, long parentPtr);

    @Override
    protected native boolean _close(long ptr);

    @Override
    protected native void _scheduleRepaint(long ptr);

    @Override
    protected void _begin(long ptr) {}

    @Override
    protected void _end(long ptr) {}

    @Override 
    protected void _uploadPixels(long ptr, Pixels pixels) {
        Buffer data = pixels.getPixels();
        if (data.isDirect() == true) {
            _uploadPixelsDirect(ptr, data, pixels.getWidth(), pixels.getHeight());
        } else if (data.hasArray() == true) {
            if (pixels.getBytesPerComponent() == 1) {
                ByteBuffer bytes = (ByteBuffer)data;
                _uploadPixelsByteArray(ptr, bytes.array(), bytes.arrayOffset(), pixels.getWidth(), pixels.getHeight());
            } else {
                IntBuffer ints = (IntBuffer)data;
                _uploadPixelsIntArray(ptr, ints.array(), ints.arrayOffset(), pixels.getWidth(), pixels.getHeight());
            }
        } else {
            // gznote: what are the circumstances under which this can happen?
            _uploadPixelsDirect(ptr, pixels.asByteBuffer(), pixels.getWidth(), pixels.getHeight());
        }
    }
    private native void _uploadPixelsDirect(long viewPtr, Buffer pixels, int width, int height);
    private native void _uploadPixelsByteArray(long viewPtr, byte[] pixels, int offset, int width, int height);
    private native void _uploadPixelsIntArray(long viewPtr, int[] pixels, int offset, int width, int height);

    @Override
    protected native boolean _enterFullscreen(long ptr, boolean animate, boolean keepRatio, boolean hideCursor);

    @Override
    protected native void _exitFullscreen(long ptr, boolean animate);
    
    @Override protected void _finishInputMethodComposition(long ptr) {
        if (imEnabled) {
            // Discard any pre-edited text
            preedit.setLength(0);
            notifyInputMethod(preedit.toString(), null, null, null, 0, 0, 0);
        }
    }

    protected void notifyInputMethodDraw(String text, int first, int length, int caret) {
        if (text != null) {
            preedit.replace(first, first + length, text);
        } else {
            preedit.setLength(0);
        }
        notifyInputMethod(preedit.toString(), null, null, null, 0, caret, 0);
        lastCaret = caret;
    }
    
    protected void notifyInputMethodCaret(int pos, int direction, int style) {
        switch (direction) {
            case 0: //XIMForwardChar
                lastCaret += pos;
                break;
            case 1: //XIMBackwardChar
                lastCaret -= pos;
                break;
            case 10: //XIMAbsolute
                lastCaret = pos;
                break;
            default:
                //TODO: as we don't know the text structure, we cannot compute the position
                // for other directions (like forward words, lines, etc...).
                // Luckily, vast majority of IM uses XIMAbsolute (10)
        }
        notifyInputMethod(preedit.toString(), null, null, null, 0, lastCaret, 0);
    }
}