/*
 * Copyright (c) 2010, 2014, 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
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package com.sun.glass.ui.monocle.x11;

import com.sun.glass.ui.Pixels;
import com.sun.glass.ui.monocle.NativeScreen;
import com.sun.glass.ui.monocle.AcceleratedScreen;

import java.nio.Buffer;
import java.nio.IntBuffer;
import java.security.AccessController;
import java.security.PrivilegedAction;

public class X11Screen implements NativeScreen {

    private int depth;
    private int nativeFormat;
    private int width;
    private int height;
    private long nativeHandle;
    private long display;

    public X11Screen(boolean showCursor) {
        display = X.XOpenDisplay(null);
        if (display == 0l) {
            throw new NullPointerException("Cannot open X11 display");
        }
        long screen = X.DefaultScreenOfDisplay(display);
        X.XSetWindowAttributes attrs = new X.XSetWindowAttributes();
        attrs.setEventMask(attrs.p,
                           X.ButtonPressMask | X.ButtonReleaseMask
                                   | X.PointerMotionMask);
        long cwMask = X.CWEventMask;
        if (!showCursor) {
            cwMask |= X.CWCursorMask;
            attrs.setCursor(attrs.p, X.None);
        }
        int x = 0;
        int y = 0;
        int w = X.WidthOfScreen(screen);
        int h = X.HeightOfScreen(screen);
        String geometry = AccessController.doPrivileged((PrivilegedAction<String>) () -> System.getProperty("x11.geometry"));
        if (geometry != null) {
            try {
                String size;
                if (geometry.contains(",")) {
                    // use the first two numbers for x and y
                    String location;
                    int i = geometry.indexOf("+");
                    if (i >= 0) {
                        location = geometry.substring(0, i);
                        size = geometry.substring(i + 1);
                    } else {
                        location = geometry;
                        size = "";
                    }
                    i = location.indexOf(",");
                    x = Integer.parseInt(location.substring(0, i));
                    y = Integer.parseInt(location.substring(i + 1));
                } else {
                    size = geometry;
                }
                if (size.length() > 0) {
                    int i = size.indexOf("x");
                    w = Integer.parseInt(size.substring(0, i));
                    h = Integer.parseInt(size.substring(i + 1));
                }
            } catch (NumberFormatException e) {
                System.err.println("Cannot parse geometry string: '"
                        + geometry + "'");
            }
        }
        long window = X.XCreateWindow(
                display,
                X.RootWindowOfScreen(screen),
                x, y, w, h,
                0, // border width
                X.CopyFromParent, // depth
                X.InputOutput, // class
                X.CopyFromParent, // visual
                cwMask,
                attrs.p);
        X.XMapWindow(display, window);
        X.XStoreName(display, window, "JavaFX framebuffer container");
        X.XSync(display, false);
        int[] widthA = new int[1];
        int[] heightA = new int[1];
        int[] depthA = new int[1];
        X.XGetGeometry(display, window, null, null, null, widthA, heightA, null, depthA);
        width = widthA[0];
        height = heightA[0];
        depth = depthA[0];
        nativeFormat = Pixels.Format.BYTE_BGRA_PRE;
        nativeHandle = window;
    }

    @Override
    public int getDepth() {
        return depth;
    }

    @Override
    public int getNativeFormat() {
        return nativeFormat;
    }

    @Override
    public int getWidth() {
        return width;
    }

    @Override
    public int getHeight() {
        return height;
    }

    @Override
    public long getNativeHandle() {
        return nativeHandle;
    }

    @Override
    public int getDPI() {
        return 96;
    }

    @Override
    public void shutdown() {
    }

    long getDisplay() {
        return display;
    }

    @Override
    public void uploadPixels(Buffer b,
                             int x, int y, int width, int height,
                             float alpha) {
        // TODO: upload pixels to X11 window
    }

    @Override
    public void swapBuffers() {
    }

    @Override
    public IntBuffer getScreenCapture() {
        return null;
    }
}