/*
 * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 *
 */

package com.sun.glass.ui.monocle;

import com.sun.glass.ui.Pixels;

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

/** Native screen implementation for the X11 platform
 *
 */
class X11Screen implements NativeScreen {

    private int depth;
    private int nativeFormat;
    private int width;
    private int height;
    private long nativeHandle;
    private long display;
    private static X xLib = X.getX();

    /** Create the screen.  If showCursor is true, set the corresponding X11
     * window attribute.
     * @param showCursor
     */
    X11Screen(boolean showCursor) {
        // Since we will be accessing X from multiple threads, we need to call
        // XInitThreads before we do anything else.  Then, lock the X display
        // until we are done doing our setup
        xLib.XInitThreads();
        display = xLib.XOpenDisplay(null);
        xLib.XLockDisplay(display);
        if (display == 0l) {
            throw new NullPointerException("Cannot open X11 display");
        }
        long screen = xLib.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 = xLib.WidthOfScreen(screen);
        int h = xLib.HeightOfScreen(screen);
        boolean fullScreen = true;
        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));
                    fullScreen = false;
                } 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));
                    fullScreen = false;
                }
            } catch (NumberFormatException e) {
                System.err.println("Cannot parse geometry string: '"
                        + geometry + "'");
            }
        }

        if (fullScreen) {
            X.XSetWindowAttributes.setOverrideRedirect(attrs.p, true);
            cwMask |= X.CWOverrideRedirect;
        }
        long window = xLib.XCreateWindow(
                display,
                xLib.RootWindowOfScreen(screen),
                x, y, w, h,
                0, // border width
                X.CopyFromParent, // depth
                X.InputOutput, // class
                X.CopyFromParent, // visual
                cwMask,
                attrs.p);
        xLib.XMapWindow(display, window);
        if (fullScreen) {
            X.XClientMessageEvent event = new X.XClientMessageEvent(
                    new X.XEvent());
            X.XEvent.setWindow(event.p, window);
            X.XClientMessageEvent.setMessageType(event.p,
                    xLib.XInternAtom(display,
                            "_NET_WM_STATE",
                            false)
            );
            X.XClientMessageEvent.setFormat(event.p, 32);
            X.XClientMessageEvent.setDataLong(event.p, 0, X._NET_WM_STATE_ADD);
            X.XClientMessageEvent.setDataLong(event.p, 1,
                    xLib.XInternAtom(display,
                            "_NET_WM_STATE_FULLSCREEN",
                            false)
            );
            X.XClientMessageEvent.setDataLong(event.p, 2, 0);
            xLib.XSendEvent(display, xLib.RootWindowOfScreen(screen),
                         false,
                         X.SubstructureRedirectMask | X.SubstructureNotifyMask,
                         event.p);
            xLib.XGrabKeyboard(display, window, true,
                            X.GrabModeAsync, X.GrabModeAsync, X.CurrentTime);
        }
        xLib.XStoreName(display, window, "JavaFX framebuffer container");
        xLib.XSync(display, false);
        int[] widthA = new int[1];
        int[] heightA = new int[1];
        int[] depthA = new int[1];
        xLib.XGetGeometry(display, window, null, null, null, widthA,
                               heightA, null, depthA);
        xLib.XUnlockDisplay(display);
        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 float getScale() {
        return 1.0f;
    }

    @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 ByteBuffer getScreenCapture() {
        return null;
    }
}
