/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#if !defined WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>

#if defined _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4201) /* nonstandard extension used: nameless struct/union */
#endif
#include <jawt_md.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif

#define SYSTEM_WIN32   1

#define OLD_PROC_KEY L"oldwindowproc"

static LRESULT APIENTRY OpenOfficeWndProc( HWND , UINT , WPARAM , LPARAM );

/* type must be something like java/lang/RuntimeException
 */
static void ThrowException(JNIEnv * env, char const * type, char const * msg) {
    jclass c;
    (*env)->ExceptionClear(env);
    c = (*env)->FindClass(env, type);
    if (c == NULL) {
        (*env)->ExceptionClear(env);
        (*env)->FatalError(
            env, "JNI FindClass failed");
    }
    if ((*env)->ThrowNew(env, c, msg) != 0) {
        (*env)->ExceptionClear(env);
        (*env)->FatalError(env, "JNI ThrowNew failed");
    }
}


/*****************************************************************************/
/*
 * Class:     com_sun_star_comp_beans_LocalOfficeWindow
 * Method:    getNativeWindowSystemType
 * Signature: ()I
 */
JNIEXPORT jint JNICALL Java_com_sun_star_comp_beans_LocalOfficeWindow_getNativeWindowSystemType
  (JNIEnv * env, jobject obj_this)
{
    (void) env; // unused
    (void) obj_this; // unused
    return SYSTEM_WIN32;
}


/*****************************************************************************/
/*
 * Class:     com_sun_star_comp_beans_LocalOfficeWindow
 * Method:    getNativeWindow
 * Signature: ()J
 */
JNIEXPORT jlong JNICALL Java_com_sun_star_comp_beans_LocalOfficeWindow_getNativeWindow
  (JNIEnv * env, jobject obj_this)
{
    jboolean result;
    jint lock;

    JAWT awt;
    JAWT_DrawingSurface* ds;
    JAWT_DrawingSurfaceInfo* dsi;
    JAWT_Win32DrawingSurfaceInfo* dsi_win;
    HWND hWnd;
    LONG_PTR hFuncPtr;

    /* Get the AWT */
    awt.version = JAWT_VERSION_1_3;
    result = JAWT_GetAWT(env, &awt);
    if (result == JNI_FALSE)
        ThrowException(env, "java/lang/RuntimeException", "JAWT_GetAWT failed");

                                /* Get the drawing surface */
    if ((ds = awt.GetDrawingSurface(env, obj_this)) == NULL)
        return 0L;

    /* Lock the drawing surface */
    lock = ds->Lock(ds);
    if ( (lock & JAWT_LOCK_ERROR) != 0)
        ThrowException(env, "java/lang/RuntimeException",
                       "Could not get AWT drawing surface.");

    /* Get the drawing surface info */
    dsi = ds->GetDrawingSurfaceInfo(ds);

    /* Get the platform-specific drawing info */
    dsi_win = (JAWT_Win32DrawingSurfaceInfo*)dsi->platformInfo;

    hWnd = dsi_win->hwnd;

    /* Free the drawing surface info */
    ds->FreeDrawingSurfaceInfo(dsi);
    /* Unlock the drawing surface */
    ds->Unlock(ds);
    /* Free the drawing surface */
    awt.FreeDrawingSurface(ds);

    /* Register own window procedure
       Do it one times only! Otherwise
       multiple instances will be registered
       and calls on such construct produce
       a stack overflow.
     */
    if (GetPropW( hWnd, OLD_PROC_KEY )==NULL)
    {
        hFuncPtr = SetWindowLongPtrW( hWnd, GWLP_WNDPROC, (LONG_PTR)OpenOfficeWndProc );
        SetPropW( hWnd, OLD_PROC_KEY, (HANDLE)hFuncPtr );
    }

    return (jlong)hWnd;
}


static LRESULT APIENTRY OpenOfficeWndProc(
    HWND hWnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam)
{
    switch(uMsg)
    {
        case WM_PARENTNOTIFY: {
            if (wParam == WM_CREATE) {
                RECT rect;
                HWND hChild = (HWND) lParam;

                GetClientRect(hWnd, &rect);

                SetWindowPos(hChild,
                             NULL,
                             rect.left,
                             rect.top,
                             rect.right - rect.left,
                             rect.bottom - rect.top,
                             SWP_NOZORDER);
            }
            break;
        }
        case WM_SIZE: {
            WORD newHeight = HIWORD(lParam);
            WORD newWidth = LOWORD(lParam);
            HWND hChild = GetWindow(hWnd, GW_CHILD);

            if (hChild != NULL) {
                SetWindowPos(hChild, NULL, 0, 0, newWidth, newHeight, SWP_NOZORDER);
            }
            break;
        }
    }

#if defined _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4152) /* function/data pointer conversion: */
#endif
    return CallWindowProcW(GetPropW(hWnd, OLD_PROC_KEY),
                          hWnd, uMsg, wParam, lParam);
#if defined _MSC_VER
#pragma warning(pop)
#endif
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */