/* -*- 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 .
 */

#include "svsys.h"
#include "rtl/ustrbuf.hxx"

#include "tools/debug.hxx"

#include "vcl/window.hxx"

#include "win/salsys.h"
#include "win/salframe.h"
#include "win/salinst.h"
#include "win/saldata.hxx"

#include "svdata.hxx"

#include <unordered_map>

SalSystem* WinSalInstance::CreateSalSystem()
{
    return new WinSalSystem();
}

WinSalSystem::~WinSalSystem()
{
}

static BOOL CALLBACK ImplEnumMonitorProc( HMONITOR hMonitor,
                                          HDC hDC,
                                          LPRECT lpRect,
                                          LPARAM dwData )
{
    WinSalSystem* pSys = reinterpret_cast<WinSalSystem*>(dwData);
    return pSys->handleMonitorCallback( reinterpret_cast<sal_IntPtr>(hMonitor),
                                        reinterpret_cast<sal_IntPtr>(hDC),
                                        reinterpret_cast<sal_IntPtr>(lpRect) );
}

bool WinSalSystem::handleMonitorCallback( sal_IntPtr hMonitor, sal_IntPtr, sal_IntPtr )
{
    MONITORINFOEXW aInfo;
    aInfo.cbSize = sizeof( aInfo );
    if( GetMonitorInfoW( reinterpret_cast<HMONITOR>(hMonitor), &aInfo ) )
    {
        aInfo.szDevice[CCHDEVICENAME-1] = 0;
        OUString aDeviceName( reinterpret_cast<const sal_Unicode *>(aInfo.szDevice) );
        std::map< OUString, unsigned int >::const_iterator it =
            m_aDeviceNameToMonitor.find( aDeviceName );
        if( it != m_aDeviceNameToMonitor.end() )
        {
            DisplayMonitor& rMon( m_aMonitors[ it->second ] );
            rMon.m_aArea = Rectangle( Point( aInfo.rcMonitor.left,
                                             aInfo.rcMonitor.top ),
                                      Size( aInfo.rcMonitor.right - aInfo.rcMonitor.left,
                                            aInfo.rcMonitor.bottom - aInfo.rcMonitor.top ) );
            if( (aInfo.dwFlags & MONITORINFOF_PRIMARY) != 0 )
                m_nPrimary = it->second;
        }
    }
    return true;
}

void WinSalSystem::clearMonitors()
{
    m_aMonitors.clear();
    m_nPrimary = 0;
}

bool WinSalSystem::initMonitors()
{
    if( m_aMonitors.size() > 0 )
        return true;

    int nMonitors = GetSystemMetrics( SM_CMONITORS );
    if( nMonitors == 1 )
    {
        int w = GetSystemMetrics( SM_CXSCREEN );
        int h = GetSystemMetrics( SM_CYSCREEN );
        m_aMonitors.push_back( DisplayMonitor( OUString(),
                                               OUString(),
                                               Rectangle( Point(), Size( w, h ) ),
                                               0 ) );
        m_aDeviceNameToMonitor[ OUString() ] = 0;
        m_nPrimary = 0;
    }
    else
    {
        DISPLAY_DEVICEW aDev;
        aDev.cb = sizeof( aDev );
        DWORD nDevice = 0;
        std::unordered_map< OUString, int, OUStringHash > aDeviceStringCount;
        while( EnumDisplayDevicesW( NULL, nDevice++, &aDev, 0 ) )
        {
            if( (aDev.StateFlags & DISPLAY_DEVICE_ACTIVE)
                && !(aDev.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER) ) // sort out non/disabled monitors
            {
                aDev.DeviceName[31] = 0;
                aDev.DeviceString[127] = 0;
                OUString aDeviceName( reinterpret_cast<const sal_Unicode *>(aDev.DeviceName) );
                OUString aDeviceString( reinterpret_cast<const sal_Unicode *>(aDev.DeviceString) );
                if( aDeviceStringCount.find( aDeviceString ) == aDeviceStringCount.end() )
                    aDeviceStringCount[ aDeviceString ] = 1;
                else
                    aDeviceStringCount[ aDeviceString ]++;
                m_aDeviceNameToMonitor[ aDeviceName ] = m_aMonitors.size();
                m_aMonitors.push_back( DisplayMonitor( aDeviceString,
                                                       aDeviceName,
                                                       Rectangle(),
                                                       aDev.StateFlags ) );
            }
        }
        HDC aDesktopRC = GetDC( NULL );
        EnumDisplayMonitors( aDesktopRC, NULL, ImplEnumMonitorProc, reinterpret_cast<LPARAM>(this) );

        // append monitor numbers to name strings
        std::unordered_map< OUString, int, OUStringHash > aDevCount( aDeviceStringCount );
        unsigned int nMonitorCount = m_aMonitors.size();
        for( unsigned int i = 0; i < nMonitorCount; i++ )
        {
            const OUString& rDev( m_aMonitors[i].m_aName );
            if( aDeviceStringCount[ rDev ] > 1 )
            {
                int nInstance = aDeviceStringCount[ rDev ] - (-- aDevCount[ rDev ] );
                OUStringBuffer aBuf( rDev.getLength() + 8 );
                aBuf.append( rDev );
                aBuf.appendAscii( " (" );
                aBuf.append( sal_Int32( nInstance ) );
                aBuf.append( ')' );
                m_aMonitors[ i ].m_aName = aBuf.makeStringAndClear();
            }
        }
    }

    return m_aMonitors.size() > 0;
}

unsigned int WinSalSystem::GetDisplayScreenCount()
{
    initMonitors();
    return m_aMonitors.size();
}

unsigned int WinSalSystem::GetDisplayBuiltInScreen()
{
    initMonitors();
    return m_nPrimary;
}

Rectangle WinSalSystem::GetDisplayScreenPosSizePixel( unsigned int nScreen )
{
    initMonitors();
    return (nScreen < m_aMonitors.size()) ? m_aMonitors[nScreen].m_aArea : Rectangle();
}

/* We have to map the button identifier to the identifier used by the Win32
   Platform SDK to specify the default button for the MessageBox API.
   The first dimension is the button combination, the second dimension
   is the button identifier.
*/
static const int DEFAULT_BTN_MAPPING_TABLE[][8] =
{
    //  Undefined        OK             CANCEL         ABORT          RETRY          IGNORE         YES             NO
    { MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1 }, //OK
    { MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON2, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1 }, //OK_CANCEL
    { MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON2, MB_DEFBUTTON3, MB_DEFBUTTON1, MB_DEFBUTTON1 }, //ABORT_RETRY_IGNO
    { MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON3, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON2 }, //YES_NO_CANCEL
    { MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON2 }, //YES_NO
    { MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON2, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1, MB_DEFBUTTON1 }  //RETRY_CANCEL
};

int WinSalSystem::ShowNativeMessageBox(const OUString& rTitle, const OUString& rMessage, int nButtonCombination, int nDefaultButton, SAL_UNUSED_PARAMETER bool)
{
    DBG_ASSERT( nButtonCombination >= SALSYSTEM_SHOWNATIVEMSGBOX_BTNCOMBI_OK &&
                nButtonCombination <= SALSYSTEM_SHOWNATIVEMSGBOX_BTNCOMBI_RETRY_CANCEL &&
                nDefaultButton >= SALSYSTEM_SHOWNATIVEMSGBOX_BTN_OK &&
                nDefaultButton <= SALSYSTEM_SHOWNATIVEMSGBOX_BTN_NO, "Invalid arguments!" );

    int nFlags = MB_TASKMODAL | MB_SETFOREGROUND | MB_ICONWARNING | nButtonCombination;

    if (nButtonCombination >= SALSYSTEM_SHOWNATIVEMSGBOX_BTNCOMBI_OK &&
        nButtonCombination <= SALSYSTEM_SHOWNATIVEMSGBOX_BTNCOMBI_RETRY_CANCEL &&
        nDefaultButton >= SALSYSTEM_SHOWNATIVEMSGBOX_BTN_OK &&
        nDefaultButton <= SALSYSTEM_SHOWNATIVEMSGBOX_BTN_NO)
        nFlags |= DEFAULT_BTN_MAPPING_TABLE[nButtonCombination][nDefaultButton];

    ImplHideSplash();
    return MessageBoxW(
        0,
        reinterpret_cast<LPCWSTR>(rMessage.getStr()),
        reinterpret_cast<LPCWSTR>(rTitle.getStr()),
        nFlags);
}

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