/*
  Windows Clipboard routines -- adapted from SDL 2 for the OHRRPGCE.
  Copyright 2017. This file is distributed under the original license, as
  follows, rather than the OHRRPGCE's license.
  Simple DirectMedia Layer
  Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/

#define WIN32_LEAN_AND_MEAN
#define STRICT
#define UNICODE 1
#define _WIN32_WINNT 0x0500  // For GetClipboardSequenceNumber

#include "SDL_windowsclipboard.h"
#include "internal.h"
#include "../../errorlog.h"
#include "../../os.h"
#include "../../gfx_common/ohrstring.hpp"

int clipboard_count = 0;

// The following function originally in SDL_windows.c

/* Logs an error message based on GetLastError() */
int
WIN_SetError(const char *prefix)
{
    debug(errInfo, "%s: %s", prefix, win_error_str(GetLastError()));
    return -1;
}

int
WIN_SetClipboardText(HWND hWindow, const char *text)
{
    int result = 0;

    if (OpenClipboard(hWindow)) {
        HANDLE hMem;
        LPTSTR tstr;
        SIZE_T i, size;

        /* Convert the text from UTF-8 to Windows Unicode */
        tstr = MBstringToWstring(text, CP_UTF8);
        if (!tstr) {
            return -1;
        }

        /* Find out the size of the data */
        for (size = 0, i = 0; tstr[i]; ++i, ++size) {
            if (tstr[i] == '\n' && (i == 0 || tstr[i-1] != '\r')) {
                /* We're going to insert a carriage return */
                ++size;
            }
        }

        /* Save the data to the clipboard */
        hMem = GlobalAlloc(GMEM_MOVEABLE, (size+1)*sizeof(*tstr));
        if (hMem) {
            LPTSTR dst = (LPTSTR)GlobalLock(hMem);
            if (dst) {
                /* Copy the text over, adding carriage returns as necessary */
                for (i = 0; tstr[i]; ++i) {
                    if (tstr[i] == '\n' && (i == 0 || tstr[i-1] != '\r')) {
                        *dst++ = '\r';
                    }
                    *dst++ = tstr[i];
                }
                *dst = 0;
                GlobalUnlock(hMem);
            }

            EmptyClipboard();
            if (!SetClipboardData(CF_UNICODETEXT, hMem)) {
                result = WIN_SetError("Couldn't set clipboard data");
            }

            // Normally, saving the text in UTF16 is sufficient since Windows
            // automatically converts it to 8-bit text if requested.
            // But also save the text in ASCII, for Win 95/98 which don't know about
            // Unicode! (Win98 with Unicode layer installed doesn't work either).
            // CF_TEXT is technically system codepage, not ASCII, eh.
            // size may be larger than needed, since not adding extra \r's.
            hMem = GlobalAlloc(GMEM_MOVEABLE, size+1);
            if (hMem) {
                char *dst = (char *)GlobalLock(hMem);
                if (dst) {
                    strcpy(dst, text);
                    GlobalUnlock(hMem);
                    if (!SetClipboardData(CF_TEXT, hMem)) {
                        result = WIN_SetError("Couldn't set clipboard data");
                    }
                }
            }

            // Commented out for Win95 support
            //clipboard_count = GetClipboardSequenceNumber();
        }
        free(tstr);

        CloseClipboard();
    } else {
        // Can happen if another program is using the clipboard
        result = WIN_SetError("Couldn't open clipboard");
    }
    return result;
}

char *
WIN_GetClipboardText(HWND hWindow)
{
    char *text;

    text = NULL;
    if ((IsClipboardFormatAvailable(CF_TEXT) || IsClipboardFormatAvailable(CF_UNICODETEXT)) &&
        OpenClipboard(hWindow)) {
        HANDLE hMem;
        LPTSTR tstr;

        hMem = GetClipboardData(CF_UNICODETEXT);
        if (hMem) {
            tstr = (LPTSTR)GlobalLock(hMem);
            text = WstringToMBstring(tstr, CP_UTF8);
            GlobalUnlock(hMem);
        } else {
            // As above: also write in multibyte to support Win 95/98.
            hMem = GetClipboardData(CF_TEXT);
            if (hMem) {
                text = strdup((char*)GlobalLock(hMem));
                GlobalUnlock(hMem);
            } else {
                // Not an error; e.g. the clipboard doesn't contain text
                //WIN_SetError("Couldn't get clipboard data");
            }
        }
        CloseClipboard();

        // WIN_SetClipboardText converts to \r\n; convert back
        //if (text)
        //    strip_carriage_returns(text);
    }
    if (!text) {
        text = strdup("");
    }
    return text;
}

bool
WIN_HasClipboardText(HWND hWindow)
{
    bool result = false;
    char *text = WIN_GetClipboardText(hWindow);
    if (text) {
        result = text[0] != '\0';
        free(text);
    }
    return result;
}

/* NOTE: if you want to use this you must uncomment the other GetClipboardSequenceNumber() call too
void
WIN_CheckClipboardUpdate(struct SDL_VideoData * data)
{
    const DWORD count = GetClipboardSequenceNumber();
    if (count != clipboard_count) {
        if (clipboard_count) {
            SDL_SendClipboardUpdate();
        }
        clipboard_count = count;
    }
}
*/