/*
 *  Notepad (settings.c)
 *
 *  Copyright 1998,99 Marcel Baur <mbaur@g26.ethz.ch>
 *  Copyright 2002 Sylvain Petreolle <spetreolle@yahoo.fr>
 *  Copyright 2002 Andriy Palamarchuk
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "notepad.h"

#include <winreg.h>

static LPCTSTR s_szRegistryKey = _T("Software\\Microsoft\\Notepad");


static LONG HeightFromPointSize(DWORD dwPointSize)
{
	LONG lHeight;
	HDC hDC;

	hDC = GetDC(NULL);
	lHeight = -MulDiv(dwPointSize, GetDeviceCaps(hDC, LOGPIXELSY), 720);
	ReleaseDC(NULL, hDC);

	return lHeight;
}

static DWORD PointSizeFromHeight(LONG lHeight)
{
	DWORD dwPointSize;
	HDC hDC;

	hDC = GetDC(NULL);
	dwPointSize = -MulDiv(lHeight, 720, GetDeviceCaps(hDC, LOGPIXELSY));
	ReleaseDC(NULL, hDC);

	/* round to nearest multiple of 10 */
	dwPointSize += 5;
	dwPointSize -= dwPointSize % 10;

	return dwPointSize;
}

static BOOL QueryGeneric(HKEY hKey, LPCTSTR pszValueNameT, DWORD dwExpectedType,
	LPVOID pvResult, DWORD dwResultSize)
{
	DWORD dwType, cbData;
	LPVOID *pTemp = _alloca(dwResultSize);

	ZeroMemory(pTemp, dwResultSize);

	cbData = dwResultSize;
	if (RegQueryValueEx(hKey, pszValueNameT, NULL, &dwType, (LPBYTE) pTemp, &cbData) != ERROR_SUCCESS)
		return FALSE;

	if (dwType != dwExpectedType)
		return FALSE;

	memcpy(pvResult, pTemp, cbData);
	return TRUE;
}

static BOOL QueryDword(HKEY hKey, LPCTSTR pszValueName, DWORD *pdwResult)
{
	return QueryGeneric(hKey, pszValueName, REG_DWORD, pdwResult, sizeof(*pdwResult));
}

static BOOL QueryByte(HKEY hKey, LPCTSTR pszValueName, BYTE *pbResult)
{
	DWORD dwResult;
	if (!QueryGeneric(hKey, pszValueName, REG_DWORD, &dwResult, sizeof(dwResult)))
		return FALSE;
	if (dwResult >= 0x100)
		return FALSE;
	*pbResult = (BYTE) dwResult;
	return TRUE;
}

static BOOL QueryBool(HKEY hKey, LPCTSTR pszValueName, BOOL *pbResult)
{
	DWORD dwResult;
	if (!QueryDword(hKey, pszValueName, &dwResult))
		return FALSE;
	*pbResult = dwResult ? TRUE : FALSE;
	return TRUE;
}

static BOOL QueryString(HKEY hKey, LPCTSTR pszValueName, LPTSTR pszResult, DWORD dwResultSize)
{
	return QueryGeneric(hKey, pszValueName, REG_SZ, pszResult, dwResultSize * sizeof(TCHAR));
}

void LoadSettings(void)
{
	HKEY hKey = NULL;
	HFONT hFont;
	DWORD dwPointSize = 0;
	INT base_length, dx, dy;

	base_length = (GetSystemMetrics(SM_CXSCREEN) > GetSystemMetrics(SM_CYSCREEN))?
		GetSystemMetrics(SM_CYSCREEN) : GetSystemMetrics(SM_CXSCREEN);

	dx = (INT)(base_length * .95);
	dy = dx * 3 / 4;
	SetRect( &Globals.main_rect, 0, 0, dx, dy );

	if (RegOpenKey(HKEY_CURRENT_USER, s_szRegistryKey, &hKey) == ERROR_SUCCESS)
	{
		QueryByte(hKey,     _T("lfCharSet"),        &Globals.lfFont.lfCharSet);
		QueryByte(hKey,     _T("lfClipPrecision"),  &Globals.lfFont.lfClipPrecision);
		QueryDword(hKey,    _T("lfEscapement"),     (DWORD*)&Globals.lfFont.lfEscapement);
		QueryString(hKey,   _T("lfFaceName"),       Globals.lfFont.lfFaceName, sizeof(Globals.lfFont.lfFaceName) / sizeof(Globals.lfFont.lfFaceName[0]));
		QueryByte(hKey,     _T("lfItalic"),         &Globals.lfFont.lfItalic);
		QueryDword(hKey,    _T("lfOrientation"),    (DWORD*)&Globals.lfFont.lfOrientation);
		QueryByte(hKey,     _T("lfOutPrecision"),   &Globals.lfFont.lfOutPrecision);
		QueryByte(hKey,     _T("lfPitchAndFamily"), &Globals.lfFont.lfPitchAndFamily);
		QueryByte(hKey,     _T("lfQuality"),        &Globals.lfFont.lfQuality);
		QueryByte(hKey,     _T("lfStrikeOut"),      &Globals.lfFont.lfStrikeOut);
		QueryByte(hKey,     _T("lfUnderline"),      &Globals.lfFont.lfUnderline);
		QueryDword(hKey,    _T("lfWeight"),         (DWORD*)&Globals.lfFont.lfWeight);
		QueryDword(hKey,    _T("iPointSize"),       &dwPointSize);
		QueryBool(hKey,     _T("fWrap"),            &Globals.bWrapLongLines);
		QueryBool(hKey,     _T("fStatusBar"),       &Globals.bShowStatusBar);

		QueryDword(hKey,    _T("iWindowPosX"),      (DWORD*)&Globals.main_rect.left);
		QueryDword(hKey,    _T("iWindowPosY"),      (DWORD*)&Globals.main_rect.top);
		QueryDword(hKey,    _T("iWindowPosDX"),     (DWORD*)&dx);
		QueryDword(hKey,    _T("iWindowPosDY"),     (DWORD*)&dy);

        Globals.main_rect.right = Globals.main_rect.left + dx;
        Globals.main_rect.bottom = Globals.main_rect.top + dy;

		Globals.bShowStatusBar = !Globals.bShowStatusBar; /* invert value becuase DIALOG_ViewStatusBar will be called to show it*/

		if (dwPointSize != 0)
			Globals.lfFont.lfHeight = HeightFromPointSize(dwPointSize);

		RegCloseKey(hKey);
	}

	hFont = CreateFontIndirect(&Globals.lfFont);
	if (hFont)
	{
		if (Globals.hFont)
			DeleteObject(Globals.hFont);
		Globals.hFont = hFont;
	}
}

static BOOL SaveDword(HKEY hKey, LPCTSTR pszValueNameT, DWORD dwValue)
{
	return RegSetValueEx(hKey, pszValueNameT, 0, REG_DWORD, (LPBYTE) &dwValue, sizeof(dwValue)) == ERROR_SUCCESS;
}

static BOOL SaveString(HKEY hKey, LPCTSTR pszValueNameT, LPCTSTR pszValue)
{
	return RegSetValueEx(hKey, pszValueNameT, 0, REG_SZ, (LPBYTE) pszValue, (DWORD) _tcslen(pszValue) * sizeof(*pszValue)) == ERROR_SUCCESS;
}

void SaveSettings(void)
{
	HKEY hKey;
	DWORD dwDisposition;

    GetWindowRect(Globals.hMainWnd, &Globals.main_rect);

	if (RegCreateKeyEx(HKEY_CURRENT_USER, s_szRegistryKey, 0, NULL, 0, KEY_ALL_ACCESS, NULL, &hKey, &dwDisposition)
		== ERROR_SUCCESS)
	{
		SaveDword(hKey,     _T("lfCharSet"),        Globals.lfFont.lfCharSet);
		SaveDword(hKey,     _T("lfClipPrecision"),  Globals.lfFont.lfClipPrecision);
		SaveDword(hKey,     _T("lfEscapement"),     Globals.lfFont.lfEscapement);
		SaveString(hKey,    _T("lfFaceName"),       Globals.lfFont.lfFaceName);
		SaveDword(hKey,     _T("lfItalic"),         Globals.lfFont.lfItalic);
		SaveDword(hKey,     _T("lfOrientation"),    Globals.lfFont.lfOrientation);
		SaveDword(hKey,     _T("lfOutPrecision"),   Globals.lfFont.lfOutPrecision);
		SaveDword(hKey,     _T("lfPitchAndFamily"), Globals.lfFont.lfPitchAndFamily);
		SaveDword(hKey,     _T("lfQuality"),        Globals.lfFont.lfQuality);
		SaveDword(hKey,     _T("lfStrikeOut"),      Globals.lfFont.lfStrikeOut);
		SaveDword(hKey,     _T("lfUnderline"),      Globals.lfFont.lfUnderline);
		SaveDword(hKey,     _T("lfWeight"),         Globals.lfFont.lfWeight);
		SaveDword(hKey,     _T("iPointSize"),       PointSizeFromHeight(Globals.lfFont.lfHeight));
		SaveDword(hKey,     _T("fWrap"),            Globals.bWrapLongLines ? 1 : 0);
		SaveDword(hKey,     _T("fStatusBar"),       Globals.bShowStatusBar ? 1 : 0);
		SaveDword(hKey,     _T("iWindowPosX"),      Globals.main_rect.left);
		SaveDword(hKey,     _T("iWindowPosY"),      Globals.main_rect.top);
		SaveDword(hKey,     _T("iWindowPosDX"),     Globals.main_rect.right - Globals.main_rect.left);
		SaveDword(hKey,     _T("iWindowPosDY"),     Globals.main_rect.bottom - Globals.main_rect.top);
		RegCloseKey(hKey);
	}

}