/*

Miranda NG: the free IM client for Microsoft* Windows*

Copyright (c) 2012-18 Miranda NG team (https://miranda-ng.org),
Copyright (c) 2000-03 Miranda ICQ/IM project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include "stdafx.h"

TCluiData cfg::dat = { 0 };
ClcData* cfg::clcdat = nullptr;

static mir_cs cachecs;
LIST<TExtraCache> cfg::arCache(100, NumericKeySortT);

bool cfg::shutDown = false;

TSysConfig API::sysConfig = { 0 };
TSysState  API::sysState = { 0 };

pfnDwmExtendFrameIntoClientArea_t API::pfnDwmExtendFrameIntoClientArea = nullptr;
pfnDwmIsCompositionEnabled_t API::pfnDwmIsCompositionEnabled = nullptr;

EXCEPTION_RECORD API::exRecord = { 0 };
CONTEXT API::exCtx = { 0 };
LRESULT API::exLastResult = 0;
char    API::exSzFile[MAX_PATH] = "";
wchar_t   API::exReason[256] = L"";
int     API::exLine = 0;
bool    API::exAllowContinue = false;
HMODULE API::hDwm = nullptr;

TExtraCache* cfg::getCache(const MCONTACT hContact, const char *szProto)
{
	int idx = cfg::arCache.getIndex((TExtraCache*)&hContact);
	if (idx != -1)
		return cfg::arCache[idx];

	mir_cslock lck(cachecs);
	TExtraCache *p = (TExtraCache*)calloc(sizeof(TExtraCache), 1);
	p->hContact = hContact;
	LoadSkinItemToCache(p);
	p->dwDFlags = db_get_dw(hContact, "CList", "CLN_Flags", 0);
	GetCachedStatusMsg(p, const_cast<char *>(szProto));
	p->dwLastMsgTime = INTSORT_GetLastMsgTime(hContact);
	cfg::arCache.insert(p);
	return p;
}

void ReloadSkinItemsToCache()
{
	for (int i = 0; i < cfg::arCache.getCount(); i++) {
		TExtraCache *p = cfg::arCache[i];
		LoadSkinItemToCache(p);
	}
}

void CSH_Destroy()
{
	for (int i = 0; i < cfg::arCache.getCount(); i++) {
		TExtraCache *p = cfg::arCache[i];
		if (p->statusMsg)
			free(p->statusMsg);
		if (p->status_item) {
			StatusItems_t *item = p->status_item;

			free(p->status_item);
			p->status_item = nullptr;
			for (int j = i; j < cfg::arCache.getCount(); j++) // avoid duplicate free()'ing status item pointers (there are references from sub to master contacts, so compare the pointers...
				if (cfg::arCache[j]->status_item == item)
					cfg::arCache[j]->status_item = nullptr;
		}
		free(p);
	}

	cfg::arCache.destroy();
}

void API::onInit()
{
	sysConfig.isVistaPlus = (IsWinVerVistaPlus() ? true : false);
	sysConfig.isSevenPlus = (IsWinVer7Plus() ? true : false);

	if (sysConfig.isVistaPlus) {
		if ((hDwm = Utils::loadSystemLibrary(L"\\dwmapi.dll"), true) != 0) {
			pfnDwmIsCompositionEnabled = (pfnDwmIsCompositionEnabled_t)GetProcAddress(hDwm, "DwmIsCompositionEnabled");
			pfnDwmExtendFrameIntoClientArea = (pfnDwmExtendFrameIntoClientArea_t)GetProcAddress(hDwm, "DwmExtendFrameIntoClientArea");
		}
	}

	updateState();
}

/**
 * update system's state (theme status, aero status, DWM check...
 *
 * called when windows broadcasts things like WM_THEMECHANGED or
 * WM_DWMCOMPOSITIONCHANGED
 */
void API::updateState()
{
	BOOL result = FALSE;

	memset(&sysState, 0, sizeof(TSysState));

	sysState.isThemed = IsThemeActive() ? true : false;

	if (sysConfig.isVistaPlus) {
		sysState.isDwmActive = (pfnDwmIsCompositionEnabled && (pfnDwmIsCompositionEnabled(&result) == S_OK) && result) ? true : false;
		sysState.isAero = /* (CSkin::m_skinEnabled == false) && */ db_get_b(NULL, "CLUI", "useAero", 1) /* && CSkin::m_fAeroSkinsValid */ && sysState.isDwmActive;
	}
}

/**
 * exception handling for SEH exceptions
 */

/**
 * exception handling - copy error message to clip board
 * @param hWnd: 	window handle of the edit control containing the error message
 */
void API::Ex_CopyEditToClipboard(HWND hWnd)
{
	SendMessage(hWnd, EM_SETSEL, 0, 65535L);
	SendMessage(hWnd, WM_COPY, 0, 0);
	SendMessage(hWnd, EM_SETSEL, 0, 0);
}

INT_PTR CALLBACK API::Ex_DlgProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM)
{
	WORD wNotifyCode, wID;

	switch (uMsg) {
	case WM_INITDIALOG: {
			char szBuffer[2048];
#ifdef _WIN64
			mir_snprintf(szBuffer,
				"Exception %16.16X at address %16.16X occured in %s at line %d.\r\n\r\nEAX=%16.16X EBX=%16.16X ECX=%16.16X\r\nEDX=%16.16X ESI=%16.16X EDI=%16.16X\r\nEBP=%16.16X ESP=%16.16X EIP=%16.16X",
				exRecord.ExceptionCode, exRecord.ExceptionAddress, exSzFile, exLine,
				exCtx.Rax, exCtx.Rbx, exCtx.Rcx, exCtx.Rdx,
				exCtx.Rsi, exCtx.Rdi, exCtx.Rbp, exCtx.Rsp, exCtx.Rip);
#else
			mir_snprintf(szBuffer,
				"Exception %8.8X at address %8.8X occured in %s at line %d.\r\n\r\nEAX=%8.8X EBX=%8.8X ECX=%8.8X\r\nEDX=%8.8X ESI=%8.8X EDI=%8.8X\r\nEBP=%8.8X ESP=%8.8X EIP=%8.8X",
				exRecord.ExceptionCode, exRecord.ExceptionAddress, exSzFile, exLine,
				exCtx.Eax,exCtx.Ebx, exCtx.Ecx, exCtx.Edx,
				exCtx.Esi, exCtx.Edi, exCtx.Ebp, exCtx.Esp, exCtx.Eip);
#endif
			SetDlgItemTextA(hwndDlg, IDC_EXCEPTION_DETAILS, szBuffer);
			SetFocus(GetDlgItem(hwndDlg, IDC_EXCEPTION_DETAILS));
			SendDlgItemMessage(hwndDlg, IDC_EXCEPTION_DETAILS, WM_SETFONT, (WPARAM)GetStockObject(OEM_FIXED_FONT), 0);
			SetDlgItemText(hwndDlg, IDC_EX_REASON, exReason);
			Utils::enableDlgControl(hwndDlg, IDOK, exAllowContinue ? TRUE : FALSE);
		}
							  break;

	case WM_COMMAND:
		wNotifyCode = HIWORD(wParam);
		wID = LOWORD(wParam);
		if (wNotifyCode == BN_CLICKED) {
			if (wID == IDOK || wID == IDCANCEL)
				EndDialog(hwndDlg, wID);

			if (wID == IDC_COPY_EXCEPTION)
				Ex_CopyEditToClipboard(GetDlgItem(hwndDlg, IDC_EXCEPTION_DETAILS));
		}

		break;
	}
	return FALSE;
}

void API::Ex_Handler()
{
	if (exLastResult == IDCANCEL)
		ExitProcess(1);
}

int API::Ex_ShowDialog(EXCEPTION_POINTERS *ep, const char *szFile, int line, wchar_t* szReason, bool fAllowContinue)
{
	char szDrive[MAX_PATH], szDir[MAX_PATH], szName[MAX_PATH], szExt[MAX_PATH];

	_splitpath(szFile, szDrive, szDir, szName, szExt);
	memcpy(&exRecord, ep->ExceptionRecord, sizeof(EXCEPTION_RECORD));
	memcpy(&exCtx, ep->ContextRecord, sizeof(CONTEXT));

	mir_snprintf(exSzFile, "%s%s", szName, szExt);
	mir_snwprintf(exReason, L"An application error has occured: %s", szReason);
	exLine = line;
	exLastResult = DialogBoxParam(g_hInst, MAKEINTRESOURCE(IDD_EXCEPTION), nullptr, Ex_DlgProc, 0);
	exAllowContinue = fAllowContinue;
	if (IDCANCEL == exLastResult)
		ExitProcess(1);
	return 1;
}


// enable or disable a dialog control
void TSAPI Utils::enableDlgControl(const HWND hwnd, UINT id, BOOL fEnable)
{
	::EnableWindow(::GetDlgItem(hwnd, id), fEnable);
}

// show or hide a dialog control
void TSAPI Utils::showDlgControl(const HWND hwnd, UINT id, int showCmd)
{
	::ShowWindow(::GetDlgItem(hwnd, id), showCmd);
}

/**
 * load a system library from the Windows system path and return its module
 * handle.
 *
 * return 0 and throw an exception if something goes wrong.
 */
HMODULE Utils::loadSystemLibrary(const wchar_t* szFilename, bool useGetHandle)
{
	wchar_t sysPathName[MAX_PATH + 2];
	HMODULE _h = nullptr;

	try {
		if (0 == ::GetSystemDirectory(sysPathName, MAX_PATH))
			throw(CRTException("Error while loading system library", szFilename));

		sysPathName[MAX_PATH - 1] = 0;
		if (mir_wstrlen(sysPathName) + mir_wstrlen(szFilename) >= MAX_PATH)
			throw(CRTException("Error while loading system library", szFilename));

		mir_wstrcat(sysPathName, szFilename);
		if (useGetHandle)
			_h = ::GetModuleHandle(sysPathName);
		else
			_h = LoadLibrary(sysPathName);
		if (nullptr == _h)
			throw(CRTException("Error while loading system library", szFilename));
	}
	catch (CRTException& ex) {
		ex.display();
		return nullptr;
	}
	return (_h);
}

CRTException::CRTException(const char *szMsg, const wchar_t *szParam) : std::runtime_error(std::string(szMsg))
{
	mir_snwprintf(m_szParam, MAX_PATH, szParam);
}

void CRTException::display() const
{
	wchar_t *tszMsg = mir_a2u(what());

	wchar_t tszBoxMsg[500];
	mir_snwprintf(tszBoxMsg, L"%s\n\n(%s)", tszMsg, m_szParam);
	::MessageBox(nullptr, tszBoxMsg, L"Clist_nicer runtime error", MB_OK | MB_ICONERROR);
	mir_free(tszMsg);
}