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#include <windows.h>

#include "common.h"

Win32Error::Win32Error(const DWORD dwErr) : m_dwErr(dwErr) {}

Win32Error::~Win32Error()
{
	if (m_szMsg)
		HeapFree(GetProcessHeap(), 0, m_szMsg);
	if (m_wszMsg)
		HeapFree(GetProcessHeap(), 0, m_wszMsg);
}

const char* Win32Error::what() const noexcept 
{
	if (!m_szMsg)
		FormatMessageA(
		    FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
		    NULL,
		    m_dwErr,
		    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
		    (char*)&m_szMsg,
		    0, NULL
		);
	return m_szMsg;
}

const TCHAR* Win32Error::twhat() const noexcept 
{
#ifdef UNICODE
#define M m_wszMsg
#else
#define M m_szMsg
#endif
	if (!M)
		FormatMessage(
		    FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
		    NULL,
		    m_dwErr,
		    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
		    (TCHAR*)&M,
		    0, NULL
		);
	return M;
#undef M
}

Library::Library(const TCHAR* const tszLibrary)
{
	m_hModule = LoadLibrary(tszLibrary);
	if (!m_hModule)
		throw Win32Error(GetLastError());
}

Library::~Library()
{
	FreeLibrary(m_hModule);
}

/* Move message box to center of main window. */
static LRESULT CALLBACK CBTProc(const int nCode, const WPARAM wParam, const LPARAM lParam)
{
	extern HWND g_hWnd;
	if (!g_hWnd || nCode < 0 || nCode != HCBT_ACTIVATE)
		return CallNextHookEx(0, nCode, wParam, lParam);

	HWND hWnd = (HWND)wParam;
	if (long lStyle = GetWindowLong(hWnd, GWL_STYLE))
		if (lStyle & WS_POPUP) {
			RECT rcMain, rcMsg;
			GetWindowRect(g_hWnd, &rcMain);
			GetWindowRect(hWnd, &rcMsg);
			SetWindowPos(hWnd, NULL,
			    rcMain.left+(rcMain.right-rcMain.left)/2-(rcMsg.right-rcMsg.left)/2,
			    rcMain.top+(rcMain.bottom-rcMain.top)/2-(rcMsg.bottom-rcMsg.top)/2,
			    -1, -1,
			    SWP_NOZORDER|SWP_NOSIZE|SWP_NOACTIVATE);
		}

	return 0;
}

int EBMessageBox(const TCHAR* const tszText, const TCHAR* const tszCaption, const unsigned uType)
{
	extern HWND g_hWnd;
	HHOOK hHook = SetWindowsHookEx(WH_CBT, CBTProc, 0, GetCurrentThreadId());
	if (!hHook) return 0;
	MessageBox(g_hWnd, tszText, tszCaption, uType);
	UnhookWindowsHookEx(hHook);
	if (!hHook) throw Win32Error(GetLastError());
	return 0;
}

int EBMessageBoxA(const char* const szText, const char* const szCaption, const unsigned uType)
{
	extern HWND g_hWnd;
	HHOOK hHook = SetWindowsHookEx(WH_CBT, CBTProc, 0, GetCurrentThreadId());
	if (!hHook) return 0;
	MessageBoxA(g_hWnd, szText, szCaption, uType);
	UnhookWindowsHookEx(hHook);
	if (!hHook) throw Win32Error(GetLastError());
	return 0;
}