#include "PlatformUtils.h"
#include "printutils.h"
#ifndef _WIN32_WINNT
#define _WIN32_WINNT 0x0501
#endif
#undef NOGDI
#include <windows.h>
#ifndef _WIN32_IE
#define _WIN32_IE 0x0501 // SHGFP_TYPE_CURRENT
#endif
#include <shlobj.h>

std::string PlatformUtils::pathSeparatorChar()
{
	return ";";
}

// convert from windows api w_char strings (usually utf16) to utf8 std::string
std::string winapi_wstr_to_utf8( std::wstring wstr )
{
	UINT CodePage = CP_UTF8;
	DWORD dwFlags = 0;
	LPCWSTR lpWideCharStr = &wstr[0];
	int cchWideChar = (int)wstr.size();
	LPSTR lpMultiByteStr = NULL;
	int cbMultiByte = 0;
	LPCSTR lpDefaultChar = NULL;
	LPBOOL lpUsedDefaultChar = NULL;

	int numbytes = WideCharToMultiByte( CodePage, dwFlags, lpWideCharStr,
	  cchWideChar, lpMultiByteStr, cbMultiByte, lpDefaultChar, lpUsedDefaultChar );

	//PRINTB("utf16 to utf8 conversion: numbytes %i",numbytes);

	std::string utf8_str(numbytes,0);
	lpMultiByteStr = &utf8_str[0];
	cbMultiByte = numbytes;

	int result = WideCharToMultiByte( CodePage, dwFlags, lpWideCharStr,
	  cchWideChar, lpMultiByteStr, cbMultiByte, lpDefaultChar, lpUsedDefaultChar );

	if (result != numbytes) {
		DWORD errcode = GetLastError();
		PRINT("ERROR: error converting w_char str to utf8 string");
		PRINTB("ERROR: error code %i",errcode);
	}

	return utf8_str;
}

// see http://msdn.microsoft.com/en-us/library/windows/desktop/bb762494%28v=vs.85%29.aspx
static const std::string getFolderPath(int nFolder)
{
	std::wstring path(MAX_PATH,0);

	HWND hwndOwner = 0;
	HANDLE hToken = NULL;
	DWORD dwFlags = SHGFP_TYPE_CURRENT;
	LPTSTR pszPath = &path[0];

	int result = SHGetFolderPathW( hwndOwner, nFolder, hToken, dwFlags, pszPath );

	if (result == S_OK) {
        path = std::wstring( path.c_str() ); // strip extra NULLs
        // Use boost::filesystem to decide how to convert from wstring
        // to string. Normally the path encoding is system local and
        // we don't want to force conversion to UTF-8.
        fs::path p(path);
        return p.string();
	}
	return "";
}

// retrieve the path to 'My Documents' for the current user under windows
// In XP this is 'c:\documents and settings\username\my documents'
// In Vista, 7, 8+ this is 'c:\users\username\documents'
// This code may have problems with unusual dir types in Vista because
// Mingw does not provide access to the updated SHGetKnownFolderPath
std::string PlatformUtils::documentsPath()
{
	const std::string retval = getFolderPath(CSIDL_PERSONAL);
	if (retval.empty()) {
	    PRINT("ERROR: Could not find My Documents location");
	}
	return retval;
}

std::string PlatformUtils::userConfigPath()
{
	const std::string retval = getFolderPath(CSIDL_LOCAL_APPDATA);
	if (retval.empty()) {
	    PRINT("ERROR: Could not find Local AppData location");
	}
	return retval + std::string("/") + PlatformUtils::OPENSCAD_FOLDER_NAME;
}

unsigned long PlatformUtils::stackLimit()
{
    return STACK_LIMIT_DEFAULT;
}

typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);

// see http://msdn.microsoft.com/en-us/library/windows/desktop/ms684139%28v=vs.85%29.aspx
static BOOL IsWow64()
{
    BOOL bIsWow64 = FALSE;

    //IsWow64Process is not available on all supported versions of Windows.
    //Use GetModuleHandle to get a handle to the DLL that contains the function
    //and GetProcAddress to get a pointer to the function if available.
    LPFN_ISWOW64PROCESS fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process");

    if (NULL != fnIsWow64Process) {
        if (!fnIsWow64Process(GetCurrentProcess(), &bIsWow64))
        {
	    return false;
        }
    }
    return bIsWow64;
}

std::string PlatformUtils::sysinfo()
{
    std::string result;
    
    OSVERSIONINFOEX osinfo;
    osinfo.dwOSVersionInfoSize = sizeof(osinfo);
    if (GetVersionEx((OSVERSIONINFO*)&osinfo) == 0) {
	result += "Unknown Windows";
    } else {
	unsigned int version = osinfo.dwMajorVersion * 1000 + osinfo.dwMinorVersion;
	if (osinfo.dwPlatformId == VER_PLATFORM_WIN32_NT) {
	    switch (version) {
	    case 5000:
		    result += "Windows 2000";
		    break;
	    case 5001:
		    result += "Windows XP";
		    break;
	    case 5002:
		    result += "Windows Server 2003";
		    break;
	    case 6000:
		    result += (osinfo.wProductType == VER_NT_WORKSTATION ? "Windows Vista" : "Windows Server 2008");
		    break;
	    case 6001:
		    result += (osinfo.wProductType == VER_NT_WORKSTATION ? "Windows 7" : "Windows Server 2008 R2");
		    break;
	    case 6002:
		    result += (osinfo.wProductType == VER_NT_WORKSTATION ? "Windows 8" : "Windows Server 2012");
		    break;
	    case 6003:
		    // For applications that have been manifested for Windows 8.1.
		    result += (osinfo.wProductType == VER_NT_WORKSTATION ? "Windows 8.1" : "Windows Server 2012 R2");
		    break;
	    }
	    boost::format fmt(" (v%d.%d)");
	    fmt % osinfo.dwMajorVersion % osinfo.dwMinorVersion;
	    result += fmt.str();
	} else {
	    boost::format fmt("Unknown Windows (dwPlatformId = %d, dwMajorVersion = %d, dwMinorVersion = %d");
	    fmt % osinfo.dwPlatformId % osinfo.dwMajorVersion % osinfo.dwMinorVersion;
	    result += fmt.str();
	}    
    }

    SYSTEM_INFO systeminfo;
    bool isWow64 = IsWow64();
    if (isWow64) {
	GetNativeSystemInfo(&systeminfo);
    } else {
	GetSystemInfo(&systeminfo);   
    }

    int numcpu = systeminfo.dwNumberOfProcessors;
    boost::format fmt(" %d CPU%s%s");
    fmt % numcpu % (numcpu > 1 ? "s" : "") % (isWow64 ? " WOW64" : "");
    result += fmt.str();

    MEMORYSTATUSEX memoryinfo;
    memoryinfo.dwLength = sizeof(memoryinfo);
    if (GlobalMemoryStatusEx(&memoryinfo) != 0) {
	    result += " ";
	    result += PlatformUtils::toMemorySizeString(memoryinfo.ullTotalPhys, 2);
	    result += " RAM";
    }
    
    return result;
}

#include <io.h>
#include <stdio.h>
#include <fstream>

// attach to parent console if standard IO handles not available
// It may be good idea to redirect the output to file(s) here in some future.
void PlatformUtils::ensureStdIO(void)
{
	// Preserve existing handles whenever available.
	// HANDLE hRead = (HANDLE)_get_osfhandle(_fileno(stdin));
	HANDLE hWrite = (HANDLE)_get_osfhandle(_fileno(stdout));
	HANDLE hError = (HANDLE)_get_osfhandle(_fileno(stderr));

	if (/* INVALID_HANDLE_VALUE != hRead && */ INVALID_HANDLE_VALUE != hWrite && INVALID_HANDLE_VALUE != hError)
		return;

	// I see nothing to do about error(s) here.
	if (!AttachConsole(ATTACH_PARENT_PROCESS)) return;

	// Let CRT machinery performs proper setup.
	// if (INVALID_HANDLE_VALUE == hRead) (void)_wfreopen(L"CONIN$",  L"rt", stdin);
	if (INVALID_HANDLE_VALUE == hWrite) (void)_wfreopen(L"CONOUT$",  L"wt", stdout);
	if (INVALID_HANDLE_VALUE == hError) (void)_wfreopen(L"CONOUT$",  L"wt", stderr);

	std::ios_base::sync_with_stdio();
}