#include "animia/util/win32.h"

#include <shlobj.h>  /* SHGetKnownFolderPath */
#include <subauth.h> /* UNICODE_STRING */
#include <windows.h>

namespace animia::internal::win32 {

std::string ToUtf8String(const std::wstring& string) {
	const auto wctomb = [&string](LPSTR out, int size) -> int {
		return ::WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.length(), out, size, nullptr, nullptr);
	};

	if (string.empty())
		return std::string();

	long size = ::WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.length(), nullptr, 0, nullptr, nullptr);
	std::string ret = std::string(size, '\0');
	::WideCharToMultiByte(CP_UTF8, 0, string.c_str(), string.length(), &ret.front(), ret.length(), nullptr, nullptr);
	return ret;
}

std::string ToUtf8String(const UNICODE_STRING& string) {
	const auto wctomb = [&string](LPSTR out, int size) -> int {
		return ::WideCharToMultiByte(CP_UTF8, 0, string.Buffer, string.Length, out, size, nullptr, nullptr);
	};

	if (string.Length <= 0)
		return std::string();

	long size = wctomb(nullptr, 0);
	std::string ret = std::string(size, '\0');
	wctomb(&ret.front(), ret.length());
	return ret;
}

std::wstring ToWstring(const std::string& string) {
	const auto mbtowc = [&string](LPWSTR out, int size) -> int {
		return ::MultiByteToWideChar(CP_UTF8, 0, string.c_str(), string.length(), out, size);
	};

	if (string.empty())
		return std::wstring();

	long size = mbtowc(nullptr, 0);
	std::wstring ret = std::wstring(size, L'\0');
	mbtowc(&ret.front(), ret.length());
	return ret;
}

std::wstring GetFileNameFromPath(const std::wstring& path) {
	const auto pos = path.find_last_of(L"/\\");
	return pos != std::wstring::npos ? path.substr(pos + 1) : path;
}

std::wstring GetFileNameWithoutExtension(const std::wstring& filename) {
	const auto pos = filename.find_last_of(L".");
	return pos != std::wstring::npos ? filename.substr(0, pos) : filename;
}

static std::wstring GetSystemDirectory() {
	PWSTR path_wch;
	SHGetKnownFolderPath(FOLDERID_Windows, 0, NULL, &path_wch);
	std::wstring path_wstr(path_wch);
	CoTaskMemFree(path_wch);
	return path_wstr;
}

bool IsSystemDirectory(const std::string& path) {
	std::wstring path_w = ToWstring(path);
	::CharUpperBuffW(&path_w.front(), path_w.length());

	std::wstring windir = GetSystemDirectory();
	::CharUpperBuffW(&windir.front(), windir.length());

	/* wtf is 4? */
	return path_w.find(windir) == 4;
}

bool IsSystemDirectory(std::wstring path) {
	::CharUpperBuffW(&path.front(), path.length());

	std::wstring windir = GetSystemDirectory();
	::CharUpperBuffW(&windir.front(), windir.length());

	return path.find(windir) == 4;
}

} // namespace animia::internal::win32