#include <utility>
#include <windows.h>

#include "wcharptr.h"
#include "win.h"

WcharPtr::WcharPtr() noexcept {}

WcharPtr::WcharPtr(wchar_t* const s) noexcept : m_p(s) {}

WcharPtr& WcharPtr::operator=(wchar_t* const s) noexcept
{
	if (m_p != s) {
		delete m_p;
		m_p = s;
	}
	return *this;
}

WcharPtr::WcharPtr(WcharPtr&& other) noexcept
	: m_p(std::exchange(other.m_p, nullptr)) {}

WcharPtr& WcharPtr::operator=(WcharPtr&& other) noexcept
{
	std::swap(m_p, other.m_p);
	return *this;
}

WcharPtr::operator wchar_t*() noexcept
{
	return m_p;
}

wchar_t* WcharPtr::Release() noexcept
{
	wchar_t* p2 = m_p;
	m_p = nullptr;
	return p2;
}

WcharPtr::~WcharPtr() noexcept
{
	delete m_p;
}

WcharPtr WcharPtr::FromNarrow(const char* const src, const int cp)
{
	int cbMultiByte = strlen(src)+1;
	int cchWideChar = MultiByteToWideChar(cp, 0, src, cbMultiByte, nullptr, 0);
	wchar_t* dst = new wchar_t[cchWideChar];
	if (!MultiByteToWideChar(cp, 0, src, cbMultiByte, dst, cchWideChar)) {
		delete dst;
		throw Win32Error();
	}
	return dst;
}

WcharPtr WcharPtr::Copy(const wchar_t* const src)
{
	const int cb = wcslen(src)+1;
	wchar_t* dst = new wchar_t[cb];
	memcpy(dst, src, cb*sizeof(wchar_t));
	return dst;
}