#include <stdio.h>
#include <winpr/crt.h>
#include <winpr/error.h>
#include <winpr/windows.h>

/* Letters */

static BYTE c_cedilla_UTF8[] = "\xC3\xA7\x00";
static BYTE c_cedilla_UTF16[] = "\xE7\x00\x00\x00";
static int c_cedilla_cchWideChar = 2;
static int c_cedilla_cbMultiByte = 3;

/* English */

static BYTE en_Hello_UTF8[] = "Hello\0";
static BYTE en_Hello_UTF16[] = "\x48\x00\x65\x00\x6C\x00\x6C\x00\x6F\x00\x00\x00";
static int en_Hello_cchWideChar = 6;
static int en_Hello_cbMultiByte = 6;

static BYTE en_HowAreYou_UTF8[] = "How are you?\0";
static BYTE en_HowAreYou_UTF16[] = "\x48\x00\x6F\x00\x77\x00\x20\x00\x61\x00\x72\x00\x65\x00\x20\x00"
		"\x79\x00\x6F\x00\x75\x00\x3F\x00\x00\x00";
static int en_HowAreYou_cchWideChar = 13;
static int en_HowAreYou_cbMultiByte = 13;

/* French */

static BYTE fr_Hello_UTF8[] = "Allo\0";
static BYTE fr_Hello_UTF16[] = "\x41\x00\x6C\x00\x6C\x00\x6F\x00\x00\x00";
static int fr_Hello_cchWideChar = 5;
static int fr_Hello_cbMultiByte = 5;

static BYTE fr_HowAreYou_UTF8[] = "\x43\x6F\x6D\x6D\x65\x6E\x74\x20\xC3\xA7\x61\x20\x76\x61\x3F\x00";
static BYTE fr_HowAreYou_UTF16[] = "\x43\x00\x6F\x00\x6D\x00\x6D\x00\x65\x00\x6E\x00\x74\x00\x20\x00"
		"\xE7\x00\x61\x00\x20\x00\x76\x00\x61\x00\x3F\x00\x00\x00";
static int fr_HowAreYou_cchWideChar = 15;
static int fr_HowAreYou_cbMultiByte = 16;

/* Russian */

static BYTE ru_Hello_UTF8[] = "\xD0\x97\xD0\xB4\xD0\xBE\xD1\x80\xD0\xBE\xD0\xB2\xD0\xBE\x00";
static BYTE ru_Hello_UTF16[] = "\x17\x04\x34\x04\x3E\x04\x40\x04\x3E\x04\x32\x04\x3E\x04\x00\x00";
static int ru_Hello_cchWideChar = 8;
static int ru_Hello_cbMultiByte = 15;

static BYTE ru_HowAreYou_UTF8[] = "\xD0\x9A\xD0\xB0\xD0\xBA\x20\xD0\xB4\xD0\xB5\xD0\xBB\xD0\xB0\x3F\x00";
static BYTE ru_HowAreYou_UTF16[] = "\x1A\x04\x30\x04\x3A\x04\x20\x00\x34\x04\x35\x04\x3B\x04\x30\x04"
		"\x3F\x00\x00\x00";
static int ru_HowAreYou_cchWideChar = 10;
static int ru_HowAreYou_cbMultiByte = 17;

/* Arabic */

static BYTE ar_Hello_UTF8[] = "\xD8\xA7\xD9\x84\xD8\xB3\xD9\x84\xD8\xA7\xD9\x85\x20\xD8\xB9\xD9"
		"\x84\xD9\x8A\xD9\x83\xD9\x85\x00";
static BYTE ar_Hello_UTF16[] = "\x27\x06\x44\x06\x33\x06\x44\x06\x27\x06\x45\x06\x20\x00\x39\x06"
		"\x44\x06\x4A\x06\x43\x06\x45\x06\x00\x00";
static int ar_Hello_cchWideChar = 13;
static int ar_Hello_cbMultiByte = 24;

static BYTE ar_HowAreYou_UTF8[] = "\xD9\x83\xD9\x8A\xD9\x81\x20\xD8\xAD\xD8\xA7\xD9\x84\xD9\x83\xD8"
		"\x9F\x00";
static BYTE ar_HowAreYou_UTF16[] = "\x43\x06\x4A\x06\x41\x06\x20\x00\x2D\x06\x27\x06\x44\x06\x43\x06"
		"\x1F\x06\x00\x00";
static int ar_HowAreYou_cchWideChar = 10;
static int ar_HowAreYou_cbMultiByte = 18;

/* Chinese */

static BYTE ch_Hello_UTF8[] = "\xE4\xBD\xA0\xE5\xA5\xBD\x00";
static BYTE ch_Hello_UTF16[] = "\x60\x4F\x7D\x59\x00\x00";
static int ch_Hello_cchWideChar = 3;
static int ch_Hello_cbMultiByte = 7;

static BYTE ch_HowAreYou_UTF8[] = "\xE4\xBD\xA0\xE5\xA5\xBD\xE5\x90\x97\x00";
static BYTE ch_HowAreYou_UTF16[] = "\x60\x4F\x7D\x59\x17\x54\x00\x00";
static int ch_HowAreYou_cchWideChar = 4;
static int ch_HowAreYou_cbMultiByte = 10;

void string_hexdump(BYTE* data, int length)
{
	BYTE* p = data;
	int i, line, offset = 0;

	while (offset < length)
	{
		printf("%04x ", offset);

		line = length - offset;

		if (line > 16)
			line = 16;

		for (i = 0; i < line; i++)
			printf("%02x ", p[i]);

		for (; i < 16; i++)
			printf("   ");

		for (i = 0; i < line; i++)
			printf("%c", (p[i] >= 0x20 && p[i] < 0x7F) ? p[i] : '.');

		printf("\n");

		offset += line;
		p += line;
	}
}

int convert_utf8_to_utf16(BYTE* lpMultiByteStr, BYTE* expected_lpWideCharStr, int expected_cchWideChar)
{
	int length;
	int cbMultiByte;
	int cchWideChar;
	LPWSTR lpWideCharStr;

	cbMultiByte = strlen((char*) lpMultiByteStr);
	cchWideChar = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) lpMultiByteStr, -1, NULL, 0);

	printf("MultiByteToWideChar Input UTF8 String:\n");
	string_hexdump(lpMultiByteStr, cbMultiByte);

	printf("MultiByteToWideChar required cchWideChar: %d\n", cchWideChar);

	if (cchWideChar != expected_cchWideChar)
	{
		printf("MultiByteToWideChar unexpected cchWideChar: actual: %d expected: %d\n",
			cchWideChar, expected_cchWideChar);
		return -1;
	}

	lpWideCharStr = (LPWSTR) malloc(cchWideChar * sizeof(WCHAR));
	length = MultiByteToWideChar(CP_UTF8, 0, (LPCSTR) lpMultiByteStr, cbMultiByte + 1, lpWideCharStr, cchWideChar);

	printf("MultiByteToWideChar converted length (WCHAR): %d\n", length);

	if (!length)
	{
		DWORD error = GetLastError();
		printf("MultiByteToWideChar error: 0x%08X\n", error);
		return -1;
	}

	if (length != expected_cchWideChar)
	{
		printf("MultiByteToWideChar unexpected converted length (WCHAR): actual: %d expected: %d\n",
			length, expected_cchWideChar);
		return -1;
	}

	if (_wcscmp(lpWideCharStr, (WCHAR*) expected_lpWideCharStr) != 0)
	{
		printf("MultiByteToWideChar unexpected string:\n");

		printf("UTF8 String:\n");
		string_hexdump(lpMultiByteStr, cbMultiByte);

		printf("UTF16 String (actual):\n");
		string_hexdump((BYTE*) lpWideCharStr, length * sizeof(WCHAR));

		printf("UTF16 String (expected):\n");
		string_hexdump((BYTE*) expected_lpWideCharStr, expected_cchWideChar * sizeof(WCHAR));

		return -1;
	}

	free(lpWideCharStr);

	return length;
}

int convert_utf16_to_utf8(BYTE* lpWideCharStr, BYTE* expected_lpMultiByteStr, int expected_cbMultiByte)
{
	int length;
	int cchWideChar;
	int cbMultiByte;
	LPSTR lpMultiByteStr;

	cchWideChar = _wcslen((WCHAR*) lpWideCharStr);
	cbMultiByte = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR) lpWideCharStr, -1, NULL, 0, NULL, NULL);

	printf("WideCharToMultiByte Input UTF16 String:\n");
	string_hexdump(lpWideCharStr, cchWideChar * sizeof(WCHAR));

	printf("WideCharToMultiByte required cbMultiByte: %d\n", cbMultiByte);

	if (cbMultiByte != expected_cbMultiByte)
	{
		printf("WideCharToMultiByte unexpected cbMultiByte: actual: %d expected: %d\n",
			cbMultiByte, expected_cbMultiByte);
		return -1;
	}

	lpMultiByteStr = (LPSTR) malloc(cbMultiByte);
	length = WideCharToMultiByte(CP_UTF8, 0, (LPCWSTR) lpWideCharStr, cchWideChar + 1, lpMultiByteStr, cbMultiByte, NULL, NULL);

	printf("WideCharToMultiByte converted length (BYTE): %d\n", length);

	if (!length)
	{
		DWORD error = GetLastError();
		printf("WideCharToMultiByte error: 0x%08X\n", error);
		return -1;
	}

	if (length != expected_cbMultiByte)
	{
		printf("WideCharToMultiByte unexpected converted length (BYTE): actual: %d expected: %d\n",
			length, expected_cbMultiByte);
		return -1;
	}

	if (strcmp(lpMultiByteStr, (char*) expected_lpMultiByteStr) != 0)
	{
		printf("WideCharToMultiByte unexpected string:\n");

		printf("UTF16 String:\n");
		string_hexdump((BYTE*) lpWideCharStr, cchWideChar * sizeof(WCHAR));

		printf("UTF8 String (actual):\n");
		string_hexdump((BYTE*) lpMultiByteStr, cbMultiByte);

		printf("UTF8 String (expected):\n");
		string_hexdump((BYTE*) expected_lpMultiByteStr, expected_cbMultiByte);

		return -1;
	}

	free(lpMultiByteStr);

	return length;
}

int TestUnicodeConversion(int argc, char* argv[])
{
	/* Letters */

	printf("Letters\n");

	if (convert_utf8_to_utf16(c_cedilla_UTF8, c_cedilla_UTF16, c_cedilla_cchWideChar) < 1)
		return -1;

	if (convert_utf16_to_utf8(c_cedilla_UTF16, c_cedilla_UTF8, c_cedilla_cbMultiByte) < 1)
		return -1;
	
	/* English */

	printf("English\n");

	if (convert_utf8_to_utf16(en_Hello_UTF8, en_Hello_UTF16, en_Hello_cchWideChar) < 1)
		return -1;
	if (convert_utf8_to_utf16(en_HowAreYou_UTF8, en_HowAreYou_UTF16, en_HowAreYou_cchWideChar) < 1)
		return -1;

	if (convert_utf16_to_utf8(en_Hello_UTF16, en_Hello_UTF8, en_Hello_cbMultiByte) < 1)
		return -1;
	if (convert_utf16_to_utf8(en_HowAreYou_UTF16, en_HowAreYou_UTF8, en_HowAreYou_cbMultiByte) < 1)
		return -1;

	/* French */

	printf("French\n");

	if (convert_utf8_to_utf16(fr_Hello_UTF8, fr_Hello_UTF16, fr_Hello_cchWideChar) < 1)
		return -1;
	if (convert_utf8_to_utf16(fr_HowAreYou_UTF8, fr_HowAreYou_UTF16, fr_HowAreYou_cchWideChar) < 1)
		return -1;

	if (convert_utf16_to_utf8(fr_Hello_UTF16, fr_Hello_UTF8, fr_Hello_cbMultiByte) < 1)
		return -1;
	if (convert_utf16_to_utf8(fr_HowAreYou_UTF16, fr_HowAreYou_UTF8, fr_HowAreYou_cbMultiByte) < 1)
		return -1;

	/* Russian */

	printf("Russian\n");

	if (convert_utf8_to_utf16(ru_Hello_UTF8, ru_Hello_UTF16, ru_Hello_cchWideChar) < 1)
		return -1;
	if (convert_utf8_to_utf16(ru_HowAreYou_UTF8, ru_HowAreYou_UTF16, ru_HowAreYou_cchWideChar) < 1)
		return -1;

	if (convert_utf16_to_utf8(ru_Hello_UTF16, ru_Hello_UTF8, ru_Hello_cbMultiByte) < 1)
		return -1;
	if (convert_utf16_to_utf8(ru_HowAreYou_UTF16, ru_HowAreYou_UTF8, ru_HowAreYou_cbMultiByte) < 1)
		return -1;

	/* Arabic */

	printf("Arabic\n");

	if (convert_utf8_to_utf16(ar_Hello_UTF8, ar_Hello_UTF16, ar_Hello_cchWideChar) < 1)
		return -1;
	//if (convert_utf8_to_utf16(ar_HowAreYou_UTF8, ar_HowAreYou_UTF16, ar_HowAreYou_cchWideChar) < 1)
	//	return -1;

	if (convert_utf16_to_utf8(ar_Hello_UTF16, ar_Hello_UTF8, ar_Hello_cbMultiByte) < 1)
		return -1;
	if (convert_utf16_to_utf8(ar_HowAreYou_UTF16, ar_HowAreYou_UTF8, ar_HowAreYou_cbMultiByte) < 1)
		return -1;

	/* Chinese */

	printf("Chinese\n");

	if (convert_utf8_to_utf16(ch_Hello_UTF8, ch_Hello_UTF16, ch_Hello_cchWideChar) < 1)
		return -1;
	if (convert_utf8_to_utf16(ch_HowAreYou_UTF8, ch_HowAreYou_UTF16, ch_HowAreYou_cchWideChar) < 1)
		return -1;

	if (convert_utf16_to_utf8(ch_Hello_UTF16, ch_Hello_UTF8, ch_Hello_cbMultiByte) < 1)
		return -1;
	if (convert_utf16_to_utf8(ch_HowAreYou_UTF16, ch_HowAreYou_UTF8, ch_HowAreYou_cbMultiByte) < 1)
		return -1;

	return 0;
}