#include <gtest/gtest.h>

#include <limits>
#define NOMINMAX
#include <Windows.h>
#include <tchar.h>
#include "basis/primitive.h"
#include "util/string_ex2.h"

template <typename T>
void test_int2dec(T value, ptrdiff_t lenExpected, const wchar_t* strExpected)
{
	wchar_t buff[int2dec_destBufferSufficientLength<T>()];
	ptrdiff_t len = int2dec(value, buff);
	EXPECT_EQ(len, lenExpected);
	EXPECT_STREQ(buff, strExpected);
}

template <typename T>
void test_plusminus(T plusValue, ptrdiff_t lenExpected, const wchar_t* strExpected)
{
	test_int2dec(plusValue, lenExpected, strExpected);
	test_int2dec(-plusValue, 1+lenExpected, (std::wstring(L"-")+strExpected).c_str());
}

static
void test_32_64_plus_minus(int value, ptrdiff_t lenExpected, const wchar_t* strExpected)
{
	test_plusminus<int32_t>(value, lenExpected, strExpected);
	test_plusminus<int64_t>(value, lenExpected, strExpected);
}

TEST(int2dec_test, zero)
{
	test_int2dec<int32_t>(0, 1, L"0");
	test_int2dec<int64_t>(0, 1, L"0");
}

TEST(int2dec_test, digits)
{
	test_32_64_plus_minus(2, 1, L"2");
	test_32_64_plus_minus(3, 1, L"3");
	test_32_64_plus_minus(4, 1, L"4");
	test_32_64_plus_minus(5, 1, L"5");
	test_32_64_plus_minus(6, 1, L"6");
	test_32_64_plus_minus(7, 1, L"7");
	test_32_64_plus_minus(8, 1, L"8");
	test_32_64_plus_minus(9, 1, L"9");
}

TEST(int2dec_test, max)
{
	test_int2dec<int32_t>(std::numeric_limits<int32_t>::max(), 10, L"2147483647");
	test_int2dec<int64_t>(std::numeric_limits<int64_t>::max(), 19, L"9223372036854775807");
}

TEST(int2dec_test, min)
{
	test_int2dec<int32_t>(std::numeric_limits<int32_t>::min(), 11, L"-2147483648");
	test_int2dec<int64_t>(std::numeric_limits<int64_t>::min(), 20, L"-9223372036854775808");
}

TEST(int2dec_test, group_sequence)
{
	test_32_64_plus_minus(1, 1, L"1");
	test_32_64_plus_minus(12, 2, L"12");
	test_32_64_plus_minus(123, 3, L"123");
	test_32_64_plus_minus(1234, 4, L"1234");
	test_32_64_plus_minus(12345, 5, L"12345");
	test_32_64_plus_minus(123456, 6, L"123456");
	test_32_64_plus_minus(1234567, 7, L"1234567");
	test_32_64_plus_minus(12345678, 8, L"12345678");
	test_32_64_plus_minus(123456789, 9, L"123456789");
	test_32_64_plus_minus(1234567890, 10, L"1234567890");
}