#include <cpps/cpps.h>
#include <iostream>
#include <string>
#include <fstream>

using namespace cpps;
using namespace std;

static const std::string base64_chars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";


static inline bool is_base64(unsigned char c)
{
	return (isalnum(c) || (c == '+') || (c == '/'));
}

#if defined(__APPLE__) && defined(__MACH__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wimplicit-int-conversion"
#endif
std::string base64_encode_cuc(unsigned char const* bytes_to_encode, size_t in_len)
{

	std::string ret;
	int i = 0, j = 0;
	unsigned char char_array_3[3], char_array_4[4];

	while (in_len--)
	{
		char_array_3[i++] = *(bytes_to_encode++);
		if (i == 3)
		{
			char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
			char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
			char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
			char_array_4[3] = char_array_3[2] & 0x3f;

			for (i = 0; (i < 4); i++)
				ret += base64_chars[char_array_4[i]];
			i = 0;
		}
	}

	if (i)
	{
		for (j = i; j < 3; j++)
			char_array_3[j] = '0円';

		char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
		char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
		char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
		char_array_4[3] = char_array_3[2] & 0x3f;

		for (j = 0; (j < i + 1); j++)
			ret += base64_chars[char_array_4[j]];

		while ((i++ < 3))
			ret += '=';

	}

	return ret;

}
std::string base64_encode(cpps_value v)
{
	cpps_cppsclassvar* cppsclassvar = (cpps_cppsclassvar*)v.value.domain;
	std::string* tmpStr = (std::string*)cppsclassvar->getclsptr();
	return base64_encode_cuc((unsigned char const*)tmpStr->c_str(), tmpStr->size());
}
std::string base64_decode(cpps_value v)
{
	cpps_cppsclassvar* cppsclassvar = (cpps_cppsclassvar*)v.value.domain;
	std::string* tmpStr = (std::string*)cppsclassvar->getclsptr();
	std::string& encoded_string = *tmpStr;
	size_t in_len = encoded_string.size();
	size_t i = 0, j = 0, in_ = 0;
	unsigned char char_array_4[4], char_array_3[3];
	std::string ret;

	while (in_len-- && (encoded_string[in_] != '=') && is_base64(encoded_string[in_]))
	{
		char_array_4[i++] = encoded_string[in_]; in_++;
		if (i == 4) {
			for (i = 0; i < 4; i++)
				char_array_4[i] = (unsigned char)base64_chars.find(char_array_4[i]);

			char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
			char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
			char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

			for (i = 0; (i < 3); i++)
				ret += char_array_3[i];
			i = 0;
		}
	}

	if (i)
	{
		for (j = i; j < 4; j++)
			char_array_4[j] = 0;

		for (j = 0; j < 4; j++)
			char_array_4[j] = (unsigned char)base64_chars.find(char_array_4[j]);

		char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
		char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
		char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

		for (j = 0; (j < i - 1); j++)
			ret += char_array_3[j];
	}

	return ret;
}

#if defined(__APPLE__) && defined(__MACH__)
#pragma clang diagnostic pop
#endif
cpps_export_void cpps_attach(cpps::C* c)
{

	cpps::cpps_init_cpps_class(c);

	cpps::_module(c, "base64")[
		def("encode",base64_encode),
		def("decode",base64_decode)
	];



 
}
cpps_export_void cpps_detach(cpps::C * c)
{
	cpps::_unmodule(c, "base64");
}

cpps_export_finish