#pragma once

#include <string>

#include <sstream>

#include <iostream>

#include <vector>

#include <locale>

#include <codecvt>

#include <relpipe/protocol/constants.h>

#include "../../include/relpipe/reader/RelpipeReaderException.h"

#include "../../include/relpipe/reader/typedefs.h"

#include "../DataTypeReader.h"

namespace relpipe {

namespace reader {

namespace types {

using namespace relpipe::protocol;

using namespace relpipe::reader;

/**

 * The prototype does not recognize any encoding,

 * it just works with c++ strings in encoding default to given platform. 

 * In the real implementation of relational pipes, there will be DataTypes for particular encodings.

 */

class StringDataTypeReader : public DataTypeReader<string_t> {

private:

	IntegerDataTypeReader integerType;

	std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.

public:

	StringDataTypeReader() : DataTypeReader<string_t>(TypeId::STRING, DATA_TYPE_CODE_STRING) {

	}

	string_t readValue(std::istream &input) override {

		integer_t length = integerType.readValue(input);

		// TODO: check maximum length of single field

		// if (length > 4000) throw RelpipeException("data too long", EXIT_CODE_DATA_ERROR);

		std::vector<char> buf(length);

		input.read(buf.data(), length);

		if (input.good()) {

			return convertor.from_bytes(std::string(buf.data(), length));

		} else {

			throw RelpipeReaderException(L"Error while reading string from the stream.");

		}

	}

	string_t toString(const string_t &value) override {

		return value;

	}

};

}

}

}