#pragma once

#include <cstdlib>

#include <iostream>

#include <string>

#include <vector>

#include <algorithm>

namespace relpipe {

namespace in {

namespace cli {

class Command {

public:

	virtual ~Command() = default;

	/**

	 * Processes the inputs (stream + arguments) and generates output in the relational pipes format.

	 * 

	 * @param input usually STDIN, may not be used if all data are passed as CLI arguments

	 * @param output usually STDOUT, relational data is passed here

	 * @param command command name, usualy not needed, may be significant if the same Command instance is used for several commands

	 * @param arguments CLI arguments containing data or parameters (format is specific to each command)

	 */

	virtual void process(std::istream& input, std::ostream& output, const relpipe::writer::string_t& command, const std::vector<relpipe::writer::string_t> &arguments) = 0;

};

}

}

}