/**

 * Relational pipes

 * Copyright © 2022 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 3 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

#pragma once

#include <vector>

#include <iostream>

#include <codecvt>

#include <regex>

#include <relpipe/common/type/typedefs.h>

#include <relpipe/cli/CLI.h>

#include <relpipe/cli/RelpipeCLIException.h>

#include "Configuration.h"

namespace relpipe {

namespace out {

namespace socket {

class CLIParser {

private:

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

	relpipe::common::type::StringX readNext(const std::vector<relpipe::common::type::StringX>& arguments, int& i) {

		if (i < arguments.size()) return arguments[i++];

		else throw relpipe::cli::RelpipeCLIException(L"Missing CLI argument" + (i > 0 ? (L" after " + arguments[i - 1]) : L""), relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);

	}

	/**

	 * TODO: use a common method

	 */

	bool parseBoolean(const relpipe::common::type::StringX& value) {

		if (value == L"true") return true;

		else if (value == L"false") return false;

		else throw relpipe::cli::RelpipeCLIException(L"Unable to parse boolean value: " + value + L" (expecting true or false)", relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);

	}

	void setIfMissing(std::vector<Configuration::SocketOption>& options, const std::string& name, const std::string& value, bool includeEmptyValues = true) {

		auto n = convertor.from_bytes(name);

		auto v = convertor.from_bytes(value);

		for (auto o : options) if (o.name == n) return;

		if (value.size() || includeEmptyValues) options.push_back({n, v});

	}

public:

	static const relpipe::common::type::StringX OPTION_RELATION;

	static const relpipe::common::type::StringX OPTION_CONNECTION_STRING;

	static const relpipe::common::type::StringX OPTION_CONNECTION_OPTION;

	Configuration parse(const std::vector<relpipe::common::type::StringX>& arguments) {

		Configuration c;

		relpipe::common::type::StringX connectionString;

		for (int i = 0; i < arguments.size();) {

			relpipe::common::type::StringX option = readNext(arguments, i);

			if (option == OPTION_RELATION) {

				c.relation = readNext(arguments, i);

			} else if (option == OPTION_CONNECTION_STRING) {

				connectionString = readNext(arguments, i);

			} else if (option == OPTION_CONNECTION_OPTION) {

				auto name = readNext(arguments, i);

				auto value = readNext(arguments, i);

				c.options.push_back({name, value});

			} else throw relpipe::cli::RelpipeCLIException(L"Unsupported CLI option: " + option, relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);

		}

		using namespace options;

		// Parse the connection string and convert it to options:

		if (connectionString.size()) {

			std::string connectionStringBytes = convertor.to_bytes(connectionString);

			//                  1                23          4             5                    6        7       8

			std::smatch match;

			if (std::regex_match(connectionStringBytes, match, pattern)) {

				setIfMissing(c.options, OPTION_PROTOCOL, match[1], false);

				setIfMissing(c.options, OPTION_PROTOCOL, match[7], false);

				setIfMissing(c.options, OPTION_HOST, match[3], false);

				setIfMissing(c.options, OPTION_HOST, match[4], false);

				setIfMissing(c.options, OPTION_PORT, match[6], false);

				setIfMissing(c.options, OPTION_PATH, match[8], false);

				if (match[1] == PROTOCOL_TCP) setIfMissing(c.options, OPTION_MODE, MODE_STREAM);

			} else {

				throw relpipe::cli::RelpipeCLIException(L"Invalid connection string: " + connectionString, relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);

			}

		}

		// Set defaults when values are missing:

		setIfMissing(c.options, OPTION_PROTOCOL, PROTOCOL_UDP);

		setIfMissing(c.options, OPTION_ROLE, ROLE_CLIENT);

		setIfMissing(c.options, OPTION_MODE, MODE_DATAGRAM);

		setIfMissing(c.options, OPTION_HOST, "127.0.0.1");

		setIfMissing(c.options, OPTION_PORT, "64000");

		return c;

	}

	virtual ~CLIParser() {

	}

};

const relpipe::common::type::StringX CLIParser::OPTION_RELATION = L"--relation";

const relpipe::common::type::StringX CLIParser::OPTION_CONNECTION_STRING = L"--connection-string";

const relpipe::common::type::StringX CLIParser::OPTION_CONNECTION_OPTION = L"--connection-option";

}

}

}