/**

 * Relational pipes

 * Copyright © 2019 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, either version 3 of the License, or

 * (at your option) any later version.

 *

 * 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 <relpipe/writer/typedefs.h>

#include <relpipe/cli/CLI.h>

#include <relpipe/cli/RelpipeCLIException.h>

#include "Configuration.h"

namespace relpipe {

namespace tr {

namespace sql {

class CLIParser {

private:

	// FIXME: move common methods/classes to relpipe-lib-cli or relpipe-lib-helper

	string_t readNext(std::vector<string_t> 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);

	}

	void addQuery(Configuration& c, Statement& currentQuery) {

		if (currentQuery.sql.size()) {

			c.statements.push_back(currentQuery);

			currentQuery = Statement();

		}

	}

public:

	static const string_t OPTION_RELATION;

	static const string_t OPTION_PARAMETER;

	Configuration parse(const std::vector<string_t>& arguments) {

		Configuration c;

		Statement currentQuery;

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

			string_t option = readNext(arguments, i);

			if (option == OPTION_RELATION) {

				addQuery(c, currentQuery); // previous relation

				currentQuery.relation = readNext(arguments, i);

				currentQuery.sql = readNext(arguments, i);

			} else if (option == OPTION_PARAMETER) {

				Parameter parameter;

				parameter.value = readNext(arguments, i);

				currentQuery.parameters.push_back(parameter);

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

		}

		addQuery(c, currentQuery); // last relation

		return c;

	}

	virtual ~CLIParser() {

	}

};

// relpipe-tr-sql --relation "tabulka" "SELECT * FROM fstab WHERE id = ?" --parameter "123"

// TODO: --type string/integer/boolean (default is string)

const string_t CLIParser::OPTION_RELATION = L"--relation";

const string_t CLIParser::OPTION_PARAMETER = L"--parameter";

}

}

}