/**
 * Relational pipes
 * Copyright © 2021 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 <relpipe/common/type/typedefs.h>
#include <relpipe/cli/CLI.h>
#include <relpipe/cli/RelpipeCLIException.h>

#include "Configuration.h"

namespace relpipe {
namespace tr {
namespace cut {

class CLIParser {
private:

	relpipe::common::type::StringX readNext(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);
	}

	RelationConfiguration::ENTITY parseEntity(const relpipe::common::type::StringX& value) {
		if (value == L"relation") return RelationConfiguration::ENTITY::RELATION;
		else if (value == L"attribute") return RelationConfiguration::ENTITY::ATTRIBUTE;
		else throw relpipe::cli::RelpipeCLIException(L"Unable to parse entity value: " + value + L" (expecting „relation“, „attribute“ or „value“)", relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);
	}

	void addRelation(Configuration& c, RelationConfiguration& currentRelation) {
		if (currentRelation.relation.size()) {
			using E = RelationConfiguration::ENTITY;
			currentRelation.relationPattern = currentRelation.caseSensitive[E::RELATION] ? std::wregex(currentRelation.relation) : std::wregex(currentRelation.relation, std::regex_constants::icase);
			for (const relpipe::common::type::StringX& attribute : currentRelation.attributes) currentRelation.attributePatterns.push_back(currentRelation.caseSensitive[E::ATTRIBUTE] ? std::wregex(attribute) : std::wregex(attribute, std::regex_constants::icase));
			c.relationConfigurations.push_back(currentRelation);
			currentRelation = RelationConfiguration();
		}
	}

public:

	static const relpipe::common::type::StringX OPTION_RELATION;
	static const relpipe::common::type::StringX OPTION_ATTRIBUTE;
	static const relpipe::common::type::StringX OPTION_CASE_SENSITIVE;
	static const relpipe::common::type::StringX OPTION_INVERT_MATCH;

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

		for (int i = 0; i < arguments.size();) {
			relpipe::common::type::StringX option = readNext(arguments, i);

			if (option == OPTION_RELATION) {
				addRelation(c, currentRelation); // previous relation
				currentRelation.relation = readNext(arguments, i);
			} else if (option == OPTION_ATTRIBUTE) {
				currentRelation.attributes.push_back(readNext(arguments, i));
			} else if (option == OPTION_CASE_SENSITIVE) {
				RelationConfiguration::ENTITY entity = parseEntity(readNext(arguments, i));
				currentRelation.caseSensitive[entity] = parseBoolean(readNext(arguments, i));
			} else if (option == OPTION_INVERT_MATCH) {
				RelationConfiguration::ENTITY entity = parseEntity(readNext(arguments, i));
				currentRelation.invertMatch[entity] = parseBoolean(readNext(arguments, i));
			} else throw relpipe::cli::RelpipeCLIException(L"Unsupported CLI option: " + option, relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);
		}
		addRelation(c, currentRelation); // last relation

		return c;
	}

	virtual ~CLIParser() {
	}
};

const relpipe::common::type::StringX CLIParser::OPTION_RELATION = L"--relation";
const relpipe::common::type::StringX CLIParser::OPTION_ATTRIBUTE = L"--attribute";
const relpipe::common::type::StringX CLIParser::OPTION_CASE_SENSITIVE = L"--case-sensitive";
const relpipe::common::type::StringX CLIParser::OPTION_INVERT_MATCH = L"--invert-match";

}
}
}