/**

 * 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 {

/**

 * This tr-sql CLI options are inspired by tr-guile options.

 * These configurations are independent and might diverge, but when possible, they should share same option names and same logic for common parts.

 */

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 addRelation(Configuration& c, RelationConfiguration& currentRelation) {

		if (currentRelation.relation.size()) {

			c.relationConfigurations.push_back(currentRelation);

			currentRelation = RelationConfiguration();

		}

	}

	relpipe::writer::TypeId parseTypeId(const string_t& value) {

		using t = relpipe::writer::TypeId;

		if (value == L"string") return t::STRING;

		else if (value == L"integer") return t::INTEGER;

		else if (value == L"boolean") return t::BOOLEAN;

		else throw relpipe::cli::RelpipeCLIException(L"Unable to parse TypeId: " + value, relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);

	}

public:

	static const string_t OPTION_RELATION;

	static const string_t OPTION_OUTPUT_ATTRIBUTE;

	static const string_t OPTION_INPUT_ATTRIBUTES_APPEND;

	static const string_t OPTION_INPUT_ATTRIBUTES_PREPEND;

	static const string_t OPTION_DEBUG_VARIABLE_MAPPING;

	static const string_t OPTION_BEFORE_RECORDS;

	static const string_t OPTION_AFTER_RECORDS;

	static const string_t OPTION_FOR_EACH;

	static const string_t OPTION_DROP;

	static const string_t OPTION_DEFINE;

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

		Configuration c;

		RelationConfiguration currentRelation;

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

			string_t option = readNext(arguments, i);

			if (option == OPTION_BEFORE_RECORDS) currentRelation.sqlBeforeRecords = readNext(arguments, i);

			else if (option == OPTION_AFTER_RECORDS) currentRelation.sqlAfterRecords = readNext(arguments, i);

			else if (option == OPTION_FOR_EACH) currentRelation.sqlForEach = readNext(arguments, i);

			else if (option == OPTION_DROP) currentRelation.drop = true;

			else if (option == OPTION_INPUT_ATTRIBUTES_APPEND) currentRelation.inputAttributesAppend = true;

			else if (option == OPTION_INPUT_ATTRIBUTES_PREPEND) currentRelation.inputAttributesPrepend = true;

			else if (option == OPTION_DEBUG_VARIABLE_MAPPING) currentRelation.debugVariableMapping = true;

			else if (option == OPTION_RELATION) {

				addRelation(c, currentRelation); // previous relation

				currentRelation.relation = readNext(arguments, i);

			} else if (option == OPTION_OUTPUT_ATTRIBUTE) {

				relpipe::writer::AttributeMetadata attribute;

				attribute.attributeName = readNext(arguments, i);

				attribute.typeId = parseTypeId(readNext(arguments, i));

				currentRelation.writerMetadata.push_back(attribute);

			} else if (option == OPTION_DEFINE) {

				DefinitionRecipe definition;

				definition.name = readNext(arguments, i);

				definition.type = readNext(arguments, i);

				definition.value = readNext(arguments, i);

				if (currentRelation.relation.size()) currentRelation.definitions.push_back(definition);

				else c.definitions.push_back(definition);

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

const string_t CLIParser::OPTION_OUTPUT_ATTRIBUTE = L"--output-attribute";

const string_t CLIParser::OPTION_INPUT_ATTRIBUTES_APPEND = L"--input-attributes-append";

const string_t CLIParser::OPTION_INPUT_ATTRIBUTES_PREPEND = L"--input-attributes-prepend";

const string_t CLIParser::OPTION_DEBUG_VARIABLE_MAPPING = L"--debug-variable-mapping";

const string_t CLIParser::OPTION_BEFORE_RECORDS = L"--before-records";

const string_t CLIParser::OPTION_AFTER_RECORDS = L"--after-records";

const string_t CLIParser::OPTION_FOR_EACH = L"--for-each";

const string_t CLIParser::OPTION_DROP = L"--drop";

const string_t CLIParser::OPTION_DEFINE = L"--define";

}

}

}