/**

 * 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, 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/writer/typedefs.h>

#include <relpipe/cli/CLI.h>

#include <relpipe/cli/RelpipeCLIException.h>

#include "Configuration.h"

#include "FileAttributeFinder.h"

namespace relpipe {

namespace in {

namespace filesystem {

class CLIParser {

private:

	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 addField(Configuration& c, string_t& group, string_t& name, std::vector<string_t>& aliases, std::vector<string_t>& options) {

		if (group.size()) {

			c.fields.push_back(RequestedField(group, name, aliases, options));

			group.clear();

			name.clear();

			aliases.clear();

			options.clear();

		}

	}

public:

	static const string_t OPTION_FILE;

	static const string_t OPTION_XATTR;

	static const string_t OPTION_STREAMLET;

	static const string_t OPTION_AS;

	static const string_t OPTION_OPTION;

	static const string_t OPTION_RELATION;

	static const string_t OPTION_PARALLEL;

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

		Configuration c;

		{

			string_t currentGroup;

			string_t currentName;

			std::vector<string_t> currentAliases;

			std::vector<string_t> currentOptions;

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

				string_t option = readNext(arguments, i);

				if (option == CLIParser::OPTION_FILE || option == CLIParser::OPTION_XATTR || option == CLIParser::OPTION_STREAMLET) {

					addField(c, currentGroup, currentName, currentAliases, currentOptions); // previous field

					currentGroup = option.substr(2); // cut off --

					currentName = readNext(arguments, i);

				} else if (option == OPTION_AS) {

					currentAliases.push_back(readNext(arguments, i));

				} else if (option == OPTION_OPTION) {

					currentOptions.push_back(readNext(arguments, i));

					currentOptions.push_back(readNext(arguments, i));

				} else if (option == OPTION_RELATION) {

					c.relation = readNext(arguments, i);

				} else if (option == OPTION_PARALLEL) {

					c.parallelism = std::stoi(readNext(arguments, i));

					if (c.parallelism < 1) throw relpipe::cli::RelpipeCLIException(L"Number of parallel processes must be 1 or more.", relpipe::cli::CLI::EXIT_CODE_BAD_CLI_ARGUMENTS);

				} else {

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

				}

			}

			addField(c, currentGroup, currentName, currentAliases, currentOptions); // last field

		}

		if (c.fields.empty()) {

			// default set of fields:

			c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_PATH_ORIGINAL));

			// c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_PATH_ABSOLUTE));

			// c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_PATH_CANONICAL));

			// c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_NAME));

			c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_TYPE));

			// c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_TYPE,{L"type_a", L"type_b"})); // one field → two attributes with same value

			// c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_SYMLINK_TARGET_TYPE));

			// c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_SYMLINK_TARGET));

			c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_SIZE));

			c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_OWNER));

			c.fields.push_back(RequestedField(RequestedField::GROUP_FILE, FileAttributeFinder::FIELD_GROUP));

			// c.fields.push_back(RequestedField(RequestedField::GROUP_XATTR, L"user.xdg.origin.url"));

		}

		for (int i = 0; i < c.fields.size(); i++) c.fields[i].id = i;

		return c;

	}

	virtual ~CLIParser() {

	}

};

const string_t CLIParser::OPTION_FILE = L"--" + RequestedField::GROUP_FILE;

const string_t CLIParser::OPTION_XATTR = L"--" + RequestedField::GROUP_XATTR;

const string_t CLIParser::OPTION_STREAMLET = L"--" + RequestedField::GROUP_STREAMLET;

const string_t CLIParser::OPTION_AS = L"--as";

const string_t CLIParser::OPTION_OPTION = L"--option";

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

const string_t CLIParser::OPTION_PARALLEL = L"--parallel";

}

}

}