/**
 * Relational pipes
 * Copyright © 2018 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/>.
 */
#include <cstdlib>
#include <fstream>
#include <memory>
#include <regex>
#include <algorithm>
#include <unistd.h>

#include <relpipe/writer/RelationalWriter.h>
#include <relpipe/writer/RelpipeWriterException.h>
#include <relpipe/writer/Factory.h>
#include <relpipe/writer/TypeId.h>

#include <relpipe/cli/CLI.h>

#include "CLIParser.h"
#include "Configuration.h"
#include "FstabCommand.h"

using namespace relpipe::cli;
using namespace relpipe::writer;
using namespace relpipe::in::fstab;

int main(int argc, char** argv) {
	setlocale(LC_ALL, "");
	CLI::untieStdIO();
	CLI cli(argc, argv);

	int resultCode = CLI::EXIT_CODE_UNEXPECTED_ERROR;

	try {
		CLIParser cliParser;
		Configuration configuration = cliParser.parse(cli.arguments());
		FstabCommand command;
		std::shared_ptr<RelationalWriter> writer(Factory::create(std::cout));

		if (isatty(fileno(stdin))) {
			/**
			 * Our program is executed on TTY without input stream redirection → read from default file location.
			 * e.g. $ relpipe-in-fstab | …
			 * (we don't expect that user is writing the content of fstab by hand on the terminal)
			 */
			ifstream s("/etc/fstab");
			command.process(s, writer, configuration);
		} else {
			/**
			 * Input stream comes from a file or is piped from other command → read it instead of default file.
			 * e.g. $ cat /etc/fstab | grep '/mnt/' | relpipe-in-fstab | …
			 * or $ relpipe-in-fstab < /etc/fstab | … # without UUoC
			 * or $ ssh example.com cat /etc/fstab | relpipe-in-fstab | …
			 * or $ cat | relpipe-in-fstab | … # user writes the fstab content by hand
			 * or $ cat /etc/mtab | relpipe-in-fstab | relpipe-out-tabular | less -RSi # currently mounted filesystems
			 */
			command.process(std::cin, writer, configuration);
		}

		resultCode = CLI::EXIT_CODE_SUCCESS;
	} catch (RelpipeCLIException e) {
		fwprintf(stderr, L"Caught CLI exception: %ls\n", e.getMessage().c_str());
		fwprintf(stderr, L"Debug: Input stream: eof=%ls, lastRead=%d\n", (cin.eof() ? L"true" : L"false"), cin.gcount());
		resultCode = e.getExitCode();
	} catch (RelpipeWriterException e) {
		fwprintf(stderr, L"Caught Writer exception: %ls\n", e.getMessage().c_str());
		fwprintf(stderr, L"Debug: Input stream: eof=%ls, lastRead=%d\n", (cin.eof() ? L"true" : L"false"), cin.gcount());
		resultCode = CLI::EXIT_CODE_DATA_ERROR;
	}

	return resultCode;
}