#include <iostream>

#include <boost/program_options.hpp>

#include <anthem/AST.h>
#include <anthem/Context.h>
#include <anthem/Translation.h>

int main(int argc, char **argv)
{
	anthem::Context context;

	namespace po = boost::program_options;

	po::options_description description("Allowed options");
	description.add_options()
		("help,h", "Display this help message")
		("version,v", "Display version information")
		("input,i", po::value<std::vector<std::string>>(), "Input files")
		("simplify,s", po::bool_switch(&context.performSimplification), "Simplify the output")
		("complete,c", po::bool_switch(&context.performCompletion), "Perform completion")
		("color", po::value<std::string>()->default_value("auto"), "Colorize output (always, never, auto)")
		("parentheses", po::value<std::string>()->default_value("normal"), "Parenthesis style (normal, full)")
		("log-priority,p", po::value<std::string>()->default_value("warning"), "Log messages starting from this priority (debug, info, warning, error)");

	po::positional_options_description positionalOptionsDescription;
	positionalOptionsDescription.add("input", -1);

	po::variables_map variablesMap;

	const auto printHelp =
		[&]()
		{
			std::cout
				<< "Usage: anthem [options] file..." << std::endl
				<< "Translate ASP programs to the language of first-order theorem provers." << std::endl << std::endl
				<< description;
		};

	try
	{
		po::store(po::command_line_parser(argc, argv)
			.options(description)
			.positional(positionalOptionsDescription)
			.run(),
			variablesMap);
		po::notify(variablesMap);
	}
	catch (const po::error &e)
	{
		context.logger.log(anthem::output::Priority::Error) << e.what();
		printHelp();
		return EXIT_FAILURE;
	}

	if (variablesMap.count("help"))
	{
		printHelp();
		return EXIT_SUCCESS;
	}

	if (variablesMap.count("version"))
	{
		std::cout << "anthem version 0.1.7-git" << std::endl;
		return EXIT_SUCCESS;
	}

	const auto colorPolicyString = variablesMap["color"].as<std::string>();

	if (colorPolicyString == "auto")
		context.logger.setColorPolicy(anthem::output::ColorStream::ColorPolicy::Auto);
	else if (colorPolicyString == "never")
		context.logger.setColorPolicy(anthem::output::ColorStream::ColorPolicy::Never);
	else if (colorPolicyString == "always")
		context.logger.setColorPolicy(anthem::output::ColorStream::ColorPolicy::Always);
	else
	{
		context.logger.log(anthem::output::Priority::Error) << "unknown color policy “" << colorPolicyString << "”";
		context.logger.errorStream() << std::endl;
		printHelp();
		return EXIT_FAILURE;
	}

	const auto parenthesisStyle = variablesMap["parentheses"].as<std::string>();

	if (parenthesisStyle == "normal")
		context.parenthesisStyle = anthem::ast::ParenthesisStyle::Normal;
	else if (parenthesisStyle == "full")
		context.parenthesisStyle = anthem::ast::ParenthesisStyle::Full;
	else
	{
		context.logger.log(anthem::output::Priority::Error) << "unknown parenthesis style “" << parenthesisStyle << "”";
		context.logger.errorStream() << std::endl;
		printHelp();
		return EXIT_FAILURE;
	}

	const auto logPriorityString = variablesMap["log-priority"].as<std::string>();

	try
	{
		const auto logPriority = anthem::output::priorityFromName(logPriorityString.c_str());
		context.logger.setLogPriority(logPriority);
	}
	catch (const std::exception &e)
	{
		context.logger.log(anthem::output::Priority::Error) << "unknown log priorty “" << logPriorityString << "”";
		context.logger.errorStream() << std::endl;
		printHelp();
		return EXIT_FAILURE;
	}

	try
	{
		if (variablesMap.count("input"))
		{
			const auto &inputFiles = variablesMap["input"].as<std::vector<std::string>>();
			anthem::translate(inputFiles, context);
		}
		else
			anthem::translate("std::cin", std::cin, context);
	}
	catch (const std::exception &e)
	{
		context.logger.log(anthem::output::Priority::Error) << e.what();
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
}