#include <psemek/test/test.hpp>
#include <psemek/util/pretty_print.hpp>

#include <map>
#include <set>
#include <string>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <chrono>

namespace psemek::test
{

	static std::map<std::string, void(*)()> tests;

	void add_test_case(char const * name, void(*f)())
	{
		std::string pname(name);
		std::replace(pname.begin(), pname.end(), '_', '/');

		if (tests.count(pname))
		{
			std::cerr << "Test " << pname << " already registered" << std::endl;
			std::exit(EXIT_FAILURE);
		}

		tests[pname] = f;
	}

}

int main(int argc, char ** argv)
{
	std::set<std::string> tests;
	if (argc == 1)
	{
		for (auto const & p : psemek::test::tests)
			tests.insert(p.first);
	}
	else
	{
		for (int a = 1; a < argc; ++a)
		{
			std::string pattern = std::string(argv[a]);
			if (pattern.empty())
			{
				std::cerr << "Empty test case pattern in argument list" << std::endl;
				std::exit(EXIT_FAILURE);
			}
			if (pattern.back() != '/')
				pattern += "/";
			for (auto const & p : psemek::test::tests)
			{
				if (p.first == argv[a] || p.first.starts_with(pattern))
					tests.insert(p.first);
			}
		}
	}

	std::size_t test_count = tests.size();

	std::size_t const test_index_len = std::ceil(std::log10(test_count + 1));

	std::string const indent = std::string(2 * test_index_len + 6, ' ');

	std::size_t max_name_length = 0;
	for (auto const & name : tests)
		max_name_length = std::max(max_name_length, name.size());

	std::size_t success = 0;

	using clock = std::chrono::high_resolution_clock;

	auto all_start = clock::now();

	std::size_t i = 0;
	for (auto const & name : tests)
	{
		++i;

		std::cout
			<< '[' << std::setfill(' ') << std::setw(test_index_len) << std::right << i << '/' << test_count << "] "
			<< std::left << std::setfill('.') << std::setw(max_name_length + 5) << name;

		try
		{
			auto start = clock::now();
			psemek::test::tests[name]();
			auto end = clock::now();
			std::cout << "ok (" << psemek::util::pretty(end - start, std::chrono::milliseconds{1}) << ")" << std::endl;
			++success;
		}
		catch (psemek::test::failure const & e)
		{
			std::cout << "failure" << std::endl;
			std::cout << indent << "Reason:   " << e.message() << std::endl;
			std::cout << indent << "Location: " << e.location() << std::endl;
		}
		catch (std::exception const & e)
		{
			std::cout << "failure: " << e.what() << std::endl;
		}
		catch (...)
		{
			std::cout << "failure: (unknown exception)" << std::endl;
		}
	}

	auto all_end = clock::now();

	std::cout << std::endl;
	std::cout << success << '/' << test_count << " passed (" << psemek::util::pretty(all_end - all_start, std::chrono::milliseconds{1}) << ")" << std::endl;

	if (success <= test_count)
		return EXIT_FAILURE;
}