#include "getopt.h"
#include "matrix.hpp"
#include "maze.hpp"
#include "utils.hpp"
#include "vector2.hpp"
#include <iostream>
#include <memory>
#include <random>
#include <string>

void optarg_error(int arg, std::string error)
{
	std::cout << "Error: Invalid option argument for -" << arg << ". " << error
			  << std::endl;
	exit(EXIT_FAILURE);
}

void validate_start_coords(unsigned int start_x, unsigned int start_y, unsigned int width,
						   unsigned int height)
{
	if (start_x >= width)
		throw "The x start coordinate cannot be higher than or equal to the maze's width";

	if (start_y >= height)
		throw "The y start coordinate cannot be higher than or equal to the maze's "
			  "height";
}

/**
 * Parses a unsigned integer command-line argument.
 *
 * @param num_dst A pointer to a place to store the result value
 * @param arg The command-line argument character
 * @param check_zero Whether or not to make sure that the result is not zero
 */
void parse_uint_arg(unsigned int *num_dst, int arg, bool check_zero = false)
{
	try
	{
		*num_dst = str_to_uint(std::string(optarg));

		if (check_zero && *num_dst == 0)
			throw "It should not be 0";
	}
	catch (const char *error)
	{
		optarg_error(arg, std::string(error));
	}
}

const struct option options[] = {{"width", required_argument, NULL, 'w'},
								 {"height", required_argument, NULL, 'h'},
								 {"wall", required_argument, NULL, 'W'},
								 {"seed", required_argument, NULL, 's'},
								 {"start-x", required_argument, NULL, 'x'},
								 {"start-y", required_argument, NULL, 'y'},
								 {"help", no_argument, NULL, 0},
								 {NULL, 0, NULL, 0}};

int main(int argc, char *argv[])
{
	unsigned int maze_width = 40U;
	unsigned int maze_height = 20U;

	std::shared_ptr<unsigned int> start_x = nullptr;
	std::shared_ptr<unsigned int> start_y = nullptr;

	std::unique_ptr<std::mt19937> random_gen = nullptr;

	std::string wall = "█";

	int arg;
	while ((arg = getopt_long(argc, argv, "w:h:W:s:x:y:", options, nullptr)) != -1)
	{
		switch (arg)
		{
		case 'w':
			parse_uint_arg(&maze_width, arg, true);
			break;
		case 'h':
			parse_uint_arg(&maze_height, arg, true);
			break;
		case 'x':
			start_x = std::make_shared<unsigned int>();
			parse_uint_arg(start_x.get(), arg);
			break;
		case 'y':
			start_y = std::make_shared<unsigned int>();
			parse_uint_arg(start_y.get(), arg);
			break;
		case 'W':
			wall = optarg;
			break;
		case 's':
			unsigned int seed;
			parse_uint_arg(&seed, arg, true);

			random_gen = std::make_unique<std::mt19937>(seed);
			break;
		case 0:
			std::cout
				<< "Usage: " << argv[0]
				<< " [OPTION]...\n\n"
				   "Options:\n"
				   "  -w, --width WIDTH       The width of the maze (Default: 40)\n"
				   "  -h, --height HEIGHT     The height of the maze (Default: 20)\n"
				   "  -x, --start-x X         The x coordinate for the start "
				   "position "
				   "(Default: random)\n"
				   "  -y, --start-y Y         The y coordinate for the start "
				   "position "
				   "(Default: random)\n"
				   "  -W, --wall WALL         Single character used as maze walls "
				   "(Default: '█')\n"
				   "  -s, --seed SEED         The randomization seed used for maze "
				   "generation\n"
				   "  --help                  Displays usage information"
				<< std::endl;
			return EXIT_SUCCESS;
		case '?':
			std::cout << "\nTry '" << argv[0] << " --help' for more information"
					  << std::endl;
			return EXIT_FAILURE;
		}
	}

	if (random_gen == nullptr)
	{
		std::random_device random_device;
		random_gen = std::make_unique<std::mt19937>(random_device());
	}

	if (start_x == nullptr)
	{
		auto random_dist =
			std::uniform_int_distribution<unsigned int>(0, maze_width - 1U);

		start_x = std::make_unique<unsigned int>(random_dist(*random_gen));
	}

	if (start_y == nullptr)
	{
		auto random_dist =
			std::uniform_int_distribution<unsigned int>(0, maze_height - 1U);

		start_y = std::make_unique<unsigned int>(random_dist(*random_gen));
	}

	try
	{
		validate_start_coords(*start_x, *start_y, maze_width, maze_height);
	}
	catch (const char *error)
	{
		std::cout << "Error: " << error << std::endl;
		return EXIT_FAILURE;
	}

	Matrix<std::string> matrix(maze_height * 2U + 1U, maze_width * 2U + 1U);

	matrix.fill(wall);

	auto start_pos = std::make_shared<Vector2>(*start_x * 2U + 1U, *start_y * 2U + 1U);

	matrix_to_maze<std::string>(&matrix, start_pos, " ", *random_gen);

	matrix.print();
}