<?php
namespace Szurubooru;

class Router
{
	private $routes;

	public function get($url, callable $function)
	{
		$this->inject('GET', $url, $function);
	}

	public function post($url, callable $function)
	{
		$this->inject('POST', $url, $function);
	}

	public function put($url, callable $function)
	{
		$this->inject('PUT', $url, $function);
	}

	public function delete($url, callable $function)
	{
		$this->inject('DELETE', $url, $function);
	}

	public function handle($method, $request)
	{
		if (!isset($this->routes[$method]))
			throw new \DomainException('Unhandled request method: ' . $method);

		$request = trim($request, '/');
		foreach ($this->routes[$method] as $url => $callback)
		{
			if (!preg_match(self::getRegex($url), $request, $matches))
				continue;

			return $callback($matches);
		}

		throw new \DomainException('Unhandled request address: ' . $request);
	}

	private function inject($method, $url, callable $function)
	{
		if (!isset($this->routes[$method]))
			$this->routes[$method] = [];
		$this->routes[$method][$url] = $function;
	}

	private static function getRegex($url)
	{
		$quotedQuery = preg_quote(trim($url, '/'), '/');
		return '/^' . preg_replace('/\\\?\:([a-zA-Z_-]*)/', '(?P<\1>[^\/]+)', $quotedQuery) . '$/i';
	}
}