<?php

namespace wellrested;

class Route {

    const RE_SLUG = '[0-9a-zA-Z\-_]+';
    const RE_NUM = '[0-9]+';
    const RE_ALPHA = '[a-zA-Z]+';
    const RE_ALPHANUM = '[0-9a-zA-Z]+';

    static public $defaultVariablePattern = self::RE_SLUG;

    public $pattern;
    public $handler;
    public $handlerPath;


    public function __construct($pattern, $handler, $handlerPath=null) {
        $this->pattern = $pattern;
        $this->handler = $handler;
        $this->handlerPath = $handlerPath;
    }

    static public function newFromUriTemplate($uriTemplate, $handler, $handlerPath=null, $variables=null) {

        $pattern = '';

        if ($uriTemplate[0] === '/') {
            $uriTemplate = substr($uriTemplate, 1);
        }

        $parts = explode('/', $uriTemplate);

        // TODO: Look up what characters are legal in Level 1 template expressions.

        $expressionPattern = '/{([a-zA-Z]+)}/';

        foreach ($parts as $part) {

            $pattern .= '\/';

            if (preg_match($expressionPattern, $part, $matches)) {

                $variablePattern = self::$defaultVariablePattern;

                if (count($matches) === 2) {

                    $variableName = $matches[1];

                    if (isset($groups[$variableName])) {
                        $variablePattern = $groups[$variableName];
                    }

                }

                $pattern .= sprintf('(?<%s>%s)', $variableName, $variablePattern);

            } else {

                $pattern .= $part;

            }

        }

        $pattern = '/^' . $pattern . '$/';

        $klass = __CLASS__;
        return new $klass($pattern, $handler, $handlerPath);

    }

}

?>