<?php

namespace Symfony\Components\Routing;

/*
 * This file is part of the Symfony framework.
 *
 * (c) Fabien Potencier <fabien.potencier@symfony-project.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

/**
 * A Route describes a route and its parameters.
 *
 * @package    Symfony
 * @subpackage Components_Routing
 * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
 */
class Route
{
    protected $pattern;
    protected $defaults;
    protected $requirements;
    protected $options;
    protected $compiled;

    static protected $compilers = array();

    /**
     * Constructor.
     *
     * Available options:
     *
     *  * variable_prefixes:  An array of characters that starts a variable name (: by default)
     *  * segment_separators: An array of allowed characters for segment separators (/ by default)
     *  * variable_regex:     A regex that match a valid variable name ([\w\d_]+ by default)
     *  * text_regex:         A regex that match a valid text  name (.+? by default)
     *  * compiler_class:     A class name able to compile this route instance (RouteCompiler by default)
     *
     * @param string $pattern       The pattern to match
     * @param array  $defaults      An array of default parameter values
     * @param array  $requirements  An array of requirements for parameters (regexes)
     * @param array  $options       An array of options
     */
    public function __construct($pattern, array $defaults = array(), array $requirements = array(), array $options = array())
    {
        $this->setPattern($pattern);
        $this->setDefaults($defaults);
        $this->setRequirements($requirements);
        $this->setOptions($options);
    }

    /**
     * Returns the pattern.
     *
     * @return string The pattern
     */
    public function getPattern()
    {
        return $this->pattern;
    }

    /**
     * Sets the pattern.
     *
     * This method implements a fluent interface.
     *
     * @param string The pattern
     *
     * @return Route The current Route instance
     */
    public function setPattern($pattern)
    {
        $this->pattern = trim($pattern);

        // a route must start with a slash
        if (empty($this->pattern) || '/' !== $this->pattern[0])
        {
            $this->pattern = '/'.$this->pattern;
        }

        return $this;
    }

    /**
     * Returns the options.
     *
     * @return array The options
     */
    public function getOptions()
    {
        return $this->options;
    }

    /**
     * Sets the options.
     *
     * This method implements a fluent interface.
     *
     * @param array The options
     *
     * @return Route The current Route instance
     */
    public function setOptions(array $options)
    {
        $this->options = array_merge(array(
            'variable_prefixes'  => array(':'),
            'segment_separators' => array('/', '.'),
            'variable_regex'     => '[\w\d_]+',
            'text_regex'         => '.+?',
            'compiler_class'     => 'Symfony\\Components\\Routing\\RouteCompiler',
        ), $options);

        return $this;
    }

    /**
     * Get an option value.
     *
     * @param string $name An option name
     *
     * @return mixed The option value
     */
    public function getOption($name)
    {
        return isset($this->options[$name]) ? $this->options[$name] : null;
    }

    /**
     * Returns the defaults.
     *
     * @return array The defaults
     */
    public function getDefaults()
    {
        return $this->defaults;
    }

    /**
     * Sets the defaults.
     *
     * This method implements a fluent interface.
     *
     * @param array The defaults
     *
     * @return Route The current Route instance
     */
    public function setDefaults(array $defaults)
    {
        $this->defaults = $defaults;

        return $this;
    }

    /**
     * Get an default value.
     *
     * @param string $name A variable name
     *
     * @return mixed The default value
     */
    public function getDefault($name)
    {
        return isset($this->defaults[$name]) ? $this->defaults[$name] : null;
    }

    /**
     * Returns the requirements.
     *
     * @return array The requirements
     */
    public function getRequirements()
    {
        return $this->requirements;
    }

    /**
     * Sets the requirements.
     *
     * This method implements a fluent interface.
     *
     * @param array The requirements
     *
     * @return Route The current Route instance
     */
    public function setRequirements(array $requirements)
    {
        $this->requirements = array();
        foreach ($requirements as $key => $regex)
        {
            if ('^' == $regex[0])
            {
                $regex = substr($regex, 1);
            }

            if ('$' == substr($regex, -1))
            {
                $regex = substr($regex, 0, -1);
            }

            $this->requirements[$key] = $regex;
        }

        return $this;
    }

    /**
     * Returns the requirement for the given key.
     *
     * @return string The regex
     */
    public function getRequirement($key)
    {
        return isset($this->requirements[$key]) ? $this->requirements[$key] : null;
    }

    /**
     * Compiles the route.
     *
     * @return CompiledRoute A CompiledRoute instance
     */
    public function compile()
    {
        if (null !== $this->compiled)
        {
            return $this->compiled;
        }

        $class = $this->getOption('compiler_class');

        if (!isset(static::$compilers[$class]))
        {
            static::$compilers[$class] = new $class;
        }

        return $this->compiled = static::$compilers[$class]->compile($this);
    }
}