<?php

/*

 * This file is part of the Symfony package.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Symfony\Component\DependencyInjection\ParameterBag;

use Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException;

use Symfony\Component\DependencyInjection\Exception\ParameterCircularReferenceException;

use Symfony\Component\DependencyInjection\Exception\RuntimeException;

/**

 *

 * @author Fabien Potencier <fabien@symfony.com>

 *

 * @api

 */

class ParameterBag implements ParameterBagInterface

{

    protected $parameters;

    protected $resolved;

    /**

     * Constructor.

     *

     * @param array $parameters An array of parameters

     *

     * @api

     */

    public function __construct(array $parameters = array())

    {

        $this->parameters = array();

        $this->add($parameters);

        $this->resolved = false;

    }

    /**

     * Clears all parameters.

     *

     * @api

     */

    public function clear()

    {

        $this->parameters = array();

    }

    /**

     * Adds parameters to the service container parameters.

     *

     * @param array $parameters An array of parameters

     *

     * @api

     */

    public function add(array $parameters)

    {

        foreach ($parameters as $key => $value) {

            $this->parameters[strtolower($key)] = $value;

        }

    }

    /**

     * Gets the service container parameters.

     *

     * @return array An array of parameters

     *

     * @api

     */

    public function all()

    {

        return $this->parameters;

    }

    /**

     * Gets a service container parameter.

     *

     * @param string $name The parameter name

     *

     * @return mixed  The parameter value

     *

     * @throws  ParameterNotFoundException if the parameter is not defined

     *

     * @api

     */

    public function get($name)

    {

        $name = strtolower($name);

        if (!array_key_exists($name, $this->parameters)) {

            throw new ParameterNotFoundException($name);

        }

        return $this->parameters[$name];

    }

    /**

     * Sets a service container parameter.

     *

     * @param string $name  The parameter name

     * @param mixed  $value The parameter value

     *

     * @api

     */

    public function set($name, $value)

    {

        $this->parameters[strtolower($name)] = $value;

    }

    /**

     * Returns true if a parameter name is defined.

     *

     * @param  string  $name       The parameter name

     *

     * @return Boolean true if the parameter name is defined, false otherwise

     *

     * @api

     */

    public function has($name)

    {

        return array_key_exists(strtolower($name), $this->parameters);

    }

    /**

     * Replaces parameter placeholders (%name%) by their values for all parameters.

     */

    public function resolve()

    {

        if ($this->resolved) {

            return;

        }

        $parameters = array();

        foreach ($this->parameters as $key => $value) {

            try {

                $value = $this->resolveValue($value);

                $parameters[$key] = is_string($value) ? str_replace('%%', '%', $value) : $value;

            } catch (ParameterNotFoundException $e) {

                $e->setSourceKey($key);

                throw $e;

            }

        }

        $this->parameters = $parameters;

        $this->resolved = true;

    }

    /**

     * Replaces parameter placeholders (%name%) by their values.

     *

     * @param mixed $value A value

     * @param array $resolving An array of keys that are being resolved (used internally to detect circular references)

     *

     * @return mixed The resolved value

     *

     * @throws ParameterNotFoundException if a placeholder references a parameter that does not exist

     * @throws ParameterCircularReferenceException if a circular reference if detected

     * @throws RuntimeException when a given parameter has a type problem.

     */

    public function resolveValue($value, array $resolving = array())

    {

        if (is_array($value)) {

            $args = array();

            foreach ($value as $k => $v) {

                $args[$this->resolveValue($k, $resolving)] = $this->resolveValue($v, $resolving);

            }

            return $args;

        }

        if (!is_string($value)) {

            return $value;

        }

        return $this->resolveString($value, $resolving);

    }

    /**

     * Resolves parameters inside a string

     *

     * @param string $value     The string to resolve

     * @param array  $resolving An array of keys that are being resolved (used internally to detect circular references)

     *

     * @return string The resolved string

     *

     * @throws ParameterNotFoundException if a placeholder references a parameter that does not exist

     * @throws ParameterCircularReferenceException if a circular reference if detected

     * @throws RuntimeException when a given parameter has a type problem.

     */

    public function resolveString($value, array $resolving = array())

    {

        // we do this to deal with non string values (Boolean, integer, ...)

        // as the preg_replace_callback throw an exception when trying

        // a non-string in a parameter value

        if (preg_match('/^%([^%]+)%$/', $value, $match)) {

            $key = strtolower($match[1]);

            if (isset($resolving[$key])) {

                throw new ParameterCircularReferenceException(array_keys($resolving));

            }

            $resolving[$key] = true;

            return $this->resolved ? $this->get($key) : $this->resolveValue($this->get($key), $resolving);

        }

        $self = $this;

        return preg_replace_callback('/(?<!%)%([^%]+)%/', function ($match) use ($self, $resolving, $value) {

            $key = strtolower($match[1]);

            if (isset($resolving[$key])) {

                throw new ParameterCircularReferenceException(array_keys($resolving));

            }

            $resolved = $self->get($key);

            if (!is_string($resolved) && !is_numeric($resolved)) {

                throw new RuntimeException(sprintf('A string value must be composed of strings and/or numbers, but found parameter "%s" of type %s inside string value "%s".', $key, gettype($resolved), $value));

            }

            $resolved = (string) $resolved;

            $resolving[$key] = true;

            return $self->isResolved() ? $resolved : $self->resolveString($resolved, $resolving);

        }, $value);

    }

    public function isResolved()

    {

        return $this->resolved;

    }

}