<?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\Loader;

use Symfony\Component\DependencyInjection\DefinitionDecorator;

use Symfony\Component\DependencyInjection\Alias;

use Symfony\Component\DependencyInjection\ContainerInterface;

use Symfony\Component\DependencyInjection\Definition;

use Symfony\Component\DependencyInjection\Reference;

use Symfony\Component\DependencyInjection\ContainerBuilder;

use Symfony\Component\Config\Resource\FileResource;

use Symfony\Component\Yaml\Yaml;

/**

 * YamlFileLoader loads YAML files service definitions.

 *

 * The YAML format does not support anonymous services (cf. the XML loader).

 *

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

 */

class YamlFileLoader extends FileLoader

{

    /**

     * Loads a Yaml file.

     *

     * @param mixed  $file The resource

     * @param string $type The resource type

     */

    public function load($file, $type = null)

    {

        $path = $this->locator->locate($file);

        $content = $this->loadFile($path);

        $this->container->addResource(new FileResource($path));

        // empty file

        if (null === $content) {

            return;

        }

        // imports

        $this->parseImports($content, $file);

        // parameters

        if (isset($content['parameters'])) {

            foreach ($content['parameters'] as $key => $value) {

                $this->container->setParameter($key, $this->resolveServices($value));

            }

        }

        // extensions

        $this->loadFromExtensions($content);

        // services

        $this->parseDefinitions($content, $file);

    }

    /**

     * Returns true if this class supports the given resource.

     *

     * @param mixed  $resource A resource

     * @param string $type     The resource type

     *

     * @return Boolean true if this class supports the given resource, false otherwise

     */

    public function supports($resource, $type = null)

    {

        return is_string($resource) && 'yml' === pathinfo($resource, PATHINFO_EXTENSION);

    }

    /**

     * Parses all imports

     *

     * @param array $content

     * @param string $file

     * @return void

     */

    private function parseImports($content, $file)

    {

        if (!isset($content['imports'])) {

            return;

        }

        foreach ($content['imports'] as $import) {

            $this->setCurrentDir(dirname($file));

            $this->import($import['resource'], null, isset($import['ignore_errors']) ? (Boolean) $import['ignore_errors'] : false, $file);

        }

    }

    /**

     * Parses definitions

     *

     * @param array $content

     * @param string $file

     * @return void

     */

    private function parseDefinitions($content, $file)

    {

        if (!isset($content['services'])) {

            return;

        }

        foreach ($content['services'] as $id => $service) {

            $this->parseDefinition($id, $service, $file);

        }

    }

    /**

     * Parses a definition.

     *

     * @param string $id

     * @param array $service

     * @param string $file

     * @return void

     */

    private function parseDefinition($id, $service, $file)

    {

        if (is_string($service) && 0 === strpos($service, '@')) {

            $this->container->setAlias($id, substr($service, 1));

            return;

        } else if (isset($service['alias'])) {

            $public = !array_key_exists('public', $service) || (Boolean) $service['public'];

            $this->container->setAlias($id, new Alias($service['alias'], $public));

            return;

        }

        if (isset($service['parent'])) {

            $definition = new DefinitionDecorator($service['parent']);

        } else {

            $definition = new Definition();

        }

        if (isset($service['class'])) {

            $definition->setClass($service['class']);

        }

        if (isset($service['scope'])) {

            $definition->setScope($service['scope']);

        }

        if (isset($service['synthetic'])) {

            $definition->setSynthetic($service['synthetic']);

        }

        if (isset($service['public'])) {

            $definition->setPublic($service['public']);

        }

        if (isset($service['abstract'])) {

            $definition->setAbstract($service['abstract']);

        }

        if (isset($service['factory_class'])) {

            $definition->setFactoryClass($service['factory_class']);

        }

        if (isset($service['factory_method'])) {

            $definition->setFactoryMethod($service['factory_method']);

        }

        if (isset($service['factory_service'])) {

            $definition->setFactoryService($service['factory_service']);

        }

        if (isset($service['file'])) {

            $definition->setFile($service['file']);

        }

        if (isset($service['arguments'])) {

            $definition->setArguments($this->resolveServices($service['arguments']));

        }

        if (isset($service['properties'])) {

            $definition->setProperties($this->resolveServices($service['properties']));

        }

        if (isset($service['configurator'])) {

            if (is_string($service['configurator'])) {

                $definition->setConfigurator($service['configurator']);

            } else {

                $definition->setConfigurator(array($this->resolveServices($service['configurator'][0]), $service['configurator'][1]));

            }

        }

        if (isset($service['calls'])) {

            foreach ($service['calls'] as $call) {

                $definition->addMethodCall($call[0], $this->resolveServices($call[1]));

            }

        }

        if (isset($service['tags'])) {

            if (!is_array($service['tags'])) {

                throw new \InvalidArgumentException(sprintf('Parameter "tags" must be an array for service "%s" in %s.', $id, $file));

            }

            foreach ($service['tags'] as $tag) {

                if (!isset($tag['name'])) {

                    throw new \InvalidArgumentException(sprintf('A "tags" entry is missing a "name" key for service "%s" in %s.', $id, $file));

                }

                $name = $tag['name'];

                unset($tag['name']);

                $definition->addTag($name, $tag);

            }

        }

        $this->container->setDefinition($id, $definition);

    }

    /**

     * Loads a YAML file.

     *

     * @param string $file

     * @return array The file content

     */

    private function loadFile($file)

    {

        return $this->validate(Yaml::parse($file), $file);

    }

    /**

     * Validates a YAML file.

     *

     * @param mixed $content

     * @param string $file

     * @return array

     *

     * @throws \InvalidArgumentException When service file is not valid

     */

    private function validate($content, $file)

    {

        if (null === $content) {

            return $content;

        }

        if (!is_array($content)) {

            throw new \InvalidArgumentException(sprintf('The service file "%s" is not valid.', $file));

        }

        foreach (array_keys($content) as $namespace) {

            if (in_array($namespace, array('imports', 'parameters', 'services'))) {

                continue;

            }

            if (!$this->container->hasExtension($namespace)) {

                $extensionNamespaces = array_filter(array_map(function ($ext) { return $ext->getAlias(); }, $this->container->getExtensions()));

                throw new \InvalidArgumentException(sprintf(

                    'There is no extension able to load the configuration for "%s" (in %s). Looked for namespace "%s", found %s',

                    $namespace,

                    $file,

                    $namespace,

                    $extensionNamespaces ? sprintf('"%s"', implode('", "', $extensionNamespaces)) : 'none'

                ));

            }

        }

        return $content;

    }

    /**

     * Resolves services.

     *

     * @param string $value

     * @return Reference

     */

    private function resolveServices($value)

    {

        if (is_array($value)) {

            $value = array_map(array($this, 'resolveServices'), $value);

        } else if (is_string($value) &&  0 === strpos($value, '@')) {

            if (0 === strpos($value, '@?')) {

                $value = substr($value, 2);

                $invalidBehavior = ContainerInterface::IGNORE_ON_INVALID_REFERENCE;

            } else {

                $value = substr($value, 1);

                $invalidBehavior = ContainerInterface::EXCEPTION_ON_INVALID_REFERENCE;

            }

            if ('=' === substr($value, -1)) {

                $value = substr($value, 0, -1);

                $strict = false;

            } else {

                $strict = true;

            }

            $value = new Reference($value, $invalidBehavior, $strict);

        }

        return $value;

    }

    /**

     * Loads from Extensions

     *

     * @param array $content

     * @return void

     */

    private function loadFromExtensions($content)

    {

        foreach ($content as $namespace => $values) {

            if (in_array($namespace, array('imports', 'parameters', 'services'))) {

                continue;

            }

            if (!is_array($values)) {

                $values = array();

            }

            $this->container->loadFromExtension($namespace, $values);

        }

    }

}