<?php

namespace Guzzle\Service\Command\Factory;

use Guzzle\Service\Command\CommandInterface;
use Guzzle\Service\ClientInterface;

/**
 * Composite factory used by a client object to create command objects utilizing multiple factories
 */
class CompositeFactory implements \IteratorAggregate, \Countable, FactoryInterface {

    /** @var array Array of command factories */
    protected $factories;

    /**
     * Get the default chain to use with clients
     *
     * @param ClientInterface $client Client to base the chain on
     *
     * @return self
     */
    public static function getDefaultChain(ClientInterface $client) {
        $factories = array();
        if ($description = $client->getDescription()) {
            $factories[] = new ServiceDescriptionFactory($description);
        }
        $factories[] = new ConcreteClassFactory($client);

        return new self($factories);
    }

    /**
     * @param array $factories Array of command factories
     */
    public function __construct(array $factories = array()) {
        $this->factories = $factories;
    }

    /**
     * Add a command factory to the chain
     *
     * @param FactoryInterface        $factory Factory to add
     * @param string|FactoryInterface $before  Insert the new command factory before a command factory class or object
     *                                         matching a class name.
     * @return CompositeFactory
     */
    public function add(FactoryInterface $factory, $before = null) {
        $pos = null;

        if ($before) {
            foreach ($this->factories as $i => $f) {
                if ($before instanceof FactoryInterface) {
                    if ($f === $before) {
                        $pos = $i;
                        break;
                    }
                } elseif (is_string($before)) {
                    if ($f instanceof $before) {
                        $pos = $i;
                        break;
                    }
                }
            }
        }

        if ($pos === null) {
            $this->factories[] = $factory;
        } else {
            array_splice($this->factories, $i, 0, array($factory));
        }

        return $this;
    }

    /**
     * Check if the chain contains a specific command factory
     *
     * @param FactoryInterface|string $factory Factory to check
     *
     * @return bool
     */
    public function has($factory) {
        return (bool) $this->find($factory);
    }

    /**
     * Remove a specific command factory from the chain
     *
     * @param string|FactoryInterface $factory Factory to remove by name or instance
     *
     * @return CompositeFactory
     */
    public function remove($factory = null) {
        if (!($factory instanceof FactoryInterface)) {
            $factory = $this->find($factory);
        }

        $this->factories = array_values(array_filter($this->factories, function($f) use ($factory) {
                    return $f !== $factory;
                }));

        return $this;
    }

    /**
     * Get a command factory by class name
     *
     * @param string|FactoryInterface $factory Command factory class or instance
     *
     * @return null|FactoryInterface
     */
    public function find($factory) {
        foreach ($this->factories as $f) {
            if ($factory === $f || (is_string($factory) && $f instanceof $factory)) {
                return $f;
            }
        }
    }

    /**
     * Create a command using the associated command factories
     *
     * @param string $name Name of the command
     * @param array  $args Command arguments
     *
     * @return CommandInterface
     */
    public function factory($name, array $args = array()) {
        foreach ($this->factories as $factory) {
            $command = $factory->factory($name, $args);
            if ($command) {
                return $command;
            }
        }
    }

    public function count() {
        return count($this->factories);
    }

    public function getIterator() {
        return new \ArrayIterator($this->factories);
    }

}
