<?php
/**
 * Copyright (c) 2012-2013 Jurian Sluiman.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the names of the copyright holders nor the names of the
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * @author      Jurian Sluiman <jurian@juriansluiman.nl>
 * @copyright   2012-2013 Jurian Sluiman.
 * @license     http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @link        http://juriansluiman.nl
 */

namespace SlmLocale\Locale;

use Laminas\EventManager\EventManagerAwareInterface;
use Laminas\EventManager\EventManagerInterface;
use Laminas\Stdlib\RequestInterface;
use Laminas\Stdlib\ResponseInterface;
use Laminas\Uri\Uri;
use SlmLocale\LocaleEvent;
use SlmLocale\Strategy\StrategyInterface;

class Detector implements EventManagerAwareInterface
{
    /**
     * Event manager holding the different strategies
     *
     * @var EventManagerInterface
     */
    protected $events;

    /**
     * Default locale
     *
     * @var string
     */
    protected $default;

    /**
     * Optional list of supported locales
     *
     * @var array
     */
    protected $supported;

    /**
     * Optional list of locale mappings
     *
     * @var array
     */
    protected $mappings;

    public function getEventManager()
    {
        return $this->events;
    }

    public function setEventManager(EventManagerInterface $events)
    {
        $events->setIdentifiers([
            __CLASS__,
            get_called_class(),
        ]);
        $this->events = $events;

        return $this;
    }

    public function addStrategy(StrategyInterface $strategy, $priority = 1)
    {
        $strategy->attach($this->getEventManager(), $priority);
    }

    public function getDefault()
    {
        return $this->default;
    }

    public function setDefault($default)
    {
        $this->default = $default;

        return $this;
    }

    public function getSupported()
    {
        return $this->supported;
    }

    public function setSupported(array $supported)
    {
        $this->supported = $supported;

        return $this;
    }

    public function hasSupported()
    {
        return is_array($this->supported) && count($this->supported);
    }

    public function getMappings()
    {
        return $this->mappings;
    }

    public function setMappings(array $mappings)
    {
        $this->mappings = $mappings;

        return $this;
    }

    public function hasMappings()
    {
        return is_array($this->mappings) && count($this->mappings);
    }

    public function detect(RequestInterface $request, ResponseInterface $response = null)
    {
        $event = new LocaleEvent(LocaleEvent::EVENT_DETECT, $this);
        $event->setRequest($request);
        $event->setResponse($response);

        if ($this->hasSupported()) {
            $event->setSupported($this->getSupported());
        }

        $events  = $this->getEventManager();
        $results = $events->triggerEventUntil(function ($r) {
            return is_string($r);
        }, $event);

        if ($results->stopped()) {
            $locale = $results->last();
        } else {
            $locale = $this->getDefault();
        }

        if ($this->hasSupported() && ! in_array($locale, $this->getSupported())) {
            $locale = $this->getDefault();
        }

        if ($this->hasMappings() && array_key_exists($locale, $this->getMappings())) {
            $mappings = $this->getMappings();
            $locale   = $mappings[$locale];
        }

        // Trigger FOUND event only when a response is given
        if ($response instanceof ResponseInterface) {
            $event->setName(LocaleEvent::EVENT_FOUND);
            $event->setLocale($locale);

            $return = false;
            /**
             * The response will be returned instead of the found locale
             * only in case a strategy returned the response. This is an
             * indication the strategy has updated the response (e.g. with
             * a Location header) and as such, the response must be returned
             * instead of the locale.
             */
            $events->triggerEventUntil(function ($r) use (&$return) {
                if ($r instanceof ResponseInterface) {
                    $return = true;
                }
            }, $event);

            if ($return) {
                return $response;
            }
        }

        return $locale;
    }

    public function assemble($locale, $uri, RequestInterface $request)
    {
        $event = new LocaleEvent(LocaleEvent::EVENT_ASSEMBLE, $this);
        $event->setLocale($locale);
        $event->setRequest($request);

        if ($this->hasSupported()) {
            $event->setSupported($this->getSupported());
        }

        if (! $uri instanceof Uri) {
            $uri = new Uri($uri);
        }
        $event->setUri($uri);

        $events  = $this->getEventManager();
        $results = $events->triggerEvent($event);
        if (! $results->stopped()) {
            return $uri;
        }

        return $results->last();
    }
}