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<?php

/*
 * This file is part of JSON-API.
 *
 * (c) Toby Zerner <toby.zerner@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Tobscure\JsonApi;

class Resource implements ElementInterface
{
    use LinksTrait;
    use MetaTrait;

/**
     * @var mixed
     */
    protected $data;

/**
     * @var \Tobscure\JsonApi\SerializerInterface
     */
    protected $serializer;

/**
     * A list of relationships to include.
     *
     * @var array
     */
    protected $includes = [];

/**
     * A list of fields to restrict to.
     *
     * @var array|null
     */
    protected $fields;

/**
     * An array of Resources that should be merged into this one.
     *
     * @var \Tobscure\JsonApi\Resource[]
     */
    protected $merged = [];

/**
     * @var \Tobscure\JsonApi\Relationship[]
     */
    private $relationships;

/**
     * @param mixed $data
     * @param \Tobscure\JsonApi\SerializerInterface $serializer
     */
    public function __construct($data, SerializerInterface $serializer)
    {
        $this->data = $data;
        $this->serializer = $serializer;
    }

/**
     * {@inheritdoc}
     */
    public function getResources()
    {
        return [$this];
    }

/**
     * {@inheritdoc}
     */
    public function toArray()
    {
        $array = $this->toIdentifier();

if (! $this->isIdentifier()) {
            $attributes = $this->getAttributes();
            if ($attributes) {
                $array['attributes'] = $attributes;
            }
        }

$relationships = $this->getRelationshipsAsArray();

if (count($relationships)) {
            $array['relationships'] = $relationships;
        }

$links = [];
        if (! empty($this->links)) {
            $links = $this->links;
        }
        $serializerLinks = $this->serializer->getLinks($this->data);
        if (! empty($serializerLinks)) {
            $links = array_merge($serializerLinks, $links);
        }
        if (! empty($links)) {
            $array['links'] = $links;
        }

$meta = [];
        if (! empty($this->meta)) {
            $meta = $this->meta;
        }
        $serializerMeta = $this->serializer->getMeta($this->data);
        if (! empty($serializerMeta)) {
            $meta = array_merge($serializerMeta, $meta);
        }
        if (! empty($meta)) {
            $array['meta'] = $meta;
        }

return $array;
    }

/**
     * Check whether or not this resource is an identifier (i.e. does it have
     * any data attached?).
     *
     * @return bool
     */
    public function isIdentifier()
    {
        return ! is_object($this->data) && ! is_array($this->data);
    }

/**
     * {@inheritdoc}
     */
    public function toIdentifier()
    {
        if (! $this->data) {
            return;
        }

$array = [
            'type' => $this->getType(),
            'id' => $this->getId()
        ];

if (! empty($this->meta)) {
            $array['meta'] = $this->meta;
        }

return $array;
    }

/**
     * Get the resource type.
     *
     * @return string
     */
    public function getType()
    {
        return $this->serializer->getType($this->data);
    }

/**
     * Get the resource ID.
     *
     * @return string
     */
    public function getId()
    {
        if (! is_object($this->data) && ! is_array($this->data)) {
            return (string) $this->data;
        }

return (string) $this->serializer->getId($this->data);
    }

/**
     * Get the resource attributes.
     *
     * @return array
     */
    public function getAttributes()
    {
        $attributes = (array) $this->serializer->getAttributes($this->data, $this->getOwnFields());

$attributes = $this->filterFields($attributes);

$attributes = $this->mergeAttributes($attributes);

return $attributes;
    }

/**
     * Get the requested fields for this resource type.
     *
     * @return array|null
     */
    protected function getOwnFields()
    {
        $type = $this->getType();

if (isset($this->fields[$type])) {
            return $this->fields[$type];
        }
    }

/**
     * Filter the given fields array (attributes or relationships) according
     * to the requested fieldset.
     *
     * @param array $fields
     *
     * @return array
     */
    protected function filterFields(array $fields)
    {
        if ($requested = $this->getOwnFields()) {
            $fields = array_intersect_key($fields, array_flip($requested));
        }

return $fields;
    }

/**
     * Merge the attributes of merged resources into an array of attributes.
     *
     * @param array $attributes
     *
     * @return array
     */
    protected function mergeAttributes(array $attributes)
    {
        foreach ($this->merged as $resource) {
            $attributes = array_replace_recursive($attributes, $resource->getAttributes());
        }

return $attributes;
    }

/**
     * Get the resource relationships.
     *
     * @return \Tobscure\JsonApi\Relationship[]
     */
    public function getRelationships()
    {
        $relationships = $this->buildRelationships();

return $this->filterFields($relationships);
    }

/**
     * Get the resource relationships without considering requested ones.
     *
     * @return \Tobscure\JsonApi\Relationship[]
     */
    public function getUnfilteredRelationships()
    {
        return $this->buildRelationships();
    }

/**
     * Get the resource relationships as an array.
     *
     * @return array
     */
    public function getRelationshipsAsArray()
    {
        $relationships = $this->getRelationships();

$relationships = $this->convertRelationshipsToArray($relationships);

return $this->mergeRelationships($relationships);
    }

/**
     * Get an array of built relationships.
     *
     * @return \Tobscure\JsonApi\Relationship[]
     */
    protected function buildRelationships()
    {
        if (isset($this->relationships)) {
            return $this->relationships;
        }

$paths = Util::parseRelationshipPaths($this->includes);

$relationships = [];

foreach ($paths as $name => $nested) {
            $relationship = $this->serializer->getRelationship($this->data, $name);

if ($relationship) {
                $relationshipData = $relationship->getData();
                if ($relationshipData instanceof ElementInterface) {
                    $relationshipData->with($nested)->fields($this->fields);
                }

$relationships[$name] = $relationship;
            }
        }

return $this->relationships = $relationships;
    }

/**
     * Merge the relationships of merged resources into an array of
     * relationships.
     *
     * @param array $relationships
     *
     * @return array
     */
    protected function mergeRelationships(array $relationships)
    {
        foreach ($this->merged as $resource) {
            $relationships = array_replace_recursive($relationships, $resource->getRelationshipsAsArray());
        }

return $relationships;
    }

/**
     * Convert the given array of Relationship objects into an array.
     *
     * @param \Tobscure\JsonApi\Relationship[] $relationships
     *
     * @return array
     */
    protected function convertRelationshipsToArray(array $relationships)
    {
        return array_map(function (Relationship $relationship) {
            return $relationship->toArray();
        }, $relationships);
    }

/**
     * Merge a resource into this one.
     *
     * @param \Tobscure\JsonApi\Resource $resource
     *
     * @return void
     */
    public function merge(Resource $resource)
    {
        $this->merged[] = $resource;
    }

/**
     * {@inheritdoc}
     */
    public function with($relationships)
    {
        $this->includes = array_unique(array_merge($this->includes, (array) $relationships));

$this->relationships = null;

return $this;
    }

/**
     * {@inheritdoc}
     */
    public function fields($fields)
    {
        $this->fields = $fields;

return $this;
    }

/**
     * @return mixed
     */
    public function getData()
    {
        return $this->data;
    }

/**
     * @param mixed $data
     *
     * @return void
     */
    public function setData($data)
    {
        $this->data = $data;
    }

/**
     * @return \Tobscure\JsonApi\SerializerInterface
     */
    public function getSerializer()
    {
        return $this->serializer;
    }

/**
     * @param \Tobscure\JsonApi\SerializerInterface $serializer
     *
     * @return void
     */
    public function setSerializer(SerializerInterface $serializer)
    {
        $this->serializer = $serializer;
    }
}