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<?php

/**
 * @copyright Copyright (c) 2018 Carsten Brandt <mail@cebe.cc> and contributors
 * @license https://github.com/cebe/php-openapi/blob/master/LICENSE
 */

namespace cebe\openapi\spec;

use cebe\openapi\DocumentContextInterface;
use cebe\openapi\exceptions\TypeErrorException;
use cebe\openapi\exceptions\UnresolvableReferenceException;
use cebe\openapi\json\JsonPointer;
use cebe\openapi\ReferenceContext;
use cebe\openapi\SpecObjectInterface;

/**
 * A map of possible out-of band callbacks related to the parent operation.
 *
 * @link https://github.com/OAI/OpenAPI-Specification/blob/3.0.2/versions/3.0.2.md#callbackObject
 *
 */
class Callback implements SpecObjectInterface, DocumentContextInterface
{
    /**
     * @var string|null
     */
    private $_url;
    /**
     * @var PathItem
     */
    private $_pathItem;
    /**
     * @var array
     */
    private $_errors = [];
    /**
     * @var SpecObjectInterface|null
     */
    private $_baseDocument;
    /**
     * @var JsonPointer|null
     */
    private $_jsonPointer;


    /**
     * Create an object from spec data.
     * @param array $data spec data read from YAML or JSON
     * @throws TypeErrorException in case invalid data is supplied.
     */
    public function __construct(array $data)
    {
        if (count($data) !== 1) {
            $this->_errors[] = 'Callback object must have exactly one URL.';
            return;
        }
        $this->_pathItem = new PathItem(reset($data));
        $this->_url = key($data);
    }

    /**
     * @return mixed returns the serializable data of this object for converting it
     * to JSON or YAML.
     */
    public function getSerializableData()
    {
        return (object) [$this->_url => ($this->_pathItem === null) ? null : $this->_pathItem->getSerializableData()];
    }

    /**
     * @return string
     */
    public function getUrl()
    {
        return $this->_url;
    }

    /**
     * @param string $url
     */
    public function setUrl(string $url): void
    {
        $this->_url = $url;
    }

    /**
     * @return PathItem
     */
    public function getRequest(): ?PathItem
    {
        return $this->_pathItem;
    }

    /**
     * @param PathItem $request
     */
    public function setRequest(?PathItem $request): void
    {
        $this->_pathItem = $request;
    }

    /**
     * Validate object data according to OpenAPI spec.
     * @return bool whether the loaded data is valid according to OpenAPI spec
     * @see getErrors()
     */
    public function validate(): bool
    {
        $pathItemValid = $this->_pathItem === null || $this->_pathItem->validate();
        return $pathItemValid && empty($this->_errors);
    }

    /**
     * @return string[] list of validation errors according to OpenAPI spec.
     * @see validate()
     */
    public function getErrors(): array
    {
        if (($pos = $this->getDocumentPosition()) !== null) {
            $errors = array_map(function ($e) use ($pos) {
                return "[{$pos}] $e";
            }, $this->_errors);
        } else {
            $errors = $this->_errors;
        }

        $pathItemErrors = $this->_pathItem === null ? [] : $this->_pathItem->getErrors();
        return array_merge($errors, $pathItemErrors);
    }

    /**
     * Resolves all Reference Objects in this object and replaces them with their resolution.
     * @throws UnresolvableReferenceException
     */
    public function resolveReferences(ReferenceContext $context = null)
    {
        if ($this->_pathItem !== null) {
            $this->_pathItem->resolveReferences($context);
        }
    }

    /**
     * Set context for all Reference Objects in this object.
     */
    public function setReferenceContext(ReferenceContext $context)
    {
        if ($this->_pathItem !== null) {
            $this->_pathItem->setReferenceContext($context);
        }
    }

    /**
     * Provide context information to the object.
     *
     * Context information contains a reference to the base object where it is contained in
     * as well as a JSON pointer to its position.
     * @param SpecObjectInterface $baseDocument
     * @param JsonPointer $jsonPointer
     */
    public function setDocumentContext(SpecObjectInterface $baseDocument, JsonPointer $jsonPointer)
    {
        $this->_baseDocument = $baseDocument;
        $this->_jsonPointer = $jsonPointer;

        if ($this->_pathItem instanceof DocumentContextInterface) {
            $this->_pathItem->setDocumentContext($baseDocument, $jsonPointer->append($this->_url));
        }
    }

    /**
     * @return SpecObjectInterface|null returns the base document where this object is located in.
     * Returns `null` if no context information was provided by [[setDocumentContext]].
     */
    public function getBaseDocument(): ?SpecObjectInterface
    {
        return $this->_baseDocument;
    }

    /**
     * @return JsonPointer|null returns a JSON pointer describing the position of this object in the base document.
     * Returns `null` if no context information was provided by [[setDocumentContext]].
     */
    public function getDocumentPosition(): ?JsonPointer
    {
        return $this->_jsonPointer;
    }
}