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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;

use cebe\openapi\exceptions\IOException;
use cebe\openapi\exceptions\TypeErrorException;
use cebe\openapi\exceptions\UnresolvableReferenceException;
use cebe\openapi\json\InvalidJsonPointerSyntaxException;
use cebe\openapi\json\JsonPointer;
use cebe\openapi\spec\OpenApi;
use Symfony\Component\Yaml\Yaml;

/**
 * Utility class to simplify reading JSON or YAML OpenAPI specs.
 *
 */
class Reader
{
    /**
     * Populate OpenAPI spec object from JSON data.
     * @phpstan-template T of SpecObjectInterface
     * @phpstan-param class-string<T> $baseType
     * @phpstan-return T
     * @param string $json the JSON string to decode.
     * @param string $baseType the base Type to instantiate. This must be an instance of [[SpecObjectInterface]].
     * The default is [[OpenApi]] which is the base type of a OpenAPI specification file.
     * You may choose a different type if you instantiate objects from sub sections of a specification.
     * @return SpecObjectInterface|OpenApi the OpenApi object instance.
     * The type of the returned object depends on the `$baseType` argument.
     * @throws TypeErrorException in case invalid spec data is supplied.
     */
    public static function readFromJson(string $json, string $baseType = OpenApi::class): SpecObjectInterface
    {
        return new $baseType(json_decode($json, true));
    }

/**
     * Populate OpenAPI spec object from YAML data.
     * @phpstan-template T of SpecObjectInterface
     * @phpstan-param class-string<T> $baseType
     * @phpstan-return T
     * @param string $yaml the YAML string to decode.
     * @param string $baseType the base Type to instantiate. This must be an instance of [[SpecObjectInterface]].
     * The default is [[OpenApi]] which is the base type of a OpenAPI specification file.
     * You may choose a different type if you instantiate objects from sub sections of a specification.
     * @return SpecObjectInterface|OpenApi the OpenApi object instance.
     * The type of the returned object depends on the `$baseType` argument.
     * @throws TypeErrorException in case invalid spec data is supplied.
     */
    public static function readFromYaml(string $yaml, string $baseType = OpenApi::class): SpecObjectInterface
    {
        return new $baseType(Yaml::parse($yaml));
    }

/**
     * Populate OpenAPI spec object from a JSON file.
     * @phpstan-template T of SpecObjectInterface
     * @phpstan-param class-string<T> $baseType
     * @phpstan-return T
     * @param string $fileName the file name of the file to be read.
     * If `$resolveReferences` is true (the default), this should be an absolute URL, a `file://` URI or
     * an absolute path to allow resolving relative path references.
     * @param string $baseType the base Type to instantiate. This must be an instance of [[SpecObjectInterface]].
     * The default is [[OpenApi]] which is the base type of a OpenAPI specification file.
     * You may choose a different type if you instantiate objects from sub sections of a specification.
     * @param bool|string $resolveReferences whether to automatically resolve references in the specification.
     * If `true`, all [[Reference]] objects will be replaced with their referenced spec objects by calling
     * [[SpecObjectInterface::resolveReferences()]].
     * Since version 1.5.0 this can be a string indicating the reference resolving mode:
     * - `inline` only resolve references to external files.
     * - `all` resolve all references except recursive references.
     * @return SpecObjectInterface|OpenApi the OpenApi object instance.
     * The type of the returned object depends on the `$baseType` argument.
     * @throws TypeErrorException in case invalid spec data is supplied.
     * @throws UnresolvableReferenceException in case references could not be resolved.
     * @throws IOException when the file is not readable.
     * @throws InvalidJsonPointerSyntaxException in case an invalid JSON pointer string is passed to the spec references.
     */
    public static function readFromJsonFile(string $fileName, string $baseType = OpenApi::class, $resolveReferences = true): SpecObjectInterface
    {
        $fileContent = file_get_contents($fileName);
        if ($fileContent === false) {
            $e = new IOException("Failed to read file: '$fileName'");
            $e->fileName = $fileName;
            throw $e;
        }
        $spec = static::readFromJson($fileContent, $baseType);
        $context = new ReferenceContext($spec, $fileName);
        $spec->setReferenceContext($context);
        if ($resolveReferences !== false) {
            if (is_string($resolveReferences)) {
                $context->mode = $resolveReferences;
            }
            if ($spec instanceof DocumentContextInterface) {
                $spec->setDocumentContext($spec, new JsonPointer(''));
            }
            $spec->resolveReferences();
        }
        return $spec;
    }

/**
     * Populate OpenAPI spec object from YAML file.
     * @phpstan-template T of SpecObjectInterface
     * @phpstan-param class-string<T> $baseType
     * @phpstan-return T
     * @param string $fileName the file name of the file to be read.
     * If `$resolveReferences` is true (the default), this should be an absolute URL, a `file://` URI or
     * an absolute path to allow resolving relative path references.
     * @param string $baseType the base Type to instantiate. This must be an instance of [[SpecObjectInterface]].
     * The default is [[OpenApi]] which is the base type of a OpenAPI specification file.
     * You may choose a different type if you instantiate objects from sub sections of a specification.
     * @param bool|string $resolveReferences whether to automatically resolve references in the specification.
     * If `true`, all [[Reference]] objects will be replaced with their referenced spec objects by calling
     * [[SpecObjectInterface::resolveReferences()]].
     * Since version 1.5.0 this can be a string indicating the reference resolving mode:
     * - `inline` only resolve references to external files.
     * - `all` resolve all references except recursive references.
     * @return SpecObjectInterface|OpenApi the OpenApi object instance.
     * The type of the returned object depends on the `$baseType` argument.
     * @throws TypeErrorException in case invalid spec data is supplied.
     * @throws UnresolvableReferenceException in case references could not be resolved.
     * @throws IOException when the file is not readable.
     */
    public static function readFromYamlFile(string $fileName, string $baseType = OpenApi::class, $resolveReferences = true): SpecObjectInterface
    {
        $fileContent = file_get_contents($fileName);
        if ($fileContent === false) {
            $e = new IOException("Failed to read file: '$fileName'");
            $e->fileName = $fileName;
            throw $e;
        }
        $spec = static::readFromYaml($fileContent, $baseType);
        $context = new ReferenceContext($spec, $fileName);
        $spec->setReferenceContext($context);
        if ($resolveReferences !== false) {
            if (is_string($resolveReferences)) {
                $context->mode = $resolveReferences;
            }
            if ($spec instanceof DocumentContextInterface) {
                $spec->setDocumentContext($spec, new JsonPointer(''));
            }
            $spec->resolveReferences();
        }
        return $spec;
    }
}