<?php

/*
 * Copyright 2018 Google LLC
 * 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 name of Google Inc. nor the names of its
 * 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.
 */
namespace DeliciousBrains\WP_Offload_Media\Gcp\Google\ApiCore;

use DeliciousBrains\WP_Offload_Media\Gcp\Google\ApiCore\ResourceTemplate\AbsoluteResourceTemplate;
use DeliciousBrains\WP_Offload_Media\Gcp\Google\Protobuf\Internal\Message;
use DeliciousBrains\WP_Offload_Media\Gcp\GuzzleHttp\Psr7\Request;
use DeliciousBrains\WP_Offload_Media\Gcp\GuzzleHttp\Psr7\Utils;
use DeliciousBrains\WP_Offload_Media\Gcp\Psr\Http\Message\RequestInterface;
use DeliciousBrains\WP_Offload_Media\Gcp\Psr\Http\Message\UriInterface;
/**
 * Builds a PSR-7 request from a set of request information.
 *
 * @internal
 */
class RequestBuilder
{
    use ArrayTrait;
    use UriTrait;
    use ValidationTrait;
    private $baseUri;
    private $restConfig;
    /**
     * @param string $baseUri
     * @param string $restConfigPath
     * @throws ValidationException
     */
    public function __construct(string $baseUri, string $restConfigPath)
    {
        self::validateFileExists($restConfigPath);
        $this->baseUri = $baseUri;
        $this->restConfig = (require $restConfigPath);
    }
    /**
     * @param string $path
     * @return bool
     */
    public function pathExists(string $path)
    {
        list($interface, $method) = \explode('/', $path);
        return isset($this->restConfig['interfaces'][$interface][$method]);
    }
    /**
     * @param string $path
     * @param Message $message
     * @param array $headers
     * @return RequestInterface
     * @throws ValidationException
     */
    public function build(string $path, Message $message, array $headers = [])
    {
        list($interface, $method) = \explode('/', $path);
        if (!isset($this->restConfig['interfaces'][$interface][$method])) {
            throw new ValidationException("Failed to build request, as the provided path ({$path}) was not found in the configuration.");
        }
        $numericEnums = isset($this->restConfig['numericEnums']) && $this->restConfig['numericEnums'];
        $methodConfig = $this->restConfig['interfaces'][$interface][$method] + ['placeholders' => [], 'body' => null, 'additionalBindings' => null];
        $bindings = $this->buildBindings($methodConfig['placeholders'], $message);
        $uriTemplateConfigs = $this->getConfigsForUriTemplates($methodConfig);
        foreach ($uriTemplateConfigs as $config) {
            $pathTemplate = $this->tryRenderPathTemplate($config['uriTemplate'], $bindings);
            if ($pathTemplate) {
                // We found a valid uriTemplate - now build and return the Request
                list($body, $queryParams) = $this->constructBodyAndQueryParameters($message, $config);
                // Request enum fields will be encoded as numbers rather than strings  (in the response).
                if ($numericEnums) {
                    $queryParams['$alt'] = "json;enum-encoding=int";
                }
                $uri = $this->buildUri($pathTemplate, $queryParams);
                return new Request($config['method'], $uri, ['Content-Type' => 'application/json'] + $headers, $body);
            }
        }
        // No valid uriTemplate found - construct an exception
        $uriTemplates = [];
        foreach ($uriTemplateConfigs as $config) {
            $uriTemplates[] = $config['uriTemplate'];
        }
        throw new ValidationException("Could not map bindings for {$path} to any Uri template.\n" . "Bindings: " . \print_r($bindings, \true) . "UriTemplates: " . \print_r($uriTemplates, \true));
    }
    /**
     * Create a list of all possible configs using the additionalBindings
     *
     * @param array $config
     * @return array[] An array of configs
     */
    private function getConfigsForUriTemplates(array $config)
    {
        $configs = [$config];
        if ($config['additionalBindings']) {
            foreach ($config['additionalBindings'] as $additionalBinding) {
                $configs[] = $additionalBinding + $config;
            }
        }
        return $configs;
    }
    /**
     * @param Message $message
     * @param array $config
     * @return array Tuple [$body, $queryParams]
     */
    private function constructBodyAndQueryParameters(Message $message, array $config)
    {
        $messageDataJson = $message->serializeToJsonString();
        if ($config['body'] === '*') {
            return [$messageDataJson, []];
        }
        $body = null;
        $queryParams = [];
        $messageData = \json_decode($messageDataJson, \true);
        foreach ($messageData as $name => $value) {
            if (\array_key_exists($name, $config['placeholders'])) {
                continue;
            }
            if (Serializer::toSnakeCase($name) === $config['body']) {
                if (($bodyMessage = $message->{"get{$name}"}()) instanceof Message) {
                    $body = $bodyMessage->serializeToJsonString();
                } else {
                    $body = \json_encode($value);
                }
                continue;
            }
            if (\is_array($value) && $this->isAssoc($value)) {
                foreach ($value as $key => $value2) {
                    $queryParams[$name . '.' . $key] = $value2;
                }
            } else {
                $queryParams[$name] = $value;
            }
        }
        // Ensures required query params with default values are always sent
        // over the wire.
        if (isset($config['queryParams'])) {
            foreach ($config['queryParams'] as $requiredQueryParam) {
                $requiredQueryParam = Serializer::toCamelCase($requiredQueryParam);
                if (!\array_key_exists($requiredQueryParam, $queryParams)) {
                    $getter = Serializer::getGetter($requiredQueryParam);
                    $queryParamValue = $message->{$getter}();
                    if ($queryParamValue instanceof Message) {
                        // Decode message for the query parameter.
                        $queryParamValue = \json_decode($queryParamValue->serializeToJsonString(), \true);
                    }
                    if (\is_array($queryParamValue)) {
                        // If the message has properties, add them as nested querystring values.
                        // NOTE: This only supports nesting at one level of depth.
                        foreach ($queryParamValue as $key => $value) {
                            $queryParams[$requiredQueryParam . '.' . $key] = $value;
                        }
                    } else {
                        $queryParams[$requiredQueryParam] = $queryParamValue;
                    }
                }
            }
        }
        return [$body, $queryParams];
    }
    /**
     * @param array $placeholders
     * @param Message $message
     * @return array Bindings from path template fields to values from message
     */
    private function buildBindings(array $placeholders, Message $message)
    {
        $bindings = [];
        foreach ($placeholders as $placeholder => $metadata) {
            $value = \array_reduce($metadata['getters'], function (Message $result = null, $getter) {
                if ($result) {
                    return $result->{$getter}();
                }
            }, $message);
            $bindings[$placeholder] = $value;
        }
        return $bindings;
    }
    /**
     * Try to render the resource name. The rendered resource name will always contain a leading '/'
     *
     * @param string $uriTemplate
     * @param array $bindings
     * @return null|string
     * @throws ValidationException
     */
    private function tryRenderPathTemplate(string $uriTemplate, array $bindings)
    {
        $template = new AbsoluteResourceTemplate($uriTemplate);
        try {
            return $template->render($bindings);
        } catch (ValidationException $e) {
            return null;
        }
    }
    /**
     * @param string $path
     * @param array $queryParams
     * @return UriInterface
     */
    private function buildUri(string $path, array $queryParams)
    {
        $uri = Utils::uriFor(\sprintf('https://%s%s', $this->baseUri, $path));
        if ($queryParams) {
            $uri = $this->buildUriWithQuery($uri, $queryParams);
        }
        return $uri;
    }
}
