<?php
/**
 * Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
 *
 * You are hereby granted a non-exclusive, worldwide, royalty-free license to
 * use, copy, modify, and distribute this software in source code or binary
 * form for use in connection with the web services and APIs provided by
 * Facebook.
 *
 * As with any software that integrates with the Facebook platform, your use
 * of this software is subject to the Facebook Developer Principles and
 * Policies [http://developers.facebook.com/policy/]. This copyright notice
 * shall be included in all copies or substantial portions of the software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 */

namespace FacebookAds\Http;

use FacebookAds\Api;
use FacebookAds\Http\Adapter\AdapterInterface;
use FacebookAds\Http\Adapter\CurlAdapter;
use FacebookAds\Http\Exception\EmptyResponseException;
use FacebookAds\Http\Exception\RequestException;

class Client {

  /**
   * @var string
   */
  const DEFAULT_GRAPH_BASE_DOMAIN = 'facebook.com';

  /**
   * @var string
   */
  const DEFAULT_LAST_LEVEL_DOMAIN = 'graph';

  /**
   * @var RequestInterface
   */
  protected $requestPrototype;

  /**
   * @var ResponseInterface
   */
  protected $responsePrototype;

  /**
   * @var Headers
   */
  protected $defaultRequestHeaders;

  /**
   * @var AdapterInterface
   */
  protected $adapter;

  /**
   * @var string
   */
  protected $caBundlePath;

  /**
   * @var string
   */
  protected $defaultGraphBaseDomain = self::DEFAULT_GRAPH_BASE_DOMAIN;

  /**
   * @return RequestInterface
   */
  public function getRequestPrototype() {
    if ($this->requestPrototype === null) {
      $this->requestPrototype = new Request($this);
    }

    return $this->requestPrototype;
  }

  /**
   * @param RequestInterface $prototype
   */
  public function setRequestPrototype(RequestInterface $prototype) {
    $this->requestPrototype = $prototype;
  }

  /**
   * @return RequestInterface
   */
  public function createRequest() {
    return $this->getRequestPrototype()->createClone();
  }

  /**
   * @return ResponseInterface
   */
  public function getResponsePrototype() {
    if ($this->responsePrototype === null) {
      $this->responsePrototype = new Response();
    }

    return $this->responsePrototype;
  }

  /**
   * @param ResponseInterface $prototype
   */
  public function setResponsePrototype(ResponseInterface $prototype) {
    $this->responsePrototype = $prototype;
  }

  /**
   * @return ResponseInterface
   */
  public function createResponse() {
    return clone $this->getResponsePrototype();
  }

  /**
   * @return Headers
   */
  public function getDefaultRequestHeaderds() {
    if ($this->defaultRequestHeaders === null) {
      $this->defaultRequestHeaders = new Headers(array(
        'User-Agent' => 'fbbizsdk-php-v'.Api::VERSION,
        'Accept-Encoding' => '*',
      ));
    }

    return $this->defaultRequestHeaders;
  }

  /**
   * @param Headers $headers
   */
  public function setDefaultRequestHeaders(Headers $headers) {
    $this->defaultRequestHeaders = $headers;
  }

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

  /**
   * @param string $domain
   */
  public function setDefaultGraphBaseDomain($domain) {
    $this->defaultGraphBaseDomain = $domain;
  }

  /**
   * @return AdapterInterface
   */
  public function getAdapter() {
    if ($this->adapter === null) {
      $this->adapter = new CurlAdapter($this);
    }

    return $this->adapter;
  }

  /**
   * @param AdapterInterface $adapter
   */
  public function setAdapter(AdapterInterface $adapter) {
    $this->adapter = $adapter;
  }

  /**
   * @return string
   */
  public function getCaBundlePath() {
    if ($this->caBundlePath === null) {
      $this->caBundlePath = __DIR__.DIRECTORY_SEPARATOR
        .str_repeat('..'.DIRECTORY_SEPARATOR, 3)
        .'fb_ca_chain_bundle.crt';
    }

    return $this->caBundlePath;
  }

  /**
   * @param string $path
   */
  public function setCaBundlePath($path) {
    $this->caBundlePath = $path;
  }

  /**
   * @param RequestInterface $request
   * @return ResponseInterface
   * @throws RequestException
   */
  public function sendRequest(RequestInterface $request) {
    $response = $this->getAdapter()->sendRequest($request);
    $response->setRequest($request);
    $response_content = $response->getContent();

    if ($response_content === null) {
      throw new EmptyResponseException($response);
    }

    if (is_array($response_content)
      && array_key_exists('error', $response_content)) {

      throw RequestException::create($response);
    }

    return $response;
  }
}
