<?php

$config = json_decode(file_get_contents("./config.json"));

final class ApiRequest {

    const GET = 'GET';
    const POST = 'POST';
    const PUT = 'PUT';
}

class Api {

    private $_user;

    private $_password;

    private $_endpoint;

    private $_token = null;

    public function __construct($endpoint) {

        $this->_endpoint = $endpoint;
    }

    /**
     * @param        $url
     * @param array  $body
     * @param array  $params
     * @param string $type
     * @param null   $info
     *
     * @return string
     * @throws Exception
     */
    public function request($url, $body = [], $params = [], $type = ApiRequest::GET, &$info = null, $log = false) {

        $headers = [];

        if ($this->_token == null && !isset($body['auth'])) {
            $this->_token = $this->login([
                'user' => $this->_user,
                'password' => $this->_password
            ]);
        }

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $this->_endpoint . $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $type);
        curl_setopt($curl, CURLINFO_HEADER_OUT, 1);

        if ($this->_token != null) {
            $headers[] = 'X-Authorization-Token: ' . $this->_token;
        }

        if ($type == ApiRequest::POST) {

            curl_setopt($curl, CURLOPT_POST, 1);
            curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($params));

        } else {
            if ($type == ApiRequest::GET) {
                if(count($body) > 0) {
                    $dataString = json_encode($body);
                    foreach ([
                                 'Content-Type: application/json',
                                 'Content-Length: ' . strlen($dataString)
                             ] as $header) {
                        $headers[] = $header;
                    };
                    curl_setopt($curl, CURLOPT_POSTFIELDS, $dataString);
                }
            }
        }

        curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);

        $response = curl_exec($curl);
        $info = curl_getinfo($curl);
        curl_close($curl);

        if ($log) {
            $this->log($url, $response, $info, $info['request_header']);
        }

        if ($info["http_code"] != 200) {
            return null;
        }

        return json_decode($response);
    }

    private function log($text, $response = [], $info = [], $request = []) {

        echo $text . "\n";
        foreach ([
                     'Response' => $response,
                     'Info' => $info,
                     'Request' => $request
                 ] as $name => $param) {
            if (count($param) > 0) {
                echo $name . ":\n";
                var_dump($param);
                echo "\n\n";
            }
        }
        for ($i = 0; $i < 20; $i++) {
            echo "-";
        }
        echo "\n";
    }

    /**
     * @param $credentials
     *
     * @return string
     * @throws Exception
     */
    private function login($credentials) {

        //$this->log("Logging in...");
        $response = $this->request('/Core/REST/auth', ['auth' => $credentials], [], ApiRequest::GET, $info);
        $this->_token = $response->result->token;

        //$this->log("Logged in", $response, $info);
        return $this->_token;
    }

    /**
     * @param mixed $user
     */
    public function setUser($user) {

        $this->_user = $user;
    }

    /**
     * @param mixed $password
     */
    public function setPassword($password) {

        $this->_password = $password;
    }
}

$api = new Api("https://e-fellows-restdemo.starhunter.software");
$api->setUser($config->username);
$api->setPassword($config->password);
/*$api->login((object)[
    'user' => $config->username,
    'password' => $config->password
]);*/

$response = $api->request('/Core/REST/users?offset=0&limit=10?sort=creation_date ', [], [], ApiRequest::GET, $info, true);