<?php

namespace Catalyst\APIBundle\Connector;

use DateTime;

class Client
{
    const HEADER_API_KEY        = 'X-Cata-API-Key';
    const HEADER_SIGNATURE      = 'X-Cata-Signature';
    const HEADER_DATE           = 'X-Cata-Date';

    const DATE_FORMAT           = 'D, d M Y H:i:s T';

    const USER_AGENT            = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36';

    protected $protocol;
    protected $server;
    protected $port;
    protected $api_key;
    protected $secret_key;

    protected $curl;

    public function __construct($server, $api_key, $secret_key)
    {
        $this->protocol = 'https';
        $this->port = null;

        $this->server = $server;
        $this->api_key = $api_key;
        $this->secret_key = $secret_key;
        $this->curl = curl_init();
    }

    public function __destruct()
    {
        curl_close($this->curl);
    }

    public function setProtocol($protocol)
    {
        if ($protocol != 'http' && $protocol != 'https')
            return $this;

        $this->protocol = $protocol;
        return $this;
    }

    public function get($url, $params = [])
    {
        $date = new DateTime();
        $date_string = $date->format(self::DATE_FORMAT);

        $headers = $this->generateHeaders('GET', $url, $date_string);

        // build url
        if ($this->port == null)
            $full_url = $this->protocol . '://' . $this->server . $url;
        else
            $full_url = $this->protocol . '://' . $this->server . ':' . $this->port . $url;

        error_log($full_url);

        // curl
        curl_setopt($this->curl, CURLOPT_VERBOSE, true);
        curl_setopt($this->curl, CURLOPT_URL, $full_url);
        curl_setopt($this->curl, CURLOPT_HTTPHEADER, $headers);
        curl_setopt($this->curl, CURLOPT_USERAGENT, self::USER_AGENT);
        curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($this->curl, CURLOPT_TIMEOUT, 0);

        $res = curl_exec($this->curl);
        error_log($res);
    }

    public function post($params)
    {
    }

    protected function generateSignature($method, $url, $date_string)
    {
        $creds = [
            $method,
            $url,
            $date_string,
            $this->secret_key,
        ];
        $sig_source = implode('|', $creds);

        $raw_sig = hash_hmac('sha1', $sig_source, $this->secret_key, true);
        $enc_sig = base64_encode($raw_sig);

        return $enc_sig;
    }

    protected function generateHeaders($method, $url, $date_string)
    {
        $sig = $this->generateSignature($method, $url, $date_string);

        $headers = [
			self::HEADER_API_KEY . ': ' . $this->api_key,
            self::HEADER_SIGNATURE . ': ' . $sig,
            self::HEADER_DATE . ': ' . $date_string,
        ];

        return $headers;
    }
}