<?php
    namespace adapters;
    use \Ovh\Api;

    /**
     * Interface for phones adapters
     * Phone's adapters allow RaspiSMS to use a platform to communicate with a phone number.
     * Its an adapter between internal and external code, as an API, command line software, physical modem, etc.
     *
     * All Phone Adapters must implement this interface
     */
    class OvhSmsAdapter implements AdapterInterface
    {
        /**
         * Classname of the adapter
         */
        public static function meta_classname() : string { return __CLASS__; }

        /**
         * Name of the adapter.
         * It should probably be the name of the service it adapt (e.g : Gammu SMSD, OVH SMS, SIM800L, etc.)
         */
        public static function meta_name() : string { return 'OVH SMS'; }

        /**
         * Description of the adapter.
         * A short description of the service the adapter implements.
         */
        public static function meta_description() : string { return 'Solution de SMS proposé par le groupe OVH, https://www.ovhtelecom.fr/sms/.'; }
        
        /**
         * Description of the datas expected by the adapter to help the user. (e.g : A list of expecteds Api credentials fields, with name and value)
         */
        public static function meta_datas_help() : string { return 'Clefs API OVH, https://api.ovh.com/createToken/index.cgi.'; } 
        
        /**
         * List of entries we want in datas for the adapter
         * @return array : Every line is a field as an array with keys : name, title, description, required
         */
        public static function meta_datas_fields() : array
        {
            return [
                [
                    'name' => 'app_key',
                    'title' => 'Application Key',
                    'description' => 'Paramètre "Application Key" obtenu lors de la génération de la clef API OVH.',
                    'required' => true,
                ],
                [
                    'name' => 'app_secret',
                    'title' => 'Application Secret',
                    'description' => 'Paramètre "Application Secret" obtenu lors de la génération de la clef API OVH.',
                    'required' => true,
                ],
                [
                    'name' => 'consumer_key',
                    'title' => 'Consumer Key',
                    'description' => 'Paramètre "Consumer Key" obtenu lors de la génération de la clef API OVH.',
                    'required' => true,
                ],
                [
                    'name' => 'endpoint',
                    'title' => 'Endpoint',
                    'description' => 'Endpoint de l\'API OVH, voir https://github.com/ovh/php-ovh/#supported-apis.',
                    'required' => true,
                ],
                [
                    'name' => 'service_name',
                    'title' => 'Service Name',
                    'description' => 'Service Name de votre service SMS chez OVH. Il s\'agit du nom associé à votre service SMS dans la console OVH, probablement quelque chose comme "sms-xxxxx-1" ou "xxxx" est votre identifiant client OVH.',
                    'required' => true,
                ],
            ];
        }

        /**
         * Does the implemented service support flash smss
         */
        public static function meta_support_flash() : bool { return false ; }
        
        /**
         * Does the implemented service support status change
         */
        public static function meta_support_status_change() : bool { return true; }


        /**
         * Phone number using the adapter
         */
        private $number;

        /**
         * Datas used to configure interaction with the implemented service. (e.g : Api credentials, ports numbers, etc.).
         */
        private $datas;

        /**
         * OVH Api instance
         */
        private $api;

        /**
         * Number formated to be compatible with http query according to the ovh way
         */
        private $formatted_number;
        
        /**
         * Adapter constructor, called when instanciated by RaspiSMS
         * @param string $number : Phone number the adapter is used for
         * @param json string $datas : JSON string of the datas to configure interaction with the implemented service
         */
        public function __construct (string $number, string $datas)
        {
            $this->number = $number;
            $this->formatted_number = str_replace('+', '00', $number);
            $this->datas = json_decode($datas, true);

            $this->api = new Api(
                $this->datas['app_key'],
                $this->datas['app_secret'],
                $this->datas['endpoint'],
                $this->datas['consumer_key']
            );
        }
    
    
        /**
         * Method called to send a SMS to a number
         * @param string $destination : Phone number to send the sms to
         * @param string $text : Text of the SMS to send
         * @param bool $flash : Is the SMS a Flash SMS
         * @return mixed Uid of the sended message if send, False else
         */
        public function send (string $destination, string $text, bool $flash = false)
        {
            try 
            {
                $success = true;

                $endpoint = '/sms/' . $this->datas['service_name'] . '/virtualNumbers/' . $this->formatted_number . '/jobs';
                $params = [
                    'message' => $text,
                    'receivers' => [$destination],
                ];

                $response = $this->api->post($endpoint, $params);

                $nb_invalid_receivers = count(($response['invalidReceivers'] ?? []));
                if ($nb_invalid_receivers > 0)
                {
                    return false;
                }

                $uids = $response['ids'] ?? [];
                return ($uids[0] ?? false);
            }
            catch (\Exception $e)
            {
                return false;
            }
        }


        /**
         * Method called to read SMSs of the number
         * @return array : Array of the sms reads
         */
        public function read () : array
        {
            try 
            {
                $success = true;

                $endpoint = '/sms/' . $this->datas['service_name'] . '/virtualNumbers/' . $this->formatted_number . '/incoming';
                $uids = $this->api->get($endpoint);

                if (!is_array($uids) || !$uids)
                {
                    return [];
                }

                $received_smss = [];
                foreach ($uids as $uid)
                {
                    $endpoint = '/sms/' . $this->datas['service_name'] . '/virtualNumbers/' . $this->formatted_number . '/incoming/' . $uid;
                    $sms_details = $this->api->get($endpoint);

                    if (!isset($sms_details['creationDatetime'], $sms_details['message'], $sms_details['sender']))
                    {
                        continue;
                    }

                    $received_smss[] = [
                        'at' => (new \DateTime($sms_details['creationDatetime']))->format('Y-m-d H:i:s'),
                        'text' => $sms_details['message'],
                        'origin' => $sms_details['sender'],
                        'destination' => $this->number,
                    ];

                    //Remove the sms to prevent double reading as ovh do not offer a filter for unread messages only
                    $endpoint = '/sms/' . $this->datas['service_name'] . '/virtualNumbers/' . $this->formatted_number . '/incoming/' . $uid;
                    $this->api->delete($endpoint);
                }

                return $received_smss;
            }
            catch (\Exception $e)
            {
                return [];
            }
        }


        /**
         * Method called to verify if the adapter is working correctly
         * should be use for exemple to verify that credentials and number are both valid
         * @return boolean : False on error, true else
         */
        public function test () : bool
        {
            try 
            {
                $success = true;

                //Check service name
                $endpoint = '/sms/' . $this->datas['service_name'];
                $response = $this->api->get($endpoint);
                $success = $success && (bool) $response;
                
                //Check virtualnumber
                $endpoint = '/sms/virtualNumbers/' . $this->formatted_number;
                $response = $this->api->get($endpoint);
                $success = $success && (bool) $response;

                return $success;
            }
            catch (\Exception $e)
            {
                return false;
            }
        }


        /**
         * Method called on reception of a status update notification for a SMS
         * @return mixed : False on error, else array ['uid' => uid of the sms, 'status' => New status of the sms ('unknown', 'delivered', 'failed')]
         */
        public static function status_change_callback ()
        {
            $uid = $_GET['id'] ?? false;
            $dlr = $_GET['dlr'] ?? false;

            if ($uid === false || $dlr === false)
            {
                return false;
            }

            switch ($dlr)
            {
                case 1:
                    $status = 'delivered';
                    break;

                case 2:
                case 16:
                    $status = 'failed';
                    break;
                
                default:
                    $status = 'unknown';
                    break;
            }

            return ['uid' => $uid, 'status' => $status];
        }
    }