<?php
/*
 * Copyright (C) 2018 Champs Libres Cooperative <info@champs-libres.coop>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
namespace Chill\MainBundle\Phonenumber;

use GuzzleHttp\Client;
use GuzzleHttp\Exception\ClientException;
use GuzzleHttp\Exception\ServerException;
use GuzzleHttp\Exception\ConnectException;
use Psr\Log\LoggerInterface;
use Psr\Cache\CacheItemPoolInterface;

/**
 * Helper to some task linked to phonenumber.
 * 
 * Currently, only Twilio is supported (https://www.twilio.com/lookup). A method 
 * allow to check if the helper is configured for validation. This should be used
 * before doing some validation.
 *  
 *
 */
class PhonenumberHelper
{
    /**
     *
     * @var Client 
     */
    protected $twilioClient;
    
    /**
     *
     * @var LoggerInterface
     */
    protected $logger;
    
    /**
     *
     * @var CacheItemPoolInterface
     */
    protected $cachePool;
    
    const LOOKUP_URI = 'https://lookups.twilio.com/v1/PhoneNumbers/%s';
    const FORMAT_URI = 'https://lookups.twilio.com/v1/PhoneNumbers/%s';
    
    
    public function __construct(
        CacheItemPoolInterface $cachePool,
        $config, 
        LoggerInterface $logger
    ) {
        $this->logger = $logger;
        $this->cachePool = $cachePool;
        
        if (\array_key_exists('twilio_sid', $config) 
            && !empty($config['twilio_sid'])
            && \array_key_exists('twilio_secret', $config) 
            && !empty($config['twilio_secret'])) {
            
            $this->twilioClient = new Client([
                'auth' => [ $config['twilio_sid'], $config['twilio_secret'] ]
            ]);
        } 

    }
    
    /**
     * Return true if the validation is configured and available.
     * 
     * @return bool
     */
    public function isPhonenumberValidationConfigured() : bool
    {
        return NULL !== $this->twilioClient;
    }
    
    /**
     * REturn true if the phoennumber is a mobile phone. Return always false 
     * if the validation is not configured.
     * 
     * @param string $phonenumber
     * @return bool
     */
    public function isValidPhonenumberMobile($phonenumber) : bool
    {
        $validation = $this->performTwilioLookup($phonenumber);
        
        if (NULL === $validation) {
            return false;
        }
        
        return $validation === 'mobile';
    }
    
    /**
     * Return true if the phonenumber is a landline or voip phone.  Return always false 
     * if the validation is not configured.
     * 
     * @param string $phonenumber
     * @return bool
     */
    public function isValidPhonenumberLandOrVoip($phonenumber) : bool
    {
        $validation = $this->performTwilioLookup($phonenumber);
        
        if (NULL === $validation) {
            return false;
        }
        
        return \in_array($validation, [ 'landline', 'voip' ]);
    }
    
    /**
     * Return true if the phonenumber is a landline or voip phone.  Return always false 
     * if the validation is not configured.
     * 
     * @param string $phonenumber
     * @return bool
     */
    public function isValidPhonenumberAny($phonenumber) : bool
    {
        $validation = $this->performTwilioLookup($phonenumber);
        
        if (NULL === $validation) {
            return false;
        }
        
        return \in_array($validation, [ 'landline', 'voip', 'mobile' ]);
    }
    
    public function format($phonenumber)
    {
        return $this->performTwilioFormat($phonenumber);
    }
    
    protected function performTwilioFormat($phonenumber)
    {
        if (FALSE === $this->isPhonenumberValidationConfigured()) {
            return $phonenumber;
        }
        
        // filter only number
        $filtered = \preg_replace("/[^0-9]/", "", $phonenumber);
        
        $item = $this->cachePool->getItem('pnum_format_nat_'.$filtered);
        
        if ($item->isHit()) {
            return $item->get();
        }
        
        try {
            $response = $this->twilioClient->get(sprintf(self::FORMAT_URI, '+'.$filtered), [
                'http_errors' => true,
            ]);
            
        } catch (ClientException $e)  {
            $this->logger->error("[phonenumber helper] Could not format number "
                . "due to client error", [
                "message" => $e->getResponseBodySummary($e->getResponse()),
                "status_code" => $e->getResponse()->getStatusCode(),
                "phonenumber" => $phonenumber
            ]);
            
            return $phonenumber;
        } catch (ServerException $e) {
            $this->logger->error("[phonenumber helper] Could not format number "
                . "due to server error", [
                "message" => $e->getResponseBodySummary($e->getResponse()),
                "status_code" => $e->getResponse()->getStatusCode(),
                "phonenumber" => $phonenumber
            ]);
            
            return null;
        } catch (ConnectException $e) {
            $this->logger->error("[phonenumber helper] Could not format number "
                . "due to connect error", [
                "message" => $e->getMessage(),
                "phonenumber" => $phonenumber
            ]);
            
            return null;
        }
        
        $format = \json_decode($response->getBody())->national_format;
        
        $item
            ->set($format)
            // expires after 3d
            ->expiresAfter(3600 * 24 * 3)
            ;
        
        $this->cachePool->save($item);
        
        return $format;
    }
    
    protected function performTwilioLookup($phonenumber)
    {
        if (FALSE === $this->isPhonenumberValidationConfigured()) {
            return null;
        }
        
        // filter only number
        $filtered = \preg_replace("/[^0-9]/", "", $phonenumber);
        
        $item = $this->cachePool->getItem('pnum_'.$filtered);
        
        if ($item->isHit()) {
            return $item->get();
        }
        
        try {
            $response = $this->twilioClient->get(sprintf(self::LOOKUP_URI, '+'.$filtered), [
                'http_errors' => true,
                'query' => [
                    'Type' => 'carrier'
                ]
            ]);
        } catch (ClientException $e)  {
            return 'invalid';
        } catch (ServerException $e) {
            $this->logger->error("[phonenumber helper] Could not perform validation "
                . "due to server error", [
                "message" => $e->getResponseBodySummary($e->getResponse()),
                "status_code" => $e->getResponse()->getStatusCode(),
                "phonenumber" => $phonenumber
            ]);
            
            return null;
        } catch (ConnectException $e) {
            $this->logger->error("[phonenumber helper] Could not format number "
                . "due to connect error", [
                "message" => $e->getMessage(),
                "phonenumber" => $phonenumber
            ]);
            
            return null;
        }
        
        $validation = \json_decode($response->getBody())->carrier->type;
        
        $item
            ->set($validation)
            // expires after 12h
            ->expiresAfter(3600 * 12)
            ;
        
        $this->cachePool->save($item);
        
        return $validation;
    }
}