<?php

/*
	Flexisip Account Manager is a set of tools to manage SIP accounts.
	Copyright (C) 2019 Belledonne Communications SARL, All rights reserved.

	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/>.
*/

// The following can't be put inside a function...
// So comment it out if not using the OVH SMS API
require __DIR__ . '/../vendor/autoload.php';
use \Ovh\Sms\SmsApi;

include_once __DIR__ . '/../database/database.php';
include_once __DIR__ . '/../objects/sms.php';
include_once __DIR__ . '/../misc/logging.php';
include_once __DIR__ . '/results_values.php';
include_once __DIR__ . '/utilities.php';

// Internationalization

function get_sms_string_for_lang($lang) {
	global $SMS_OVH_TEMPLATE;
	if (isset($SMS_OVH_TEMPLATE[$lang])) {
		return $SMS_OVH_TEMPLATE[$lang];
	}
	Logger::getInstance()->warning("SMS template not found for lang " . $lang . ", using US template");
	return SMS_OVH_US_TEMPLATE;
}

// SMS API

function send_sms_ovh($phone, $key, $lang) {
	if (!SMS_API_ENABLED) {
		Logger::getInstance()->warning("[SMS] SMS API disabled");
		return SMS_DISABLED;
	}

	$sms = new SmsApi(SMS_OVH_API_KEY, SMS_OVH_API_SECRET, SMS_OVH_ENDPOINT, SMS_OVH_CONSUMER_KEY);
	$accounts = $sms->getAccounts();
	$sms->setAccount($accounts[0]);
	if (SMS_USE_SENDER) {
		$senders = $sms->getSenders();

		/* The account must be validated in the OVH interface and by OVH itself */
		if (count($senders) == 0) {
			Logger::getInstance()->warning("[SMS] No sender found, creating one " . SMS_OVH_SENDER . " / " . SMS_OVH_REASON . " : " . SMS_OVH_DESC);
			$sms->addSender(SMS_OVH_SENDER, SMS_OVH_REASON, SMS_OVH_DESC);
			$senders = $sms->getSenders();
		}
	}

	$message = $sms->createMessage();
	if (SMS_USE_SENDER && count($senders) > 0) {
		foreach ($senders as $sender) {
			if ($sender == SMS_OVH_SENDER) {
				if ($sms->checkSender($sender)) {
					// Check if sender exists and is valid, otherwise it will create an exception and sms won't be sent
					Logger::getInstance()->message("[SMS] Found valid sender " . $sender . ", using it");
					$message->setSender($sender);
					break;
				} else {
					Logger::getInstance()->error("[SMS] Found sender " . $sender . " but it is not valid");
				}
			}
		}
	}
	$message->addReceiver($phone);
	$message->setIsMarketing(FALSE);

	$text = get_sms_string_for_lang($lang);
	$text = str_replace("#CODE#", $key, $text);
	$result = $message->send($text);

	$credits_removed = $result['totalCreditsRemoved'];
	Logger::getInstance()->message("[SMS] " . $credits_removed . " credit removed");
	$invalid_receiver = $result['invalidReceivers'];
	$valid_receiver = $result['validReceivers'];
	if (count($invalid_receiver) > 0) {
		Logger::getInstance()->error("[SMS] phone number " . $phone . " seems invalid");
	} else if (count($valid_receiver) > 0) {
		Logger::getInstance()->message("[SMS] " . $text . " sent to " . $phone);
	} else {
		Logger::getInstance()->warning("[SMS] Both valid and invalid receiver lists are empty...");
	}
}

function send_sms_legacy($phone, $password) {
	if (!SMS_API_ENABLED) {
		Logger::getInstance()->warning("[SMS] SMS API disabled");
		return SMS_DISABLED;
	}

	$url = SMS_API_URL;
	$ch = curl_init($url);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
	curl_setopt($ch, CURLOPT_FAILONERROR, false);
	curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
	curl_setopt($ch, CURLOPT_USERPWD, SMS_API_USERNAME . ":" . SMS_API_PASSWORD);
	curl_setopt($ch, CURLOPT_HTTPHEADER, array(
			'Content-Type: application/x-www-form-urlencoded'
	));
	curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array(
			'mobile' => $phone,
			'password' => $password,
	)));
	$result = curl_exec($ch);
	Logger::getInstance()->message("[SMS] SMS confirmation sent to " . $phone . " using password " . $password . ", request result is " . $result);
	curl_close($ch);
}

function send_sms($phone, $key, $lang) {
	if (!SMS_API_ENABLED) {
		Logger::getInstance()->warning("[SMS] SMS API disabled");
		return SMS_DISABLED;
	}

	if (startswith($phone, TESTS_PHONE_PREFIX)) {
		Logger::getInstance()->error("[SMS] Not sending sms to fake number used for tests purposes: " . $phone);
		return TEST_ACCOUNTS_DISABLED;
	}

	$now_date = new DateTime('now');
	$now = $now_date->getTimestamp() * 1000;

	$database = new Database();
	$db = $database->getConnection();
	$sms = new SMS($db);
	$sms->phone = $phone;

	if ($sms->getOne()) {
		$diff = $now - $sms->last_sms;
		if ($sms->count >= SMS_COUNT_LIMIT_IN_PERIOD and $diff < SMS_TIME_PERIOD) {
			Logger::getInstance()->error("[SMS] Last sms was sent at " . $sms->last_sms . ", time elapsed since then is " . $diff . "ms which is less than the configured time period " . SMS_TIME_PERIOD);
			return MAX_SMS_ALLOWED_EXCEEDED;
		} else if ($diff >= SMS_TIME_PERIOD) {
			$sms->last_sms = $now;
			$sms->count = 1;
			$sms->update();
		} else {
			$sms->count = $sms->count + 1;
			$sms->update();
		}
	} else {
		$sms->last_sms = $now;
		$sms->count = 1;
		$sms->create();
	}

	if (SMS_OVH_API_KEY != NULL && SMS_OVH_API_KEY != "" && SMS_OVH_API_SECRET != NULL && SMS_OVH_API_SECRET != "" && SMS_OVH_CONSUMER_KEY != NULL && SMS_OVH_CONSUMER_KEY != "" && SMS_OVH_ENDPOINT != NULL && SMS_OVH_ENDPOINT != "") {
		try {
			send_sms_ovh($phone, $key, $lang);
			return OK;
		} catch (Exception $e) {
			Logger::getInstance()->error("[OVH-SMS] Exception: " . $e->getMessage());
		}
	} else if (SMS_API_URL != NULL && SMS_API_URL != "" && SMS_API_USERNAME != NULL && SMS_API_USERNAME != "" && SMS_API_PASSWORD != NULL && SMS_API_PASSWORD != "") {
		send_sms_legacy($phone, $key);
		return OK;
	} else {
		Logger::getInstance()->error("[SMS] No SMS API configured, discarding sms...");
		return OK;
	}
	return SMS_API_FAILURE;
}

?>