<?php
namespace OCA\CTAutoMailHooks\Hooks;
use OCP\ILogger;
use OCP\IUserManager;
use OCA\CTAutoMailHooks\Config;
class UserHooks {
    private $logger;
    private $config;
    private $userManager;
    private $logContext = ['app' => 'ct_auto_mail_hooks'];
    public function __construct(
        ILogger $logger, Config $config, IUserManager $userManager) {
        $this->logger = $logger;
        $this->config = $config;
        $this->userManager = $userManager;
    }
    public function register() {
        $this->userManager->listen(
            '\OC\User', 'postCreateUser',$this->createUserCB());
        $this->userManager->listen(
            '\OC\User', 'preDelete', $this->deleteUserCB());
        $this->userManager->listen(
            '\OC\User', 'postSetPassword', $this->updateEmailPasswordCB());
    }
    private function createUserCB() {
        return function (\OC\User\User $user, string $password) {
            $uid = $user->getUID();
            $name = $user->getDisplayName();
            $email_suffix = $this->config->getEmailAddressSuffix();
            $quota = $this->config->getEmailQuotaMB();
            $newuser = array(
                'userid' => $uid,
                'password' => $password,
                'name' => $name,
                'email' => $uid . $email_suffix,
                'quota' => $quota // in MB
            );
            if($this->createEmailAccount($newuser)) {
                $this->logger->warning(
                    "Automatically created mail account for uid " . $uid
                    . " with e-mail address \"" . $newuser["email"]
                    . " e-mail address suffix was \"". $email_suffix . "\"."
                    , $this->logContext);
            }
            else {
                $this->logger->error(
                    "Error creating mail account OR mail folders for uid "
                    . $uid);
            }
        };
    }
    private function deleteUserCB() {
        return function (\OC\User\User $user) {
            $uid = $user->getUID();
            $email_suffix = $this->config->getEmailAddressSuffix();
            $email = $uid . $email_suffix;
            $user_data = array('email' => $email);
            if($this->deleteEmailAccount($user_data))
                $this->logger->warning(
                    "Deleted mail account: " .  $email, $this->logContext);
            else $this->logger->error("Error deleting mail account" . $uid);
        };
    }
    private function updateEmailPasswordCB() {
        return function (\OC\User\User $user, string $password) {
            $uid = $user->getUID();
            $email_suffix = $this->config->getEmailAddressSuffix();
            $email = $uid . $email_suffix;
            $user_data = array(
                'email' => $email,
                'password' => $password
            );
            if($this->updateEmailPassword($user_data))
                $this->logger->warning(
                    "Updated glesys password for account: " .  $email,
                    $this->logContext);
            else $this->logger->error(
                "Error updating mail password for account" . $uid);
        };
    }
    private function createImapFolders($user_data) {
        $server = 'mail.glesys.se';
        $email = $user_data['email'];
        $passw = $user_data['password'];
        $folders = array('Sent', 'Drafts', 'Trash', 'Junk', 'Archive');
        $mbox = \imap_open("{" . $server . "}", $email, $passw, OP_HALFOPEN);
        if(!$mbox){
            $message = "can't connect: " . \imap_last_error();
            $this->logger->error($message);
            return false;
        }
        foreach ($folders as $folder) {
            if (! @\imap_createmailbox(
                    $mbox,
                    \imap_utf7_encode("{".$server."}INBOX.".$folder))) {
                $message = 'Error creating ' . $folder . ' folder: ' .
                           \imap_last_error();
                $this->logger->error($message);
            }
        }
        \imap_close($mbox);
        return true;
    }
    private function createEmailAccount($user_data) {
        $keys = $this->config->getGlesysKeys();
        $fields = array(
            'emailaccount' => $user_data['email'],
            'password' => $user_data['password'],
            'quota' => $user_data['quota']
        );
        $query = http_build_query($fields);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,
                    'https://api.glesys.com/email/createaccount/');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_USERPWD, $keys);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $query);
        $result = curl_exec($ch);
        if (curl_errno($ch)) {
            $message = 'Error:' . curl_error($ch);
            $this->logger->error($message);
            return false;
        }
        curl_close($ch);
        $xml = simplexml_load_string($result);
        $code = $xml->status->code;
        if ($code == 200) return $this->createImapFolders($user_data);
        else $this->logger->warning(
            "Error: non-200 status: " . $xml->status->text);
        return false;
    }
    private function deleteEmailAccount($user_data){
        $ch = curl_init();
        $keys = $this->config->getGlesysKeys();
        curl_setopt($ch, CURLOPT_URL, 'https://api.glesys.com/email/delete/');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, "email=" . $user_data["email"]);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_USERPWD, $keys);
        $result = curl_exec($ch);
        if (curl_errno($ch)) {
            $message = 'Error: ' . curl_error($ch);
            $this->logger->error($message);
            return false;
        }
        curl_close($ch);
        return true;
    }
    private function updateEmailPassword($user_data) {
        $keys = $this->config->getGlesysKeys();
        $fields = array(
            'emailaccount' => $user_data['email'],
            'password' => $user_data['password']
        );
        $query = http_build_query($fields);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,
                    'https://api.glesys.com/email/editaccount/');
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_USERPWD, $keys);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $query);
        $result = curl_exec($ch);
        if (curl_errno($ch)) {
            $message = 'Error:' . curl_error($ch);
            $this->logger->error($message);
            return false;
        }
        curl_close($ch);
        $xml = simplexml_load_string($result);
        $code = $xml->status->code;
        if ($code != 200){
            $this->logger->warning(
                "Error: non-200 status: " .  $xml->status->text);
            return false;
        }
        return true;
    }
}