<?php

namespace App\Console\Commands;

use App\EmailLog;
use App\Facade\UserConfig;
use App\Http\Middleware\GlobalConfiguration;
use Illuminate\Console\Command;
use Illuminate\Mail\Message;

class SendEmailsCommand extends Command
{
    private $maxPerBatch;
    private $numberOfAttempts;
    private $secondsBetweenPolls;

    /**
     * The name and signature of the console command.
     *
     * @var string
     */
    protected $signature = 'bt-queue:send-emails {--poll}';

    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'Sends e-mails queued in the database.';

    /**
     * Create a new command instance.
     *
     * @return void
     */
    public function __construct()
    {
        parent::__construct();

        $this->maxPerBatch = config('mail.queue.emails_per_batch');
        $this->numberOfAttempts = config('mail.queue.max_attempts');
        $this->secondsBetweenPolls = config('mail.queue.seconds_between_polls');
    }

    /**
     * Execute the console command.
     *
     * @return mixed
     */
    public function handle()
    {
        if (!UserConfig::get('queue_emails'))
        {
            $this->output->error('E-mail queueing is not enabled. E-mails are being sent immediately.');
        }

        $this->output->writeln('Setting mail configuration');

        GlobalConfiguration::updateMailConfig();

        $this->output->writeln('E-mail queue runner started');

        while (true)
        {
            $emailsToSend = EmailLog::where([
                ['sent_at', null],
                ['number_attempts', '<', $this->numberOfAttempts]
            ])->limit($this->maxPerBatch)->get();

            $this->output->writeln(sprintf(
                '%d e-mail%s to send',
                $emailsToSend->count(),
                $emailsToSend->count() == 1 ? '' : 's'
            ));

            /** @var EmailLog $emailToSend */
            foreach ($emailsToSend as $emailToSend)
            {
                $this->sendEmail($emailToSend);
            }

            if (!$this->option('poll'))
            {
                exit();
            }

            sleep($this->secondsBetweenPolls);
        }
    }

    private function sendEmail(EmailLog $emailLog)
    {
        $this->output->writeln(sprintf('Sending message with subject \'%s\'', $emailLog->subject));

        try
        {
            app('mailer')->send(
                [],
                [],
                function (Message $message) use ($emailLog)
                {
                    $message->setFrom($emailLog->sender_address, $emailLog->sender_name);
                    $message->setSubject($emailLog->subject);

                    $this->addAddresses($emailLog->to_addresses, $message, 'To');
                    $this->addAddresses($emailLog->cc_addresses, $message, 'Cc');
                    $this->addAddresses($emailLog->bcc_addresses, $message, 'Bcc');

                    $message->addPart($emailLog->body_plain, 'text/plain');
                    $message->setBody($emailLog->body_html, 'text/html');
                }
            );

            $emailLog->sent_at = new \DateTime();

            $this->output->writeln('Send completed');
        }
        catch (\Exception $ex)
        {
            $this->output->error(sprintf('Send failed: %s', $ex->getMessage()));
        }
        finally
        {
            $emailLog->number_attempts++;
            $emailLog->save();
        }
    }

    private function addAddresses($dbFieldData, Message $message, $property)
    {
        $decoded = json_decode($dbFieldData);

        if (is_array($decoded))
        {
            foreach ($decoded as $addressInfo)
            {
                $this->output->writeln(sprintf('Adding %s address: \'"%s" <%s>\'', $property, $addressInfo->name, $addressInfo->address));

                $message->{"set{$property}"}($addressInfo->address, $addressInfo->name);
            }
        }
    }
}