<?php
namespace DayTidy\Modules\Notifications;

use DayTidy\Calendar\IcsRenderer;
use DayTidy\Entities\Booking;
use DateTimeImmutable;
use DateTimeZone;

class Ics
{
    private IcsRenderer $renderer;

    public function __construct(?IcsRenderer $renderer = null)
    {
        $this->renderer = $renderer ?: new IcsRenderer();
    }

    public function create(Booking $booking): string
    {
        $offering = $booking->offering();
        $session = $booking->getData()->getFirstSession();

        if (!$offering || !$session || !strtotime($session)) return '';

        $start = new DateTimeImmutable($session, new DateTimeZone('UTC'));
        $end = $start->add($offering->getInterval());

        try
        {
            if ($end <= $start) $end = $start->add(new \DateInterval('PT1H'));
        }
        catch (\Throwable $e)
        {
            $end = $start->add(new \DateInterval('PT1H'));
        }

        $upload = wp_upload_dir();
        $dir = trailingslashit($upload['basedir']) . 'daytidy-notifications';
        if (!wp_mkdir_p($dir)) return '';

        $filename = wp_unique_filename(
            $dir,
            'daytidy-booking-' . $booking->id() . '-' . time() . '.ics'
        );
        $path = trailingslashit($dir) . $filename;

        $offering_post = $offering->get();
        $host = wp_parse_url(home_url('/'), PHP_URL_HOST);
        $uid = 'daytidy-booking-' . $booking->id() . '-' . $booking->refId() . '@' . ($host ?: 'daytidy');

        $written = file_put_contents($path, $this->renderer->render([[
            'uid' => $uid,
            'start' => $start,
            'end' => $end,
            'summary' => $offering_post ? $offering_post->post_title : '',
            'description' => sprintf(
                // translators: Placeholder values.
                esc_html__('Booking Ref: %s', 'daytidy'),
                $booking->refId()
            ),
            'url' => get_permalink($offering->id()),
            'status' => 'CONFIRMED',
        ]], esc_html__('DayTidy Booking', 'daytidy')));

        return $written ? $path : '';
    }
}