<?php

declare(strict_types=1);

namespace App\Enum;

/**
 * Room type as the website's travel search filters it ("Zimmerarten").
 *
 * Taken from the room's capacity, as TYPO3's RoomTypeResolver does since the room-code
 * mapping was retired: `maxPax` 1-8 maps directly, 9 and up is "9er+". A bed shared with
 * other customers is sold per bed (`maxPax` 1), so it is recognised by its label instead;
 * without that, a bed in a dorm would count as an Einzelzimmer.
 */
enum RoomType: string
{
    case ForOne = 'EZ';
    case ForTwo = 'DZ';
    case ForThree = '3er';
    case ForFour = '4er';
    case ForFive = '5er';
    case ForSix = '6er';
    case ForSeven = '7er';
    case ForEight = '8er';
    case ForNinePlus = '9er+';
    case WithOthers = 'mit anderen';

    /** The "Babypreis 0-2 Jährige" row: priced like a room, but not one. */
    public const BABY_CODE = 'Baby';

    /** Label phrases (lower case) that mark a bed shared with other customers. */
    private const WITH_OTHERS_MARKERS = ['bett im', 'mit ander'];

    /**
     * Null for the baby row, which is not a room.
     */
    public static function classify(?string $code, ?string $label, ?int $maxPax, ?int $minPax): ?self
    {
        if (self::BABY_CODE === trim((string) $code)) {
            return null;
        }

        $label = mb_strtolower((string) $label);
        foreach (self::WITH_OTHERS_MARKERS as $marker) {
            if (str_contains($label, $marker)) {
                return self::WithOthers;
            }
        }

        $pax = ($maxPax ?? 0) > 0 ? (int) $maxPax : (int) $minPax;

        return match (true) {
            $pax >= 9 => self::ForNinePlus,
            $pax >= 1 => [1 => self::ForOne, self::ForTwo, self::ForThree, self::ForFour, self::ForFive, self::ForSix, self::ForSeven, self::ForEight][$pax],
            // No usable occupancy: TYPO3 files it under "mit anderen" as well.
            default => self::WithOthers,
        };
    }
}