<?php

namespace App\Services;

use App\Models\Reservation;
use Carbon\Carbon;
use Illuminate\Support\Collection;

class ReservationExpiryService
{
    /**
     * 将「场次/活动日已过、仍为待核销、未核销」的预约标记为 expired。
     * - 场次模式：以 activity_days.session_end_at 为准（晚于「活动日」日历的场次结束时刻）。
     * - 非场次（仅日历日）：仍以 activity_date 早于今天为准。
     * - 抢票：入馆日 entry_date 早于今天。
     */
    public function expireStalePendingReservations(): int
    {
        $tz = (string) config('app.timezone');
        $today = Carbon::now($tz)->toDateString();
        $now = Carbon::now($tz);

        $ids = $this->stalePendingReservationIds($today, $now);
        if ($ids->isEmpty()) {
            return 0;
        }

        return Reservation::query()->whereIn('id', $ids)->update([
            'status' => 'expired',
            'updated_at' => now(),
        ]);
    }

    /**
     * @return Collection<int, int>
     */
    private function stalePendingReservationIds(string $today, Carbon $now): Collection
    {
        $idsActivity = Reservation::query()
            ->join('activity_days', 'activity_days.id', '=', 'reservations.activity_day_id')
            ->where('reservations.status', 'pending')
            ->whereNull('reservations.verified_at')
            ->whereNotNull('reservations.activity_day_id')
            ->where(function ($q) use ($today, $now) {
                $q->where(function ($q2) use ($now) {
                    $q2->whereNotNull('activity_days.session_start_at')
                        ->whereNotNull('activity_days.session_end_at')
                        ->whereNotNull('activity_days.booking_deadline_at')
                        ->where('activity_days.session_end_at', '<', $now);
                })->orWhere(function ($q2) use ($today) {
                    $q2->where(function ($q3) {
                        $q3->whereNull('activity_days.session_start_at')
                            ->orWhereNull('activity_days.session_end_at')
                            ->orWhereNull('activity_days.booking_deadline_at');
                    })->whereDate('activity_days.activity_date', '<', $today);
                });
            })
            ->where(function ($q) {
                $q->whereNull('reservations.reservation_kind')
                    ->orWhere('reservations.reservation_kind', Reservation::KIND_ACTIVITY);
            })
            ->pluck('reservations.id');

        $idsTicketGrab = Reservation::query()
            ->where('reservation_kind', Reservation::KIND_TICKET_GRAB)
            ->where('status', 'pending')
            ->whereNull('verified_at')
            ->whereNotNull('entry_date')
            ->whereDate('entry_date', '<', $today)
            ->pluck('id');

        return $idsActivity->merge($idsTicketGrab)->unique()->values();
    }
}