<?php

namespace App\Domains\Cart\Services;

use App\Domains\Cart\Models\Cart;
use App\Domains\Catalog\Models\StockReservation;
use App\Domains\Catalog\Services\StockReservationService;
use App\Domains\Purchase\Models\Purchase;
use Illuminate\Support\Facades\DB;

class ExpireCartReservationsService
{
    public function __construct(
        private readonly StockReservationService $reservations,
    ) {}

    public function expireOverdue(): int
    {
        $expired = 0;
        $lastReservationId = 0;

        do {
            $reservationIds = StockReservation::query()
                ->where('status', StockReservation::STATUS_ACTIVE)
                ->whereNotNull('expires_at')
                ->where('expires_at', '<=', now())
                ->where('id', '>', $lastReservationId)
                ->whereHas('currentCart', fn ($query) => $query->where('status', 'active'))
                ->whereDoesntHave('purchase', fn ($query) => $query->whereIn('status', [
                    Purchase::STATUS_CREATED,
                    Purchase::STATUS_PENDING_PAYMENT,
                    Purchase::STATUS_IN_REVIEW,
                ]))
                ->orderBy('id')
                ->limit(500)
                ->pluck('id');

            foreach ($reservationIds as $reservationId) {
                $lastReservationId = (int) $reservationId;

                if ($this->expireReservation($lastReservationId)) {
                    $expired++;
                }
            }
        } while ($reservationIds->count() === 500);

        return $expired;
    }

    private function expireReservation(int $reservationId): bool
    {
        $cartId = Cart::query()
            ->where('current_stock_reservation_id', $reservationId)
            ->where('status', 'active')
            ->value('id');
        if ($cartId === null) {
            return false;
        }

        return DB::transaction(function () use ($cartId, $reservationId): bool {
            /** @var Cart|null $cart */
            $cart = Cart::query()
                ->whereKey($cartId)
                ->where('current_stock_reservation_id', $reservationId)
                ->where('status', 'active')
                ->lockForUpdate()
                ->first();
            if ($cart === null) {
                return false;
            }

            /** @var StockReservation|null $reservation */
            $reservation = StockReservation::query()->lockForUpdate()->find($reservationId);
            if ($reservation === null
                || $reservation->status !== StockReservation::STATUS_ACTIVE
                || $reservation->expires_at === null
                || $reservation->expires_at->isFuture()) {
                return false;
            }

            $this->reservations->expire($reservation);

            return true;
        });
    }
}