shopit-back/app/Domains/Ticket/Services/TicketGeneratorService.php

<?php

namespace App\Domains\Ticket\Services;

use App\Domains\Auth\Models\User;
use App\Domains\Catalog\Models\CatalogItem;
use App\Domains\Catalog\Models\Variant;
use App\Domains\Event\Models\EventDate;
use App\Domains\Ticket\Enums\ValidityTimeType;
use App\Domains\Ticket\Exceptions\TicketGenerationException;
use App\Domains\Ticket\Models\Ticket;
use App\Domains\Ticket\Models\ValidityTime;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;

class TicketGeneratorService
{
    /**
     * @return Collection<int, Ticket>
     */
    public function generate(
        CatalogItem $catalogItem,
        User $user,
        int $quantity = 1,
        ?int $sourceVariantId = null,
        ?int $sourcePurchaseId = null,
    ): Collection {
        if ($quantity < 1) {
            throw TicketGenerationException::invalidQuantity();
        }

        return DB::transaction(function () use ($catalogItem, $user, $quantity, $sourceVariantId, $sourcePurchaseId): Collection {
            $targets = $this->resolveTargets(
                $catalogItem,
                $quantity,
                $sourceVariantId,
            );
            $fixedValidityTimes = [];

            return $targets->map(function (array $target) use (
                &$fixedValidityTimes,
                $sourcePurchaseId,
                $user,
            ): Ticket {
                $item = $target['catalog_item'];
                $variant = $target['variant'];
                $eventDate = $target['event_date'];
                $validityTime = $this->resolveValidityTime($item, $variant);
                $validityTime = $this->materializeEventDateValidityTime(
                    $variant,
                    $eventDate,
                    $validityTime,
                    $fixedValidityTimes,
                );

                return Ticket::query()->create([
                    'tenant_code' => $item->tenant_code,
                    'ticket' => (string) Str::uuid(),
                    'name' => $item->nombre,
                    'description' => (string) ($item->descripcion ?? ''),
                    'source_purchase_id' => $sourcePurchaseId,
                    'source_catalog_item_id' => $item->getKey(),
                    'source_variant_id' => $variant?->getKey(),
                    'validity_time_id' => $validityTime?->getKey(),
                    'used_at' => null,
                    'user_id' => $user->getKey(),
                ]);
            });
        });
    }

    /**
     * @return Collection<int, array{catalog_item: CatalogItem, variant: Variant|null, event_date: EventDate|null}>
     */
    private function resolveTargets(
        CatalogItem $catalogItem,
        int $quantity,
        ?int $sourceVariantId,
    ): Collection {
        if (! $catalogItem->isBundle()) {
            $variant = $this->resolveVariant($catalogItem, $sourceVariantId);
            $this->validateTarget($catalogItem, $variant);

            return $this->targetsForVariant($catalogItem, $variant, $quantity);
        }

        $catalogItem->loadMissing([
            'bundleComponents.catalogItem',
            'bundleComponents.variant.catalogItem',
        ]);

        if ($catalogItem->bundleComponents->isEmpty()) {
            throw TicketGenerationException::emptyBundle($catalogItem);
        }

        return $catalogItem->bundleComponents
            ->flatMap(function ($component) use ($quantity): Collection {
                $componentItem = $component->catalogItem;
                $variant = $component->variant;
                $this->validateTarget($componentItem, $variant);

                return $this->targetsForVariant(
                    $componentItem,
                    $variant,
                    $quantity * $component->quantity,
                );
            })
            ->values();
    }

    /**
     * @return Collection<int, array{catalog_item: CatalogItem, variant: Variant|null, event_date: EventDate|null}>
     */
    private function targetsForVariant(
        CatalogItem $catalogItem,
        ?Variant $variant,
        int $quantity,
    ): Collection {
        if ($variant === null) {
            return Collection::times($quantity, fn (): array => [
                'catalog_item' => $catalogItem,
                'variant' => null,
                'event_date' => null,
            ]);
        }

        $variant->loadMissing(['eventDates', 'eventDate']);
        $selectedEventDates = $variant->selectedEventDates();
        $eventDates = $selectedEventDates->isEmpty()
            ? collect([null])
            : $selectedEventDates;

        return Collection::times($quantity)
            ->flatMap(fn () => $eventDates->map(fn (?EventDate $eventDate): array => [
                'catalog_item' => $catalogItem,
                'variant' => $variant,
                'event_date' => $eventDate,
            ]))
            ->values();
    }

    private function resolveVariant(
        CatalogItem $catalogItem,
        ?int $sourceVariantId,
    ): ?Variant {
        if ($sourceVariantId === null) {
            return null;
        }

        $variant = $catalogItem->variants()
            ->whereKey($sourceVariantId)
            ->first();

        if ($variant === null) {
            throw TicketGenerationException::variantNotFound(
                $catalogItem,
                $sourceVariantId,
            );
        }

        $variant->setRelation('catalogItem', $catalogItem);

        return $variant;
    }

    private function validateTarget(
        CatalogItem $catalogItem,
        ?Variant $variant,
    ): void {
        if (! $catalogItem->has_tickets) {
            throw TicketGenerationException::ticketsDisabled($catalogItem);
        }

    }

    private function resolveValidityTime(
        CatalogItem $catalogItem,
        ?Variant $variant,
    ): ?ValidityTime {
        if ($catalogItem->validity_time_id !== null) {
            return $catalogItem->validityTime;
        }

        if ($variant === null) {
            return null;
        }

        $variant->loadMissing('definitions.itemAttribute.attribute.options.validityTime');

        $validityTimes = $variant->definitions
            ->map(function ($definition): ?ValidityTime {
                $option = $definition->itemAttribute?->attribute?->options
                    ->firstWhere('value', $definition->value);

                return $option?->validityTime;
            })
            ->filter()
            ->unique(fn (ValidityTime $validityTime): int => $validityTime->getKey())
            ->values();

        if ($validityTimes->count() > 1) {
            throw TicketGenerationException::ambiguousValidityTime($catalogItem);
        }

        return $validityTimes->first();
    }

    /**
     * Convert a recurring time window into the fixed date and time purchased by
     * the customer. Equal tickets generated together share the same snapshot.
     *
     * @param  array<string, ValidityTime>  $fixedValidityTimes
     */
    private function materializeEventDateValidityTime(
        ?Variant $variant,
        ?EventDate $eventDate,
        ?ValidityTime $validityTime,
        array &$fixedValidityTimes,
    ): ?ValidityTime {
        if (
            $variant === null
            || $eventDate === null
        ) {
            return $validityTime;
        }

        if ($validityTime !== null && $validityTime->type !== ValidityTimeType::TimeWindow) {
            return $validityTime;
        }

        $cacheKey = $eventDate->getKey().':'.($validityTime?->getKey() ?? 'event');

        if (isset($fixedValidityTimes[$cacheKey])) {
            return $fixedValidityTimes[$cacheKey];
        }

        $startsAt = $validityTime?->startsAt($eventDate->date) ?? $eventDate->startsAt();
        $expiresAt = $validityTime?->expiresAt($eventDate->date) ?? $eventDate->endsAt();

        if (
            $startsAt !== null
            && $expiresAt !== null
            && $expiresAt->lessThanOrEqualTo($startsAt)
        ) {
            $expiresAt = $expiresAt->addDay();
        }

        return $fixedValidityTimes[$cacheKey] = ValidityTime::query()->create([
            'type' => ValidityTimeType::FixedWindow,
            'start_time' => null,
            'end_time' => null,
            'fixed_starts_at' => $startsAt,
            'fixed_expires_at' => $expiresAt,
        ]);
    }
}