feat: add support for multiple event dates in variants

- Updated the FeaturedGroupService to include 'variants.eventDates' in the items query.
- Introduced a BelongsToMany relationship in EventDate for selected variants.
- Modified PurchaseItemResource and PurchaseItemSnapshotFactory to handle multiple event dates for variants.
- Enhanced StartCheckoutService to load event dates for variants.
- Updated TicketGeneratorService to accommodate event dates in ticket generation.
- Created migrations to support multi-value event dates and allow multiple variant values per attribute.
- Adjusted seeders to reflect new event date handling and added new attributes.
- Added tests to ensure correct functionality for multi-date variants and their integration with ticket generation.

app/Domains/Catalog/Models/Variant.php

@@ -11,6 +11,7 @@ use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Support\Collection;
 
 #[Fillable([
     'catalog_item_id',
@@ -46,6 +47,17 @@ class Variant extends Model
         return $this->belongsTo(EventDate::class);
     }
 
+    /** @return BelongsToMany<EventDate, $this> */
+    public function eventDates(): BelongsToMany
+    {
+        return $this->belongsToMany(
+            EventDate::class,
+            'variant_event_dates',
+            'variant_id',
+            'event_date_id',
+        )->orderBy('date')->orderBy('time_start');
+    }
+
     /** @return HasMany<Ticket, $this> */
     public function sourceTickets(): HasMany
     {
@@ -92,4 +104,39 @@ class Variant extends Model
     {
         return $this->catalogItem->nombre;
     }
+
+    /** @return Collection<string, string|array<int, string>> */
+    public function selectionValues(): Collection
+    {
+        $values = $this->definitions
+            ->mapWithKeys(fn ($definition) => [
+                $definition->itemAttribute?->attribute?->codigo => $definition->value,
+            ])
+            ->filter(fn ($value, $key): bool => $key !== null);
+
+        $eventDateIds = $this->selectedEventDates()
+            ->pluck('id')
+            ->map(fn ($id): string => (string) $id)
+            ->values();
+
+        if ($eventDateIds->count() === 1) {
+            $values->put('event_date', $eventDateIds->first());
+        } elseif ($eventDateIds->isNotEmpty()) {
+            $values->put('event_date', $eventDateIds->all());
+        }
+
+        return $values;
+    }
+
+    /** @return Collection<int, EventDate> */
+    public function selectedEventDates(): Collection
+    {
+        $eventDates = $this->eventDates;
+
+        if ($eventDates->isEmpty() && $this->event_date_id !== null && $this->eventDate !== null) {
+            return collect([$this->eventDate]);
+        }
+
+        return $eventDates;
+    }
 }