<?php

namespace App\Domains\FiestaFutbolInfantil\Services;

use App\Domains\Catalog\Enums\EventProductType;
use App\Domains\Catalog\Enums\InventoryPolicy;
use App\Domains\Catalog\Models\CatalogItem;
use App\Domains\Catalog\Models\Category;
use App\Domains\Catalog\Models\Inventory;
use App\Domains\Catalog\Models\Variant;
use App\Domains\Catalog\Services\CatalogService;
use App\Domains\Tenant\Models\Tenant;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Illuminate\Validation\ValidationException;

class EntryService
{
    public function __construct(private readonly CatalogService $catalogService) {}

    /** @return Collection<int, CatalogItem> */
    public function all(Tenant $tenant): Collection
    {
        return CatalogItem::query()
            ->where('tenant_code', $tenant->codigo)
            ->where('event_product_type', EventProductType::Entry->value)
            ->with([
                'variants.inventory',
                'variants.eventDate',
                'variants.eventDates',
            ])
            ->orderBy('id')
            ->get();
    }

    /**
     * @param  array<int, array<string, mixed>>  $entries
     * @return Collection<int, CatalogItem>
     */
    public function upsertMany(Tenant $tenant, array $entries): Collection
    {
        return DB::transaction(function () use ($tenant, $entries): Collection {
            $reservedSlugs = [];
            $category = Category::query()->firstOrCreate([
                'tenant_code' => $tenant->codigo,
                'nombre' => 'Entradas',
            ]);

            return collect($entries)->map(function (array $entry, int $index) use ($tenant, $category, &$reservedSlugs): CatalogItem {
                if (isset($entry['id'])) {
                    return $this->update($tenant, $category, $entry, $index);
                }

                $slug = $this->uniqueSlug($tenant, $entry['title'], $reservedSlugs);
                $reservedSlugs[] = $slug;

                return $this->catalogService->create([
                    'tenant_code' => $tenant->codigo,
                    'slug' => $slug,
                    'nombre' => $entry['title'],
                    'descripcion' => $entry['description'] ?? null,
                    'category_id' => $category->id,
                    'precio' => $entry['price'],
                    'event_product_type' => EventProductType::Entry->value,
                    'has_tickets' => true,
                    'inventory_policy' => InventoryPolicy::Tracked->value,
                    'attribute_codes' => ['event_date'],
                    'multi_select_attribute_codes' => ['event_date'],
                    'variants' => [[
                        'real_stock' => $entry['stock'],
                        'event_date_ids' => array_values($entry['event_date_ids']),
                    ]],
                ]);
            })->values();
        });
    }

    /** @param array<string, mixed> $entry */
    private function update(Tenant $tenant, Category $category, array $entry, int $index): CatalogItem
    {
        $catalogItem = CatalogItem::query()
            ->whereKey($entry['id'])
            ->where('tenant_code', $tenant->codigo)
            ->where('event_product_type', EventProductType::Entry->value)
            ->lockForUpdate()
            ->firstOrFail();

        $variants = Variant::query()
            ->where('catalog_item_id', $catalogItem->id)
            ->lockForUpdate()
            ->get();

        if ($variants->count() !== 1) {
            throw ValidationException::withMessages([
                "entries.{$index}.id" => [
                    'La entrada no posee una única variante editable.',
                ],
            ]);
        }

        $variant = $variants->first();
        $inventory = Inventory::query()
            ->whereKey($variant->inventory_id)
            ->lockForUpdate()
            ->firstOrFail();

        if ((int) $entry['stock'] < $inventory->reserved_stock) {
            throw ValidationException::withMessages([
                "entries.{$index}.stock" => [
                    'El stock no puede ser menor que la cantidad actualmente reservada.',
                ],
            ]);
        }

        $eventDateIds = collect($entry['event_date_ids'])
            ->map(fn ($id): int => (int) $id)
            ->unique()
            ->values();

        $catalogItem->update([
            'nombre' => $entry['title'],
            'descripcion' => $entry['description'] ?? null,
            'category_id' => $category->id,
            'precio' => $entry['price'],
            'has_tickets' => true,
            'inventory_policy' => InventoryPolicy::Tracked->value,
        ]);
        $variant->update([
            'event_date_id' => $eventDateIds->count() === 1 ? $eventDateIds->first() : null,
        ]);
        $variant->eventDates()->sync($eventDateIds->all());
        $catalogItem->itemAttributes()
            ->whereHas('attribute', fn ($query) => $query->where('codigo', 'event_date'))
            ->update(['allow_multi_select' => true]);
        $inventory->update(['real_stock' => $entry['stock']]);

        return $catalogItem->load([
            'variants.inventory',
            'variants.eventDate',
            'variants.eventDates',
        ]);
    }

    /** @param array<int, string> $reservedSlugs */
    private function uniqueSlug(Tenant $tenant, string $title, array $reservedSlugs): string
    {
        $baseSlug = Str::slug($title) ?: 'entrada';
        $slug = $baseSlug;
        $suffix = 2;

        while (
            in_array($slug, $reservedSlugs, true)
            || CatalogItem::query()
                ->where('tenant_code', $tenant->codigo)
                ->where('slug', $slug)
                ->exists()
        ) {
            $slug = "{$baseSlug}-{$suffix}";
            $suffix++;
        }

        return $slug;
    }
}