<?php

namespace App\Services\Admin\Master;

use App\Models\Product;
use App\Models\ProductPrice;
use App\Models\ProductVariant;
use App\Services\NotificationService;
use App\Services\S3PresignedService;
use Illuminate\Contracts\Pagination\LengthAwarePaginator;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Str;
use Spatie\MediaLibrary\MediaCollections\Models\Media;

class ProductService
{
    public function __construct(
        private S3PresignedService $s3Service = new S3PresignedService,
    ) {}

    public function getAll(array $filters = []): Collection
    {
        $products = Product::select('id', 'name', 'slug', 'description', 'status')
            ->with([
                'categories:id,name',
                'productVariants:id,product_id,name,stock,reject_stock,retail_stock',
                'productVariants.productPrices:id,variant_id,type,price',
                'productVariants.media',
            ])
            ->when($filters['status'] ?? null, fn ($q, $status) => $q->where('status', $status))
            ->when($filters['name'] ?? null, fn ($q, $name) => $q->where('name', 'like', "%{$name}%"))
            ->latest()
            ->get();

        $products->each(function ($product) {
            $product->productVariants->each(function ($variant) {
                $media = $variant->getMedia('photos')->first();
                $variant->photo_url = $media
                    ? $this->s3Service->getTemporaryUrl($media->file_name)
                    : null;
            });
        });

        return $products;
    }

    public function paginated(int $perPage = 15, string $search = '', string $sort = 'created_at', string $direction = 'desc', array $filters = []): LengthAwarePaginator
    {
        $paginator = Product::query()
            ->select('id', 'name', 'slug', 'description', 'status')
            ->with([
                'categories:id,name',
                'productVariants:id,product_id,name,stock,reject_stock,retail_stock',
                'productVariants.productPrices:id,variant_id,type,price',
            ])
            ->when($search, fn ($q) => $q->where('name', 'like', "%{$search}%"))
            ->when($filters['status'] ?? null, fn ($q, $status) => $q->where('status', $status))
            ->orderBy($sort, $direction)
            ->paginate($perPage);

        $paginator->getCollection()->each(function ($product) {
            $product->productVariants->each(function ($variant) {
                $media = $variant->getMedia('photos')->first();
                $variant->photo_url = $media
                    ? $this->s3Service->getTemporaryUrl($media->file_name)
                    : null;
            });
        });

        return $paginator;
    }

    public function create(array $data): Product
    {
        $product = DB::transaction(function () use ($data) {
            $product = Product::create([
                'name' => $data['name'],
                'description' => $data['description'] ?? null,
                'status' => $data['status'] ?? 'active',
            ]);

            $product->categories()->sync($data['category_ids']);

            $useSamePrice = $data['use_same_price'] ?? false;

            foreach ($data['variants'] as $index => $variantData) {
                $variant = $product->productVariants()->create([
                    'name' => $variantData['name'],
                    'stock' => $variantData['stock'],
                    'reject_stock' => $variantData['reject_stock'],
                    'retail_stock' => $variantData['retail_stock'],
                ]);

                $prices = $useSamePrice
                    ? $data['shared_prices']
                    : $variantData['prices'];

                foreach ($prices as $priceData) {
                    ProductPrice::create([
                        'variant_id' => $variant->id,
                        'type' => $priceData['type'],
                        'price' => $priceData['price'],
                    ]);
                }

                if (! empty($variantData['photo_key'])) {
                    $this->registerPhotos($variant, [$variantData['photo_key']]);
                }
            }

            return $product;
        });

        NotificationService::notify(
            roles: ['Owner', 'Developer', 'Direktur', 'Admin Toko'],
            title: 'Produk Baru',
            body: "Produk \"{$product->name}\" berhasil ditambahkan".' oleh '.auth()->user()->full_name.'.',
            url: route('admin.master.products.index'),
        );

        return $product;
    }

    public function getForEdit(Product $product): array
    {
        $product->load([
            'categories:id,name',
            'productVariants.productPrices',
            'productVariants.media',
        ]);

        $variants = $product->productVariants->map(function (ProductVariant $variant) {
            $media = $variant->getMedia('photos')->first();

            return [
                'id' => $variant->id,
                'name' => $variant->name,
                'stock' => $variant->stock,
                'reject_stock' => $variant->reject_stock,
                'retail_stock' => $variant->retail_stock,
                'photo_key' => $media?->file_name,
                'photo_url' => $media ? $this->s3Service->getTemporaryUrl($media->file_name) : null,
                'prices' => $variant->productPrices->map(fn ($p) => [
                    'type' => $p->type->value,
                    'price' => $p->price,
                ]),
            ];
        });

        return [
            'id' => $product->id,
            'name' => $product->name,
            'description' => $product->description,
            'status' => $product->status->value,
            'category_ids' => $product->categories->pluck('id'),
            'product_variants' => $variants,
        ];
    }

    public function update(Product $product, array $data): Product
    {
        $product = DB::transaction(function () use ($product, $data) {
            $product->update([
                'name' => $data['name'],
                'description' => $data['description'] ?? null,
                'status' => $data['status'] ?? $product->status,
            ]);

            $product->categories()->sync($data['category_ids']);

            $useSamePrice = $data['use_same_price'] ?? false;

            $existingVariantIds = collect($data['variants'])
                ->pluck('id')
                ->filter()
                ->toArray();

            $product->productVariants()
                ->whereNotIn('id', $existingVariantIds)
                ->each(function (ProductVariant $variant) {
                    $variant->productPrices()->delete();
                    $variant->clearMediaCollection('photos');
                    $variant->delete();
                });

            foreach ($data['variants'] as $variantData) {
                $variantId = $variantData['id'] ?? null;

                $variant = $variantId
                    ? $product->productVariants()->findOrFail($variantId)
                    : $product->productVariants()->create([]);

                $variant->update([
                    'name' => $variantData['name'],
                    'stock' => $variantData['stock'],
                    'reject_stock' => $variantData['reject_stock'],
                    'retail_stock' => $variantData['retail_stock'],
                ]);

                $variant->productPrices()->delete();

                $prices = $useSamePrice
                    ? $data['shared_prices']
                    : $variantData['prices'];

                foreach ($prices as $priceData) {
                    ProductPrice::create([
                        'variant_id' => $variant->id,
                        'type' => $priceData['type'],
                        'price' => $priceData['price'],
                    ]);
                }

                if (! empty($variantData['photo_key'])) {
                    $variant->clearMediaCollection('photos');
                    $this->registerPhotos($variant, [$variantData['photo_key']]);
                }
            }

            return $product;
        });

        NotificationService::notify(
            roles: ['Owner', 'Developer', 'Direktur', 'Admin Toko'],
            title: 'Produk Diperbarui',
            body: "Produk \"{$product->name}\" berhasil diperbarui".' oleh '.auth()->user()->full_name.'.',
            url: route('admin.master.products.index'),
        );

        return $product;
    }

    public function delete(Product $product): bool
    {
        return DB::transaction(function () use ($product) {
            $product->productVariants->each(function (ProductVariant $variant) {
                $variant->productPrices()->delete();
                $variant->clearMediaCollection('photos');
                $variant->delete();
            });

            $product->categories()->detach();

            return $product->delete();
        });
    }

    public function toggleStatus(Product $product): void
    {
        $product->update([
            'status' => $product->status->value === 'active' ? 'inactive' : 'active',
        ]);
    }

    private function registerPhotos(ProductVariant $variant, array $photoKeys): void
    {
        foreach ($photoKeys as $order => $s3Key) {
            $fileName = pathinfo($s3Key, PATHINFO_BASENAME);
            $name = pathinfo($s3Key, PATHINFO_FILENAME);

            Media::create([
                'model_type' => ProductVariant::class,
                'model_id' => $variant->id,
                'uuid' => Str::uuid(),
                'collection_name' => 'photos',
                'name' => $name,
                'file_name' => $s3Key,
                'mime_type' => 'image/jpeg',
                'disk' => 's3',
                'conversions_disk' => 's3',
                'size' => 0,
                'manipulations' => [],
                'custom_properties' => [],
                'generated_conversions' => [],
                'responsive_images' => [],
                'order_column' => $order + 1,
            ]);
        }
    }
}