<?php

namespace App\Models;

use Database\Factories\PackagingItemFactory;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class PackagingItem extends Model
{
    /** @use HasFactory<PackagingItemFactory> */
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'packaging_material_id',
        'supplier_id',
        'name',
        'category',
        'weight_grams',
        'min_stock_alert',
        'url',
        'product_id',
        'storage_room_id',
        'storage_shelf_id',
        'storage_slot_id',
        'active',
    ];

    /**
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'active' => 'boolean',
            'weight_grams' => 'decimal:2',
        ];
    }

    /**
     * @return BelongsTo<PackagingMaterial, $this>
     */
    public function packagingMaterial(): BelongsTo
    {
        return $this->belongsTo(PackagingMaterial::class);
    }

    /**
     * @return BelongsTo<Supplier, $this>
     */
    public function supplier(): BelongsTo
    {
        return $this->belongsTo(Supplier::class);
    }

    /**
     * @return BelongsTo<Product, $this>
     */
    public function product(): BelongsTo
    {
        return $this->belongsTo(Product::class);
    }

    /**
     * Produkte, die diesen Verpackungsartikel in der Stückliste führen (BOM).
     *
     * @return BelongsToMany<Product, $this>
     */
    public function products(): BelongsToMany
    {
        return $this->belongsToMany(Product::class, 'product_packagings')
            ->withPivot('quantity', 'pos')
            ->withTimestamps();
    }

    /**
     * AP-51: Lagerplatz (Raum/Regal/Fach) — gleiche Hierarchie wie beim Rohstoff.
     *
     * @return BelongsTo<StorageRoom, $this>
     */
    public function storageRoom(): BelongsTo
    {
        return $this->belongsTo(StorageRoom::class);
    }

    /**
     * @return BelongsTo<StorageShelf, $this>
     */
    public function storageShelf(): BelongsTo
    {
        return $this->belongsTo(StorageShelf::class);
    }

    /**
     * @return BelongsTo<StorageSlot, $this>
     */
    public function storageSlot(): BelongsTo
    {
        return $this->belongsTo(StorageSlot::class);
    }

    /**
     * Lagerplatz-Anzeige im Schema „Raum 1 | Regal 3 | A" (nur gepflegte Teile).
     */
    public function storageLabel(): ?string
    {
        $parts = array_filter([
            $this->storageRoom?->label,
            $this->storageShelf?->label,
            $this->storageSlot?->label,
        ]);

        return $parts === [] ? null : implode(' | ', $parts);
    }
}