<?php

namespace App\Models;

use App\User;
use Database\Factories\StockEntryFactory;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\SoftDeletes;

class StockEntry extends Model
{
    /** @use HasFactory<StockEntryFactory> */
    use HasFactory;

    use SoftDeletes;

    protected $fillable = [
        'entry_type',
        'ingredient_id',
        'packaging_item_id',
        'supplier_id',
        'location_id',
        'unit',
        'ordered_by',
        'ordered_at',
        'ordered_quantity',
        'price_per_kg',
        'price_per_kg_gross',
        'price_total',
        'tax_rate_id',
        'tax_rate_percent',
        'received_by',
        'received_at',
        'received_quantity',
        'batch_number',
        'best_before',
        'quality_id',
        'status',
    ];

    /**
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'ordered_at' => 'date',
            'received_at' => 'date',
            'best_before' => 'date',
            'ordered_quantity' => 'decimal:2',
            'received_quantity' => 'decimal:2',
            'price_per_kg' => 'decimal:4',
            'price_per_kg_gross' => 'decimal:4',
            'price_total' => 'decimal:4',
            'tax_rate_percent' => 'decimal:2',
        ];
    }

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

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

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

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

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

    /**
     * @return BelongsTo<MaterialQuality, $this>
     */
    public function quality(): BelongsTo
    {
        return $this->belongsTo(MaterialQuality::class, 'quality_id');
    }

    /**
     * @return BelongsTo<User, $this>
     */
    public function orderedByUser(): BelongsTo
    {
        return $this->belongsTo(User::class, 'ordered_by');
    }

    /**
     * @return BelongsTo<User, $this>
     */
    public function receivedByUser(): BelongsTo
    {
        return $this->belongsTo(User::class, 'received_by');
    }

    public function isPending(): bool
    {
        return $this->status === 'pending';
    }

    /**
     * AP-27: Gruppierungsschlüssel für die Chargen-Zusammenführung.
     * Einträge mit Chargennummer werden je Charge zusammengefasst,
     * Einträge ohne Chargennummer bleiben einzeln.
     * Audit N-1 (Kundenentscheid 15.07.2026): Chargennummern kommen von
     * extern und können kollidieren — der Lieferant gehört zum Schlüssel,
     * damit gleiche Lot-Nummern verschiedener Lieferanten getrennt bleiben.
     */
    public function batchGroupKey(): string
    {
        $batch = trim((string) $this->batch_number);

        return $batch !== '' ? 'b:'.((int) $this->supplier_id).':'.$batch : 'e:'.$this->id;
    }

    public function isReceived(): bool
    {
        return $this->status === 'received';
    }
}