<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class ProductionIngredient extends Model
{
    protected $fillable = [
        'production_id',
        'ingredient_id',
        'stock_entry_id',
        'batch_key',
        'recipe_phase_id',
        'quantity_used',
    ];

    /**
     * F-04: Schlüssel für die Formular-Vorbelegung: Rohstoff + Rezeptur-Phase.
     * Zeilen ohne Phase (Altbestand/Rezeptur ohne Phasen) enden auf „|“.
     */
    public function formGroupKey(): string
    {
        return (int) $this->ingredient_id.'|'.($this->recipe_phase_id !== null ? (int) $this->recipe_phase_id : '');
    }

    /**
     * F-03: Chargen-Schlüssel für das Formular — im Entwurf der roh gespeicherte
     * batch_key, sonst aus dem aufgelösten Wareneingang abgeleitet.
     */
    public function formBatchKey(): string
    {
        if (! empty($this->batch_key)) {
            return (string) $this->batch_key;
        }

        return $this->stockEntry?->batchGroupKey() ?? 'e:'.$this->stock_entry_id;
    }

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

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

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

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