<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Stock extends Model
{
    use HasFactory;

    protected $fillable = [
        'product_id',
        'dealer_id',
        'quantity'
    ];

    public function product()
    {
        return $this->belongsTo(Product::class);
    }

    public function dealer()
    {
        return $this->belongsTo(Dealer::class);
    }

    public function stockLogs()
    {
        return $this->hasMany(StockLog::class);
    }

    // Method untuk mengupdate stock
    public function updateStock($newQuantity, $source, $description = null)
    {
        $previousQuantity = $this->quantity;
        $quantityChange = $newQuantity - $previousQuantity;
        
        $this->quantity = $newQuantity;
        $this->save();

        // Buat log perubahan
        StockLog::create([
            'stock_id' => $this->id,
            'source_type' => get_class($source),
            'source_id' => $source->id,
            'previous_quantity' => $previousQuantity,
            'new_quantity' => $newQuantity,
            'quantity_change' => $quantityChange,
            'description' => $description,
            'user_id' => auth()->id()
        ]);

        return $this;
    }
}