<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     */
    public function up(): void
    {
        Schema::table('transferencias_bodega', function (Blueprint $table) {
            $table->foreignId('variante_id')
                ->nullable()
                ->after('producto_id')
                ->constrained('product_variants')
                ->onDelete('cascade');
                
            // Índice para optimizar consultas por variante
            $table->index(['variante_id', 'fecha_transferencia']);
        });
    }

    /**
     * Reverse the migrations.
     */
    public function down(): void
    {
        Schema::table('transferencias_bodega', function (Blueprint $table) {
            $table->dropForeign(['variante_id']);
            $table->dropIndex(['variante_id', 'fecha_transferencia']);
            $table->dropColumn('variante_id');
        });
    }
};
