<?php

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

class UpdateMediaItemsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('media_items', function (Blueprint $table) {
            // Drop existing foreign key
            $table->dropForeign(['backend_user_id']);

            // Make the column nullable to support SET NULL
            $table->unsignedBigInteger('backend_user_id')->nullable()->change();

            // Add foreign key with SET NULL
            $table->foreign('backend_user_id')->references('id')
                ->on('backend_users')->onDelete('SET NULL')->onUpdate('CASCADE');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('media_items', function (Blueprint $table) {
            // Drop foreign key
            $table->dropForeign(['backend_user_id']);

            // Restore original foreign key
            $table->foreign('backend_user_id')->references('id')
                ->on('backend_users')->onDelete('RESTRICT')->onUpdate('RESTRICT');

            // Restore column to NOT NULL
            // $table->unsignedBigInteger('backend_user_id')->nullable(false)->change();
        });
    }
}