<?php

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

class AddFieldsToBlocksTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('blocks', function (Blueprint $table) {
            $table->unsignedBigInteger('background_image_id')->nullable();
            $table->foreign('background_image_id')->references('id')
                ->on('media_items')->onDelete('SET NULL')->onUpdate('CASCADE');

            $table->string('chronologic_era', 5);
            $table->string('year', 4);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('blocks', function (Blueprint $table) {
            $table->dropForeign(['background_image_id']);
            $table->dropColumn([
                'background_image_id',
                'chronologic_era',
                'year',
            ]);
        });
    }
}