<?php

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

class CreateDataTablesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('data_tables', function (Blueprint $table) {
            $table->increments('id');
            $table->timestamps();
            $table->unsignedInteger('owner_id');
            $table->unsignedInteger('precursor_id')->nullable(); // fork source
            $table->unsignedInteger('revision'); // incremented with each applied changeset
            $table->string('title')->index(); // indexable
            $table->text('description');
            $table->text('license');
            $table->text('source_link');

            $table->foreign('owner_id')->references('id')->on('users')
                ->onDelete('cascade');

            $table->foreign('parent_table_id')->references('id')->on('data_tables')
                ->onDelete('set null');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('data_tables');
    }
}