<?php

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

class AddCascadeOnTags extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        if (DB::getDriverName() !== 'sqlite') {
            Schema::table('posts_tags', function (Blueprint $table) {
                $table->dropForeign('post_id');
                $table->foreign('post_id')->references('id')->on('posts')->onDelete('cascade')->onUpdate('cascade');
                $table->dropForeign('tag_id');
                $table->foreign('tag_id')->references('id')->on('tags')->onDelete('cascade')->onUpdate('cascade');
            });
        } else {
            // SQLite doesn't support drop foreign key
            Schema::rename('posts_tags', 'post_tags_bu');
            Schema::create('posts_tags', function (Blueprint $table) {
                $table->bigIncrements('id');
                $table->timestamps();
                $table->bigInteger('post_id');
                $table->bigInteger('tag_id');
                $table->foreign('post_id')->references('id')->on('posts')->onDelete('cascade')->onUpdate('cascade');
                $table->foreign('tag_id')->references('id')->on('tags')->onDelete('cascade')->onUpdate('cascade');
            });
            DB::insert('insert into posts_tags (id, post_id, tag_id, created_at, updated_at)
            select id, post_id, tag_id, created_at, updated_at from post_tags_bu');
            Schema::drop('post_tags_bu');
        }
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        if (DB::getDriverName() !== 'sqlite') {
            Schema::table('posts_tags', function (Blueprint $table) {
                $table->dropForeign('post_id');
                $table->foreign('post_id')->references('id')->on('posts');
                $table->dropForeign('tag_id');
                $table->foreign('tag_id')->references('id')->on('tags');
            });
        } else {
            // SQLite doesn't support drop foreign key
            Schema::rename('posts_tags', 'post_tags_bu');
            Schema::create('posts_tags', function (Blueprint $table) {
                $table->bigIncrements('id');
                $table->timestamps();
                $table->bigInteger('post_id');
                $table->bigInteger('tag_id');
                $table->foreign('post_id')->references('id')->on('posts');
                $table->foreign('tag_id')->references('id')->on('tags');
            });
            DB::insert('insert into posts_tags (id, post_id, tag_id, created_at, updated_at)
            select id, post_id, tag_id, created_at, updated_at from post_tags_bu');
            Schema::drop('post_tags_bu');
        }
    }
}