<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreateTeacherSubjectsTable extends Migration
{
    public function up()
    {
        $this->forge->addField([
            'id' => [
                'type'           => 'INT',
                'constraint'     => 11,
                'unsigned'       => true,
                'auto_increment' => true,
            ],
            'teacher_user_id' => [
                'type'       => 'INT',
                'constraint' => 11,
                'unsigned'   => true,
            ],
            'subject_id' => [
                'type'       => 'INT',
                'constraint' => 11,
                'unsigned'   => true,
            ],
            'created_at' => [
                'type' => 'DATETIME',
                'null' => true,
            ],
            'updated_at' => [
                'type' => 'DATETIME',
                'null' => true,
            ],
        ]);

        $this->forge->addKey('id', true);
        $this->forge->addUniqueKey(['teacher_user_id', 'subject_id'], 'teacher_subjects_unique');
        $this->forge->addForeignKey('teacher_user_id', 'users', 'id', 'CASCADE', 'CASCADE', 'teacher_subjects_teacher_fk');
        $this->forge->addForeignKey('subject_id', 'subjects', 'id', 'CASCADE', 'CASCADE', 'teacher_subjects_subject_fk');
        $this->forge->createTable('teacher_subjects');
    }

    public function down()
    {
        $this->forge->dropForeignKey('teacher_subjects', 'teacher_subjects_teacher_fk');
        $this->forge->dropForeignKey('teacher_subjects', 'teacher_subjects_subject_fk');
        $this->forge->dropTable('teacher_subjects');
    }
}