<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreateStudentAssessmentTables extends Migration
{
    public function up()
    {
        if (! $this->db->tableExists('question_pools')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'name' => ['type' => 'VARCHAR', 'constraint' => 150],
                'subject_tag' => ['type' => 'VARCHAR', 'constraint' => 100, 'null' => true],
                'created_by' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'null' => true],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
                'updated_at' => ['type' => 'DATETIME', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addKey('subject_tag');
            $this->forge->createTable('question_pools', true);
        }

        if (! $this->db->tableExists('assessment_questions')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'pool_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'type' => ['type' => 'ENUM', 'constraint' => ['multiple_choice', 'short_answer', 'true_false', 'essay']],
                'text' => ['type' => 'TEXT'],
                'options' => ['type' => 'TEXT', 'null' => true],
                'correct_answer' => ['type' => 'TEXT', 'null' => true],
                'points' => ['type' => 'DECIMAL', 'constraint' => '8,2', 'default' => 0],
                'order_index' => ['type' => 'INT', 'constraint' => 11, 'default' => 0],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
                'updated_at' => ['type' => 'DATETIME', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addKey(['pool_id', 'order_index']);
            $this->forge->addForeignKey('pool_id', 'question_pools', 'id', 'CASCADE', 'CASCADE');
            $this->forge->createTable('assessment_questions', true);
        }

        if (! $this->db->tableExists('assessment_forms')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'name' => ['type' => 'VARCHAR', 'constraint' => 150],
                'pool_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'created_by' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'null' => true],
                'status' => ['type' => 'ENUM', 'constraint' => ['draft', 'published', 'archived'], 'default' => 'draft'],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
                'updated_at' => ['type' => 'DATETIME', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addKey(['pool_id', 'status']);
            $this->forge->addForeignKey('pool_id', 'question_pools', 'id', 'RESTRICT', 'CASCADE');
            $this->forge->createTable('assessment_forms', true);
        }

        if (! $this->db->tableExists('assessment_form_questions')) {
            $this->forge->addField([
                'form_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'question_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'order_index' => ['type' => 'INT', 'constraint' => 11, 'default' => 0],
            ]);
            $this->forge->addKey(['form_id', 'question_id'], true);
            $this->forge->addKey(['form_id', 'order_index']);
            $this->forge->addForeignKey('form_id', 'assessment_forms', 'id', 'CASCADE', 'CASCADE');
            $this->forge->addForeignKey('question_id', 'assessment_questions', 'id', 'RESTRICT', 'CASCADE');
            $this->forge->createTable('assessment_form_questions', true);
        }

        if (! $this->db->tableExists('student_assessments')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'form_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'student_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'status' => ['type' => 'ENUM', 'constraint' => ['not_started', 'in_progress', 'completed', 'graded'], 'default' => 'not_started'],
                'assigned_at' => ['type' => 'DATETIME', 'null' => true],
                'started_at' => ['type' => 'DATETIME', 'null' => true],
                'submitted_at' => ['type' => 'DATETIME', 'null' => true],
                'graded_at' => ['type' => 'DATETIME', 'null' => true],
                'graded_by' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'null' => true],
                'score' => ['type' => 'DECIMAL', 'constraint' => '10,2', 'null' => true],
                'education_committee_note' => ['type' => 'TEXT', 'null' => true],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
                'updated_at' => ['type' => 'DATETIME', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addUniqueKey(['form_id', 'student_id'], 'uq_assessment_form_student');
            $this->forge->addKey(['student_id', 'status']);
            $this->forge->addForeignKey('form_id', 'assessment_forms', 'id', 'RESTRICT', 'CASCADE');
            $this->forge->addForeignKey('student_id', 'students', 'id', 'CASCADE', 'CASCADE');
            $this->forge->createTable('student_assessments', true);
        }

        if (! $this->db->tableExists('student_answers')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'student_assessment_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'question_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'answer_value' => ['type' => 'TEXT', 'null' => true],
                'is_correct' => ['type' => 'TINYINT', 'constraint' => 1, 'null' => true],
                'points_awarded' => ['type' => 'DECIMAL', 'constraint' => '8,2', 'null' => true],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
                'updated_at' => ['type' => 'DATETIME', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addUniqueKey(['student_assessment_id', 'question_id'], 'uq_student_answer_question');
            $this->forge->addForeignKey('student_assessment_id', 'student_assessments', 'id', 'CASCADE', 'CASCADE');
            $this->forge->addForeignKey('question_id', 'assessment_questions', 'id', 'RESTRICT', 'CASCADE');
            $this->forge->createTable('student_answers', true);
        }
    }

    public function down()
    {
        foreach (['student_answers', 'student_assessments', 'assessment_form_questions', 'assessment_forms', 'assessment_questions', 'question_pools'] as $table) {
            $this->forge->dropTable($table, true);
        }
    }
}