<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class CreateEnrollmentPhaseTwoTables extends Migration
{
    public function up()
    {
        if ($this->db->tableExists('school_years')) {
            $schoolYearFields = [];
            $this->addColumnIfMissing($schoolYearFields, 'school_years', 'registration_opens_at', ['type' => 'DATETIME', 'null' => true, 'after' => 'registration_starts_on']);
            $this->addColumnIfMissing($schoolYearFields, 'school_years', 'registration_deadline_at', ['type' => 'DATETIME', 'null' => true, 'after' => 'registration_ends_on']);
            $this->addColumnIfMissing($schoolYearFields, 'school_years', 'late_registration_blocked', ['type' => 'TINYINT', 'constraint' => 1, 'default' => 1, 'after' => 'registration_deadline_at']);
            $this->addColumnIfMissing($schoolYearFields, 'school_years', 'administrative_exceptions_permitted', ['type' => 'TINYINT', 'constraint' => 1, 'default' => 1, 'after' => 'late_registration_blocked']);
            $this->addColumnIfMissing($schoolYearFields, 'school_years', 'registration_exception_roles', ['type' => 'TEXT', 'null' => true, 'after' => 'administrative_exceptions_permitted']);
            $this->addColumnIfMissing($schoolYearFields, 'school_years', 'adult_student_registration_enabled', ['type' => 'TINYINT', 'constraint' => 1, 'default' => 0, 'after' => 'registration_exception_roles']);
            if ($schoolYearFields !== []) {
                $this->forge->addColumn('school_years', $schoolYearFields);
            }
        }

        if (! $this->db->tableExists('enrollment_age_rules')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'school_year' => ['type' => 'VARCHAR', 'constraint' => 20],
                'campus' => ['type' => 'VARCHAR', 'constraint' => 100, 'null' => true],
                'grade_class_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'null' => true],
                'education_level' => ['type' => 'VARCHAR', 'constraint' => 80, 'null' => true],
                'minimum_age' => ['type' => 'INT', 'constraint' => 3, 'null' => true],
                'maximum_age' => ['type' => 'INT', 'constraint' => 3, 'null' => true],
                'age_reference_date' => ['type' => 'DATE', 'null' => true],
                'behavior' => ['type' => 'VARCHAR', 'constraint' => 20, 'default' => 'blocking'],
                'exceptions_allowed' => ['type' => 'TINYINT', 'constraint' => 1, 'default' => 0],
                'exception_roles' => ['type' => 'TEXT', 'null' => true],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
                'updated_at' => ['type' => 'DATETIME', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addKey(['school_year', 'grade_class_id']);
            $this->forge->createTable('enrollment_age_rules', true);
        }

        if (! $this->db->tableExists('enrollment_flags')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'flag_type' => ['type' => 'VARCHAR', 'constraint' => 80],
                'student_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'school_year' => ['type' => 'VARCHAR', 'constraint' => 20],
                'source_school_year' => ['type' => 'VARCHAR', 'constraint' => 20, 'null' => true],
                'status' => ['type' => 'VARCHAR', 'constraint' => 40, 'default' => 'open'],
                'priority' => ['type' => 'VARCHAR', 'constraint' => 20, 'default' => 'normal'],
                'assigned_to' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'null' => true],
                'details_json' => ['type' => 'TEXT', 'null' => true],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
                'resolved_at' => ['type' => 'DATETIME', 'null' => true],
                'resolution_notes' => ['type' => 'TEXT', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addKey(['student_id', 'school_year', 'flag_type']);
            $this->forge->createTable('enrollment_flags', true);
        }

        if (! $this->db->tableExists('enrollment_transition_audits')) {
            $this->forge->addField([
                'id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'auto_increment' => true],
                'student_id' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true],
                'school_year' => ['type' => 'VARCHAR', 'constraint' => 20],
                'source_school_year' => ['type' => 'VARCHAR', 'constraint' => 20, 'null' => true],
                'action' => ['type' => 'VARCHAR', 'constraint' => 80],
                'performed_by' => ['type' => 'INT', 'constraint' => 11, 'unsigned' => true, 'null' => true],
                'original_values_json' => ['type' => 'TEXT', 'null' => true],
                'new_values_json' => ['type' => 'TEXT', 'null' => true],
                'reason' => ['type' => 'TEXT', 'null' => true],
                'created_at' => ['type' => 'DATETIME', 'null' => true],
            ]);
            $this->forge->addKey('id', true);
            $this->forge->addKey(['student_id', 'school_year', 'created_at']);
            $this->forge->createTable('enrollment_transition_audits', true);
        }
    }

    public function down()
    {
        $this->forge->dropTable('enrollment_transition_audits', true);
        $this->forge->dropTable('enrollment_flags', true);
        $this->forge->dropTable('enrollment_age_rules', true);

        if (! $this->db->tableExists('school_years')) {
            return;
        }

        foreach ([
            'registration_opens_at',
            'registration_deadline_at',
            'late_registration_blocked',
            'administrative_exceptions_permitted',
            'registration_exception_roles',
            'adult_student_registration_enabled',
        ] as $field) {
            if ($this->db->fieldExists($field, 'school_years')) {
                $this->forge->dropColumn('school_years', $field);
            }
        }
    }

    private function addColumnIfMissing(array &$fields, string $table, string $name, array $definition): void
    {
        if (! $this->db->fieldExists($name, $table)) {
            $fields[$name] = $definition;
        }
    }
}