<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class AddFirstNameLastNameToUsers extends Migration
{
    public function up(): void
    {
        if (! $this->db->fieldExists('first_name', 'users')) {
            $this->forge->addColumn('users', [
                'first_name' => [
                    'type'       => 'VARCHAR',
                    'constraint' => 50,
                    'null'       => true,
                ],
            ]);
        }

        if (! $this->db->fieldExists('last_name', 'users')) {
            $this->forge->addColumn('users', [
                'last_name' => [
                    'type'       => 'VARCHAR',
                    'constraint' => 50,
                    'null'       => true,
                ],
            ]);
        }

        if ($this->db->fieldExists('name', 'users')) {
            $this->db->query("
                UPDATE users 
                SET 
                    first_name = CASE 
                        WHEN LOCATE(' ', name) > 0 THEN SUBSTRING_INDEX(name, ' ', 1)
                        ELSE name
                    END,
                    last_name = CASE 
                        WHEN LOCATE(' ', name) > 0 THEN SUBSTRING_INDEX(name, ' ', -1)
                        ELSE NULL
                    END
                WHERE first_name IS NULL AND name IS NOT NULL
            ");
        }
    }

    public function down(): void
    {
        if ($this->db->fieldExists('first_name', 'users')) {
            $this->forge->dropColumn('users', 'first_name');
        }

        if ($this->db->fieldExists('last_name', 'users')) {
            $this->forge->dropColumn('users', 'last_name');
        }
    }
}