<?php
declare(strict_types=1);

require_once __DIR__ . '/../config.php';

$pdo = db();

$tableStmt = $pdo->prepare(
    'SELECT 1 FROM information_schema.TABLES WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :table LIMIT 1'
);
$tableStmt->execute(['table' => 'invoices']);

if ((bool)$tableStmt->fetchColumn()) {
    $columnStmt = $pdo->prepare(
        'SELECT 1 FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = :table AND COLUMN_NAME = :column LIMIT 1'
    );
    $columnStmt->execute([
        'table' => 'invoices',
        'column' => 'due_date',
    ]);

    if (!(bool)$columnStmt->fetchColumn()) {
        $pdo->exec('ALTER TABLE `invoices` ADD COLUMN `due_date` DATE DEFAULT NULL AFTER `invoice_date`');
    }
}

return true;