<?php

declare(strict_types=1);

require dirname(__DIR__) . '/vendor/autoload.php';

$dotenv = Dotenv\Dotenv::createImmutable(dirname(__DIR__));
$dotenv->safeLoad();

$dsn = sprintf(
    'mysql:host=%s;port=%s;dbname=%s;charset=%s',
    $_ENV['DB_HOST'] ?? '127.0.0.1',
    $_ENV['DB_PORT'] ?? '3306',
    $_ENV['DB_DATABASE'] ?? '',
    $_ENV['DB_CHARSET'] ?? 'utf8mb4'
);

$pdo = new PDO(
    $dsn,
    $_ENV['DB_USERNAME'] ?? '',
    $_ENV['DB_PASSWORD'] ?? '',
    [
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    ]
);

function hasColumn(PDO $pdo, string $table, string $column): bool
{
    $stmt = $pdo->prepare('SELECT COUNT(*) FROM information_schema.COLUMNS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ? AND COLUMN_NAME = ?');
    $stmt->execute([$table, $column]);
    return (int)$stmt->fetchColumn() > 0;
}

function hasIndex(PDO $pdo, string $table, string $index): bool
{
    $stmt = $pdo->prepare('SELECT COUNT(*) FROM information_schema.STATISTICS WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ? AND INDEX_NAME = ?');
    $stmt->execute([$table, $index]);
    return (int)$stmt->fetchColumn() > 0;
}

if (!hasColumn($pdo, 'orders', 'source_customer_id')) {
    $pdo->exec("ALTER TABLE orders ADD COLUMN source_customer_id VARCHAR(64) NOT NULL DEFAULT '' AFTER source_channel");
    echo "ADD_COLUMN orders.source_customer_id\n";
}

$pdo->exec("ALTER TABLE orders MODIFY COLUMN source_channel VARCHAR(32) NOT NULL DEFAULT 'mini_program'");

if (!hasIndex($pdo, 'orders', 'idx_orders_source_channel')) {
    $pdo->exec('ALTER TABLE orders ADD KEY idx_orders_source_channel (source_channel)');
    echo "ADD_INDEX orders.idx_orders_source_channel\n";
}

if (!hasIndex($pdo, 'orders', 'idx_orders_source_customer_id')) {
    $pdo->exec('ALTER TABLE orders ADD KEY idx_orders_source_customer_id (source_customer_id)');
    echo "ADD_INDEX orders.idx_orders_source_customer_id\n";
}

$pdo->exec("UPDATE orders SET source_channel = 'mini_program' WHERE source_channel = 'user_app'");

echo "SCHEMA_UPGRADE_OK\n";