<?php
require_once __DIR__ . '/../../db/config.php';

try {
    $pdo = db();

    // Check if table calendar_event_groups already exists
    $stmt = $pdo->query("SHOW TABLES LIKE 'calendar_event_groups'");
    $table_exists = $stmt->rowCount() > 0;

    if (!$table_exists) {
        $pdo->exec("
            CREATE TABLE `calendar_event_groups` (
                `id` INT AUTO_INCREMENT PRIMARY KEY,
                `calendar_event_id` INT NOT NULL,
                `bni_group_id` INT NOT NULL,
                FOREIGN KEY (`calendar_event_id`) REFERENCES `calendar_events`(`id`) ON DELETE CASCADE,
                FOREIGN KEY (`bni_group_id`) REFERENCES `bni_groups`(`id`) ON DELETE CASCADE,
                UNIQUE KEY `unique_event_group` (`calendar_event_id`, `bni_group_id`)
            )
        ");
        echo "Table 'calendar_event_groups' created successfully.\n";
    } else {
        echo "Table 'calendar_event_groups' already exists.\n";
    }

} catch (PDOException $e) {
    die("Migration failed: " . $e->getMessage() . "\n");
}