<?php
// Exceptions PHP-MYSQLI
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

// Check if first_start.php installer file exists and database setup is needed
$first_start_path = ROOT_DIR . "first_start.php";
if (file_exists($first_start_path) && basename($_SERVER['SCRIPT_FILENAME'] ?? '') !== 'first_start.php') {
    // Check connection first
    try {
        $test_conn = @new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);
        if ($test_conn->connect_error) {
            header("Location: first_start.php");
            exit;
        }
        $test_conn->close();
    } catch (Exception $ex) {
        header("Location: first_start.php");
        exit;
    }
}

try {
    // Create Connection to MySQL host first (in case DB doesn't exist yet)
    $conn = new mysqli(DB_HOST, DB_USER, DB_PASS);
    
    // Create Database if not exists
    $db_name_escaped = str_replace('`', '``', DB_NAME);
    $conn->query("CREATE DATABASE IF NOT EXISTS `$db_name_escaped` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci");
    $conn->select_db(DB_NAME);

    // Ensure BLOCKNOTES_FOLD directory exists
    if (!is_dir(BLOCKNOTES_FOLD)) {
        @mkdir(BLOCKNOTES_FOLD, 0777, true);
    }

    // Auto-create users table if missing (with ENUM containing 'owner')
    $sql_table = "CREATE TABLE IF NOT EXISTS users (
        id INT AUTO_INCREMENT PRIMARY KEY,
        username VARCHAR(50) NOT NULL UNIQUE,
        password VARCHAR(255) NOT NULL,
        role ENUM('owner', 'admin', 'user') NOT NULL DEFAULT 'user',
        theme_pri INT DEFAULT 98,
        theme_sec INT DEFAULT 207,
        theme_thi INT DEFAULT 280,
        language VARCHAR(5) NOT NULL DEFAULT 'it',
        default_blocknote VARCHAR(100) NOT NULL DEFAULT '',
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;";
    $conn->query($sql_table);

    // Auto-migrate role column ENUM if missing 'owner'
    $conn->query("ALTER TABLE users MODIFY COLUMN role ENUM('owner', 'admin', 'user') NOT NULL DEFAULT 'user'");

    // Auto-migrate columns if missing in existing table
    $check_lang = $conn->query("SHOW COLUMNS FROM users LIKE 'language'");
    if ($check_lang->num_rows === 0) {
        $conn->query("ALTER TABLE users ADD COLUMN language VARCHAR(5) NOT NULL DEFAULT 'it'");
    }

    $check_def_bn = $conn->query("SHOW COLUMNS FROM users LIKE 'default_blocknote'");
    if ($check_def_bn->num_rows === 0) {
        $conn->query("ALTER TABLE users ADD COLUMN default_blocknote VARCHAR(100) NOT NULL DEFAULT ''");
    }

    // Auto-create site_settings table
    $sql_settings = "CREATE TABLE IF NOT EXISTS site_settings (
        setting_key VARCHAR(50) PRIMARY KEY,
        setting_value TEXT
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;";
    $conn->query($sql_settings);

    // Seed default site settings if missing
    $conn->query("INSERT IGNORE INTO site_settings (setting_key, setting_value) VALUES ('site_title', 'Blocknotes')");
    $conn->query("INSERT IGNORE INTO site_settings (setting_key, setting_value) VALUES ('site_favicon', 'assets/img/favicon.png')");

    // Seed default owner account if table is empty or ensure admin user is owner if no owner exists
    $res = $conn->query("SELECT COUNT(*) AS total FROM users");
    $row = $res->fetch_assoc();
    if ((int)$row['total'] === 0) {
        $default_pass = password_hash("admin123", PASSWORD_DEFAULT);
        $admin_user = "admin";
        $stmt = $conn->prepare("INSERT INTO users (username, password, role) VALUES (?, ?, 'owner')");
        $stmt->bind_param("ss", $admin_user, $default_pass);
        $stmt->execute();
        $stmt->close();
    } else {
        // Check if an owner exists, if not, promote the first user to owner
        $check_owner = $conn->query("SELECT COUNT(*) AS total_owners FROM users WHERE role = 'owner'");
        $owner_row = $check_owner->fetch_assoc();
        if ((int)$owner_row['total_owners'] === 0) {
            $conn->query("UPDATE users SET role = 'owner' ORDER BY id ASC LIMIT 1");
        }
    }

} catch (mysqli_sql_exception $e) {
    if (file_exists($first_start_path) && basename($_SERVER['SCRIPT_FILENAME'] ?? '') !== 'first_start.php') {
        header("Location: first_start.php");
        exit;
    }
    include(PAGES_FOLD . "db-error.php");
    debugStatusMes("Database setup error: " . $e->getMessage(), "High");
    die();
}
?>