<?php
$databaseFile = '../mydatabase.db';

try {
    $db = new PDO("sqlite:" . $databaseFile);
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

    // Check if the User table exists
    $result = $db->query("SELECT name FROM sqlite_master WHERE type='table' AND name='User'");
    $userTableExists = $result->fetchColumn();

    if (!$userTableExists) {
        // Initialize the database structure
        $db->exec("
            CREATE TABLE User (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                vorname TEXT NOT NULL,
                nachname TEXT NOT NULL,
                username TEXT UNIQUE NOT NULL,
                password TEXT NOT NULL,
                active BOOLEAN DEFAULT 0
            )
        ");

        $db->exec("
            CREATE TABLE Restaurant (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                name TEXT NOT NULL,
                maps_link TEXT
            )
        ");

        $db->exec("
            CREATE TABLE Bewertung (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                fk_user_id INTEGER NOT NULL,
                fk_restaurant_id INTEGER NOT NULL,
                bewertung INTEGER NOT NULL CHECK (bewertung BETWEEN 0 AND 10),
                bewertung_str TEXT,
                FOREIGN KEY (fk_user_id) REFERENCES User(id),
                FOREIGN KEY (fk_restaurant_id) REFERENCES Restaurant(id)
            )
        ");

        echo "<p style='color:green;'>Database structure created.</p>";

        // Check if any users exist
        $checkUserStmt = $db->query("SELECT COUNT(*) FROM User");
        $userCount = $checkUserStmt->fetchColumn();

        if ($userCount == 0) {
            // Create an initial admin account
            $adminVorname = 'Admin';
            $adminNachname = 'User';
            $adminUsername = 'admin';
            $adminPassword = 'admin123'; // IMPORTANT: Change this default password!
            $hashedPassword = password_hash($adminPassword, PASSWORD_DEFAULT);
            $adminActive = 2; // Let's use 2 to denote an admin user

            $insertAdminStmt = $db->prepare("
                INSERT INTO User (vorname, nachname, username, password, active)
                VALUES (:vorname, :nachname, :username, :password, :active)
            ");
            $insertAdminStmt->bindParam(':vorname', $adminVorname);
            $insertAdminStmt->bindParam(':nachname', $adminNachname);
            $insertAdminStmt->bindParam(':username', $adminUsername);
            $insertAdminStmt->bindParam(':password', $hashedPassword);
            $insertAdminStmt->bindParam(':active', $adminActive, PDO::PARAM_INT);

            if ($insertAdminStmt->execute()) {
                echo "<p style='color:green;'>Initial admin account created: Username='admin', Password='admin123' (Please change immediately!).</p>";
            } else {
                echo "<p style='color:red;'>Error creating initial admin account: " . print_r($insertAdminStmt->errorInfo(), true) . "</p>";
            }
        }

    } else {
        //  echo "<p style='color:blue;'>Database already exists.</p>";
    }

} catch (PDOException $e) {
    die("Database connection failed: " . $e->getMessage());
}

function sanitize_input($data) {
    $data = trim($data);
    $data = stripslashes($data);
    $data = htmlspecialchars($data);
    return $data;
}
?>