<?php

function load_env($path)
{
    $vars = [];
    if (!file_exists($path)) {
        return $vars;
    }

    $lines = file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    foreach ($lines as $line) {
        if (strpos(trim($line), '#') === 0) {
            continue;
        }

        list($name, $value) = explode('=', $line, 2);
        $name = trim($name);
        $value = trim($value);

        $vars[$name] = $value;
    }
    return $vars;
}

function login(string $username, string $password): bool
{
    $pdo = db();
    $stmt = $pdo->prepare("SELECT * FROM users WHERE username = ?");
    $stmt->execute([$username]);
    $user = $stmt->fetch();

    if ($user && password_verify($password, $user['password'])) {
        $_SESSION['user_id'] = $user['id'];
        return true;
    }

    return false;
}

function logout(): void
{
    $_SESSION = [];
    session_destroy();
}

function is_logged_in(): bool
{
    return isset($_SESSION['user_id']);
}

function require_login(): void
{
    if (!is_logged_in()) {
        header('Location: /admin/login.php');
        exit;
    }
}

function register(string $name, string $username, string $email, string $password): int|false
{
    $pdo = db();
    $hashed_password = password_hash($password, PASSWORD_DEFAULT);

    $stmt = $pdo->prepare("INSERT INTO users (name, username, email, password) VALUES (?, ?, ?, ?)");
    try {
        $stmt->execute([$name, $username, $email, $hashed_password]);
        return (int)$pdo->lastInsertId();
    } catch (PDOException $e) {
        // 1062 is the error code for duplicate entry
        if ($e->errorInfo[1] == 1062) {
            return false;
        }
        throw $e;
    }
}