<?php
session_start();
// If user is already logged in, redirect to dashboard
if (isset($_SESSION['user'])) {
    header('Location: index.php');
    exit();
}
$error = $_SESSION['error'] ?? null;
unset($_SESSION['error']);
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login - Customer Master</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css" rel="stylesheet">
    <style>
        body {
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            background-color: #f8f9fa;
        }
        .login-card {
            width: 100%;
            max-width: 400px;
        }
    </style>
</head>
<body>
    <div class="card login-card shadow-sm">
        <div class="card-body p-5">
            <h1 class="card-title text-center mb-4">Customer Master</h1>
            <h5 class="card-subtitle mb-4 text-center text-muted">Please sign in</h5>
            
            <?php if ($error): ?>
                <div class="alert alert-danger" role="alert">
                    <i class="bi bi-exclamation-triangle-fill"></i> <?php echo htmlspecialchars($error); ?>
                </div>
            <?php endif; ?>

            <form action="auth.php" method="POST">
                <div class="mb-3">
                    <label for="username" class="form-label">Username</label>
                    <input type="text" class="form-control" id="username" name="username" required autofocus>
                </div>
                <div class="mb-4">
                    <label for="password" class="form-label">Password</label>
                    <input type="password" class="form-control" id="password" name="password" required>
                </div>
                <div class="d-grid">
                    <button type="submit" class="btn btn-primary">Sign in</button>
                </div>
            </form>
        </div>
        <div class="card-footer text-center text-muted py-3">
            <small>&copy; <?php echo date("Y"); ?> <?php echo htmlspecialchars($_SERVER['PROJECT_NAME'] ?? 'Flatlogic'); ?></small>
        </div>
    </div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
</body>
</html>
