<?php
session_start();
require_once('../db.php');

if (isset($_SESSION['admin_logged_in'])) {
    header('Location: dashboard.php');
    exit();
}

$error = "";
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $user = $_POST['username'];
    $pass = $_POST['password'];

    $stmt = $conn->prepare("SELECT * FROM admins WHERE username = ?");
    $stmt->bind_param("s", $user);
    $stmt->execute();
    $result = $stmt->get_result();

    if ($result->num_rows > 0) {
        $admin = $result->fetch_assoc();
        if (password_verify($pass, $admin['password'])) {
            $_SESSION['admin_logged_in'] = true;
            $_SESSION['admin_id'] = $admin['id'];
            header('Location: dashboard.php');
            exit();
        } else {
            $error = "Invalid Password!";
        }
    } else {
        $error = "Invalid Username!";
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Admin Login | BS Public School</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        body { background: #f8f9fa; display: flex; align-items: center; justify-content: center; height: 100vh; }
        .login-card { width: 100%; max-width: 400px; padding: 30px; border-radius: 15px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); background: #fff; }
        .btn-primary { background: #198754; border: none; }
        .btn-primary:hover { background: #157347; }
    </style>
</head>
<body>
    <div class="login-card">
        <h3 class="text-center mb-4 fw-bold">Admin Login</h3>
        <?php if($error): ?>
            <div class="alert alert-danger"><?php echo $error; ?></div>
        <?php endif; ?>
        <form method="POST">
            <div class="mb-3">
                <label class="form-label">Username</label>
                <input type="text" name="username" class="form-control" required>
            </div>
            <div class="mb-3">
                <label class="form-label">Password</label>
                <input type="password" name="password" class="form-control" required>
            </div>
            <button type="submit" class="btn btn-primary w-100 py-2">Login</button>
        </form>
    </div>
</body>
</html>
