<?php
header('Access-Control-Allow-Origin: *');     
header('Access-Control-Allow-Methods: POST, GET, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type, Authorization');
header('Access-Control-Max-Age: 86400');          
header('Content-Type: application/json');        

if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit();
}

session_start();             
include 'Connection.php';    

$input = json_decode(file_get_contents('php://input'), true);
$username = $input['username'] ?? '';
$password = $input['password'] ?? '';

$stmt = $conn->prepare("SELECT id, password FROM users WHERE username = ?");                          
$stmt->bind_param("s", $username);
$stmt->execute();                 
$stmt->store_result();           

if ($stmt->num_rows === 0) {
    echo json_encode([
        "success" => false,
        "message" => "Username Not Found"
    ]);
    $stmt->close();
    $conn->close();
    exit;
}

$stmt->bind_result($userId, $hashedPassword);
$stmt->fetch();

if (password_verify($password, $hashedPassword)) {

    $_SESSION['user_id'] = $userId;
    $_SESSION['username'] = $username;

    echo json_encode([
        "success" => true,
        "message" => "Login successful",
        "username" => $username,
        "token" => bin2hex(random_bytes(32))
    ]);

} else {

    echo json_encode([
        "success" => false,
        "message" => "Incorrect password"
    ]);
}

$stmt->close();
$conn->close(); 
?>