<?php
header('Content-Type: application/json');
require_once __DIR__ . '/auth_helper.php';

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

if (empty($email) || empty($password)) {
    echo json_encode(['success' => false, 'error' => 'Email and password are required.']);
    exit;
}

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo json_encode(['success' => false, 'error' => 'Invalid email format.']);
    exit;
}

try {
    $pdo = db();
    
    // Check if user already exists
    $stmt = $pdo->prepare("SELECT id FROM users WHERE email = ?");
    $stmt->execute([$email]);
    if ($stmt->fetch()) {
        echo json_encode(['success' => false, 'error' => 'Email already registered.']);
        exit;
    }

    $password_hash = password_hash($password, PASSWORD_DEFAULT);
    $stmt = $pdo->prepare("INSERT INTO users (email, password_hash) VALUES (?, ?)");
    $stmt->execute([$email, $password_hash]);
    
    $user_id = $pdo->lastInsertId();
    login_user($user_id);

    echo json_encode(['success' => true]);
} catch (PDOException $e) {
    echo json_encode(['success' => false, 'error' => 'Database error: ' . $e->getMessage()]);
}