<?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 ($email === '' || $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;
}

$hashedPassword = password_hash($password, PASSWORD_DEFAULT);

try {
    $stmt = db()->prepare("INSERT INTO users (email, password_hash) VALUES (?, ?)");
    if ($stmt->execute([$email, $hashedPassword])) {
        $_SESSION['user_id'] = db()->lastInsertId();
        $_SESSION['email'] = $email;
        echo json_encode(['success' => true]);
    }
} catch (PDOException $e) {
    if ($e->getCode() == 23000) {
        echo json_encode(['success' => false, 'error' => 'Email is already registered.']);
    } else {
        echo json_encode(['success' => false, 'error' => 'Database error: ' . $e->getMessage()]);
    }
}