<?php
require_once __DIR__ . '/db/config.php';
require_once __DIR__ . '/includes/session.php';

$errors = [];
$success_message = '';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $name = trim($_POST['name'] ?? '');
    $email = trim($_POST['email'] ?? '');
    $password = $_POST['password'] ?? '';
    $password_confirm = $_POST['password_confirm'] ?? '';

    if (empty($name)) {
        $errors[] = 'Name is required.';
    }
    if (empty($email) || !filter_var($email, FILTER_VALIDATE_EMAIL)) {
        $errors[] = 'A valid email is required.';
    }
    if (empty($password)) {
        $errors[] = 'Password is required.';
    }
    if ($password !== $password_confirm) {
        $errors[] = 'Passwords do not match.';
    }

    if (empty($errors)) {
        $pdo = db();
        $stmt = $pdo->prepare("SELECT id FROM users WHERE email = ?");
        $stmt->execute([$email]);
        if ($stmt->fetch()) {
            $errors[] = 'Email already in use.';
        } else {
            $hashed_password = password_hash($password, PASSWORD_DEFAULT);
            $stmt = $pdo->prepare("INSERT INTO users (name, email, password) VALUES (?, ?, ?)");
            if ($stmt->execute([$name, $email, $hashed_password])) {
                $_SESSION['success_message'] = 'Registration successful! Please login.';
                header('Location: /index.php#loginModal');
                exit;
            } else {
                $errors[] = 'Something went wrong. Please try again.';
            }
        }
    }
    // To display errors, we would need to render a form here. 
    // For now, we redirect back to the form with errors in session.
    $_SESSION['register_errors'] = $errors;
    header('Location: /index.php#signupModal');
    exit;
}
// This script does not render HTML. It only processes the form.
header('Location: /index.php');
exit;