<?php
declare(strict_types=1);
require_once __DIR__ . '/db/config.php';

header('Content-Type: application/json');

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_encode(['success' => false, 'message' => 'Invalid request method.']);
    exit;
}

$email = filter_var($_POST['email'] ?? '', FILTER_VALIDATE_EMAIL);

if (!$email) {
    echo json_encode(['success' => false, 'message' => 'Please provide a valid email address.']);
    exit;
}

try {
    $stmt = db()->prepare("INSERT INTO subscriptions (email) VALUES (?)");
    $stmt->execute([$email]);
    echo json_encode(['success' => true, 'message' => 'Subscription successful. Thank you!']);
} catch (PDOException $e) {
    if ($e->getCode() === '23000') {
        echo json_encode(['success' => true, 'message' => 'You are already subscribed.']);
    } else {
        error_log($e->getMessage());
        echo json_encode(['success' => false, 'message' => 'A server error occurred. Please try again later.']);
    }
}