<?php
// save_subscription.php
// This file saves subscription emails to a text file

// Set headers for JSON response
header('Content-Type: application/json');

// Enable CORS if needed (remove if not required)
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: POST');

// Only allow POST requests
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    echo json_encode(['success' => false, 'message' => 'Invalid request method']);
    exit;
}

// Get the email from POST data
$email = isset($_POST['email']) ? trim($_POST['email']) : '';

// Validate email
if (empty($email)) {
    echo json_encode(['success' => false, 'message' => 'Email is required']);
    exit;
}

if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo json_encode(['success' => false, 'message' => 'Invalid email format']);
    exit;
}

// File to store emails
$filename = 'subscriptions.txt';

// Check if email already exists
if (file_exists($filename)) {
    $existingEmails = file($filename, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    if (in_array($email, $existingEmails)) {
        echo json_encode(['success' => false, 'message' => 'This email is already subscribed']);
        exit;
    }
}

// Prepare data to save (email with timestamp)
$timestamp = date('Y-m-d H:i:s');
$data = $email . ' | ' . $timestamp . PHP_EOL;

// Save to file
if (file_put_contents($filename, $data, FILE_APPEND | LOCK_EX) !== false) {
    echo json_encode([
        'success' => true, 
        'message' => 'Subscription successful!'
    ]);
} else {
    echo json_encode([
        'success' => false, 
        'message' => 'Failed to save subscription. Please check file permissions.'
    ]);
}
?>