<?php
require_once __DIR__ . '/db/config.php';
session_start();

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

if (!isset($_SESSION['user_id'])) {
    echo json_encode(['success' => false, 'message' => 'You must be logged in to subscribe.']);
    exit;
}

$data = json_decode(file_get_contents('php://input'), true);
$location_id = $data['location_id'] ?? null;
$time = $data['time'] ?? null;

if (!$location_id || !$time) {
    echo json_encode(['success' => false, 'message' => 'Location and time are required.']);
    exit;
}

try {
    $pdo = db();
    $stmt = $pdo->prepare("INSERT INTO weather_subscriptions (user_id, location_id, delivery_time) VALUES (?, ?, ?)");
    $stmt->execute([$_SESSION['user_id'], $location_id, $time]);
    $subscription_id = $pdo->lastInsertId();

    echo json_encode(['success' => true, 'message' => 'Subscribed successfully!', 'subscription_id' => $subscription_id]);
} catch (PDOException $e) {
    if ($e->errorInfo[1] == 1062) { // Duplicate entry
        echo json_encode(['success' => false, 'message' => 'You are already subscribed to this location.']);
    } else {
        echo json_encode(['success' => false, 'message' => 'Database error: ' . $e->getMessage()]);
    }
}
?>