<?php
require_once '../includes/db.php';
require_once '../includes/auth.php';

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

if (!isLoggedIn()) {
    echo json_encode(['success' => false, 'error' => 'Login required']);
    exit;
}

$comment_id = (int)($_POST['comment_id'] ?? 0);
$type = $_POST['type'] ?? '';

if (!$comment_id || !in_array($type, ['thumb', 'heart', 'pray', 'insight', 'clap'])) {
    echo json_encode(['success' => false, 'error' => 'Invalid data']);
    exit;
}

try {
    // Check if exists
    $stmt = $pdo->prepare("SELECT id FROM reactions WHERE comment_id = ? AND user_id = ? AND reaction_type = ?");
    $stmt->execute([$comment_id, $_SESSION['user_id'], $type]);
    $exists = $stmt->fetch();

    if ($exists) {
        $pdo->prepare("DELETE FROM reactions WHERE id = ?")->execute([$exists['id']]);
        $action = 'removed';
    } else {
        $pdo->prepare("INSERT INTO reactions (comment_id, user_id, reaction_type) VALUES (?, ?, ?)")->execute([$comment_id, $_SESSION['user_id'], $type]);
        $action = 'added';
    }

    // Get new count
    $stmt = $pdo->prepare("SELECT COUNT(*) FROM reactions WHERE comment_id = ? AND reaction_type = ?");
    $stmt->execute([$comment_id, $type]);
    $count = $stmt->fetchColumn();

    echo json_encode(['success' => true, 'action' => $action, 'count' => $count]);
} catch (Exception $e) {
    echo json_encode(['success' => false, 'error' => 'DB error']);
}
?>