<?php
declare(strict_types=1);

header('Content-Type: application/json; charset=utf-8');
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');

require_once __DIR__ . '/../db/visit_counter.php';

$method = $_SERVER['REQUEST_METHOD'] ?? 'GET';

try {
    if ($method === 'POST') {
        $rawBody = file_get_contents('php://input');
        $payload = json_decode(is_string($rawBody) ? $rawBody : '', true);
        if (!is_array($payload)) {
            $payload = $_POST;
        }

        $action = is_string($payload['action'] ?? null) ? $payload['action'] : 'ping';
        $token = is_string($payload['token'] ?? null) ? $payload['token'] : null;

        if ($action === 'forget') {
            echo json_encode([
                'success' => true,
                'counts' => visit_counter_forget($token),
            ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
            exit;
        }

        $tracked = visit_counter_track($token);
        echo json_encode([
            'success' => true,
            'token' => $tracked['token'],
            'counts' => $tracked['counts'],
        ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
        exit;
    }

    echo json_encode([
        'success' => true,
        'counts' => visit_counter_snapshot(),
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
} catch (Throwable $exception) {
    http_response_code(500);
    echo json_encode([
        'success' => false,
        'error' => 'visit_counter_unavailable',
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
}