package com.xuqm.update.service;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.http.*;
import org.springframework.stereotype.Service;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.time.Duration;
import java.util.LinkedHashMap;
import java.util.Map;

@Service
public class ConnectivityValidationService {

    private final HttpClient httpClient = HttpClient.newBuilder()
            .connectTimeout(Duration.ofSeconds(5))
            .build();
    private final ObjectMapper objectMapper = new ObjectMapper();

    public void validateCallbackUrl(String url, String label) {
        if (url == null || url.isBlank()) {
            return;
        }
        try {
            Map<String, Object> body = new LinkedHashMap<>();
            body.put("probe", true);
            body.put("label", label);
            body.put("timestamp", System.currentTimeMillis());
            String payload = objectMapper.writeValueAsString(body);
            HttpRequest request = HttpRequest.newBuilder()
                    .uri(URI.create(url))
                    .timeout(Duration.ofSeconds(5))
                    .header("Content-Type", "application/json")
                    .header("X-Xuqm-Connectivity-Check", "true")
                    .POST(HttpRequest.BodyPublishers.ofString(payload))
                    .build();
            HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
            int status = response.statusCode();
            if (status < 200 || status >= 400) {
                throw new IllegalStateException("connectivity check failed with HTTP " + status);
            }
        } catch (Exception e) {
            throw new IllegalArgumentException("cannot connect to " + label + ": " + url, e);
        }
    }
}