package com.xuqm.im.service;

import com.fasterxml.jackson.databind.JsonNode;
import com.xuqm.common.exception.BusinessException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestClientException;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

@Component
public class ImAppSecretClient {

    private final RestTemplate restTemplate = new RestTemplate();
    private final Map<String, String> cache = new ConcurrentHashMap<>();

    @Value("${im.tenant-service-url:http://192.168.116.9:8081}")
    private String tenantServiceUrl;

    @Value("${im.internal-token:xuqm-internal-token}")
    private String internalToken;

    public String getAppSecret(String appId) {
        return cache.computeIfAbsent(appId, this::fetchAppSecret);
    }

    private String fetchAppSecret(String appId) {
        String url = UriComponentsBuilder.fromHttpUrl(tenantServiceUrl)
                .path("/api/internal/sdk/apps/{appId}/secret")
                .buildAndExpand(appId)
                .toUriString();
        HttpHeaders headers = new HttpHeaders();
        headers.set("X-Internal-Token", internalToken);
        try {
            ResponseEntity<JsonNode> response = restTemplate.exchange(
                    url,
                    HttpMethod.GET,
                    new HttpEntity<>(headers),
                    JsonNode.class
            );
            JsonNode body = response.getBody();
            if (response.getStatusCode().is2xxSuccessful()
                    && body != null
                    && body.path("code").asInt() == 200) {
                return body.path("data").path("appSecret").asText(null);
            }
        } catch (RestClientException e) {
            throw new BusinessException(502, "Failed to resolve app secret: " + e.getMessage());
        }
        throw new BusinessException(502, "Failed to resolve app secret for appId: " + appId);
    }
}