package com.baiyue.eventbridge.service;

import com.baiyue.common.event.EventEnvelope;
import com.baiyue.common.event.RegionCode;
import com.baiyue.eventbridge.config.EventDispatcherProperties;
import com.baiyue.eventbridge.domain.BridgeInbox;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import jakarta.annotation.PostConstruct;
import jakarta.annotation.Resource;

import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

@Component
public class HttpLastlegEventClient implements LastlegEventClient {
    @Resource private ObjectMapper objectMapper;
    @Resource private EventDispatcherProperties properties;

    @Value("${baiyue.security.internal-service-token:}")
    private String serviceToken;

    private HttpClient httpClient;

    @PostConstruct
    void initializeHttpClient() {
        this.httpClient = HttpClient.newBuilder().connectTimeout(properties.connectTimeout()).build();
    }

    @Override
    public String deliver(BridgeInbox row) throws Exception {
        EventEnvelope envelope = new EventEnvelope(row.getEventId(), row.getEventType(), row.getEventVersion(),
                row.getOccurredAt(), RegionCode.valueOf(row.getSourceRegion()), RegionCode.valueOf(row.getTargetRegion()),
                row.getCustomerId(), row.getAggregateType(), row.getAggregateId(), row.getAggregateVersion(),
                row.getHandoverVersion(), row.getTraceId(), row.getCorrelationId(), row.getCausationId(),
                objectMapper.readTree(row.getPayloadJson()), row.getPayloadHash());
        String body = objectMapper.writeValueAsString(envelope);
        HttpRequest request = HttpRequest.newBuilder(properties.consumerUrl())
                .timeout(properties.requestTimeout())
                .header("Content-Type", "application/json")
                .header("X-Internal-Service-Token", serviceToken)
                .POST(HttpRequest.BodyPublishers.ofString(body))
                .build();
        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
        JsonNode responseBody = objectMapper.readTree(response.body());
        if (response.statusCode() / 100 != 2 || responseBody == null
                || !"200".equals(responseBody.path("code").asText())) {
            throw new IllegalStateException("尾程消费失败: HTTP " + response.statusCode());
        }
        return String.valueOf(response.statusCode());
    }
}