package com.baiyue.eventbridge.service;

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

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

@Component
public class HttpFinanceEventClient implements FinanceEventClient {
    @Resource private ObjectMapper objectMapper;
    @Resource private EventDispatcherProperties properties;
    @Resource private EventBridgeHttpTracePropagation tracePropagation;
    @Value("${baiyue.event-dispatcher.finance-consumer-url:http://127.0.0.1:9203/internal/finance/v1/business-fee-source-events}")
    private URI consumerUrl;
    @Value("${baiyue.event-dispatcher.finance-wallet-consumer-url:http://127.0.0.1:9203/internal/finance/v1/wallet-command-events}")
    private URI walletConsumerUrl;
    @Value("${baiyue.security.internal-service-token:}") private String serviceToken;
    private HttpClient httpClient;

    @PostConstruct
    void initializeHttpClient() {
        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());
        URI target = EventTypes.WALLET_COMMAND_REQUESTED.equals(row.getEventType())
            ? walletConsumerUrl : consumerUrl;
        HttpRequest request = tracePropagation.apply(HttpRequest.newBuilder(target)
                .timeout(properties.requestTimeout()).header("Content-Type", "application/json")
                .header("X-Internal-Service-Token", serviceToken))
            .POST(HttpRequest.BodyPublishers.ofString(objectMapper.writeValueAsString(envelope))).build();
        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
        JsonNode body;
        try { body = objectMapper.readTree(response.body()); }
        catch (Exception ignored) { body = null; }
        if (response.statusCode() / 100 != 2 || body == null || !"200".equals(body.path("code").asText())) {
            throw new IllegalStateException("Finance消费失败: HTTP " + response.statusCode()
                + ", code=" + (body == null ? "missing" : body.path("code").asText("missing")));
        }
        return String.valueOf(response.statusCode());
    }
}