package com.baiyue.common.web;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.baiyue.common.event.EventIdentifiers;
import feign.FeignException;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Set;

/** Diagnostic identity and finite audit error codes; never serialize exception messages or payloads. */
public final class EventDeliveryObservation {
    private EventDeliveryObservation() { }
    public static String eventId(ObjectMapper mapper, String json) {
        try {
            String id = mapper.readTree(json).path("eventId").asText("");
            return EventIdentifiers.isSupported(id) ? id : null;
        } catch (Exception invalid) { return null; } // Invalid payloads are still audited by Outbox entry ID.
    }
    public static String errorCode(Throwable error, boolean permanent, boolean requestStarted) {
        Set<Throwable> seen = Collections.newSetFromMap(new IdentityHashMap<>());
        for (Throwable cause = error; cause != null && seen.add(cause); cause = cause.getCause()) {
            if (cause instanceof feign.codec.DecodeException) return "INVALID_RESPONSE";
            if (cause instanceof FeignException http && http.status() >= 100 && http.status() <= 599) {
                return "HTTP_" + http.status();
            }
        }
        if (!requestStarted) return "INVALID_EVENT";
        return permanent ? "PERMANENT_FAILURE" : "DELIVERY_FAILURE";
    }
}