package com.baiyue.common.web;

import com.baiyue.common.core.api.ApiResponse;
import com.fasterxml.jackson.core.JsonProcessingException;
import feign.FeignException;
import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Set;

/** Explicit failure classification and bounded, credential-free delivery diagnostics. */
public class EventDeliveryFailure extends IllegalStateException {
    private static final Set<String> PERMANENT_CODES = Set.of("A0401", "A0403", "EVT_PROTOCOL");
    private final boolean permanent;
    public EventDeliveryFailure(boolean permanent, String message) {
        super(message);
        this.permanent = permanent;
    }
    public static void requireSuccessful(ApiResponse<?> response) {
        requireSuccessful(response, Set.of());
    }
    public static void requireSuccessful(ApiResponse<?> response, Set<String> additionalPermanentCodes) {
        if (response == null) throw new EventDeliveryFailure(false, "Consumer returned an empty response");
        if (!response.successful()) {
            throw new EventDeliveryFailure(response.code() != null && (PERMANENT_CODES.contains(response.code()) || additionalPermanentCodes.contains(response.code())),
                "Consumer rejected event: code=" + response.code() + ", message=" + response.message()
                    + ", requestId=" + response.requestId() + ", traceId=" + response.traceId());
        }
        if (response.data() == null) throw new EventDeliveryFailure(false, "Consumer ACK is missing");
    }
    public static boolean isPermanent(Throwable failure) {
        Set<Throwable> seen = Collections.newSetFromMap(new IdentityHashMap<>());
        for (Throwable current = failure; current != null && seen.add(current); current = current.getCause()) {
            if (current instanceof EventDeliveryFailure delivery && delivery.permanent) return true;
            if (current instanceof FeignException http && (http.status() == 401 || http.status() == 403)) return true;
        }
        return false;
    }
    public static String diagnostic(Throwable failure, String internalToken) {
        Throwable current = failure;
        Set<Throwable> seen = Collections.newSetFromMap(new IdentityHashMap<>());
        while (current.getCause() != null && seen.add(current)
                && ("NoFallbackAvailableException".equals(current.getClass().getSimpleName())
                    || "No fallback available.".equals(current.getMessage()))) current = current.getCause();
        String message;
        if (current instanceof feign.codec.DecodeException) message = "Invalid consumer response contract";
        else if (current instanceof FeignException http) message = "HTTP " + http.status();
        else if (current instanceof JsonProcessingException) message = "Invalid event JSON";
        else message = current.getMessage() == null ? "unknown" : current.getMessage();
        String text = current.getClass().getSimpleName() + ": " + message;
        if (internalToken != null && !internalToken.isBlank()) text = text.replace(internalToken, "***");
        text = text.replaceAll("(?i)Bearer\\s+[^\\s,;\\\"']+", "Bearer ***")
            .replaceAll("(?i)((?:X-Internal-Service-Token|Authorization|access[_-]?token|refresh[_-]?token)\\s*[=:]\\s*)[^\\s,;]+", "$1***")
            .replaceAll("[\\r\\n\\t]+", " ");
        return text.length() > 500 ? text.substring(0, 500) : text;
    }
}