import { createHash } from "node:crypto";
import { isMediaInputFailure } from "@/lib/ai/runtime/request-failure-classification";

export const VIP98K_REFERENCE_STAGING_KEY_PREFIX = "uploads/vip98k-";
const VIP98K_REFERENCE_CACHE_OBJECT_PREFIX = "uploads/vip98k-cache";

function parseUrl(value: string) {
  try {
    return new URL(String(value || "").trim());
  } catch {
    return null;
  }
}

export function isVip98kStagedReferenceUrl(value: string) {
  const parsed = parseUrl(value);
  return Boolean(
    parsed?.pathname.includes(`/${VIP98K_REFERENCE_STAGING_KEY_PREFIX}`),
  );
}

export function getVip98kReferenceStagingObjectKey(mediaUrl: string) {
  const parsed = parseUrl(mediaUrl);
  if (parsed) {
    parsed.hash = "";
    parsed.searchParams.delete("sg_media_retry");
  }
  const cacheIdentity = parsed?.toString() || mediaUrl;
  const digest = createHash("sha256").update(cacheIdentity).digest("hex");
  return `${VIP98K_REFERENCE_CACHE_OBJECT_PREFIX}/${digest}.jpg`;
}

export function isUrlWithinPublicBase(mediaUrl: string, publicBaseUrl: string) {
  const media = parseUrl(mediaUrl);
  const base = parseUrl(publicBaseUrl);
  if (!media || !base || media.host.toLowerCase() !== base.host.toLowerCase()) {
    return false;
  }

  const basePath = base.pathname.replace(/\/+$/, "");
  if (!basePath) return true;
  return media.pathname === basePath || media.pathname.startsWith(`${basePath}/`);
}

export function shouldStageVip98kReferenceUrl(params: {
  mediaUrl: string;
  sourcePublicUrl: string;
  targetPublicUrl?: string;
}) {
  if (
    params.targetPublicUrl &&
    isUrlWithinPublicBase(params.mediaUrl, params.targetPublicUrl)
  ) {
    return false;
  }
  return isUrlWithinPublicBase(params.mediaUrl, params.sourcePublicUrl);
}

export function getStorageObjectKeyFromPublicUrl(
  mediaUrl: string,
  publicBaseUrl: string,
) {
  if (!isUrlWithinPublicBase(mediaUrl, publicBaseUrl)) return null;
  const media = parseUrl(mediaUrl);
  const base = parseUrl(publicBaseUrl);
  if (!media || !base) return null;
  const basePath = base.pathname.replace(/\/+$/, "");
  const encodedKey = media.pathname.slice(basePath.length).replace(/^\/+/, "");
  if (!encodedKey) return null;
  try {
    return decodeURIComponent(encodedKey);
  } catch {
    return encodedKey;
  }
}

export function getVip98kStagedMediaRetryDelay(params: {
  status: number;
  message: string;
  attempt: number;
  maxAttempts: number;
  stagedReferenceCount: number;
}) {
  if (
    params.status !== 400 ||
    params.stagedReferenceCount < 1 ||
    params.attempt >= params.maxAttempts ||
    !isMediaInputFailure(params.message)
  ) {
    return null;
  }
  return params.attempt * 20_000;
}

export function getVip98kSubmissionRetryDelay(params: {
  status: number;
  message: string;
  attempt: number;
  maxAttempts: number;
  retryAfterMs?: number | null;
}) {
  const recoverableSubmission =
    /pending\s+safe\s+reconciliation/i.test(params.message) ||
    /request\s+outcome\s+(?:is\s+)?unknown/i.test(params.message) ||
    /final\s+outcome\s+could\s+not\s+be\s+confirmed/i.test(params.message);
  if (
    params.status !== 503 ||
    params.attempt >= params.maxAttempts ||
    !recoverableSubmission
  ) {
    return null;
  }

  const providerDelay = Number(params.retryAfterMs);
  if (Number.isFinite(providerDelay) && providerDelay > 0) {
    return Math.min(Math.max(providerDelay, 1_000), 60_000);
  }
  return Math.min(params.attempt * 15_000, 30_000);
}

export function addVip98kReferenceRetryToken(mediaUrl: string, token: string) {
  const parsed = parseUrl(mediaUrl);
  if (!parsed) return mediaUrl;
  parsed.searchParams.set("sg_media_retry", token);
  return parsed.toString();
}