const THREE_ASSET_PROXY_PATH = "/api/canvas/3d/model-proxy";

const PROXY_HOST_KEYWORDS = [
  "tripo3d.ai",
  "tripo3d.com",
  "worldlabs",
  "marble",
  "s3.1080p.hk",
  "img.yydd.ai",
  "blob.vercel-storage.com",
  "aliyuncs.com",
  "amazonaws.com",
  "googleapis.com",
  "googleusercontent.com",
  "cloudfront.net",
];

function isSameOriginBrowserAssetUrl(raw: string) {
  if (typeof window === "undefined") return false;

  try {
    const parsed = new URL(raw, window.location.origin);
    return parsed.origin === window.location.origin;
  } catch {
    return false;
  }
}

export function shouldProxyThreeAssetUrl(value?: string | null) {
  const raw = String(value || "").trim();
  if (!raw || raw.startsWith("/") || raw.startsWith("blob:") || raw.startsWith("data:")) {
    return false;
  }

  if (isSameOriginBrowserAssetUrl(raw)) {
    return false;
  }

  try {
    const parsed = new URL(raw);
    if (parsed.protocol !== "https:" && parsed.protocol !== "http:") return false;
    const hostname = parsed.hostname.toLowerCase();
    return PROXY_HOST_KEYWORDS.some((keyword) => hostname.includes(keyword));
  } catch {
    return false;
  }
}

export function buildThreeAssetUrl(value?: string | null) {
  const raw = String(value || "").trim();
  if (!raw) return "";
  if (!shouldProxyThreeAssetUrl(raw)) return raw;
  return `${THREE_ASSET_PROXY_PATH}?url=${encodeURIComponent(raw)}`;
}