import type { H3Event } from "h3";
import { getRequestHeader } from "h3";

/** 与 Nitro `runtime/utils` 一致，避免依赖 `nitropack/.../utils` 的 TS 子路径解析 */
function hasReqHeader(event: H3Event, name: string, includes: string): boolean {
  const value = getRequestHeader(event, name);
  return Boolean(value && typeof value === "string" && value.toLowerCase().includes(includes));
}

export function isJsonRequest(event: H3Event): boolean {
  if (hasReqHeader(event, "accept", "text/html")) {
    return false;
  }
  return (
    hasReqHeader(event, "accept", "application/json") ||
    hasReqHeader(event, "user-agent", "curl/") ||
    hasReqHeader(event, "user-agent", "httpie/") ||
    hasReqHeader(event, "sec-fetch-mode", "cors") ||
    event.path.startsWith("/api/") ||
    event.path.endsWith(".json")
  );
}

export function normalizeError(error: any, isDev?: boolean) {
  const cwd = typeof process.cwd === "function" ? process.cwd() : "/";
  const stack =
    !isDev && !import.meta.prerender && (error.unhandled || error.fatal)
      ? []
      : (error.stack || "")
          .split("\n")
          .splice(1)
          .filter((line: string) => line.includes("at "))
          .map((line: string) => {
            const text = line
              .replace(cwd + "/", "./")
              .replace("webpack:/", "")
              .replace("file://", "")
              .trim();
            return {
              text,
              internal:
                (line.includes("node_modules") && !line.includes(".cache")) ||
                line.includes("internal") ||
                line.includes("new Promise"),
            };
          });
  const statusCode = error.statusCode || 500;
  const statusMessage = error.statusMessage ?? (statusCode === 404 ? "Not Found" : "");
  const message = !isDev && error.unhandled ? "internal server error" : error.message || error.toString();
  return {
    stack,
    statusCode,
    statusMessage,
    message,
  };
}