import { addHandler, maybeInstrument, timestampInSeconds, isString, triggerHandlers } from '@sentry/core';
import { WINDOW } from '../types.js';

const SENTRY_XHR_DATA_KEY = "__sentry_xhr_v3__";
function addXhrInstrumentationHandler(handler) {
  const type = "xhr";
  addHandler(type, handler);
  maybeInstrument(type, instrumentXHR);
}
function instrumentXHR() {
  if (!WINDOW.XMLHttpRequest) {
    return;
  }
  const xhrproto = XMLHttpRequest.prototype;
  xhrproto.open = new Proxy(xhrproto.open, {
    apply(originalOpen, xhrOpenThisArg, xhrOpenArgArray) {
      const virtualError = new Error();
      const startTimestamp = timestampInSeconds() * 1e3;
      const method = isString(xhrOpenArgArray[0]) ? xhrOpenArgArray[0].toUpperCase() : void 0;
      const url = parseXhrUrlArg(xhrOpenArgArray[1]);
      if (!method || !url) {
        return originalOpen.apply(xhrOpenThisArg, xhrOpenArgArray);
      }
      xhrOpenThisArg[SENTRY_XHR_DATA_KEY] = {
        method,
        url,
        request_headers: {}
      };
      if (method === "POST" && url.match(/sentry_key/)) {
        xhrOpenThisArg.__sentry_own_request__ = true;
      }
      const onreadystatechangeHandler = () => {
        const xhrInfo = xhrOpenThisArg[SENTRY_XHR_DATA_KEY];
        if (!xhrInfo) {
          return;
        }
        if (xhrOpenThisArg.readyState === 4) {
          try {
            xhrInfo.status_code = xhrOpenThisArg.status;
          } catch {
          }
          const handlerData = {
            endTimestamp: timestampInSeconds() * 1e3,
            startTimestamp,
            xhr: xhrOpenThisArg,
            virtualError
          };
          triggerHandlers("xhr", handlerData);
        }
      };
      if ("onreadystatechange" in xhrOpenThisArg && typeof xhrOpenThisArg.onreadystatechange === "function") {
        xhrOpenThisArg.onreadystatechange = new Proxy(xhrOpenThisArg.onreadystatechange, {
          apply(originalOnreadystatechange, onreadystatechangeThisArg, onreadystatechangeArgArray) {
            onreadystatechangeHandler();
            return originalOnreadystatechange.apply(onreadystatechangeThisArg, onreadystatechangeArgArray);
          }
        });
      } else {
        xhrOpenThisArg.addEventListener("readystatechange", onreadystatechangeHandler);
      }
      xhrOpenThisArg.setRequestHeader = new Proxy(xhrOpenThisArg.setRequestHeader, {
        apply(originalSetRequestHeader, setRequestHeaderThisArg, setRequestHeaderArgArray) {
          const [header, value] = setRequestHeaderArgArray;
          const xhrInfo = setRequestHeaderThisArg[SENTRY_XHR_DATA_KEY];
          if (xhrInfo && isString(header) && isString(value)) {
            xhrInfo.request_headers[header.toLowerCase()] = value;
          }
          return originalSetRequestHeader.apply(setRequestHeaderThisArg, setRequestHeaderArgArray);
        }
      });
      return originalOpen.apply(xhrOpenThisArg, xhrOpenArgArray);
    }
  });
  xhrproto.send = new Proxy(xhrproto.send, {
    apply(originalSend, sendThisArg, sendArgArray) {
      const sentryXhrData = sendThisArg[SENTRY_XHR_DATA_KEY];
      if (!sentryXhrData) {
        return originalSend.apply(sendThisArg, sendArgArray);
      }
      if (sendArgArray[0] !== void 0) {
        sentryXhrData.body = sendArgArray[0];
      }
      const handlerData = {
        startTimestamp: timestampInSeconds() * 1e3,
        xhr: sendThisArg
      };
      triggerHandlers("xhr", handlerData);
      return originalSend.apply(sendThisArg, sendArgArray);
    }
  });
}
function parseXhrUrlArg(url) {
  if (isString(url)) {
    return url;
  }
  try {
    return url.toString();
  } catch {
  }
  return void 0;
}

export { SENTRY_XHR_DATA_KEY, addXhrInstrumentationHandler, instrumentXHR };
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