import { MatrixError } from 'matrix-js-sdk';
import { bytesToSize } from './common';

/**
 * [Gitea #213] One plain sentence for a failed upload. `MatrixError.message`
 * is the SDK's toString — "MatrixError: [413] nope (http://hs/_matrix/media/…)"
 * — which is what the card used to print. The raw error still goes to the
 * console for debugging.
 */
export const describeUploadError = (error: MatrixError, limitBytes?: number): string => {
  const status = error.httpStatus;
  const errcode = error.errcode;
  const serverText = (error.data as { error?: string } | undefined)?.error;

  if (status === 413 || errcode === 'M_TOO_LARGE') {
    const limit =
      typeof limitBytes === 'number' && Number.isFinite(limitBytes)
        ? ` (limit ${bytesToSize(limitBytes)})`
        : '';
    return `This file is larger than the server allows${limit}.`;
  }
  if (status === 429 || errcode === 'M_LIMIT_EXCEEDED') {
    return 'Slow down — try again in a moment.';
  }
  if (status === 401 || status === 403 || errcode === 'M_FORBIDDEN') {
    return serverText
      ? `The server refused this upload: ${serverText}`
      : 'The server refused this upload.';
  }
  if (typeof status !== 'number' || status === 408 || status >= 500) {
    // Transport failure after the retry loop gave up, or a server-side error.
    if (serverText === 'Upload cancelled') return 'Upload cancelled.';
    return "Couldn't reach the server. Check your connection and retry.";
  }
  // Any other 4xx: the server's own sentence, never the URL-bearing toString.
  return serverText ? serverText.replace(/\s*\(https?:\/\/[^)]*\)\s*$/, '') : 'Upload failed.';
};