globalThis.Wegwichtel ??= {};
(function (ns) {
  'use strict';

  function messageText(error) {
    const value = error?.responseJSON?.message || error?.message || error;
    if (typeof value !== 'string') return '';
    try {
      const parsed = JSON.parse(value);
      return typeof parsed.message === 'string' ? parsed.message : '';
    } catch {
      return value;
    }
  }

  const explanations = [
    [/Freigegebene Strecken dürfen nur/, "errors.delete-published"],
    [/Freigegebene Strecken können/, "errors.edit-published"],
    [/GPX|XML|Trackpunkte/, "errors.invalid-track"],
    [/POI.*nicht gefunden/, "errors.station-missing"],
    [/POI-Koordinaten/, "errors.station-location"],
    [/Bildformat|Bilddatei/, "errors.image-format"],
    [/Audioformat|Audiodatei/, "errors.audio-format"]
  ];
  const statusExplanations = new Map([
    [413, "errors.file-size"],
    [401, "errors.permission"],
    [403, "errors.permission"]
  ]);

  function readableMessage(message, fallback) {
    if (/\b(?:HTTP|API|HTTPS|JSON|IndexedDB|OPFS|CacheStorage|Base64|Blob|Server|sequence|dataUrl|PUT|POST)\b|https?:\/\/|[{}]/i.test(message)) return fallback;
    if (/\b(?:Failed|NetworkError|TypeError|AbortError|SecurityError|NotAllowedError|undefined)\b/i.test(message)) return fallback;
    if (message && readablePatterns.some(pattern => pattern.test(message))) return message;
    return fallback;
  }

  const readablePatterns = [
    /[äöüÄÖÜß]/,
    /\b(?:The|This|Your|Please|Choose|Allow|Give|Save|Remove|Trail|Stop|There)\b/,
    /\b(?:Die|Der|Das|Dein|Deine|Diese|Dieser|Dieses|Bitte|Wähle|Erlaube)\b/,
    /\b(?:Ein|Eine|Kein|Keine|Speicher|Strecke|Station|Wegwichtel|Gespeichert|Entferne)\b/
  ];

  function errorMessage(error, fallback = ns.I18n.t("editor.error.generic")) {
    const message = messageText(error);
    if (error?.name === 'QuotaExceededError' || error?.cause?.name === 'QuotaExceededError') return ns.I18n.t("errors.quota");
    const explanation = explanations.find(([pattern]) => pattern.test(message));
    if (explanation) return ns.I18n.t(explanation[1]);
    const statusExplanation = statusExplanations.get(error?.status);
    if (statusExplanation) return ns.I18n.t(statusExplanation);
    if (error?.status >= 500) return ns.I18n.t("errors.unavailable");
    return readableMessage(message, fallback);
  }

  ns.UserMessages = Object.freeze({ error: errorMessage });
}(globalThis.Wegwichtel));