globalThis.Wegwichtel = globalThis.Wegwichtel || {};

(function (ns) {
  'use strict';

  const PRIVACY_KEY = 'wegwichtel.privacy.v1';
  const PROGRESS_KEY = 'wegwichtel.route-progress.v1';
  const MAX_PROGRESS_AGE_MS = 24 * 60 * 60 * 1000;

  function storage() {
    try {
      return globalThis.localStorage ?? null;
    } catch {
      return null;
    }
  }

  function now() {
    return Date.now();
  }

  function readJson(key, fallback) {
    const store = storage();
    if (!store) return fallback;

    try {
      const raw = store.getItem(key);
      if (!raw) return fallback;
      const value = JSON.parse(raw);
      return value && typeof value === 'object' ? value : fallback;
    } catch {
      return fallback;
    }
  }

  function writeJson(key, value) {
    const store = storage();
    if (!store) return false;

    try {
      store.setItem(key, JSON.stringify(value));
      return true;
    } catch {
      return false;
    }
  }

  function removeItem(key) {
    const store = storage();
    if (!store) return false;

    try {
      store.removeItem(key);
      return true;
    } catch {
      return false;
    }
  }

  function normalizeSettings(value) {
    return {
      progressStorage: value?.progressStorage === true,
      cookies: false,
      updatedAt: Number(value?.updatedAt) || now()
    };
  }

  function readSettings() {
    return normalizeSettings(readJson(PRIVACY_KEY, {}));
  }

  function writeSettings(settings) {
    const value = normalizeSettings({ ...settings, updatedAt: now() });
    return writeJson(PRIVACY_KEY, value);
  }

  function isProgressStorageEnabled() {
    return readSettings().progressStorage === true;
  }

  function setProgressStorageEnabled(enabled) {
    const nextValue = Boolean(enabled);
    writeSettings({ progressStorage: nextValue, cookies: false });
    if (!nextValue) removeItem(PROGRESS_KEY);
    return nextValue;
  }

  function routeId(route) {
    const id = route?.id ?? route?.routeId ?? route;
    if (id === null || id === undefined || id === '') return null;
    return String(id);
  }

  function numericIdSet(values) {
    if (!Array.isArray(values)) return [];
    return [...new Set(values.map(Number).filter(Number.isFinite))];
  }

  function addNumericId(values, value) {
    return numericIdSet([...values, value]);
  }

  function isRouteStateObject(value) {
    return value && typeof value === 'object' && (
      Object.hasOwn(value, 'routeId')
      || Object.hasOwn(value, 'routeState')
      || Object.hasOwn(value, 'routeProgressIndex')
      || Object.hasOwn(value, 'visitedPoiIds')
      || Object.hasOwn(value, 'viewedPoiIds')
      || Object.hasOwn(value, 'playedAudioPoiIds')
    );
  }

  function progressEnvelope(value) {
    if (!value || typeof value !== 'object') return {};
    if (value.routes && typeof value.routes === 'object') return value.routes;
    if (isRouteStateObject(value)) {
      const id = routeId(value);
      return id ? { [id]: value } : {};
    }
    return value;
  }

  function readProgressStore() {
    return progressEnvelope(readJson(PROGRESS_KEY, {}));
  }

  function writeProgressStore(routes) {
    return writeJson(PROGRESS_KEY, {
      version: 1,
      updatedAt: now(),
      routes
    });
  }

  function stateTimestamp(value) {
    return Number(value?.updatedAt) || Number(value?.savedAt) || now();
  }

  function normalizeRouteState(value, fallbackRouteId = null) {
    if (!value || typeof value !== 'object') return null;

    const id = value.routeId === null || value.routeId === undefined
      ? fallbackRouteId
      : value.routeId;

    return {
      routeId: id === null || id === undefined ? null : String(id),
      routeName: String(value.routeName ?? ''),
      routeState: value.routeState === 'running' || value.routeState === 'paused' ? value.routeState : 'idle',
      routeProgressIndex: Number.isInteger(value.routeProgressIndex) ? value.routeProgressIndex : null,
      visitedPoiIds: numericIdSet(value.visitedPoiIds),
      viewedPoiIds: numericIdSet(value.viewedPoiIds),
      playedAudioPoiIds: numericIdSet(value.playedAudioPoiIds),
      savedAt: Number(value.savedAt) || Number(value.updatedAt) || now(),
      updatedAt: stateTimestamp(value)
    };
  }

  function freshEmptyRouteState(id, route = null) {
    const timestamp = now();
    return {
      routeId: id,
      routeName: route?.name ?? '',
      routeState: 'idle',
      routeProgressIndex: null,
      visitedPoiIds: [],
      viewedPoiIds: [],
      playedAudioPoiIds: [],
      savedAt: timestamp,
      updatedAt: timestamp
    };
  }

  function currentRouteState(routes, id, route = null) {
    const normalized = normalizeRouteState(routes[id], id);
    return normalized ?? freshEmptyRouteState(id, route);
  }

  function isExpired(value, referenceTime = now()) {
    const timestamp = Number(value?.updatedAt) || Number(value?.savedAt) || now();
    return referenceTime - timestamp > MAX_PROGRESS_AGE_MS;
  }

  function reportCleanupProgress(callback, processed, total, removed) {
    if (typeof callback !== 'function') return;
    callback({ processed, total, removed });
  }

  function updateRouteState(route, updater) {
    if (!isProgressStorageEnabled()) return false;

    const id = routeId(route);
    if (!id || typeof updater !== 'function') return false;

    const routes = readProgressStore();
    const entry = currentRouteState(routes, id, typeof route === 'object' ? route : null);
    const updated = updater(entry) ?? entry;
    updated.routeId = id;
    updated.updatedAt = now();
    if (!updated.savedAt) updated.savedAt = updated.updatedAt;
    routes[id] = normalizeRouteState(updated, id);
    return writeProgressStore(routes);
  }

  function markVisited(route, poiId) {
    return updateRouteState(route, entry => ({
      ...entry,
      visitedPoiIds: addNumericId(entry.visitedPoiIds, poiId)
    }));
  }

  function markViewed(route, poiId) {
    return updateRouteState(route, entry => ({
      ...entry,
      viewedPoiIds: addNumericId(entry.viewedPoiIds, poiId)
    }));
  }

  function markAudioPlayed(route, poiId) {
    return updateRouteState(route, entry => ({
      ...entry,
      playedAudioPoiIds: addNumericId(entry.playedAudioPoiIds, poiId)
    }));
  }

  function saveRouteState(route, routeState, routeProgressIndex, visitedPoiIds = [], viewedPoiIds = [], playedAudioPoiIds = []) {
    if (!isProgressStorageEnabled()) return false;

    const id = routeId(route);
    if (!id) return false;

    const timestamp = now();
    const routes = readProgressStore();
    routes[id] = {
      routeId: id,
      routeName: route?.name ?? '',
      routeState: routeState === 'running' || routeState === 'paused' ? routeState : 'idle',
      routeProgressIndex: Number.isInteger(routeProgressIndex) ? routeProgressIndex : null,
      visitedPoiIds: numericIdSet(visitedPoiIds),
      viewedPoiIds: numericIdSet(viewedPoiIds),
      playedAudioPoiIds: numericIdSet(playedAudioPoiIds),
      savedAt: timestamp,
      updatedAt: timestamp
    };
    return writeProgressStore(routes);
  }

  function cleanupExpired(progressCallback) {
    const referenceTime = now();
    const routes = readProgressStore();
    const entries = Object.entries(routes);
    const kept = {};
    let removed = 0;

    entries.forEach(([id, value], index) => {
      const normalized = normalizeRouteState(value, id);
      if (normalized && !isExpired(normalized, referenceTime)) kept[id] = normalized;
      else removed += 1;
      reportCleanupProgress(progressCallback, index + 1, entries.length, removed);
    });

    if (removed > 0) writeProgressStore(kept);
    return { removed, total: entries.length, routes: kept };
  }

  async function cleanupExpiredProgress(progressCallback) {
    return cleanupExpired(progressCallback);
  }

  function activateRoute(route) {
    if (!isProgressStorageEnabled()) return null;

    const id = routeId(route);
    if (!id) return null;

    const routes = cleanupExpired().routes;
    const saved = normalizeRouteState(routes[id], id);
    return saved && !isExpired(saved) ? saved : null;
  }

  ns.PrivacyStorage = Object.freeze({
    PRIVACY_KEY,
    PROGRESS_KEY,
    MAX_PROGRESS_AGE_MS,
    activateRoute,
    cleanExpiredProgress: cleanupExpiredProgress,
    cleanupExpired,
    cleanupExpiredProgress,
    cookiesEnabled: () => false,
    getPrivacySettings: readSettings,
    isProgressStorageEnabled,
    markAudioPlayed,
    markPlayed: markAudioPlayed,
    markPlayedAudio: markAudioPlayed,
    markVisited,
    markViewed,
    removeExpiredProgress: cleanupExpiredProgress,
    removeExpiredRouteProgress: cleanupExpiredProgress,
    saveRouteState,
    setProgressStorageEnabled
  });
}(globalThis.Wegwichtel));