globalThis.Wegwichtel ??= {};
(function (ns) {
  'use strict';
  const INTERVAL_MS = 30000;
  let id = null;
  let editingId = null;
  let status = 'idle';
  let timer = null;
  let generation = 0;
  let pending = false;
  let message = '';
  let manualFields = [];
  let lastPosition = null;

  function render() {
    const control = document.getElementById('route-recording-control');
    if (!control) return;
    control.hidden = status === 'idle';
    document.getElementById('route-recording-status').textContent = status === 'idle' ? '' : message || ns.I18n.t(`recorder.${status}`);
    document.getElementById('route-recording-pause').textContent = ns.I18n.t(status === 'paused' ? 'recorder.resume' : 'recorder.pause');
  }

  async function sample() {
    if (pending || status !== 'recording') return;
    pending = true;
    const currentGeneration = generation;
    try {
      let position;
      try { position = await ns.Geo.current({ maximumAge: 0 }); }
      catch { position = { timestamp: Date.now() }; }
      if (currentGeneration !== generation || status !== 'recording') return;
      lastPosition = Number.isFinite(position.lat) && Number.isFinite(position.lon) ? position : null;
      const route = ns.LocalRoutes.get(id);
      if (!route) { stop(); return; }
      const gpx = ns.LocalRoutes.appendTrackPoint(route.gpx, position, route.route.name);
      ns.LocalRoutes.save({ ...route, gpx });
      message = ns.I18n.t(Number.isFinite(position.lat) && Number.isFinite(position.lon) ? 'recorder.recording' : 'recorder.no-location');
    } catch (error) {
      pause();
      ns.StorageUsage?.reportError(error);
      message = ns.I18n.t('recorder.save-error');
    } finally {
      pending = false;
      render();
    }
  }

  function clearTimer() {
    if (timer !== null) globalThis.clearInterval(timer);
    timer = null;
    generation += 1;
  }

  function resume() {
    if (!id) return;
    clearTimer();
    status = 'recording';
    message = '';
    timer = globalThis.setInterval(sample, INTERVAL_MS);
    sample();
    render();
  }

  function pause() {
    clearTimer();
    status = id ? 'paused' : 'idle';
    message = '';
    render();
  }

  function stop() {
    clearTimer();
    id = null;
    lastPosition = null;
    status = 'idle';
    message = '';
    render();
  }

  function start(routeId) {
    lastPosition = null;
    id = String(routeId);
    editingId = id;
    resume();
  }

  function beginEditing(routeId) {
    if (editingId === String(routeId)) return;
    stop();
    start(routeId);
  }

  function endEditing() {
    editingId = null;
    stop();
  }

  function addPositionField(position = {}, index = null) {
    const container = document.getElementById('editor-recorded-positions');
    if (!container) return;
    const row = document.createElement('fieldset');
    const legend = document.createElement('legend');
    legend.textContent = ns.I18n.t('recorder.position-number', { number: manualFields.length + 1 });
    row.appendChild(legend);
    const fields = {};
    for (const [key, textKey, minimum, maximum] of [['lat', 'latitude', -90, 90], ['lon', 'longitude', -180, 180]]) {
      const label = document.createElement('label');
      const input = document.createElement('input');
      input.id = `recorded-position-${manualFields.length}-${key}`;
      label.setAttribute('for', input.id);
      label.textContent = ns.I18n.t(`recorder.${textKey}`);
      input.type = 'number'; input.step = 'any'; input.min = minimum; input.max = maximum;
      input.value = position[key] == null ? '' : String(position[key]);
      row.appendChild(label); row.appendChild(input);
      fields[key] = input;
    }
    manualFields.push({ index, original: position, ...fields });
    container.appendChild(row);
  }

  function renderPoints(gpx) {
    const container = document.getElementById('editor-recorded-positions');
    if (!container) return;
    container.replaceChildren();
    manualFields = [];
    ns.LocalRoutes.recordedPositions(gpx).forEach(addPositionField);
  }

  function editGpx(gpx, routeName) {
    let changed = false;
    const positions = ns.LocalRoutes.recordedPositions(gpx);
    for (const field of manualFields) {
      const values = ['lat', 'lon'].map(key => field[key].value.trim() === '' ? null : Number(field[key].value));
      const [lat, lon] = values;
      if ((lat === null) !== (lon === null) || (lat !== null && (!Number.isFinite(lat) || !Number.isFinite(lon) || Math.abs(lat) > 90 || Math.abs(lon) > 180))) {
        throw new Error(ns.I18n.t('editor.error.station-location'));
      }
      if (field.index !== null && lat === field.original.lat && lon === field.original.lon) continue;
      const point = { ...field.original, lat, lon };
      if (field.index === null) positions.push(point);
      else positions[field.index] = point;
      changed = true;
    }
    return changed ? ns.LocalRoutes.replaceRecordedPositions(gpx, positions, routeName) : gpx;
  }

  function bind() {
    globalThis.addEventListener?.('pagehide', endEditing);
    const activate = (elementId, action) => {
      const element = document.getElementById(elementId);
      element?.addEventListener('pointerup', event => {
        if (event.isPrimary === false || (event.pointerType === 'mouse' && event.button !== 0)) return;
        event.preventDefault();
        action();
      });
      element?.addEventListener('keydown', event => {
        if (event.key !== 'Enter' && event.key !== ' ') return;
        event.preventDefault();
        action();
      });
    };
    activate('route-recording-pause', () => status === 'recording' ? pause() : resume());
    activate('route-recording-stop', stop);
    activate('editor-add-position', () => addPositionField({ timestamp: new Date().toISOString() }));
    document.addEventListener('wegwichtel:local-routes-changed', () => {
      if (id && !ns.LocalRoutes.get(id)) stop();
    });
  }

  ns.RouteRecorder = Object.freeze({ start, pause, resume, stop, beginEditing, endEditing, renderPoints, editGpx, get status() { return status; }, get routeId() { return id; }, get position() { return lastPosition; } });
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', bind, { once: true });
  else bind();
}(globalThis.Wegwichtel));