/* =========================================================================
   OP·Karte – Leaflet + OpenStreetMap
   - farbige Kreis-Marker je Kategorie, Clustering (markercluster)
   - Kategorie-Filter (Checkboxen) + Textsuche, synchron mit der Card-Liste
   - Klick auf Card öffnet den zugehörigen Marker
   Daten kommen aus <script type="application/json" id="op-map-data">.
   ========================================================================= */
(function () {
  "use strict";

  function init() {
    var el = document.getElementById("op-map");
    if (!el || typeof L === "undefined") return;
    var dataNode = document.getElementById("op-map-data");
    if (!dataNode) return;

    var payload = JSON.parse(dataNode.textContent || "{}");
    var places = payload.places || [];
    var colors = payload.colors || {};
    var defaultColor = payload.defaultColor || "#1e2758";
    var tileUrl = payload.tileUrl || "https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png";
    var attribution = payload.attribution ||
      '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>-Mitwirkende';

    var map = L.map(el, { scrollWheelZoom: false });
    L.tileLayer(tileUrl, { maxZoom: 19, attribution: attribution }).addTo(map);
    map.on("focus", function () { map.scrollWheelZoom.enable(); });
    map.on("blur",  function () { map.scrollWheelZoom.disable(); });

    var useCluster = places.length > 1 && typeof L.markerClusterGroup === "function";
    var group = useCluster
      ? L.markerClusterGroup({ maxClusterRadius: 45, showCoverageOnHover: false })
      : L.featureGroup();
    map.addLayer(group);

    var byUrl = {};
    var records = [];

    places.forEach(function (p) {
      if (typeof p.lat !== "number" || typeof p.lng !== "number") return;
      var cat = (p.categories && p.categories[0]) || "";
      var color = colors[cat] || defaultColor;
      var marker = L.marker([p.lat, p.lng], {
        icon: pinIcon(color),
        riseOnHover: true,
        keyboard: true,
        title: p.title,          // nativer Browser-Tooltip / a11y
        alt: "Schauplatz: " + p.title
      });
      // Popup ohne autoPan, damit die Karte beim Hover nicht springt
      marker.bindPopup(popupHtml(p, cat, color), { autoPan: false, closeButton: true, minWidth: 250, maxWidth: 250 });
      // Beim Drüberfahren (Desktop) öffnet sich die Kurzinfo; Tap/Klick ebenso
      marker.on("mouseover", function () { marker.openPopup(); });
      var rec = { p: p, marker: marker, cats: p.categories || [], text: (p.title + " " + (p.subtitle || "") + " " + (p.address || "")).toLowerCase() };
      records.push(rec);
      if (p.url) byUrl[p.url] = rec;
    });

    var allBounds = records.length ? L.latLngBounds(records.map(function (r) { return r.marker.getLatLng(); })) : null;

    // --- Filter-Status ---
    var activeCats = null; // null = alle
    var query = "";

    function visible(rec) {
      if (query && rec.text.indexOf(query) === -1) return false;
      if (activeCats) {
        var ok = rec.cats.some(function (c) { return activeCats[c]; });
        if (!ok) return false;
      }
      return true;
    }

    function apply() {
      group.clearLayers();
      var shown = 0, bounds = L.latLngBounds([]);
      records.forEach(function (rec) {
        var v = visible(rec);
        if (v) { group.addLayer(rec.marker); shown++; bounds.extend(rec.marker.getLatLng()); }
      });
      // Cards synchronisieren
      cards.forEach(function (card) {
        var url = card.getAttribute("data-url");
        var rec = url && byUrl[url];
        var show;
        if (rec) show = visible(rec);
        else {
          // Cards ohne Koordinaten: nur Textsuche greift
          var t = (card.getAttribute("data-text") || "").toLowerCase();
          show = !query || t.indexOf(query) !== -1;
        }
        card.classList.toggle("is--hidden", !show);
      });
      var countCards = cards.filter(function (c) { return !c.classList.contains("is--hidden"); }).length;
      if (countEl) countEl.textContent = countCards;
      if (bounds.isValid()) map.fitBounds(bounds.pad(0.15));
      else if (allBounds) map.fitBounds(allBounds.pad(0.15));
    }

    // --- DOM-Hooks ---
    var cards = Array.prototype.slice.call(document.querySelectorAll("[data-op-card]"));
    var countEl = document.querySelector("[data-op-count]");
    var searchEl = document.querySelector("[data-op-search]");
    var filterEl = document.querySelector("[data-op-map-filter]");

    if (filterEl) {
      var stateEl = document.querySelector("[data-op-filter-state]");
      var wordAll = (stateEl && stateEl.getAttribute("data-word-all")) || "alle";
      var wordOf = (stateEl && stateEl.getAttribute("data-word-of")) || "von";
      var updateState = function () {
        if (!stateEl) return;
        var boxes = filterEl.querySelectorAll("input[type=checkbox]");
        var total = boxes.length, on = 0;
        boxes.forEach(function (cb) { if (cb.checked) on++; });
        stateEl.textContent = on === total ? "· " + wordAll : "· " + on + " " + wordOf + " " + total;
      };
      var updateCats = function () {
        var boxes = filterEl.querySelectorAll("input[type=checkbox]");
        activeCats = {};
        var anyUnchecked = false;
        boxes.forEach(function (cb) { activeCats[cb.value] = cb.checked; if (!cb.checked) anyUnchecked = true; });
        if (!anyUnchecked) activeCats = null; // alle aktiv → kein Filter
        updateState();
        apply();
      };
      filterEl.addEventListener("change", updateCats);
      updateState(); // Anfangszustand im eingeklappten Filter anzeigen

      // Schnellauswahl: alle auswählen / abwählen
      var setAll = function (state) {
        filterEl.querySelectorAll("input[type=checkbox]").forEach(function (cb) { cb.checked = state; });
        updateCats();
      };
      var btnAll = document.querySelector("[data-op-filter-all]");
      var btnNone = document.querySelector("[data-op-filter-none]");
      if (btnAll) btnAll.addEventListener("click", function () { setAll(true); });
      if (btnNone) btnNone.addEventListener("click", function () { setAll(false); });
    }
    if (searchEl) {
      var deb;
      searchEl.addEventListener("input", function () {
        clearTimeout(deb);
        deb = setTimeout(function () { query = searchEl.value.trim().toLowerCase(); apply(); }, 150);
      });
    }

    // Cards sind normale Links → Klick führt direkt zur Detailseite.
    // (Die Verortung passiert über die Marker/Popups auf der Karte.)

    // Vorbelegung aus URL (?q=…), z.B. von der Kopf-Suche
    try {
      var q0 = new URLSearchParams(location.search).get("q");
      if (q0) { query = q0.trim().toLowerCase(); if (searchEl) searchEl.value = q0; }
    } catch (e) {}

    // Erstanzeige (apply() befüllt die Layer-Gruppe und setzt den Ausschnitt)
    if (!records.length) map.setView([50.9, 11.6], 6);
    apply();
  }

  function pinIcon(color) {
    var svg =
      '<svg class="op-pin" width="30" height="42" viewBox="0 0 30 42" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">' +
        '<path d="M15 41 C15 41 3 24 3 14 A12 12 0 1 1 27 14 C27 24 15 41 15 41 Z" fill="' + color + '" stroke="#ffffff" stroke-width="2.5"/>' +
        '<circle cx="15" cy="14" r="5" fill="#ffffff"/>' +
      '</svg>';
    return L.divIcon({
      html: svg,
      className: "op-pinwrap",
      iconSize: [30, 42],
      iconAnchor: [15, 41],
      popupAnchor: [0, -36]
    });
  }

  function popupHtml(p, cat, color) {
    var tag = p.url ? "a" : "div";
    var href = p.url ? ' href="' + p.url + '"' : "";
    var h = "<" + tag + ' class="op-popup"' + href + ">";
    if (p.img) h += '<span class="op-popup__img" style="background-image:url(\'' + p.img + '\')"></span>';
    h += '<span class="op-popup__body">';
    h += '<span class="op-popup__title">' + esc(p.title) + "</span>";
    var meta = p.address || p.subtitle || "";
    if (meta) h += '<span class="op-popup__addr">' + esc(meta) + "</span>";
    h += "</span></" + tag + ">";
    return h;
  }
  function esc(s) {
    return String(s == null ? "" : s).replace(/&/g, "&amp;").replace(/</g, "&lt;")
      .replace(/>/g, "&gt;").replace(/"/g, "&quot;");
  }

  if (document.readyState !== "loading") init();
  else document.addEventListener("DOMContentLoaded", init);
})();