/* Shared Leaflet helper: a small OSM route preview (origin/destination
   markers + a straight line between them - we don't have real route
   geometry, just stop coordinates, so this is a "as the crow flies" hint,
   not a turn-by-turn path).

   Exposes window.PbtMap.createRouteMap(containerId) and self-wires:
   - the "Von"/"Nach" live preview on the trip form (#route-map)
   - the map-pin buttons + dialog on the "Meine Fahrten" list

   No-ops safely wherever these elements/Leaflet aren't present. */
(function () {
  "use strict";
  if (typeof window.L === "undefined") return;

  var ORIGIN_COLOR = "#3fb950";
  var DEST_COLOR = "#f85149";
  var AUSTRIA_CENTER = [47.6, 14.0];

  function dot(color) {
    return L.divIcon({
      className: "",
      html: '<span style="display:block;width:14px;height:14px;border-radius:50%;' +
        "background:" + color + ';border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.5)"></span>',
      iconSize: [14, 14],
      iconAnchor: [7, 7],
    });
  }

  function createRouteMap(containerId) {
    var map = L.map(containerId).setView(AUSTRIA_CENTER, 7);
    L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
      maxZoom: 19,
      attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>-Mitwirkende',
    }).addTo(map);

    var layers = [];
    function clear() {
      layers.forEach(function (l) { map.removeLayer(l); });
      layers = [];
    }

    function render(origin, destination) {
      clear();
      var points = [];
      if (origin) {
        var o = L.marker([origin.lat, origin.lon], { icon: dot(ORIGIN_COLOR) }).addTo(map);
        if (origin.label) o.bindTooltip(origin.label);
        layers.push(o);
        points.push([origin.lat, origin.lon]);
      }
      if (destination) {
        var d = L.marker([destination.lat, destination.lon], { icon: dot(DEST_COLOR) }).addTo(map);
        if (destination.label) d.bindTooltip(destination.label);
        layers.push(d);
        points.push([destination.lat, destination.lon]);
      }
      if (points.length === 2) {
        layers.push(
          L.polyline(points, { color: "#4a9eff", weight: 3, dashArray: "6 8", opacity: 0.85 }).addTo(map)
        );
        map.fitBounds(L.latLngBounds(points), { padding: [28, 28], maxZoom: 15 });
      } else if (points.length === 1) {
        map.setView(points[0], 14);
      } else {
        map.setView(AUSTRIA_CENTER, 7);
      }
      return points.length > 0;
    }

    return { map: map, render: render };
  }

  window.PbtMap = { createRouteMap: createRouteMap };

  // --- live preview on the trip form -------------------------------------
  function setupFormPreview(form) {
    var container = form.querySelector("#route-map");
    var placeholder = form.querySelector("[data-route-map-placeholder]");
    var originText = form.querySelector("#origin");
    var destText = form.querySelector("#destination");
    var originHidden = form.querySelector("#origin_stop_id");
    var destHidden = form.querySelector("#destination_stop_id");
    if (!container || !originText || !destText || !originHidden || !destHidden) return;

    var routeMap = null;

    function point(hidden, text) {
      var lat = hidden.dataset.stopLat, lon = hidden.dataset.stopLon;
      if (!lat || !lon) return null;
      return { lat: parseFloat(lat), lon: parseFloat(lon), label: text.value.trim() };
    }

    function apply() {
      var origin = point(originHidden, originText);
      var destination = point(destHidden, destText);
      if (!origin && !destination) {
        container.hidden = true;
        if (placeholder) placeholder.hidden = false;
        return;
      }
      container.hidden = false;
      if (placeholder) placeholder.hidden = true;
      if (!routeMap) routeMap = createRouteMap("route-map");
      routeMap.render(origin, destination);
      setTimeout(function () { routeMap.map.invalidateSize(); }, 0);
    }

    form.addEventListener("stopchange", apply);
    originText.addEventListener("input", apply);
    destText.addEventListener("input", apply);
    apply();
  }

  document.querySelectorAll("form").forEach(setupFormPreview);

  // --- "Meine Fahrten" map-pin buttons + shared dialog --------------------
  var dialog = document.getElementById("route-map-dialog");
  if (dialog) {
    var dialogTitle = document.getElementById("route-map-dialog-title");
    var closeBtn = dialog.querySelector("[data-close-map-dialog]");
    var dialogMap = null;

    function coordsOf(btn, prefix) {
      var lat = btn.dataset[prefix + "Lat"], lon = btn.dataset[prefix + "Lon"];
      if (!lat || !lon) return null;
      return { lat: parseFloat(lat), lon: parseFloat(lon), label: btn.dataset[prefix + "Label"] || "" };
    }

    document.querySelectorAll("[data-show-map]").forEach(function (btn) {
      btn.addEventListener("click", function () {
        var origin = coordsOf(btn, "origin");
        var destination = coordsOf(btn, "destination");
        dialogTitle.textContent = (btn.dataset.originLabel || "?") + " → " + (btn.dataset.destinationLabel || "?");
        dialog.showModal();
        if (!dialogMap) dialogMap = createRouteMap("dialog-route-map");
        dialogMap.render(origin, destination);
        setTimeout(function () { dialogMap.map.invalidateSize(); }, 0);
      });
    });

    if (closeBtn) closeBtn.addEventListener("click", function () { dialog.close(); });
    dialog.addEventListener("click", function (e) {
      if (e.target === dialog) dialog.close(); // click on the backdrop
    });
  }
})();