import { useEffect, useState } from "react";
import { MapContainer, Marker, Popup, TileLayer, useMap } from "react-leaflet";
import L from "leaflet";
import "leaflet/dist/leaflet.css";
import { useApp } from "../state/store";
import { Pulse } from "../components/icons";
import { attendanceApi, type AttendanceSite } from "../lib/attendanceApi";

L.Marker.prototype.options.icon = L.icon({
  iconUrl: "https://unpkg.com/leaflet@1.9.4/dist/images/marker-icon.png",
  iconRetinaUrl: "https://unpkg.com/leaflet@1.9.4/dist/images/marker-icon-2x.png",
  shadowUrl: "https://unpkg.com/leaflet@1.9.4/dist/images/marker-shadow.png",
  iconSize: [25, 41],
  iconAnchor: [12, 41],
  popupAnchor: [1, -34],
  shadowSize: [41, 41],
});

function statusTag(s: AttendanceSite["status"]) {
  if (s === "checked_in") return "ON-SITE";
  if (s === "late") return "LATE";
  return "OFF";
}

function FitToSites({ sites }: { sites: AttendanceSite[] }) {
  const map = useMap();
  useEffect(() => {
    if (!sites.length) return;
    const bounds = L.latLngBounds(sites.map((s) => [s.lat, s.lng] as [number, number]));
    map.fitBounds(bounds, { padding: [40, 40] });
  }, [map, sites]);
  return null;
}

export default function GeoAttendance() {
  const setScene = useApp((s) => s.setScene);
  const pushToast = useApp((s) => s.pushToast);
  const [filter, setFilter] = useState<"all" | AttendanceSite["kind"]>("all");
  const [sites, setSites] = useState<AttendanceSite[] | null>(null);
  useEffect(() => {
    let cancelled = false;
    attendanceApi
      .listSites()
      .then((rows) => !cancelled && setSites(rows))
      .catch((err) => !cancelled && pushToast("err", `Sites failed: ${err.message}`));
    return () => { cancelled = true; };
  }, []);
  const allSites = sites || [];
  const visible = filter === "all" ? allSites : allSites.filter((s) => s.kind === filter);
  const stats = allSites.reduce(
    (acc, s) => ({
      onSite: acc.onSite + (s.status === "checked_in" ? 1 : 0),
      late: acc.late + (s.status === "late" ? 1 : 0),
      off: acc.off + (s.status === "checked_out" ? 1 : 0),
    }),
    { onSite: 0, late: 0, off: 0 }
  );

  return (
    <div className="geo-scene">
      <header className="geo-head">
        <div className="mc-hero-eyebrow"><Pulse size={12} /> Attendance map</div>
        <h2 className="mc-hero-title">Where your people are</h2>
        <p className="geo-intro">
          Live sites and check-in statuses sourced from EA2. Add a site by inserting an attendance flow doc (kind=value, source_context=CANVAS_ATTENDANCE_SITE) and linking it to flow/attendance_root via a defines edge with role=presentation. Tiles are served by OpenStreetMap.
        </p>
        {sites !== null && allSites.length === 0 && (
          <p className="geo-empty">No sites configured yet. Seed `qa/seeds/003_attendance_sites.mjs` to add the default canvas attendance roster.</p>
        )}
        <div className="geo-stats">
          <span className="geo-stat geo-stat-ok">{stats.onSite} on-site</span>
          <span className="geo-stat geo-stat-late">{stats.late} late</span>
          <span className="geo-stat geo-stat-off">{stats.off} off-shift</span>
        </div>
        <div className="geo-filter-row">
          {(["all", "store", "office", "warehouse"] as const).map((k) => (
            <button
              key={k}
              className={`hub-chip ${filter === k ? "active" : ""}`}
              onClick={() => setFilter(k)}
            >
              {k.toUpperCase()}
            </button>
          ))}
          <button className="hub-chip" onClick={() => setScene("hub-hr")}>People Hub</button>
        </div>
      </header>

      <div className="geo-map-wrap">
        <MapContainer center={[51.5074, -0.1278]} zoom={4} scrollWheelZoom={false} className="geo-map">
          <TileLayer
            attribution='&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a>'
            url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
          />
          <FitToSites sites={visible} />
          {visible.map((s) => (
            <Marker key={s._key} position={[s.lat, s.lng]}>
              <Popup>
                <strong>{s.label}</strong>
                <br />
                <span className={`geo-popup-tag geo-popup-${s.status}`}>{statusTag(s.status)}</span>
                <br />
                {s.who}
              </Popup>
            </Marker>
          ))}
        </MapContainer>
      </div>
    </div>
  );
}