import { timestampDate } from "@bufbuild/protobuf/wkt";
import L, { DivIcon } from "leaflet";
import "leaflet.markercluster/dist/MarkerCluster.css";
import { ArrowUpRightIcon, MapPinIcon } from "lucide-react";
import { useEffect, useMemo } from "react";
import { MapContainer, Marker, Popup, useMap } from "react-leaflet";
import MarkerClusterGroup from "react-leaflet-cluster";
import { Link } from "react-router-dom";
import { defaultMarkerIcon, ThemedTileLayer } from "@/components/map/map-utils";
import { buildMemoCreatorFilter } from "@/helpers/resource-names";
import { useInfiniteMemos } from "@/hooks/useMemoQueries";
import { cn } from "@/lib/utils";
import { State } from "@/types/proto/api/v1/common_pb";
import { Memo } from "@/types/proto/api/v1/memo_service_pb";

interface Props {
  creator: string;
  className?: string;
}

interface ClusterGroup {
  getChildCount(): number;
}

const createClusterCustomIcon = (cluster: ClusterGroup) => {
  return new DivIcon({
    html: `<span class="flex h-8 w-8 items-center justify-center rounded-full border border-border bg-background/95 text-xs font-semibold text-foreground shadow-sm backdrop-blur-sm">${cluster.getChildCount()}</span>`,
    className: "border-none bg-transparent",
    iconSize: L.point(32, 32, true),
  });
};

const MapFitBounds = ({ memos }: { memos: Memo[] }) => {
  const map = useMap();

  useEffect(() => {
    if (memos.length === 0) return;

    const validMemos = memos.filter((m) => m.location);
    if (validMemos.length === 0) return;

    const bounds = L.latLngBounds(validMemos.map((memo) => [memo.location!.latitude, memo.location!.longitude]));
    map.fitBounds(bounds, { padding: [50, 50] });
  }, [memos, map]);

  return null;
};

const UserMemoMap = ({ creator, className }: Props) => {
  const creatorFilter = useMemo(() => buildMemoCreatorFilter(creator), [creator]);

  const { data, isLoading } = useInfiniteMemos(
    {
      state: State.NORMAL,
      orderBy: "display_time desc",
      pageSize: 1000,
      filter: creatorFilter,
    },
    { enabled: Boolean(creatorFilter) },
  );

  const memosWithLocation = useMemo(() => data?.pages.flatMap((page) => page.memos).filter((memo) => memo.location) || [], [data]);

  if (isLoading) return null;

  const defaultCenter = { lat: 48.8566, lng: 2.3522 };

  return (
    <div
      className={cn(
        "memo-user-map relative z-0 h-[380px] w-full overflow-hidden rounded-xl border border-border bg-background shadow-sm",
        className,
      )}
    >
      {memosWithLocation.length === 0 && (
        <div className="absolute inset-0 z-[1000] flex items-center justify-center pointer-events-none">
          <div className="flex flex-col items-center gap-1.5 rounded-xl border border-border bg-background/92 px-5 py-3 shadow-sm backdrop-blur-sm">
            <MapPinIcon className="h-5 w-5 text-muted-foreground opacity-70" />
            <p className="text-xs font-medium tracking-[0.02em] text-muted-foreground">No location data found</p>
          </div>
        </div>
      )}

      <div className="pointer-events-none absolute left-4 top-4 z-[950] flex items-start justify-between gap-3 rounded-xl border border-border bg-background/92 px-3 py-2.5 shadow-sm backdrop-blur-sm">
        <div className="flex items-center gap-2">
          <span className="grid size-7 place-items-center rounded-full bg-primary/10 text-primary">
            <MapPinIcon className="size-3.5" />
          </span>
          <div className="min-w-0">
            <p className="text-[11px] font-medium uppercase tracking-[0.18em] text-muted-foreground">Mapped memos</p>
            <p className="text-sm font-semibold text-foreground">{memosWithLocation.length} places pinned</p>
          </div>
        </div>
      </div>

      <MapContainer
        center={defaultCenter}
        zoom={2}
        className="h-full w-full z-0 !bg-muted"
        scrollWheelZoom
        zoomControl={false}
        attributionControl={false}
      >
        <ThemedTileLayer />
        <MarkerClusterGroup
          chunkedLoading
          iconCreateFunction={createClusterCustomIcon}
          maxClusterRadius={40}
          spiderfyOnMaxZoom
          showCoverageOnHover={false}
        >
          {memosWithLocation.map((memo) => (
            <Marker key={memo.name} position={[memo.location!.latitude, memo.location!.longitude]} icon={defaultMarkerIcon}>
              <Popup closeButton={false} className="memo-map-popup w-64!">
                <div className="flex flex-col gap-2.5 p-3">
                  <div className="flex items-start justify-between gap-3">
                    <div className="space-y-1">
                      <span className="inline-flex rounded-full border border-border/70 bg-muted/50 px-2 py-0.5 text-[10px] font-medium uppercase tracking-[0.14em] text-muted-foreground">
                        Memo
                      </span>
                      <span className="block text-[11px] font-medium text-muted-foreground">
                        {memo.displayTime &&
                          timestampDate(memo.displayTime).toLocaleDateString(undefined, {
                            year: "numeric",
                            month: "short",
                            day: "numeric",
                          })}
                      </span>
                    </div>
                    <Link
                      to={`/memos/${memo.name.split("/").pop()}`}
                      className="inline-flex items-center gap-1 rounded-full border border-border bg-background px-2.5 py-1 text-[11px] font-medium text-foreground transition-all hover:border-primary/40 hover:text-primary"
                    >
                      Open
                      <ArrowUpRightIcon className="h-3.5 w-3.5" />
                    </Link>
                  </div>
                  <div className="space-y-1">
                    <div className="line-clamp-3 text-sm leading-snug font-medium text-foreground">{memo.snippet || "No content"}</div>
                    <div className="text-[11px] text-muted-foreground">
                      {memo.location!.latitude.toFixed(2)}°, {memo.location!.longitude.toFixed(2)}°
                    </div>
                  </div>
                </div>
              </Popup>
            </Marker>
          ))}
        </MarkerClusterGroup>
        <MapFitBounds memos={memosWithLocation} />
      </MapContainer>
    </div>
  );
};

export default UserMemoMap;