import { LatLng } from "leaflet";
import { MapPinIcon, XIcon } from "lucide-react";
import { useEffect, useState, useRef } from "react";
import toast from "react-hot-toast";
import LeafletMap from "@/components/LeafletMap";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "@/components/ui/tooltip";
import { Location } from "@/types/proto/api/v1/memo_service";
import { useTranslate } from "@/utils/i18n";

interface Props {
  location?: Location;
  onChange: (location?: Location) => void;
}

interface State {
  initilized: boolean;
  placeholder: string;
  position?: LatLng;
}

interface NominatimRateLimit {
  lastNominatimFetch: Date;
  nominatimTimeoutId: number | undefined;
  timeBetweenFetch: number;
}

const LocationSelector = (props: Props) => {
  const t = useTranslate();
  const [state, setState] = useState<State>({
    initilized: false,
    placeholder: props.location?.placeholder || "",
    position: props.location ? new LatLng(props.location.latitude, props.location.longitude) : undefined,
  });
  const rateLimit = useRef<NominatimRateLimit>({
    lastNominatimFetch: new Date(0),
    nominatimTimeoutId: undefined,
    timeBetweenFetch: 1300,
  });

  const [popoverOpen, setPopoverOpen] = useState<boolean>(false);

  useEffect(() => {
    setState((state) => ({
      ...state,
      placeholder: props.location?.placeholder || "",
      position: new LatLng(props.location?.latitude || 0, props.location?.longitude || 0),
    }));
  }, [props.location]);

  useEffect(() => {
    if (popoverOpen && !props.location) {
      const handleError = (error: any, errorMessage: string) => {
        setState({ ...state, initilized: true });
        toast.error(errorMessage);
        console.error(error);
      };

      if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(
          (position) => {
            const lat = position.coords.latitude;
            const lng = position.coords.longitude;
            setState({ ...state, position: new LatLng(lat, lng), initilized: true });
          },
          (error) => {
            handleError(error, "Failed to get current position");
          },
        );
      } else {
        handleError("Geolocation is not supported by this browser.", "Geolocation is not supported by this browser.");
      }
    }
  }, [popoverOpen]);

  const updateReverseGeocoding = () => {
    if (!state.position) {
      setState({ ...state, placeholder: "" });
      return;
    }

    fetch(`https://nominatim.openstreetmap.org/reverse?lat=${state.position.lat}&lon=${state.position.lng}&format=json`, {
      cache: "default",
      headers: new Headers({ "Cache-Control": "max-age=86400" }),
    })
      .then((response) => response.json())
      .then((data) => {
        if (data && data.display_name) {
          setState({ ...state, placeholder: data.display_name });
        }
      })
      .catch((error) => {
        toast.error("Failed to fetch reverse geocoding data");
        console.error("Failed to fetch reverse geocoding data:", error);
      });
  };

  useEffect(() => {
    // Fetch reverse geocoding with rate limits
    clearTimeout(rateLimit.current.nominatimTimeoutId);
    const timeLeft = rateLimit.current.timeBetweenFetch - (new Date().getTime() - rateLimit.current.lastNominatimFetch.getTime());
    rateLimit.current.nominatimTimeoutId = setTimeout(() => {
      updateReverseGeocoding();
      rateLimit.current.lastNominatimFetch = new Date();
    }, Math.max(0, timeLeft));
  }, [state.position]);

  const onPositionChanged = (position: LatLng) => {
    setState({ ...state, position });
  };

  const removeLocation = (e: React.MouseEvent) => {
    e.stopPropagation();
    e.preventDefault();
    props.onChange(undefined);
  };

  return (
    <Popover open={popoverOpen} onOpenChange={setPopoverOpen}>
      <TooltipProvider>
        <Tooltip>
          <TooltipTrigger asChild>
            <PopoverTrigger asChild>
              <Button variant="ghost" size={props.location ? undefined : "icon"}>
                <MapPinIcon className="size-5 shrink-0" />
                {props.location && (
                  <>
                    <span className="ml-0.5 text-sm text-ellipsis whitespace-nowrap overflow-hidden max-w-28">
                      {props.location.placeholder}
                    </span>
                    <span className="ml-1 cursor-pointer hover:text-primary" onClick={removeLocation}>
                      <XIcon className="size-4 shrink-0" />
                    </span>
                  </>
                )}
              </Button>
            </PopoverTrigger>
          </TooltipTrigger>
          {!props.location && (
            <TooltipContent side="bottom">
              <p>{t("tooltip.select-location")}</p>
            </TooltipContent>
          )}
        </Tooltip>
      </TooltipProvider>
      <PopoverContent align="center">
        <div className="min-w-80 sm:w-lg p-1 flex flex-col justify-start items-start">
          <LeafletMap key={JSON.stringify(state.initilized)} latlng={state.position} onChange={onPositionChanged} />
          <div className="mt-2 w-full flex flex-row justify-between items-center gap-2">
            <div className="flex flex-row items-center justify-start gap-2 w-full">
              <div className="relative flex-1">
                {state.position && (
                  <div className="absolute left-2 top-1/2 -translate-y-1/2 text-xs leading-6 opacity-60 z-10">
                    [{state.position.lat.toFixed(2)}, {state.position.lng.toFixed(2)}]
                  </div>
                )}
                <Input
                  placeholder="Choose a position first."
                  value={state.placeholder}
                  disabled={!state.position}
                  className={state.position ? "pl-24" : ""}
                  onChange={(e) => setState((state) => ({ ...state, placeholder: e.target.value }))}
                />
              </div>
            </div>
            <Button
              className="shrink-0"
              color="primary"
              onClick={() => {
                props.onChange(
                  Location.fromPartial({
                    placeholder: state.placeholder,
                    latitude: state.position?.lat,
                    longitude: state.position?.lng,
                  }),
                );
                setPopoverOpen(false);
              }}
              disabled={!state.position || state.placeholder.length === 0}
            >
              {t("common.confirm")}
            </Button>
          </div>
        </div>
      </PopoverContent>
    </Popover>
  );
};

export default LocationSelector;
