/*
Copyright 2022 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React, { ReactNode, useContext, useEffect, useState } from "react";
import classNames from "classnames";
import * as maplibregl from "maplibre-gl";
import { ClientEvent, IClientWellKnown } from "matrix-js-sdk/src/matrix";
import { logger } from "matrix-js-sdk/src/logger";

import MatrixClientContext from "../../../contexts/MatrixClientContext";
import { useEventEmitterState } from "../../../hooks/useEventEmitter";
import { parseGeoUri, positionFailureMessage } from "../../../utils/location";
import { tileServerFromWellKnown } from "../../../utils/WellKnownUtils";
import { useMap } from "../../../utils/location/useMap";
import { Bounds } from "../../../utils/beacon/bounds";
import Modal from "../../../Modal";
import ErrorDialog from "../dialogs/ErrorDialog";
import { _t } from "../../../languageHandler";

const useMapWithStyle = ({
    id,
    centerGeoUri,
    onError,
    interactive,
    bounds,
    allowGeolocate,
}: {
    id: string;
    centerGeoUri?: string;
    onError?(error: Error): void;
    interactive?: boolean;
    bounds?: Bounds;
    allowGeolocate?: boolean;
}): {
    map: maplibregl.Map | undefined;
    bodyId: string;
} => {
    const bodyId = `mx_Map_${id}`;

    // style config
    const context = useContext(MatrixClientContext);
    const mapStyleUrl = useEventEmitterState(
        context,
        ClientEvent.ClientWellKnown,
        (clientWellKnown: IClientWellKnown) => tileServerFromWellKnown(clientWellKnown)?.["map_style_url"],
    );

    const map = useMap({ interactive, bodyId, onError });

    useEffect(() => {
        if (mapStyleUrl && map) {
            map.setStyle(mapStyleUrl);
        }
    }, [mapStyleUrl, map]);

    useEffect(() => {
        if (map && centerGeoUri) {
            try {
                const coords = parseGeoUri(centerGeoUri);
                if (!coords) {
                    throw new Error("Invalid geo URI");
                }
                map.setCenter({ lon: coords.longitude, lat: coords.latitude });
            } catch (_error) {
                logger.error("Could not set map center");
            }
        }
    }, [map, centerGeoUri]);

    useEffect(() => {
        if (map && bounds) {
            try {
                const lngLatBounds = new maplibregl.LngLatBounds(
                    [bounds.west, bounds.south],
                    [bounds.east, bounds.north],
                );
                map.fitBounds(lngLatBounds, { padding: 100, maxZoom: 15 });
            } catch (_error) {
                logger.error("Invalid map bounds");
            }
        }
    }, [map, bounds]);

    const [geolocate, setGeolocate] = useState<maplibregl.GeolocateControl | null>(null);

    useEffect(() => {
        if (!map) {
            return;
        }
        if (allowGeolocate && !geolocate) {
            const geolocate = new maplibregl.GeolocateControl({
                positionOptions: {
                    enableHighAccuracy: true,
                },
                trackUserLocation: false,
            });
            setGeolocate(geolocate);
            map.addControl(geolocate);
        }
        if (!allowGeolocate && geolocate) {
            map.removeControl(geolocate);
            setGeolocate(null);
        }
    }, [map, geolocate, allowGeolocate]);

    useEffect(() => {
        if (geolocate) {
            geolocate.on("error", onGeolocateError);
            return () => {
                geolocate.off("error", onGeolocateError);
            };
        }
    }, [geolocate]);

    return {
        map,
        bodyId,
    };
};

const onGeolocateError = (e: GeolocationPositionError): void => {
    logger.error("Could not fetch location", e);
    Modal.createDialog(ErrorDialog, {
        title: _t("location_sharing|error_fetch_location"),
        description: positionFailureMessage(e.code) ?? "",
    });
};

export interface MapProps {
    id: string;
    interactive?: boolean;
    /**
     * set map center to geoUri coords
     * Center will only be set to valid geoUri
     * this prop is only simply diffed by useEffect, so to trigger *recentering* of the same geoUri
     * append the uri with a var not used by the geoUri spec
     * eg a timestamp: `geo:54,42;mxTs=123`
     */
    centerGeoUri?: string;
    bounds?: Bounds;
    className?: string;
    allowGeolocate?: boolean;
    onClick?: () => void;
    onError?: (error: Error) => void;
    children?: (renderProps: { map: maplibregl.Map }) => ReactNode;
}

const MapComponent: React.FC<MapProps> = ({
    bounds,
    centerGeoUri,
    children,
    className,
    allowGeolocate,
    id,
    interactive,
    onError,
    onClick,
}) => {
    const { map, bodyId } = useMapWithStyle({ centerGeoUri, onError, id, interactive, bounds, allowGeolocate });

    const onMapClick = (event: React.MouseEvent<HTMLDivElement, MouseEvent>): void => {
        // Eat click events when clicking the attribution button
        const target = event.target as Element;
        if (target.classList.contains("maplibregl-ctrl-attrib-button")) {
            return;
        }

        onClick && onClick();
    };

    return (
        <div className={classNames("mx_Map", className)} id={bodyId} onClick={onMapClick}>
            {!!children && !!map && children({ map })}
        </div>
    );
};

export default MapComponent;