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import { useLeafletContext } from '@react-leaflet/core';
import L from 'leaflet';
import markerIconPng from 'leaflet/dist/images/marker-icon.png';
import { useEffect, useContext } from 'react';
import { ApiContext } from '../../utils/api_context';
import { AuthContext } from '../../utils/auth_context';
const userPositionBubble = {
color: 'black',
fillColor: 'black',
fillOpacity: 0.6,
weight: 5,
pmIgnore: true,
radius: 5,
};
const joinable = {
color: 'green',
weight: 1,
pmIgnore: true,
};
const unjoinable = {
color: 'red',
weight: 1,
pmIgnore: true,
};
const editable = {
color: 'blue',
weight: 1,
pmIgnore: false,
};
const icon = new L.Icon({ iconUrl: markerIconPng, iconSize: [25, 41], iconAnchor: [12, 41] });
const haversine = (p1, p2) => {
const degreesToRadians = (degrees) => degrees * (Math.PI / 180);
const delta = { lat: degreesToRadians(p2.lat - p1.lat), lng: degreesToRadians(p2.lng - p1.lng) };
const a =
Math.sin(delta.lat / 2) * Math.sin(delta.lat / 2) +
Math.cos(degreesToRadians(p1.lat)) *
Math.cos(degreesToRadians(p2.lat)) *
Math.sin(delta.lng / 2) *
Math.sin(delta.lng / 2);
const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
const r = 6371 * 1000;
return r * c;
};
// GeoMan code is heavily adapted from this codesandbox: https://codesandbox.io/s/394eq
export const Geoman = ({ user, userPos, joinRoom }) => {
const context = useLeafletContext();
const api = useContext(ApiContext);
const circleAndMarkerFromChatroom = (chatRoom) => {
const circle = new L.Circle(chatRoom.center, chatRoom.radius);
const marker = new L.Marker(chatRoom.center, { pmIgnore: !chatRoom.isEditable, icon });
circle.setStyle(
chatRoom.isEditable
? editable
: haversine(userPos, { lat: chatRoom.latitude, lng: chatRoom.longitude }) < chatRoom.radius
? joinable
: unjoinable,
);
marker.addEventListener('click', () => {
console.log(chatRoom.id);
console.log(haversine(userPos, { lat: chatRoom.latitude, lng: chatRoom.longitude }), chatRoom.radius, userPos);
});
if (!!chatRoom.isEditable) {
[circle, marker].map((x) => {
x.on('pm:edit', (e) => {
const coords = e.target.getLatLng();
marker.setLatLng(coords);
circle.setLatLng(coords);
api.put(`/chat_rooms/${chatRoom.id}`, {
...chatRoom,
latitude: coords.lat,
longitude: coords.lng,
});
});
x.on('pm:remove', (e) => {
context.map.removeLayer(marker);
context.map.removeLayer(circle);
api.del(`/chat_rooms/${chatRoom.id}`);
});
});
circle.on('pm:drag', (e) => {
marker.setLatLng(e.target.getLatLng());
});
marker.on('pm:drag', (e) => {
circle.setLatLng(e.target.getLatLng());
});
}
[circle, marker].map((x) => x.addTo(context.map));
return [circle, marker];
};
const reRender = async () => {
const layersToRemove = [];
context.map.eachLayer((layer) => {
if (layer instanceof L.Circle || layer instanceof L.Marker) {
layersToRemove.push(layer);
}
});
const res = await api.get(`/chat_rooms?lat=${userPos.lat}&lng=${userPos.lng}`);
res.map((x) => {
circleAndMarkerFromChatroom({
center: [x.latitude, x.longitude],
...x,
isEditable: user && x.userId == user.id,
});
});
layersToRemove.map((x) => context.map.removeLayer(x));
const userLocationCircle = new L.Circle(userPos, 5);
userLocationCircle.setStyle(userPositionBubble);
userLocationCircle.addTo(context.map);
};
useEffect(() => {
if (context) {
reRender();
}
}, [userPos]);
useEffect(() => {
const leafletContainer = context.layerContainer || context.map;
leafletContainer.pm.addControls({
drawMarker: false,
editControls: true,
dragMode: true,
cutPolygon: false,
removalMode: true,
rotateMode: false,
splitMode: false,
drawPolyline: false,
drawRectangle: false,
drawPolygon: false,
drawCircleMarker: false,
});
leafletContainer.pm.setGlobalOptions({ pmIgnore: false });
leafletContainer.on('pm:create', async (e) => {
if (e.layer && e.layer.pm) {
const shape = e;
context.map.removeLayer(shape.layer);
const { lat: latitude, lng: longitude } = shape.layer.getLatLng();
const chatRoom = await api.post('/chat_rooms', {
latitude,
longitude,
radius: shape.layer.getRadius(),
});
reRender();
}
});
leafletContainer.on('pm:remove', (e) => {
console.log('object removed');
// console.log(leafletContainer.pm.getGeomanLayers(true).toGeoJSON());
});
return () => {
leafletContainer.pm.removeControls();
leafletContainer.pm.setGlobalOptions({ pmIgnore: true });
};
}, [context]);
return null;
};
export default Geoman;
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