add geo distance to header

lib/src/Components/Map/Subcomponents/ItemPopupComponents/HeaderView.tsx

@@ -10,7 +10,7 @@
 /* eslint-disable @typescript-eslint/no-non-null-assertion */
 /* eslint-disable @typescript-eslint/no-unsafe-assignment */
 import EllipsisVerticalIcon from '@heroicons/react/16/solid/EllipsisVerticalIcon'
-import { MapPinIcon, ShareIcon, UserPlusIcon } from '@heroicons/react/24/outline'
+import { MapPinIcon, ShareIcon } from '@heroicons/react/24/outline'
 import PencilIcon from '@heroicons/react/24/solid/PencilIcon'
 import TrashIcon from '@heroicons/react/24/solid/TrashIcon'
 import { useState } from 'react'
@@ -20,7 +20,9 @@ import { useNavigate } from 'react-router-dom'
 
 import TargetDotSVG from '#assets/targetDot.svg'
 import { useAppState } from '#components/AppShell/hooks/useAppState'
+import { useGeoDistance } from '#components/Map/hooks/useGeoDistance'
 import { useHasUserPermission } from '#components/Map/hooks/usePermissions'
+import { useGetItemTags } from '#components/Map/hooks/useTags'
 import DialogModal from '#components/Templates/DialogModal'
 
 import type { Item } from '#types/Item'
@@ -56,8 +58,9 @@ export function HeaderView({
   const hasUserPermission = useHasUserPermission()
   const navigate = useNavigate()
   const appState = useAppState()
-
+  const getItemTags = useGetItemTags()
   const [imageLoaded, setImageLoaded] = useState(false)
+  const { distance } = useGeoDistance(item?.position ?? undefined)
 
   const avatar =
     (item?.image && appState.assetsApi.url + item.image + '?width=160&heigth=160') ||
@@ -69,6 +72,11 @@ export function HeaderView({
 
   const params = new URLSearchParams(window.location.search)
 
+  const formatDistance = (dist: number | null): string | null => {
+    if (!dist) return null
+    return dist < 10 ? `${dist.toFixed(1)} km` : `${Math.round(dist)} km`
+  }
+
   const openDeleteModal = async (event: React.MouseEvent<HTMLElement>) => {
     setModalOpen(true)
     event.stopPropagation()
@@ -196,13 +204,28 @@ export function HeaderView({
       </div>
       {big && (
         <div className='tw:flex tw:row tw:mt-2 '>
-          <div className='tw:w-16 tw:text-center tw:font-bold tw:text-primary  '></div>
+          <div className='tw:w-16 tw:text-center tw:font-bold tw:text-primary  '>
+            {' '}
+            {formatDistance(distance) && (
+              <span
+                style={{
+                  color: `${item?.color ?? (item && (getItemTags(item) && getItemTags(item)[0] && getItemTags(item)[0].color ? getItemTags(item)[0].color : (item?.layer?.markerDefaultColor ?? '#000')))}`,
+                }}
+              >
+                {formatDistance(distance)}
+              </span>
+            )}
+          </div>
           <div className='tw:grow'></div>
           <div className=''>
-            <div className='tw:btn tw:btn-sm tw:btn-primary tw:mr-2'>
-              <UserPlusIcon className='tw:w-4' />
+            <button
+              style={{
+                backgroundColor: `${item?.color ?? (item && (getItemTags(item) && getItemTags(item)[0] && getItemTags(item)[0].color ? getItemTags(item)[0].color : (item?.layer?.markerDefaultColor ?? '#000')))}`,
+              }}
+              className='tw:btn tw:text-white tw:btn-sm tw:mr-2 '
+            >
               Follow
-            </div>
+            </button>
             <div className='tw:btn tw:btn-sm tw:mr-2 tw:px-2'>
               <LuNavigation className='tw:h-4 tw:w-4' />
             </div>

lib/src/Components/Map/hooks/useGeoDistance.tsx

@@ -0,0 +1,53 @@
+import { useState, useEffect } from 'react'
+
+import { useMyProfile } from './useMyProfile'
+
+import type { Point } from 'geojson'
+
+const getDistance = (lat1: number, lon1: number, lat2: number, lon2: number): number => {
+  const R = 6371 // Earth's radius in km
+  const dLat = ((lat2 - lat1) * Math.PI) / 180
+  const dLon = ((lon2 - lon1) * Math.PI) / 180
+  const a =
+    Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+    Math.cos((lat1 * Math.PI) / 180) *
+      Math.cos((lat2 * Math.PI) / 180) *
+      Math.sin(dLon / 2) *
+      Math.sin(dLon / 2)
+  const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a))
+  return R * c // Distance in km
+}
+
+export const useGeoDistance = (targetPoint?: Point) => {
+  const [distance, setDistance] = useState<number | null>(null)
+  const [error, setError] = useState<string | null>(null)
+  const { myProfile, isMyProfileLoaded } = useMyProfile()
+
+  useEffect(() => {
+    setError(null)
+    setDistance(null)
+
+    if (!isMyProfileLoaded) {
+      return
+    }
+
+    if (!myProfile?.position || !targetPoint) {
+      setError('Missing location data')
+      return
+    }
+
+    try {
+      const userGeoJson = myProfile.position
+      const [userLon, userLat] = userGeoJson.coordinates
+      const [targetLon, targetLat] = targetPoint.coordinates
+
+      const dist = getDistance(userLat, userLon, targetLat, targetLon)
+      setDistance(dist)
+    } catch (err) {
+      setError('Calculation error')
+      throw err
+    }
+  }, [myProfile, isMyProfileLoaded, targetPoint])
+
+  return { distance, error, userLocation: myProfile?.position as Point | undefined }
+}