Improve navigation handling in new map app

app/src/frontend/config/category-maps-config.ts

@@ -129,7 +129,7 @@ export const categoryMapsConfig: {[key in Category]: CategoryMapDefinition} = {
         },
     },
     [Category.Sustainability]: {
-        mapStyle: 'sust_Dec',
+        mapStyle: 'sust_dec',
         legend: {
             title: 'Sustainability',
             description: 'DEC Rating',

app/src/frontend/hooks/use-building-data.ts

@@ -1,6 +1,6 @@
 import { useCallback, useEffect, useState } from 'react';
 
-import { Building } from '../models/building';
+import { Building, BuildingAttributeVerificationCounts } from '../models/building';
 import { apiGet } from '../apiHelpers';
 
 export function useBuildingData(buildingId: number, preloadedData: Building): [Building, (updatedBuilding: Building) => void, () => void] {
@@ -29,6 +29,13 @@ export function useBuildingData(buildingId: number, preloadedData: Building): [B
         setIsOld(false);
     }, [buildingId]);
 
+    const updateData = useCallback((building: Building) => {
+        if(building.verified == undefined) {
+            building.verified = {} as BuildingAttributeVerificationCounts;
+        }
+        setBuildingData(building);
+    }, []);
+
     useEffect(() => {
         return () => {
             setIsOld(true);
@@ -43,5 +50,5 @@ export function useBuildingData(buildingId: number, preloadedData: Building): [B
 
     const reloadData = useCallback(() => setIsOld(true), []);
 
-    return [buildingData, setBuildingData, reloadData];
+    return [buildingData, updateData, reloadData];
 }

app/src/frontend/hooks/use-last-not-empty.ts

@@ -1,7 +1,11 @@
-import { usePrevious } from './use-previous';
-
+import { useEffect, useState } from 'react';
 export function useLastNotEmpty<T>(value: T): T {
-    const previousValue = usePrevious(value);
+    const [notEmpty, setNotEmpty] = useState(value);
+    useEffect(() => {
+        if(value != undefined) {
+            setNotEmpty(value);
+        }
+    }, [value]);
 
-    return value ?? previousValue;
+    return notEmpty;
 }

app/src/frontend/hooks/use-previous.ts

@@ -1,10 +0,0 @@
-import { useEffect, useRef } from 'react';
-
-export function usePrevious<T>(value: T) {
-    const ref = useRef<T>();
-    useEffect(() => {
-        ref.current = value;
-    });
-
-    return ref.current;
-}

app/src/frontend/map-app.tsx

@@ -46,14 +46,14 @@ function setOrToggle<T>(currentValue: T, newValue: T): T {
 
 export const MapApp: React.FC<MapAppProps> = props => {
     const [categoryUrlParam] = useUrlCategoryParam();
-    const [selectedBuildingId, setSelectedBuildingId] = useUrlBuildingParam();
-    const [mode] = useUrlModeParam();
 
     const [currentCategory, setCategory] = useState<Category>();
     useEffect(() => setCategory(unless(categoryUrlParam, 'categories')), [categoryUrlParam]);
     
     const displayCategory = useLastNotEmpty(currentCategory) ?? defaultMapCategory;
     
+    const [selectedBuildingId, setSelectedBuildingId] = useUrlBuildingParam('view', displayCategory);
+    
     const [building, updateBuilding, reloadBuilding] = useBuildingData(selectedBuildingId, props.building);
     const [buildingLike, updateBuildingLike] = useBuildingLikeData(selectedBuildingId, props.building_like);
     const [userVerified, updateUserVerified, reloadUserVerified] = useUserVerifiedData(selectedBuildingId, props.user_verified);
@@ -63,13 +63,15 @@ export const MapApp: React.FC<MapAppProps> = props => {
         updateRevisionId(building?.revision_id)
     }, [building]);
     
+    const [mode] = useUrlModeParam();
     const viewEditMode = unless(mode, 'multi-edit');
     
     const [multiEditData, multiEditError] = useMultiEditData();
 
     const selectBuilding = useCallback((selectedBuilding: Building) => {
-        updateBuilding(Object.assign({}, building, selectedBuilding));
-        setSelectedBuildingId(setOrToggle(selectedBuildingId, selectedBuilding?.building_id));
+        const currentId = selectedBuildingId;
+        updateBuilding(selectedBuilding);
+        setSelectedBuildingId(setOrToggle(currentId, selectedBuilding?.building_id));
     }, [selectedBuildingId, setSelectedBuildingId, updateBuilding, building]);
 
     const colourBuilding = useCallback(async (building: Building) => {

app/src/frontend/nav/use-url-building-param.ts

@@ -1,6 +1,7 @@
+import { Category } from '../config/categories-config';
 import { intParamTransform } from './url-param-transform';
 import { useUrlParam } from './use-url-param';
 
-export function useUrlBuildingParam() {
-    return useUrlParam('building', intParamTransform);
+export function useUrlBuildingParam(defaultMode: 'view' | 'edit' | 'multi-edit', defaultCategory: Category | 'categories' = 'categories') {
+    return useUrlParam('building', intParamTransform, '/:mode/:category/:building?', {mode: defaultMode, category: defaultCategory});
 }

app/src/frontend/nav/use-url-param.ts

@@ -5,7 +5,9 @@ import { UrlParamTransform } from './url-param-transform';
 
 export function useUrlParam<T>(
     param: string,
-    paramTransform: UrlParamTransform<T>
+    paramTransform: UrlParamTransform<T>,
+    pathPattern?: string,
+    defaultParams: { [key: string]: string} = {}
 ): [T, (newParam: T) => void] {
     const match = useRouteMatch();
     const history = useHistory();
@@ -19,15 +21,12 @@ export function useUrlParam<T>(
     }, [param, paramTransform, match.url]);
 
     const setUrlParam = useCallback((value: T) => {
-        const stringValue = value == undefined ? '' : paramTransform.toParam(value);
-        const newPath = generatePath(match.path, {
-            ...match.params,
-            ...{
-                [param]: stringValue
-            }
-        });
+        const newParams = Object.assign({}, defaultParams, match.params);
+        newParams[param] = value == undefined ? undefined : paramTransform.toParam(value);
+        
+        const newPath = generatePath(pathPattern ?? match.path, newParams);
         history.push(newPath);
-    }, [param, paramTransform, match.url]);
+    }, [param, paramTransform, pathPattern, defaultParams, match.url]);
 
     return [paramValue, setUrlParam];
 }