ui(admin): add "working" React admin ui

resources/scripts/state/admin/locations.ts

@@ -0,0 +1,29 @@
+import type { Action } from 'easy-peasy';
+import { action } from 'easy-peasy';
+
+interface AdminLocationStore {
+    selectedLocations: number[];
+
+    setSelectedLocations: Action<AdminLocationStore, number[]>;
+    appendSelectedLocation: Action<AdminLocationStore, number>;
+    removeSelectedLocation: Action<AdminLocationStore, number>;
+}
+
+const locations: AdminLocationStore = {
+    selectedLocations: [],
+
+    setSelectedLocations: action((state, payload) => {
+        state.selectedLocations = payload;
+    }),
+
+    appendSelectedLocation: action((state, payload) => {
+        state.selectedLocations = state.selectedLocations.filter(id => id !== payload).concat(payload);
+    }),
+
+    removeSelectedLocation: action((state, payload) => {
+        state.selectedLocations = state.selectedLocations.filter(id => id !== payload);
+    }),
+};
+
+export type { AdminLocationStore };
+export default locations;