Added main functionality

apk/context/birthdays-context.tsx

@@ -2,10 +2,13 @@ import {
   createContext,
   ReactNode,
   useContext,
+  useEffect,
   useMemo,
   useState,
 } from "react";
+import AsyncStorage from "@react-native-async-storage/async-storage";
 
+import { syncBirthdayNotifications } from "@/utils/birthday-notifications";
 export interface BirthdayEntry {
   id: string;
   name: string;
@@ -20,14 +23,70 @@ interface AddBirthdayInput {
 interface BirthdaysContextValue {
   birthdays: BirthdayEntry[];
   addBirthday: (input: AddBirthdayInput) => void;
+  deleteBirthday: (id: string) => void;
 }
 
+const STORAGE_KEY = "birthdays";
+
 const BirthdaysContext = createContext<BirthdaysContextValue | undefined>(
   undefined
 );
 
 export function BirthdaysProvider({ children }: { children: ReactNode }) {
   const [birthdays, setBirthdays] = useState<BirthdayEntry[]>([]);
+  const [isLoaded, setIsLoaded] = useState(false);
+
+  // Load birthdays on app start from storage
+  useEffect(() => {
+    const loadBirthdays = async () => {
+      try {
+        const stored = await AsyncStorage.getItem(STORAGE_KEY);
+        if (stored) {
+          setBirthdays(JSON.parse(stored));
+        }
+      } catch(e) {
+        console.log("Error loading birthdays", e);
+      } finally {
+        setIsLoaded(true);
+      }
+    };
+
+    loadBirthdays();
+  }, []);
+
+  // Save birthdays whenever they change
+  useEffect(() => {
+    if (!isLoaded) return;
+
+    const saveBirthdays = async () => {
+      try {
+        await AsyncStorage.setItem(
+          STORAGE_KEY,
+          JSON.stringify(birthdays)
+        );
+      } catch(e) {
+        console.log("Error saving birthdays", e);
+      }
+    };
+
+    saveBirthdays();
+  }, [birthdays, isLoaded]);
+
+  useEffect(() => {
+    if (!isLoaded) {
+      return;
+    }
+
+    const synchronizeNotifications = async () => {
+      try {
+        await syncBirthdayNotifications(birthdays);
+      } catch (error) {
+        console.log("Error syncing birthday notifications", error);
+      }
+    };
+
+    synchronizeNotifications();
+  }, [birthdays, isLoaded]);
 
   const value = useMemo(
     () => ({
@@ -48,6 +107,11 @@ export function BirthdaysProvider({ children }: { children: ReactNode }) {
           },
         ]);
       },
+      deleteBirthday: (id: string) => {
+        setBirthdays((currentBirthdays) =>
+          currentBirthdays.filter((birthday) => birthday.id !== id)
+        );
+      },
     }),
     [birthdays]
   );