added suspense for home page

app/ui/HomePage.tsx

@@ -0,0 +1,77 @@
+import { fetchAllLocations } from '@/app/lib/actions/locationActions';
+import { fetchAvailableYears } from '@/app/lib/actions/monthActions';
+import { BillingLocation, YearMonth } from '@/app/lib/db-types';
+import { FC } from 'react';
+import { MonthLocationList } from '@/app/ui/MonthLocationList';
+
+export interface HomePageProps {
+  searchParams?: {
+    year?: string;
+    month?: string;
+  };
+}
+
+export const HomePage:FC<HomePageProps> = async ({ searchParams }) => {
+
+  let availableYears: number[];
+
+  const asyncTimout = (ms:number) => new Promise(resolve => setTimeout(resolve, ms));
+
+  await asyncTimout(5000);
+
+  try {
+    availableYears = await fetchAvailableYears();
+  } catch (error:any) {
+    return (
+      <main className="flex min-h-screen flex-col p-6 bg-base-300">
+        <p className="text-center text-2xl text-red-500">{error.message}</p>
+      </main>);
+  }
+
+  // if the database is in it's initial state, show the add location button for the current month
+  if(availableYears.length === 0) {
+    return (<MonthLocationList />);
+  }
+
+  const currentYear = Number(searchParams?.year) || availableYears[0];
+  
+  const locations = await fetchAllLocations(currentYear);
+
+  // group locations by month
+  const months = locations.reduce((acc, location) => {
+    const {year, month} =  location.yearMonth;
+    const key = `${year}-${month}`;
+
+    const locationsInMonth = acc[key];
+
+    if(locationsInMonth) {
+      return({
+        ...acc,
+        [key]: {
+          yearMonth: location.yearMonth,
+          locations: [...locationsInMonth.locations, location],
+          monthlyExpense: locationsInMonth.monthlyExpense + location.bills.reduce((acc, bill) => bill.paid ? acc + (bill.payedAmount ?? 0) : acc, 0)
+        }
+      })
+    }
+
+    return({
+      ...acc,
+      [key]: {
+        yearMonth: location.yearMonth,
+        locations: [location],
+        monthlyExpense: location.bills.reduce((acc, bill) => bill.paid ? acc + (bill.payedAmount ?? 0) : acc, 0)
+      }
+    });
+  }, {} as {[key:string]:{
+    yearMonth: YearMonth,
+    locations: BillingLocation[],
+    monthlyExpense: number
+  } });
+
+ return (
+    <MonthLocationList availableYears={availableYears} months={months} />
+  );
+}
+
+export default HomePage;

app/ui/MonthCardSceleton.tsx

@@ -0,0 +1,32 @@
+import { Cog8ToothIcon, PlusCircleIcon } from "@heroicons/react/24/outline";
+import React from "react"
+
+const LocationCardSkeleton: React.FC = () =>
+<div className={`skeleton card card-compact card-bordered max-w-[30em] bg-base-100 shadow-s my-1`}>
+    <div className="card-body">
+        <h2 className="card-title mr-[2em]"></h2>
+    </div>
+</div>;
+
+export interface MonthCardSkeletonProps {
+    checked?: boolean;
+}
+
+export const MonthCardSkeleton: React.FC<MonthCardSkeletonProps> = ({checked=false}) =>
+    <div className={`skeleton collapse collapse-plus bg-base-200 my-1`}>
+      <input type="checkbox" name="my-accordion-3" checked={checked} disabled />
+      <div className="collapse-title text-xl font-medium w-[15em]">
+      </div>
+      <div className="collapse-content">
+        <LocationCardSkeleton />
+        <LocationCardSkeleton />
+      </div>
+    </div>;
+
+
+export const HomePageSkeleton: React.FC = () =>
+<>
+    <MonthCardSkeleton checked={true} />
+    <MonthCardSkeleton />
+    <MonthCardSkeleton />
+</>;

app/ui/MonthLocationList.tsx

@@ -18,8 +18,8 @@ const getNextYearMonth = (yearMonth:YearMonth) => {
 }
 
 export interface MonthLocationListProps {
-    availableYears: number[];
-    months: {
+    availableYears?: number[];
+    months?: {
         [key: string]: {
             yearMonth: YearMonth;
             locations: BillingLocation[];
@@ -36,6 +36,20 @@ export const MonthLocationList:React.FC<MonthLocationListProps  > = ({
     const router = useRouter();
     const params = useParams();
 
+    if(!availableYears || !months) {
+        const currentYearMonth:YearMonth = {
+            year: new Date().getFullYear(),
+            month: new Date().getMonth() + 1
+          };
+      
+        return(
+            <>
+            <MonthCard yearMonth={currentYearMonth} key={`month-${currentYearMonth}`} monthlyExpense={0} onToggle={() => {}}>
+                <AddLocationButton yearMonth={currentYearMonth} />
+            </MonthCard>
+        </>)
+    };
+
     const { month: initialMonth } = params;
     
     const [expandedMonth, setExpandedMonth] = React.useState<number>(