fix performance from useCoins

lib/atoms.ts

@@ -5,8 +5,83 @@ import {
   getDefaultCoinsData,
   getDefaultWishlistData
 } from "./types";
+import { getTodayInTimezone, isSameDate, t2d } from "@/lib/utils";
 
 export const settingsAtom = atom(getDefaultSettings());
 export const habitsAtom = atom(getDefaultHabitsData());
 export const coinsAtom = atom(getDefaultCoinsData());
 export const wishlistAtom = atom(getDefaultWishlistData());
+
+// Derived atom for coins earned today
+export const coinsEarnedTodayAtom = atom((get) => {
+  const coins = get(coinsAtom);
+  const settings = get(settingsAtom);
+  const today = getTodayInTimezone(settings.system.timezone);
+  return coins.transactions
+    .filter(transaction =>
+      isSameDate(t2d({ timestamp: transaction.timestamp, timezone: settings.system.timezone }),
+        t2d({ timestamp: today, timezone: settings.system.timezone }))
+    )
+    .reduce((sum, transaction) => {
+      if (transaction.type !== 'HABIT_UNDO' && transaction.amount > 0) {
+        return sum + transaction.amount;
+      }
+      if (transaction.type === 'HABIT_UNDO') {
+        return sum - Math.abs(transaction.amount);
+      }
+      return sum;
+    }, 0);
+});
+
+// Derived atom for total earned
+export const totalEarnedAtom = atom((get) => {
+  const coins = get(coinsAtom);
+  return coins.transactions
+    .filter(t => {
+      if (t.type === 'HABIT_COMPLETION' && t.relatedItemId) {
+        return !coins.transactions.some(undoT =>
+          undoT.type === 'HABIT_UNDO' &&
+          undoT.relatedItemId === t.relatedItemId
+        );
+      }
+      return t.amount > 0 && t.type !== 'HABIT_UNDO';
+    })
+    .reduce((sum, t) => sum + t.amount, 0);
+});
+
+// Derived atom for total spent
+export const totalSpentAtom = atom((get) => {
+  const coins = get(coinsAtom);
+  return Math.abs(
+    coins.transactions
+      .filter(t => t.type === 'WISH_REDEMPTION' || t.type === 'MANUAL_ADJUSTMENT')
+      .reduce((sum, t) => sum + (t.amount < 0 ? t.amount : 0), 0)
+  );
+});
+
+// Derived atom for coins spent today
+export const coinsSpentTodayAtom = atom((get) => {
+  const coins = get(coinsAtom);
+  const settings = get(settingsAtom);
+  const today = getTodayInTimezone(settings.system.timezone);
+  return Math.abs(
+    coins.transactions
+      .filter(t =>
+        isSameDate(t2d({ timestamp: t.timestamp, timezone: settings.system.timezone }),
+          t2d({ timestamp: today, timezone: settings.system.timezone })) &&
+        t.amount < 0
+      )
+      .reduce((sum, t) => sum + t.amount, 0)
+  );
+});
+
+// Derived atom for transactions today
+export const transactionsTodayAtom = atom((get) => {
+  const coins = get(coinsAtom);
+  const settings = get(settingsAtom);
+  const today = getTodayInTimezone(settings.system.timezone);
+  return coins.transactions.filter(t =>
+    isSameDate(t2d({ timestamp: t.timestamp, timezone: settings.system.timezone }),
+      t2d({ timestamp: today, timezone: settings.system.timezone }))
+  ).length;
+});