Update for Sally

Added Freeze Day

src/lib/storage.js

@@ -65,12 +65,15 @@ export const toggleCompletion = (habitId, dateStr) => {
   });
 };
 
+import { getFrozenDays } from './utils-habit.js';
 const calculateStreaks = (completions) => {
   if (completions.length === 0) {
     return { currentStreak: 0, longestStreak: 0 };
   }
-
-  const sortedDates = completions
+  // Only use frozen days for streak calculation
+  const frozenDays = getFrozenDays(completions);
+  const allValid = Array.from(new Set([...completions, ...frozenDays]));
+  const sortedDates = allValid
     .map(d => new Date(d))
     .sort((a, b) => b - a);
 
@@ -88,15 +91,12 @@ const calculateStreaks = (completions) => {
 
   if (mostRecent.getTime() === today.getTime() || mostRecent.getTime() === yesterday.getTime()) {
     currentStreak = 1;
-
     for (let i = 1; i < sortedDates.length; i++) {
       const current = new Date(sortedDates[i]);
       current.setHours(0, 0, 0, 0);
       const previous = new Date(sortedDates[i - 1]);
       previous.setHours(0, 0, 0, 0);
-
       const diffDays = Math.floor((previous - current) / (1000 * 60 * 60 * 24));
-
       if (diffDays === 1) {
         currentStreak++;
         tempStreak++;
@@ -112,9 +112,7 @@ const calculateStreaks = (completions) => {
     current.setHours(0, 0, 0, 0);
     const previous = new Date(sortedDates[i - 1]);
     previous.setHours(0, 0, 0, 0);
-
     const diffDays = Math.floor((previous - current) / (1000 * 60 * 60 * 24));
-
     if (diffDays === 1) {
       tempStreak++;
       longestStreak = Math.max(longestStreak, tempStreak);
@@ -124,9 +122,8 @@ const calculateStreaks = (completions) => {
   }
 
   longestStreak = Math.max(longestStreak, currentStreak, 1);
-
   return { currentStreak, longestStreak };
-};
+}
 
 export const exportData = () => {
   const habits = getHabits();

src/lib/utils-habit.js

@@ -39,4 +39,38 @@ export const getColorIntensity = (completions, dateStr) => {
 export const getWeekdayLabel = (dayIndex) => {
   const labels = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
   return labels[dayIndex];
-};
+};
+  // Returns array of frozen days (date strings) for a given completions array
+  export function getFrozenDays(completions) {
+    // Map: month string -> frozen day string
+    const frozenDays = [];
+    const completedSet = new Set(completions);
+    // Sort completions for easier lookup
+    const sorted = [...completions].sort();
+    // Track frozen per month
+    const frozenPerMonth = {};
+    // To find missed days, scan a range of dates
+    if (completions.length === 0) return [];
+    const minDate = new Date(sorted[0]);
+    const maxDate = new Date(sorted[sorted.length - 1]);
+    for (let d = new Date(minDate); d <= maxDate; d.setDate(d.getDate() + 1)) {
+      const dateStr = formatDate(d);
+      if (completedSet.has(dateStr)) continue; // skip completed days
+      // Check neighbors
+      const prevDate = new Date(d); prevDate.setDate(prevDate.getDate() - 1);
+      const nextDate = new Date(d); nextDate.setDate(nextDate.getDate() + 1);
+      const prevDateStr = formatDate(prevDate);
+      const nextDateStr = formatDate(nextDate);
+      // Only freeze if both neighbors are completed
+      const monthKey = `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}`;
+      if (
+        completedSet.has(prevDateStr) &&
+        completedSet.has(nextDateStr) &&
+        !frozenPerMonth[monthKey]
+      ) {
+        frozenDays.push(dateStr);
+        frozenPerMonth[monthKey] = true;
+      }
+    }
+    return frozenDays;
+  }