feat: enhance balance calculation to include total balance from all months and exclude sick days

public/js/main.js

@@ -1279,8 +1279,8 @@ async function updateStatistics(entries) {
   // Calculate previous month balance
   const previousBalance = await calculatePreviousBalance();
   
-  // Total balance = previous balance + current month balance
-  const totalBalance = previousBalance + balance;
+  // Total balance = all months from first entry up to today (independent of displayed month)
+  const totalBalance = await calculateTotalBalance();
   
   // Count actual work entries (excluding vacation/flextime/sickday, only up to today)
   const workEntriesCount = entries.filter(e => {
@@ -1513,10 +1513,11 @@ async function addBridgeDaysAsVacation(days) {
 
 /**
  * Calculate balance from all previous months (starting from first month with entries)
+ * up to (but not including) the given month. Defaults to the currently displayed month.
  */
-async function calculatePreviousBalance() {
-  const currentYear = displayYear;
-  const currentMonth = displayMonth;
+async function calculatePreviousBalance(upToYear, upToMonth) {
+  const currentYear = (upToYear !== undefined) ? upToYear : displayYear;
+  const currentMonth = (upToMonth !== undefined) ? upToMonth : displayMonth;
   
   // Find the first month with any entries by checking all entries
   const allEntries = await fetchEntries();
@@ -1576,6 +1577,13 @@ async function calculatePreviousBalance() {
         .map(e => e.date)
     );
     
+    // Count sick days to exclude from workdays
+    const sickDays = new Set(
+      entries
+        .filter(e => e.entryType === 'sickday')
+        .map(e => e.date)
+    );
+    
     // Count flextime days (they are workdays with 0 hours worked)
     const flextimeDays = new Set(
       entries
@@ -1599,8 +1607,8 @@ async function calculatePreviousBalance() {
       const dateISO = `${year}-${month}-${dayStr}`;
       
       if (!isWeekendOrHoliday(dateObj)) {
-        // Exclude vacation days from workdays count
-        if (!vacationDays.has(dateISO)) {
+        // Exclude vacation and sick days from workdays count
+        if (!vacationDays.has(dateISO) && !sickDays.has(dateISO)) {
           workdaysPassed++;
         }
       } else if (flextimeDays.has(dateISO)) {
@@ -1629,6 +1637,58 @@ async function calculatePreviousBalance() {
   return totalBalance;
 }
 
+/**
+ * Calculate the total balance from first entry up to and including the displayed month.
+ * For the current or future months the calculation is capped at today.
+ */
+async function calculateTotalBalance() {
+  const today = new Date();
+  today.setHours(0, 0, 0, 0);
+
+  // End of the displayed month
+  const displayedMonthEnd = new Date(displayYear, displayMonth + 1, 0);
+  displayedMonthEnd.setHours(0, 0, 0, 0);
+
+  // Effective cut-off: end of displayed month, but never beyond today
+  const effectiveCutoff = displayedMonthEnd < today ? displayedMonthEnd : today;
+  const effectiveYear = effectiveCutoff.getFullYear();
+  const effectiveMonth = effectiveCutoff.getMonth();
+
+  // All months before the effective month
+  const previousBalance = await calculatePreviousBalance(effectiveYear, effectiveMonth);
+
+  // Add the effective month up to the effective cut-off date
+  const firstDay = `${effectiveYear}-${String(effectiveMonth + 1).padStart(2, '0')}-01`;
+  const lastDayNum = new Date(effectiveYear, effectiveMonth + 1, 0).getDate();
+  const lastDayStr = `${effectiveYear}-${String(effectiveMonth + 1).padStart(2, '0')}-${String(lastDayNum).padStart(2, '0')}`;
+  const entries = await fetchEntries(firstDay, lastDayStr);
+
+  const vacationDays = new Set(entries.filter(e => e.entryType === 'vacation').map(e => e.date));
+  const sickDays = new Set(entries.filter(e => e.entryType === 'sickday').map(e => e.date));
+  const flextimeDays = new Set(entries.filter(e => e.entryType === 'flextime').map(e => e.date));
+
+  let workdaysPassed = 0;
+  for (let day = 1; day <= lastDayNum; day++) {
+    const dateObj = new Date(effectiveYear, effectiveMonth, day);
+    dateObj.setHours(0, 0, 0, 0);
+    if (dateObj > effectiveCutoff) break;
+    const dateISO = `${effectiveYear}-${String(effectiveMonth + 1).padStart(2, '0')}-${String(day).padStart(2, '0')}`;
+    if (!isWeekendOrHoliday(dateObj)) {
+      if (!vacationDays.has(dateISO) && !sickDays.has(dateISO)) workdaysPassed++;
+    } else if (flextimeDays.has(dateISO)) {
+      workdaysPassed++;
+    }
+  }
+
+  const targetHours = workdaysPassed * 8;
+  const actualHours = entries.reduce((sum, entry) => sum + entry.netHours, 0);
+  const monthBalance = actualHours - targetHours;
+
+  const total = previousBalance + monthBalance;
+  console.log(`calculateTotalBalance: displayed=${displayYear}-${displayMonth + 1}, cutoff=${effectiveYear}-${effectiveMonth + 1}, previousBalance=${previousBalance.toFixed(1)}h, effectiveMonth=${monthBalance.toFixed(1)}h, total=${total.toFixed(1)}h`);
+  return total;
+}
+
 /**
  * Open modal for adding/editing entry
  */