From 7aac1060bde1b3d3eecf296ac577ac1692e69742 Mon Sep 17 00:00:00 2001
From: "Ahmad K. Bawaneh" <ahmad.bawaneh@dominokit.com>
Date: Thu, 2 Nov 2023 12:12:45 +0300
Subject: [PATCH] fix #873 Calendar - set first day of week in accordance with
 DateTimeFormatInfo

---
 domino-ui/pom.xml                             |  6 -----
 .../domino/ui/datepicker/CalendarMonth.java   | 22 ++++++++++++++-----
 2 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/domino-ui/pom.xml b/domino-ui/pom.xml
index 30bd62a82..655e1d89b 100644
--- a/domino-ui/pom.xml
+++ b/domino-ui/pom.xml
@@ -126,14 +126,8 @@
 
                             <cssExcludes>
                                 <cssExclude>domino-ui.css</cssExclude>
-                                <!--                                <cssExclude>domino-ui-domino-ui-colors.css</cssExclude>-->
                                 <cssExclude>loaders/domino-ui-waitMe.css</cssExclude>
-                                <!--                                <cssExclude>domino-ui-grid.css</cssExclude>-->
-                                <!--                                <cssExclude>material-icons.css</cssExclude>-->
                                 <cssExclude>**/*.min.css</cssExclude>
-                                <!--                                <cssExclude>**/themes/*.css</cssExclude>-->
-                                <!--                                <cssExclude>domino-ui-waves.css</cssExclude>-->
-                                <!--                                <cssExclude>domino-ui-style.css</cssExclude>-->
                             </cssExcludes>
 
                             <webappSourceDir>${build.directory}/classes</webappSourceDir>
diff --git a/domino-ui/src/main/java/org/dominokit/domino/ui/datepicker/CalendarMonth.java b/domino-ui/src/main/java/org/dominokit/domino/ui/datepicker/CalendarMonth.java
index 19ad92633..fcb9d8830 100644
--- a/domino-ui/src/main/java/org/dominokit/domino/ui/datepicker/CalendarMonth.java
+++ b/domino-ui/src/main/java/org/dominokit/domino/ui/datepicker/CalendarMonth.java
@@ -76,6 +76,7 @@ private void setDate(Date date) {
 
   private void updateView() {
     this.root.clearElement();
+    int firstDayOfTheWeek = this.calendar.getDateTimeFormatInfo().firstDayOfTheWeek();
     Date tempDate = new Date(this.date.getYear(), this.date.getMonth(), 1);
 
     int monthFirstDay = tempDate.getDay() == 0 ? 7 : tempDate.getDay();
@@ -85,17 +86,26 @@ private void updateView() {
             .addCss(dui_month_days_header)
             .apply(
                 daysHeader -> {
-                  for (int i = 0; i < 7; i++) {
-                    daysHeader.appendChild(WeekDayHeader.create(this.calendar, i));
+                  int index = firstDayOfTheWeek;
+                  while (index != -1) {
+                    daysHeader.appendChild(WeekDayHeader.create(this.calendar, index));
+                    index = index + 1;
+                    if (index > 6) {
+                      index = 0;
+                    }
+                    if (index == firstDayOfTheWeek) {
+                      index = -1;
+                    }
                   }
                 }));
     this.monthData = new MonthData(this.date);
     MonthData monthBefore = monthData.getMonthBefore();
     MonthData monthAfter = monthData.getMonthAfter();
 
-    int diff = monthFirstDay + 1;
+    int offset = Math.abs(monthFirstDay - firstDayOfTheWeek);
+    int diff = offset + 1;
     int[] currentDaysCounter = new int[] {0};
-    int[] monthBeforeDaysCounter = new int[] {monthBefore.getDaysCount() - monthFirstDay + 1};
+    int[] monthBeforeDaysCounter = new int[] {monthBefore.getDaysCount() - offset + 1};
     int[] monthAfterDaysCounter = new int[] {1};
 
     int[] index = new int[] {0};
@@ -107,7 +117,7 @@ private void updateView() {
                   daysRow -> {
                     for (int day = 0; day < 7; day++) {
                       CalendarDay calendarDay;
-                      if (index[0] < monthFirstDay) {
+                      if (index[0] < offset) {
                         calendarDay =
                             CalendarDay.create(
                                 this.calendar,
@@ -118,7 +128,7 @@ private void updateView() {
                                 day,
                                 false);
                         monthBeforeDaysCounter[0] = monthBeforeDaysCounter[0] + 1;
-                      } else if (index[0] >= monthFirstDay
+                      } else if (index[0] >= offset
                           && index[0] < (monthData.getDaysCount() + diff - 1)) {
                         calendarDay =
                             CalendarDay.create(