admin functionality

ht_booking/src/controllers/calendar.rs

@@ -86,6 +86,9 @@ pub struct CalendarPage {
     pub prev_week: String,
     pub this_week: String,
     pub next_week: String,
+    /// `false` on the public calendar once it reaches the two-week look-back
+    /// limit, which disables the "previous week" button. Always `true` for admin.
+    pub can_prev: bool,
     pub days: Vec<DayHead>,
     pub rows: Vec<Row>,
 }
@@ -185,6 +188,10 @@ pub async fn build_calendar(
         .unwrap_or_default();
 
     let monday = week_monday(q_week.as_deref());
+    // The public calendar may look back at most two weeks; the admin has no limit.
+    let min_monday = monday_of(Utc::now().date_naive()) - Duration::weeks(2);
+    let monday = if is_admin { monday } else { monday.max(min_monday) };
+    let can_prev = is_admin || monday > min_monday;
     let sunday = monday + Duration::days(6);
 
     let days: Vec<DayHead> = (0..7i64)
@@ -269,6 +276,7 @@ pub async fn build_calendar(
             .format("%Y-%m-%d")
             .to_string(),
         next_week: (monday + Duration::days(7)).format("%Y-%m-%d").to_string(),
+        can_prev,
         days,
         rows,
     })