UI changes for problems

main.go

@@ -535,7 +535,15 @@ func pageProblems(w http.ResponseWriter, r *http.Request, _ *session.T) { // {{{
 		return
 	}
 
-	problems, err := ProblemsRetrieve(true, timeFrom, timeTo)
+	// GET parameters for this page
+	var selection string
+	if r.URL.Query().Get("selection") == "all" {
+		selection = "ALL"
+	} else {
+		selection = "CURRENT"
+	}
+
+	problems, err := ProblemsRetrieve(selection == "ALL", timeFrom, timeTo)
 	if err != nil {
 		httpError(w, werr.Wrap(err).Log())
 		return
@@ -560,7 +568,9 @@ func pageProblems(w http.ResponseWriter, r *http.Request, _ *session.T) { // {{{
 	page.Data = map[string]any{
 		"Problems":        problems,
 		"ProblemsGrouped": problemsGrouped,
+		"Selection":       selection,
 
+		"TimeHidden": selection == "CURRENT",
 		"TimeSubmit": "/problems",
 		"TimeFrom":   timeFrom.Format("2006-01-02T15:04:05"),
 		"TimeTo":     timeTo.Format("2006-01-02T15:04:05"),