From a22e8c4d85c5b0258545771f34c197f8dc1ad2f4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Sun, 16 Oct 2022 22:23:13 +0200
Subject: Validate that submitted event doesn't have invalid interval.

---
 module/vcomponent/util/instance/methods.scm |  3 +++
 module/vcomponent/validate.scm              | 16 ++++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 module/vcomponent/validate.scm

diff --git a/module/vcomponent/util/instance/methods.scm b/module/vcomponent/util/instance/methods.scm
index 28b664c6..f1c6ecf0 100644
--- a/module/vcomponent/util/instance/methods.scm
+++ b/module/vcomponent/util/instance/methods.scm
@@ -174,6 +174,9 @@
 
 
 (define-method (add-and-save-event (this <events>) calendar event)
+
+  ((@ (vcomponent validate) validate-event) event)
+
   (cond
    [(get-event-by-uid this (prop event 'UID))
     => (lambda (old-event)
diff --git a/module/vcomponent/validate.scm b/module/vcomponent/validate.scm
new file mode 100644
index 00000000..8881c95f
--- /dev/null
+++ b/module/vcomponent/validate.scm
@@ -0,0 +1,16 @@
+(define-module (vcomponent validate)
+  :use-module (vcomponent)
+  :use-module (datetime)
+  :use-module ((hnh util exceptions)
+               :select (warning))
+  :use-module (calp translation)
+  :export (validate-event))
+
+(define (validate-event component)
+  (unless (date/-time<=
+           (prop component 'DTSTART)
+           (prop component 'DTEND))
+    (warning (G_ "end (~a) must be equal to or greater than start (~a)")
+             (prop component 'DTEND)
+             (prop component 'DTSTART)))
+  )
-- 
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