Reject training dates that lie in the future

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Reject future training dates
+
 ## [0.4.1] - 2024-05-20
 
 ### Fixed
@@ -110,6 +116,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial version of web app
 
+[Unreleased]: https://github.com/treiher/valens/compare/v0.4.1...HEAD
 [0.4.1]: https://github.com/treiher/valens/compare/v0.4.0...v0.4.1
 [0.4.0]: https://github.com/treiher/valens/compare/v0.3.0...v0.4.0
 [0.3.0]: https://github.com/treiher/valens/compare/v0.2.0...v0.3.0

frontend/src/page/training.rs

@@ -403,7 +403,9 @@ fn view_training_sessions_dialog(
             return empty![];
         }
     }
-    let save_disabled = loading || form.date.1.is_none();
+    let today = Local::now().date_naive();
+    let date_valid = form.date.1.map_or(false, |d| d <= today);
+    let save_disabled = loading || !date_valid;
     common::view_dialog(
         "primary",
         title,
@@ -416,11 +418,12 @@ fn view_training_sessions_dialog(
                     input_ev(Ev::Input, Msg::DateChanged),
                     input![
                         C!["input"],
-                        C![IF![form.date.1.is_none() => "is-danger"]],
+                        C![IF![!date_valid => "is-danger"]],
                         attrs! {
                             At::Type => "date",
                             At::Value => form.date.0,
                             At::Disabled => date_disabled.as_at_value(),
+                            At::Max => today,
                         }
                     ],
                 ]