From 810e212b4b255914cfa73e85b52ec23db281c0e3 Mon Sep 17 00:00:00 2001
From: salmonik <salmonik@tuta.io>
Date: Thu, 29 Oct 2026 23:06:22 +0100
Subject: v3.1.0: warn on shrink, but let a live round finish

---
 src/bin/client/repl.rs | 59 ++++++++++++++++++++++++++++++++++++++++++++++++--
 src/client/core.rs     | 22 +++++++++++++++++++
 src/client/ui.rs       | 10 +++++++++
 3 files changed, 89 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/bin/client/repl.rs b/src/bin/client/repl.rs
index 2cf121d..bf02c8d 100644
--- a/src/bin/client/repl.rs
+++ b/src/bin/client/repl.rs
@@ -17,7 +17,7 @@ use zagan_bet::client::core::{ClientCore, Effect, InteractiveCommand, Key};
 use zagan_bet::client::database;
 use zagan_bet::client::ui::{
     display_width, format_pong, host_lines, input_cursor_column, lines_to_move_up,
-    visual_line_count,
+    terminal_size_warning, visual_line_count, MIN_COLUMNS, MIN_ROWS,
 };
 use zagan_bet::protocol::io_failure_message;
 use zagan_bet::roulette::{WHEEL, color as roulette_color};
@@ -36,6 +36,10 @@ pub struct ClientState {
     /// Text last drawn after the `> ` prompt, used to keep the command echo
     /// in the transcript before printing command output.
     prompt_text: String,
+    /// Last known terminal size, updated from resize events.
+    terminal_size: (u16, u16),
+    /// Size we already warned about, so a resize does not spam the transcript.
+    size_warned: Option<(u16, u16)>,
 }
 
 impl ClientState {
@@ -60,6 +64,8 @@ impl ClientState {
             cleanup_done: Arc::new(Mutex::new(false)),
             game_lines: 0,
             prompt_text: String::new(),
+            terminal_size: crossterm::terminal::size().unwrap_or((MIN_COLUMNS, MIN_ROWS)),
+            size_warned: None,
         }
     }
 
@@ -114,7 +120,15 @@ impl ClientState {
                             }
                         }
                     }
-                    Event::Resize(_, _) => self.apply_prompt(),
+                    Event::Resize(columns, rows) => {
+                        self.terminal_size = (columns, rows);
+                        if self.core.is_in_game() {
+                            let effects = self.core.refresh_board();
+                            self.apply_effects(effects);
+                        } else {
+                            self.apply_prompt();
+                        }
+                    }
                     _ => {}
                 }
             }
@@ -130,6 +144,10 @@ impl ClientState {
                 }
             }
 
+            if !quit {
+                quit = self.warn_about_size();
+            }
+
             if quit {
                 break;
             }
@@ -292,7 +310,42 @@ impl ClientState {
         self.prompt_text.clear();
     }
 
+    /// Warn once per size when the terminal is too small and no round is live.
+    /// Inside a game the warning is appended to the board instead, and during a
+    /// live round it is suppressed until the round settles.
+    fn warn_about_size(&mut self) -> bool {
+        let size = self.terminal_size;
+        let Some(message) = terminal_size_warning(size.0, size.1) else {
+            self.size_warned = None;
+            return false;
+        };
+        if self.core.is_in_game() || self.size_warned == Some(size) {
+            return false;
+        }
+        self.size_warned = Some(size);
+        self.apply_effects(vec![Effect::Print(vec![message])]);
+        false
+    }
+
     fn draw_region(&mut self, lines: &[String]) {
+        let warning = if self.core.is_live_game() {
+            None
+        } else {
+            terminal_size_warning(self.terminal_size.0, self.terminal_size.1)
+        };
+        let owned;
+        let lines: &[String] = match warning {
+            Some(warning) => {
+                owned = {
+                    let mut lines = lines.to_vec();
+                    lines.push(warning);
+                    lines
+                };
+                &owned
+            }
+            None => lines,
+        };
+
         if self.game_lines == 0 {
             self.commit_prompt_line();
         } else {
@@ -308,6 +361,8 @@ impl ClientState {
             .map(|line| {
                 if line.starts_with("===") {
                     line.as_str().bold().cyan().to_string()
+                } else if line.starts_with("WARNING:") {
+                    line.as_str().bold().red().to_string()
                 } else if roulette {
                     if line.starts_with("Won ") {
                         line.as_str().bold().green().to_string()
diff --git a/src/client/core.rs b/src/client/core.rs
index 8411d47..95fa050 100644
--- a/src/client/core.rs
+++ b/src/client/core.rs
@@ -138,6 +138,28 @@ impl ClientCore {
         self.game.is_in_game()
     }
 
+    /// True while a round is running and leaving would forfeit a reserved bet.
+    /// The terminal may shrink during one of these without interrupting it.
+    pub fn is_live_game(&self) -> bool {
+        match self
+            .game
+            .get_current_state()
+            .map(|state| state.game_type.as_str())
+        {
+            Some("blackjack") => self
+                .game
+                .blackjack_state()
+                .is_some_and(|hand| hand.phase == "player"),
+            Some("crash") => self.crash_started.is_some(),
+            _ => false,
+        }
+    }
+
+    /// Redraw the current board, for terminal resizes.
+    pub fn refresh_board(&self) -> Vec<Effect> {
+        self.board_effects()
+    }
+
     pub fn prompt_effect(&self) -> Option<Effect> {
         if self.is_in_game() {
             return None;
diff --git a/src/client/ui.rs b/src/client/ui.rs
index 6161166..ca001c2 100644
--- a/src/client/ui.rs
+++ b/src/client/ui.rs
@@ -261,6 +261,16 @@ pub fn terminal_too_small(columns: u16, rows: u16) -> Option<String> {
     ))
 }
 
+/// One-line warning for a terminal that shrank while the client is running.
+pub fn terminal_size_warning(columns: u16, rows: u16) -> Option<String> {
+    if columns >= MIN_COLUMNS && rows >= MIN_ROWS {
+        return None;
+    }
+    Some(format!(
+        "WARNING: terminal is {columns}x{rows}; zagan.bet needs at least {MIN_COLUMNS}x{MIN_ROWS}. Resize to fit."
+    ))
+}
+
 /// Render remembered hosts.
 ///
 /// Two addresses that present the same certificate key are the same server, so
-- 
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