feat: display error on selection of invalid model (#594)

Up-to-date of #78 

Fixes #32

addressed requested changes @tibo-openai :) made sense to me


though, previous rationale with passing the state up was assuming there
could be a future need to have a shared state with all available models
being available to the parent

codex-cli/src/components/chat/terminal-chat.tsx

@@ -31,6 +31,7 @@ import DiffOverlay from "../diff-overlay.js";
 import HelpOverlay from "../help-overlay.js";
 import HistoryOverlay from "../history-overlay.js";
 import ModelOverlay from "../model-overlay.js";
+import chalk from "chalk";
 import { Box, Text } from "ink";
 import { spawn } from "node:child_process";
 import OpenAI from "openai";
@@ -575,7 +576,7 @@ export default function TerminalChat({
             providers={config.providers}
             currentProvider={provider}
             hasLastResponse={Boolean(lastResponseId)}
-            onSelect={(newModel) => {
+            onSelect={(allModels, newModel) => {
               log(
                 "TerminalChat: interruptAgent invoked – calling agent.cancel()",
               );
@@ -585,6 +586,20 @@ export default function TerminalChat({
               agent?.cancel();
               setLoading(false);
 
+              if (!allModels?.includes(newModel)) {
+                // eslint-disable-next-line no-console
+                console.error(
+                  chalk.bold.red(
+                    `Model "${chalk.yellow(
+                      newModel,
+                    )}" is not available for provider "${chalk.yellow(
+                      provider,
+                    )}".`,
+                  ),
+                );
+                return;
+              }
+
               setModel(newModel);
               setLastResponseId((prev) =>
                 prev && newModel !== model ? null : prev,