Revert "ai: Auto select user model when there's no default" (#36932)

Reverts zed-industries/zed#36722

Release Notes:

- N/A

crates/agent_ui/src/language_model_selector.rs

@@ -6,7 +6,8 @@ use feature_flags::ZedProFeatureFlag;
 use fuzzy::{StringMatch, StringMatchCandidate, match_strings};
 use gpui::{Action, AnyElement, App, BackgroundExecutor, DismissEvent, Subscription, Task};
 use language_model::{
-    ConfiguredModel, LanguageModel, LanguageModelProviderId, LanguageModelRegistry,
+    AuthenticateError, ConfiguredModel, LanguageModel, LanguageModelProviderId,
+    LanguageModelRegistry,
 };
 use ordered_float::OrderedFloat;
 use picker::{Picker, PickerDelegate};
@@ -76,6 +77,7 @@ pub struct LanguageModelPickerDelegate {
     all_models: Arc<GroupedModels>,
     filtered_entries: Vec<LanguageModelPickerEntry>,
     selected_index: usize,
+    _authenticate_all_providers_task: Task<()>,
     _subscriptions: Vec<Subscription>,
 }
 
@@ -96,6 +98,7 @@ impl LanguageModelPickerDelegate {
             selected_index: Self::get_active_model_index(&entries, get_active_model(cx)),
             filtered_entries: entries,
             get_active_model: Arc::new(get_active_model),
+            _authenticate_all_providers_task: Self::authenticate_all_providers(cx),
             _subscriptions: vec![cx.subscribe_in(
                 &LanguageModelRegistry::global(cx),
                 window,
@@ -139,6 +142,56 @@ impl LanguageModelPickerDelegate {
             .unwrap_or(0)
     }
 
+    /// Authenticates all providers in the [`LanguageModelRegistry`].
+    ///
+    /// We do this so that we can populate the language selector with all of the
+    /// models from the configured providers.
+    fn authenticate_all_providers(cx: &mut App) -> Task<()> {
+        let authenticate_all_providers = LanguageModelRegistry::global(cx)
+            .read(cx)
+            .providers()
+            .iter()
+            .map(|provider| (provider.id(), provider.name(), provider.authenticate(cx)))
+            .collect::<Vec<_>>();
+
+        cx.spawn(async move |_cx| {
+            for (provider_id, provider_name, authenticate_task) in authenticate_all_providers {
+                if let Err(err) = authenticate_task.await {
+                    if matches!(err, AuthenticateError::CredentialsNotFound) {
+                        // Since we're authenticating these providers in the
+                        // background for the purposes of populating the
+                        // language selector, we don't care about providers
+                        // where the credentials are not found.
+                    } else {
+                        // Some providers have noisy failure states that we
+                        // don't want to spam the logs with every time the
+                        // language model selector is initialized.
+                        //
+                        // Ideally these should have more clear failure modes
+                        // that we know are safe to ignore here, like what we do
+                        // with `CredentialsNotFound` above.
+                        match provider_id.0.as_ref() {
+                            "lmstudio" | "ollama" => {
+                                // LM Studio and Ollama both make fetch requests to the local APIs to determine if they are "authenticated".
+                                //
+                                // These fail noisily, so we don't log them.
+                            }
+                            "copilot_chat" => {
+                                // Copilot Chat returns an error if Copilot is not enabled, so we don't log those errors.
+                            }
+                            _ => {
+                                log::error!(
+                                    "Failed to authenticate provider: {}: {err}",
+                                    provider_name.0
+                                );
+                            }
+                        }
+                    }
+                }
+            }
+        })
+    }
+
     pub fn active_model(&self, cx: &App) -> Option<ConfiguredModel> {
         (self.get_active_model)(cx)
     }