feat(m2): add chat Tauri command — spawns Ollama stream, emits chat-token/done/error

src-tauri/src/commands.rs

@@ -1,6 +1,6 @@
 use crate::config::{MigrationConfig, NotificationLevel, RobinConfig, SourceOs};
 use std::sync::Mutex;
-use tauri::State;
+use tauri::{Emitter, State};
 
 pub struct AppState {
     pub config: Mutex<RobinConfig>,
@@ -79,3 +79,50 @@ pub fn panel_opened() {
 pub fn panel_closed() {
     crate::notify::set_panel_open(false);
 }
+
+#[tauri::command]
+pub async fn chat(
+    message: String,
+    state: State<'_, AppState>,
+    app_handle: tauri::AppHandle,
+) -> Result<(), String> {
+    let (base_url, model, source_os, distro) = {
+        let cfg = state.config.lock().map_err(|e| e.to_string())?;
+        let base_url = cfg.ollama.base_url.clone();
+        let model = cfg.ollama.model.clone();
+        let (source_os, distro) = match cfg.migration.as_ref() {
+            Some(m) => {
+                let os = match m.source_os {
+                    crate::config::SourceOs::Macos => "macOS",
+                    crate::config::SourceOs::Windows => "Windows",
+                    crate::config::SourceOs::Linux => "Linux",
+                    crate::config::SourceOs::Unknown => "an unknown OS",
+                };
+                (os.to_string(), m.distro.clone())
+            }
+            None => ("an unknown OS".to_string(), "Linux".to_string()),
+        };
+        (base_url, model, source_os, distro)
+    };
+
+    let system_prompt = crate::llm::build_system_prompt(&source_os, &distro);
+    let messages = vec![
+        crate::llm::ChatMessage {
+            role: "system".into(),
+            content: system_prompt,
+        },
+        crate::llm::ChatMessage {
+            role: "user".into(),
+            content: message,
+        },
+    ];
+
+    tauri::async_runtime::spawn(async move {
+        if let Err(e) = crate::llm::chat_stream(&base_url, &model, messages, &app_handle).await {
+            log::error!("chat stream error: {e}");
+            let _ = app_handle.emit("robin:chat-error", e.to_string());
+        }
+    });
+
+    Ok(())
+}