dave: introduce model config

so you can switch between openai and ollama models

Signed-off-by: William Casarin <jb55@jb55.com>

crates/notedeck_dave/src/lib.rs

@@ -304,6 +304,46 @@ pub struct Dave {
     tools: Arc<HashMap<String, Tool>>,
     client: async_openai::Client<OpenAIConfig>,
     incoming_tokens: Option<Receiver<DaveResponse>>,
+    model_config: ModelConfig,
+}
+
+pub struct ModelConfig {
+    endpoint: Option<String>,
+    model: String,
+    api_key: Option<String>,
+}
+
+impl Default for ModelConfig {
+    fn default() -> Self {
+        ModelConfig {
+            endpoint: None,
+            model: "gpt-4o".to_string(),
+            api_key: std::env::var("OPENAI_API_KEY").ok(),
+        }
+    }
+}
+
+impl ModelConfig {
+    pub fn ollama() -> Self {
+        ModelConfig {
+            endpoint: std::env::var("OLLAMA_HOST").ok(),
+            model: "hhao/qwen2.5-coder-tools:latest".to_string(),
+            api_key: None,
+        }
+    }
+
+    pub fn to_api(&self) -> OpenAIConfig {
+        let mut cfg = OpenAIConfig::new();
+        if let Some(endpoint) = &self.endpoint {
+            cfg = cfg.with_api_base(endpoint.to_owned());
+        }
+
+        if let Some(api_key) = &self.api_key {
+            cfg = cfg.with_api_key(api_key.to_owned());
+        }
+
+        cfg
+    }
 }
 
 impl Dave {
@@ -312,12 +352,9 @@ impl Dave {
     }
 
     pub fn new(render_state: Option<&RenderState>) -> Self {
-        let mut config = OpenAIConfig::new(); //.with_api_base("http://ollama.jb55.com/v1");
-        if let Ok(api_key) = std::env::var("OPENAI_API_KEY") {
-            config = config.with_api_key(api_key);
-        }
-
-        let client = Client::with_config(config);
+        //let mut config = OpenAIConfig::new(); //.with_api_base("http://ollama.jb55.com/v1");
+        let model_config = ModelConfig::default();
+        let client = Client::with_config(model_config.to_api());
 
         let input = "".to_string();
         let pubkey = "32e1827635450ebb3c5a7d12c1f8e7b2b514439ac10a67eef3d9fd9c5c68e245".to_string();
@@ -336,6 +373,7 @@ impl Dave {
             incoming_tokens: None,
             tools: Arc::new(tools),
             input,
+            model_config,
             chat: vec![system_prompt],
         }
     }
@@ -513,6 +551,7 @@ impl Dave {
         let ctx = ctx.clone();
         let client = self.client.clone();
         let tools = self.tools.clone();
+        let model_name = self.model_config.model.clone();
 
         let (tx, rx) = mpsc::channel();
         self.incoming_tokens = Some(rx);
@@ -521,8 +560,7 @@ impl Dave {
             let mut token_stream = match client
                 .chat()
                 .create_stream(CreateChatCompletionRequest {
-                    model: "gpt-4o".to_string(),
-                    //model: "gpt-4o".to_string(),
+                    model: model_name,
                     stream: Some(true),
                     messages,
                     tools: Some(dave_tools().iter().map(|t| t.to_api()).collect()),