add the update chat rest and handler

api/src/routes/rest/routes/chats/mod.rs

@@ -9,6 +9,7 @@ mod get_chat_raw_llm_messages;
 mod list_chats;
 mod post_chat;
 mod sharing;
+mod update_chat;
 mod update_chats;
 
 pub use delete_chats::delete_chats_route;
@@ -16,6 +17,7 @@ pub use get_chat::get_chat_route;
 pub use get_chat_raw_llm_messages::get_chat_raw_llm_messages;
 pub use list_chats::list_chats_route;
 pub use post_chat::post_chat_route;
+pub use update_chat::update_chat_route;
 pub use update_chats::update_chats_route;
 
 pub fn router() -> Router {
@@ -25,6 +27,7 @@ pub fn router() -> Router {
         .route("/", put(update_chats_route))
         .route("/", delete(delete_chats_route))
         .route("/:id", get(get_chat_route))
+        .route("/:id", put(update_chat_route))
         .route("/:id/raw_llm_messages", get(get_chat_raw_llm_messages))
         .nest("/:id/sharing", sharing::router())
 }

api/src/routes/rest/routes/chats/update_chat.rs

@@ -0,0 +1,89 @@
+use anyhow::Result;
+use axum::extract::Path;
+use axum::http::StatusCode;
+use axum::Extension;
+use axum::Json;
+use handlers::chats::update_chats_handler::{ChatUpdate, ChatUpdateResult};
+use handlers::chats::update_chats_handler;
+use middleware::AuthenticatedUser;
+use uuid::Uuid;
+
+use crate::routes::rest::ApiResponse;
+
+/// Update a single chat by ID
+///
+/// PUT /api/v1/chats/:id
+pub async fn update_chat_route(
+    Path(chat_id): Path<Uuid>,
+    Extension(user): Extension<AuthenticatedUser>,
+    Json(update): Json<ChatUpdateRequest>,
+) -> Result<ApiResponse<ChatUpdateResult>, (StatusCode, &'static str)> {
+    let chat_update = ChatUpdate {
+        id: chat_id,
+        title: update.title,
+    };
+    
+    match update_chats_handler(vec![chat_update], &user.id).await {
+        Ok(results) => {
+            if results.is_empty() {
+                Err((StatusCode::INTERNAL_SERVER_ERROR, "Failed to update chat"))
+            } else if !results[0].success {
+                match &results[0].error {
+                    Some(error) if error.contains("not found") => {
+                        Err((StatusCode::NOT_FOUND, "Chat not found"))
+                    }
+                    Some(error) if error.contains("permission") => {
+                        Err((StatusCode::FORBIDDEN, "You don't have permission to update this chat"))
+                    }
+                    _ => Err((StatusCode::INTERNAL_SERVER_ERROR, "Failed to update chat")),
+                }
+            } else {
+                let result = ChatUpdateResult {
+                    id: results[0].id,
+                    success: results[0].success,
+                    error: results[0].error.clone(),
+                };
+                Ok(ApiResponse::JsonData(result))
+            }
+        }
+        Err(e) => {
+            tracing::error!("Error updating chat {}: {}", chat_id, e);
+            Err((StatusCode::INTERNAL_SERVER_ERROR, "Failed to update chat"))
+        }
+    }
+}
+
+#[derive(Debug, serde::Deserialize)]
+pub struct ChatUpdateRequest {
+    pub title: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use axum::{
+        body::Body,
+        http::{Request, StatusCode},
+        routing::put,
+        Router,
+    };
+    use std::str::FromStr;
+    use tower::ServiceExt;
+
+    #[tokio::test]
+    async fn test_update_chat_route_success() {
+        // This test is a simplified unit test example
+        // More comprehensive integration tests are in the tests directory
+        let chat_id = Uuid::from_str("00000000-0000-0000-0000-000000000001").unwrap();
+        let user_id = Uuid::from_str("00000000-0000-0000-0000-000000000002").unwrap();
+        
+        // Since we can't mock the handler function easily in this context,
+        // this test would normally use a test database in integration tests
+        // Here we're just checking the basic structure
+        let update_request = ChatUpdateRequest {
+            title: "Updated Title".to_string(),
+        };
+        
+        // In a real test implementation, we would set up a proper testing environment
+    }
+}

api/tests/integration/chats/mod.rs

@@ -1,2 +1,3 @@
 pub mod sharing;
 pub mod get_chat_test;
+pub mod update_chat_test;

api/tests/integration/chats/update_chat_test.rs

@@ -0,0 +1,139 @@
+use anyhow::Result;
+use chrono::Utc;
+use database::models::Chat;
+use diesel::prelude::*;
+use std::str::FromStr;
+use uuid::Uuid;
+
+use crate::common::{
+    db::run_test_with_db,
+    fixtures::{builder::TestFixtureBuilder, chats::CreateChatParams},
+    http::test_app::{TestApp, TestAppBuilder},
+    http::client::ApiClient,
+};
+
+#[tokio::test]
+async fn test_update_chat() -> Result<()> {
+    run_test_with_db(|db| async move {
+        // Create test user
+        let user_id = Uuid::new_v4();
+        let mut fixture_builder = TestFixtureBuilder::new(db.clone());
+        let user = fixture_builder.create_user(user_id).await?;
+        
+        // Create test chat
+        let chat_id = Uuid::new_v4();
+        let chat = fixture_builder
+            .create_chat(CreateChatParams {
+                id: Some(chat_id),
+                title: Some("Original Title".to_string()),
+                created_by: Some(user_id),
+                ..Default::default()
+            })
+            .await?;
+        
+        // Setup test app
+        let app = TestAppBuilder::new().with_db(db.clone()).build().await?;
+        let client = ApiClient::new(app.client, user.clone());
+        
+        // Test updating the chat
+        let response = client
+            .put(&format!("/api/v1/chats/{}", chat_id))
+            .json(&serde_json::json!({
+                "title": "Updated Title"
+            }))
+            .send()
+            .await?;
+        
+        // Verify response
+        assert_eq!(response.status(), 200);
+        let json = response.json::<serde_json::Value>().await?;
+        assert_eq!(json["id"], chat_id.to_string());
+        assert_eq!(json["success"], true);
+        assert_eq!(json["error"], serde_json::Value::Null);
+        
+        // Verify database update
+        let updated_chat = db.with_conn(|conn| async move {
+            use database::schema::chats;
+            
+            chats::table
+                .find(chat_id)
+                .first::<Chat>(conn)
+                .await
+                .map_err(anyhow::Error::from)
+        }).await?;
+        
+        assert_eq!(updated_chat.title, "Updated Title");
+        
+        Ok(())
+    }).await
+}
+
+#[tokio::test]
+async fn test_update_chat_not_found() -> Result<()> {
+    run_test_with_db(|db| async move {
+        // Create test user
+        let user_id = Uuid::new_v4();
+        let mut fixture_builder = TestFixtureBuilder::new(db.clone());
+        let user = fixture_builder.create_user(user_id).await?;
+        
+        // Setup test app
+        let app = TestAppBuilder::new().with_db(db.clone()).build().await?;
+        let client = ApiClient::new(app.client, user.clone());
+        
+        // Test updating a non-existent chat
+        let non_existent_id = Uuid::new_v4();
+        let response = client
+            .put(&format!("/api/v1/chats/{}", non_existent_id))
+            .json(&serde_json::json!({
+                "title": "Updated Title"
+            }))
+            .send()
+            .await?;
+        
+        // Verify response
+        assert_eq!(response.status(), 404);
+        
+        Ok(())
+    }).await
+}
+
+#[tokio::test]
+async fn test_update_chat_unauthorized() -> Result<()> {
+    run_test_with_db(|db| async move {
+        // Create two test users
+        let user1_id = Uuid::new_v4();
+        let user2_id = Uuid::new_v4();
+        let mut fixture_builder = TestFixtureBuilder::new(db.clone());
+        let user1 = fixture_builder.create_user(user1_id).await?;
+        let user2 = fixture_builder.create_user(user2_id).await?;
+        
+        // Create test chat owned by user1
+        let chat_id = Uuid::new_v4();
+        let chat = fixture_builder
+            .create_chat(CreateChatParams {
+                id: Some(chat_id),
+                title: Some("Original Title".to_string()),
+                created_by: Some(user1_id),
+                ..Default::default()
+            })
+            .await?;
+        
+        // Setup test app with user2 (who doesn't own the chat)
+        let app = TestAppBuilder::new().with_db(db.clone()).build().await?;
+        let client = ApiClient::new(app.client, user2.clone());
+        
+        // Test user2 trying to update user1's chat
+        let response = client
+            .put(&format!("/api/v1/chats/{}", chat_id))
+            .json(&serde_json::json!({
+                "title": "Updated Title"
+            }))
+            .send()
+            .await?;
+        
+        // Verify response (should be forbidden)
+        assert_eq!(response.status(), 403);
+        
+        Ok(())
+    }).await
+}