use crate::events::{AgentEvent, StreamState, ToolEvent};
use crate::mcp::tool_bridge::encode_structured;
use llm::{ToolCallError, ToolCallRequest, ToolCallResult};
use serde::Serialize;
pub fn agent_event(message_id: &str) -> AgentEventBuilder {
AgentEventBuilder::new(message_id)
}
pub struct AgentEventBuilder {
message_id: String,
chunks: Vec<AgentEvent>,
full_text: String,
}
impl AgentEventBuilder {
pub fn new(message_id: &str) -> Self {
Self { message_id: message_id.to_string(), chunks: Vec::new(), full_text: String::new() }
}
pub fn text(mut self, chunks: &[&str]) -> Self {
for chunk in chunks {
self.chunks.push(AgentEvent::text(&self.message_id, chunk, StreamState::Partial));
self.full_text.push_str(chunk);
}
self
}
pub fn tool_call<T: Serialize, U: Serialize>(
mut self,
tool_call_id: &str,
name: &str,
request: &T,
result: &U,
) -> Self {
let request_json = serde_json::to_string(request).expect("Failed to serialize request");
let result_value = serde_json::to_value(result).expect("Failed to serialize result");
self.push_tool_call(tool_call_id, name, &request_json);
self.chunks.push(AgentEvent::Tool(ToolEvent::Result {
result: ToolCallResult {
id: tool_call_id.to_string(),
name: name.to_string(),
arguments: request_json,
result: encode_structured(&result_value),
},
result_meta: None,
}));
self
}
pub fn tool_call_with_error<T: Serialize>(
mut self,
tool_call_id: &str,
name: &str,
request: &T,
error_message: &str,
) -> Self {
let request_json = serde_json::to_string(request).expect("Failed to serialize request");
let error_result = format!("Tool execution error: {error_message}");
self.push_tool_call(tool_call_id, name, &request_json);
self.chunks.push(AgentEvent::Tool(ToolEvent::Error {
error: ToolCallError {
id: tool_call_id.to_string(),
name: name.to_string(),
arguments: Some(request_json),
error: error_result,
},
}));
self
}
pub fn build(mut self) -> Vec<AgentEvent> {
self.chunks.push(AgentEvent::text(&self.message_id, &self.full_text, StreamState::Complete));
self.chunks
}
fn push_tool_call(&mut self, tool_call_id: &str, name: &str, arguments: &str) {
self.chunks.extend([
AgentEvent::Tool(ToolEvent::InputStarted { id: tool_call_id.to_string(), name: name.to_string() }),
AgentEvent::Tool(ToolEvent::InputDelta { id: tool_call_id.to_string(), chunk: arguments.to_string() }),
AgentEvent::Tool(ToolEvent::Call {
request: ToolCallRequest {
id: tool_call_id.to_string(),
name: name.to_string(),
arguments: arguments.to_string(),
},
}),
]);
}
}