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// SPDX-FileCopyrightText: 2026 Andrei G <bug-ops>
// SPDX-License-Identifier: MIT OR Apache-2.0
use tokio::sync::mpsc;
use crate::event::{AgentEvent, AppEvent};
use super::{App, ChatMessage, ConfirmState, ElicitationState, MessageRole, debug};
impl App {
/// Dispatch a top-level [`AppEvent`] to the appropriate handler.
///
/// Called once per event in the main [`crate::run_tui`] loop.
pub fn handle_event(&mut self, event: AppEvent) {
match event {
AppEvent::Key(key) => self.handle_key(key),
AppEvent::Tick => {
self.throbber_state.calc_next();
}
AppEvent::Resize(_, _) => {
self.sessions.current_mut().render_cache.clear();
}
AppEvent::MouseScroll(delta) => {
if self.confirm_state.is_none() {
if delta > 0 {
self.sessions.current_mut().scroll_offset =
self.sessions.current().scroll_offset.saturating_add(1);
} else {
self.sessions.current_mut().scroll_offset =
self.sessions.current().scroll_offset.saturating_sub(1);
}
}
}
AppEvent::Agent(agent_event) => self.handle_agent_event(agent_event),
AppEvent::Paste(text) => self.handle_paste(&text),
}
}
/// Await the next [`AgentEvent`] from the agent channel.
///
/// Returns `None` when all senders have been dropped (agent exited).
/// Called from the `select!` block in [`crate::run_tui`].
pub fn poll_agent_event(&mut self) -> impl Future<Output = Option<AgentEvent>> + use<'_> {
self.agent_event_rx.recv()
}
/// Non-blocking poll for a pending [`AgentEvent`].
///
/// Used to drain the channel after a first event has been received,
/// coalescing multiple events into a single render frame.
///
/// # Errors
///
/// Returns `TryRecvError::Empty` if no events are pending, or
/// `TryRecvError::Disconnected` if the sender has been dropped.
pub fn try_recv_agent_event(&mut self) -> Result<AgentEvent, mpsc::error::TryRecvError> {
self.agent_event_rx.try_recv()
}
/// Handle an [`AgentEvent`] and update widget state accordingly.
///
/// This is the main state-transition function for agent-driven updates:
/// appending streaming chunks, recording tool events, displaying confirm
/// dialogs, and wiring late-bound channels (cancel signal, metrics).
#[allow(clippy::too_many_lines)] // large match over all agent event variants
pub fn handle_agent_event(&mut self, event: AgentEvent) {
match event {
AgentEvent::Chunk(text) => {
self.sessions.current_mut().status_label = None;
if let Some(last) = self.sessions.current_mut().messages.last_mut()
&& last.role == MessageRole::Assistant
&& last.streaming
{
last.content.push_str(&text);
} else {
self.sessions
.current_mut()
.messages
.push(ChatMessage::new(MessageRole::Assistant, text).streaming());
self.trim_messages();
}
// No explicit cache invalidation needed: the cache key includes
// content_hash, so new chunk content causes a natural cache miss.
self.auto_scroll();
}
AgentEvent::FullMessage(text) => {
self.sessions.current_mut().status_label = None;
if !text.starts_with("[tool output") {
self.sessions
.current_mut()
.messages
.push(ChatMessage::new(MessageRole::Assistant, text));
self.trim_messages();
}
self.auto_scroll();
}
AgentEvent::Flush => {
if let Some(last) = self.sessions.current_mut().messages.last_mut()
&& last.streaming
{
last.streaming = false;
let last_idx = self.sessions.current().messages.len().saturating_sub(1);
self.sessions
.current_mut()
.render_cache
.invalidate(last_idx);
}
}
AgentEvent::Typing => {
self.pending_count = self.pending_count.saturating_sub(1);
self.sessions.current_mut().status_label = Some("thinking...".to_owned());
}
AgentEvent::Status(text) => {
self.sessions.current_mut().status_label =
if text.is_empty() { None } else { Some(text) };
self.auto_scroll();
}
AgentEvent::ToolStart { tool_name, command } => {
self.sessions.current_mut().status_label = None;
self.sessions.current_mut().messages.push(
ChatMessage::new(MessageRole::Tool, format!("$ {command}\n"))
.streaming()
.with_tool(tool_name),
);
self.trim_messages();
self.auto_scroll();
}
AgentEvent::ToolOutputChunk { chunk, .. } => {
if let Some(pos) = self
.sessions
.current_mut()
.messages
.iter()
.rposition(|m| m.role == MessageRole::Tool && m.streaming)
{
self.sessions.current_mut().messages[pos]
.content
.push_str(&chunk);
self.sessions.current_mut().render_cache.invalidate(pos);
}
self.auto_scroll();
}
AgentEvent::ToolOutput {
tool_name,
output,
diff,
filter_stats,
kept_lines,
..
} => {
self.handle_tool_output_event(tool_name, output, diff, filter_stats, kept_lines);
}
AgentEvent::ConfirmRequest {
prompt,
response_tx,
} => {
self.confirm_state = Some(ConfirmState {
prompt,
response_tx: Some(response_tx),
});
}
AgentEvent::ElicitationRequest {
request,
response_tx,
} => {
let dialog = crate::widgets::elicitation::ElicitationDialogState::new(request);
self.elicitation_state = Some(ElicitationState {
dialog,
response_tx: Some(response_tx),
});
}
AgentEvent::QueueCount(count) => {
self.queued_count = count;
self.pending_count = count;
}
AgentEvent::DiffReady(diff) => self.handle_diff_ready(diff),
AgentEvent::CommandResult { output, .. } => {
self.command_palette = None;
self.sessions
.current_mut()
.messages
.push(ChatMessage::new(MessageRole::System, output));
self.trim_messages();
self.auto_scroll();
}
AgentEvent::SetCancelSignal(signal) => {
self.set_cancel_signal(signal);
}
AgentEvent::SetMetricsRx(rx) => {
self.set_metrics_rx(rx);
}
}
}
fn handle_diff_ready(&mut self, diff: zeph_core::DiffData) {
if let Some(msg) = self
.sessions
.current_mut()
.messages
.iter_mut()
.rev()
.find(|m| m.role == MessageRole::Tool)
{
msg.diff_data = Some(diff);
}
}
fn handle_tool_output_event(
&mut self,
tool_name: zeph_common::ToolName,
output: String,
diff: Option<zeph_core::DiffData>,
filter_stats: Option<String>,
kept_lines: Option<Vec<usize>>,
) {
debug!(
%tool_name,
has_diff = diff.is_some(),
has_filter_stats = filter_stats.is_some(),
output_len = output.len(),
"TUI ToolOutput event received"
);
if let Some(pos) = self
.sessions
.current_mut()
.messages
.iter()
.rposition(|m| m.role == MessageRole::Tool && m.streaming)
{
// Finalize existing streaming tool message (shell or native path with ToolStart).
// Replace content after the header line ("$ cmd\n") with the canonical body_display
// from ToolOutputEvent. Streaming chunks (Path B) may already occupy that space;
// appending would duplicate the output. Truncating to the header and re-writing
// body_display produces exactly one copy regardless of whether chunks arrived.
debug!("finalizing existing streaming Tool message");
let header_end = self.sessions.current_mut().messages[pos]
.content
.find('\n')
.map_or(0, |i| i + 1);
self.sessions.current_mut().messages[pos]
.content
.truncate(header_end);
self.sessions.current_mut().messages[pos]
.content
.push_str(&output);
self.sessions.current_mut().messages[pos].streaming = false;
self.sessions.current_mut().messages[pos].diff_data = diff;
self.sessions.current_mut().messages[pos].filter_stats = filter_stats;
self.sessions.current_mut().messages[pos].kept_lines = kept_lines;
self.sessions.current_mut().render_cache.invalidate(pos);
} else if diff.is_some() || filter_stats.is_some() || kept_lines.is_some() {
// No prior ToolStart: create the message now (legacy fallback).
debug!("creating new Tool message with diff (no prior ToolStart)");
let mut msg = ChatMessage::new(MessageRole::Tool, output).with_tool(tool_name);
msg.diff_data = diff;
msg.filter_stats = filter_stats;
msg.kept_lines = kept_lines;
self.sessions.current_mut().messages.push(msg);
self.trim_messages();
} else if let Some(msg) = self
.sessions
.current_mut()
.messages
.iter_mut()
.rev()
.find(|m| m.role == MessageRole::Tool)
{
msg.filter_stats = filter_stats;
}
self.auto_scroll();
}
#[must_use]
pub fn confirm_state(&self) -> Option<&ConfirmState> {
self.confirm_state.as_ref()
}
}