//! Legacy `report_completion` — retained for backwards compatibility and testing.
use std::sync::Arc;

use super::super::super::super::{AgentEvent, AgentStatus, CompletionReport};
use super::super::super::{AgentPool, composite_key};

impl AgentPool {
    /// Internal: report that an agent has finished work on a story.
    ///
    /// **Note:** This is no longer exposed as an MCP tool. The server now
    /// automatically runs completion gates when an agent process exits
    /// (see `run_server_owned_completion`). This method is retained for
    /// backwards compatibility and testing.
    ///
    /// - Rejects with an error if the worktree has uncommitted changes.
    /// - Runs acceptance gates (cargo clippy + cargo nextest run / cargo test).
    /// - Stores the `CompletionReport` on the agent record.
    /// - Transitions status to `Completed` (gates passed) or `Failed` (gates failed).
    /// - Emits a `Done` event so `wait_for_agent` unblocks.
    #[allow(dead_code)]
    pub async fn report_completion(
        &self,
        story_id: &str,
        agent_name: &str,
        summary: &str,
    ) -> Result<CompletionReport, String> {
        let key = composite_key(story_id, agent_name);

        // Verify agent exists, is Running, and grab its worktree path.
        let worktree_path = {
            let agents = self.agents.lock().map_err(|e| e.to_string())?;
            let agent = agents
                .get(&key)
                .ok_or_else(|| format!("No agent '{agent_name}' for story '{story_id}'"))?;

            if agent.status != AgentStatus::Running {
                return Err(format!(
                    "Agent '{agent_name}' for story '{story_id}' is not running (status: {}). \
                     report_completion can only be called by a running agent.",
                    agent.status
                ));
            }

            agent
                .worktree_info
                .as_ref()
                .map(|wt| wt.path.clone())
                .ok_or_else(|| {
                    format!(
                        "Agent '{agent_name}' for story '{story_id}' has no worktree. \
                         Cannot run acceptance gates."
                    )
                })?
        };

        let path = worktree_path.clone();

        // Run gate checks in a blocking thread to avoid stalling the async runtime.
        let (gates_passed, gate_output) = tokio::task::spawn_blocking(move || {
            // Step 1: Reject if worktree is dirty.
            crate::agents::gates::check_uncommitted_changes(&path)?;
            // Step 2: Run clippy + tests and return (passed, output).
            crate::agents::gates::run_acceptance_gates(&path)
        })
        .await
        .map_err(|e| format!("Gate check task panicked: {e}"))??;

        let report = CompletionReport {
            summary: summary.to_string(),
            gates_passed,
            gate_output,
        };

        // Extract data for pipeline advance, then remove the entry so
        // completed agents never appear in list_agents.
        let (
            tx,
            session_id,
            project_root_for_advance,
            wt_path_for_advance,
            merge_failure_reported_for_advance,
            session_id_for_advance,
        ) = {
            let mut agents = self.agents.lock().map_err(|e| e.to_string())?;
            let agent = agents.get_mut(&key).ok_or_else(|| {
                format!("Agent '{agent_name}' for story '{story_id}' disappeared during gate check")
            })?;
            agent.completion = Some(report.clone());
            let tx = agent.tx.clone();
            let sid = agent.session_id.clone();
            let pr = agent.project_root.clone();
            let wt = agent.worktree_info.as_ref().map(|w| w.path.clone());
            let mfr = agent.merge_failure_reported;
            let sid_advance = agent.session_id.clone();
            agents.remove(&key);
            (tx, sid, pr, wt, mfr, sid_advance)
        };

        // Emit Done so wait_for_agent unblocks.
        let _ = tx.send(AgentEvent::Done {
            story_id: story_id.to_string(),
            agent_name: agent_name.to_string(),
            session_id,
        });

        // Notify WebSocket clients that the agent is gone.
        Self::notify_agent_state_changed(&self.watcher_tx);

        // Advance the pipeline state machine in a background task.
        let pool_clone = Self {
            agents: Arc::clone(&self.agents),
            port: self.port,
            child_killers: Arc::clone(&self.child_killers),
            watcher_tx: self.watcher_tx.clone(),
            status_broadcaster: Arc::clone(&self.status_broadcaster),
        };
        let sid = story_id.to_string();
        let aname = agent_name.to_string();
        let report_for_advance = report.clone();
        tokio::spawn(async move {
            pool_clone
                .run_pipeline_advance(
                    &sid,
                    &aname,
                    report_for_advance,
                    project_root_for_advance,
                    wt_path_for_advance,
                    merge_failure_reported_for_advance,
                    session_id_for_advance,
                )
                .await;
        });

        Ok(report)
    }
}