//! Manager harness. Talks to the manager socket (bind-mounted from the host
//! at `/run/hive/mcp.sock` inside the `hm1nd` container). Two surfaces:
//! `serve` (long-lived turn loop) and `mcp` (stdio MCP server claude spawns).

use std::path::{Path, PathBuf};
use std::sync::{Arc, Mutex};
use std::time::Duration;

use hive_ag3nt::web_ui::TurnLock;

use anyhow::Result;
use clap::{Parser, Subcommand};
use hive_ag3nt::events::{Bus, LiveEvent, TurnState};
use hive_ag3nt::login::{self, LoginState};
use hive_ag3nt::turn_stats::{TurnStatRow, TurnStats};
use hive_ag3nt::{DEFAULT_SOCKET, DEFAULT_WEB_PORT, client, mcp, plugins, turn, web_ui};
use hive_sh4re::{HelperEvent, ManagerRequest, ManagerResponse, SYSTEM_SENDER};

#[derive(Parser)]
#[command(name = "hive-m1nd", about = "hyperhive manager harness")]
struct Cli {
    /// Path to the manager MCP socket (bind-mounted from the host).
    #[arg(long, global = true, default_value = DEFAULT_SOCKET)]
    socket: PathBuf,

    #[command(subcommand)]
    cmd: Cmd,
}

#[derive(Subcommand)]
enum Cmd {
    /// Long-lived loop polling the manager inbox.
    Serve {
        #[arg(long, default_value_t = 1000)]
        poll_ms: u64,
    },
    /// Run the manager MCP server on stdio. Spawned by claude via
    /// `--mcp-config`; same shape as `hive-ag3nt mcp` but with the
    /// manager tool surface (`request_spawn`, `kill`, `start`, `restart`,
    /// `request_apply_commit`, `ask`, `answer`, `remind`).
    Mcp,
}

#[tokio::main]
async fn main() -> Result<()> {
    tracing_subscriber::fmt()
        .with_env_filter(
            tracing_subscriber::EnvFilter::try_from_default_env()
                .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info")),
        )
        .init();

    let cli = Cli::parse();
    match cli.cmd {
        Cmd::Serve { poll_ms } => {
            let port = std::env::var("HIVE_PORT")
                .ok()
                .and_then(|s| s.parse::<u16>().ok())
                .unwrap_or(DEFAULT_WEB_PORT);
            let label = std::env::var("HIVE_LABEL").unwrap_or_else(|_| "hm1nd".into());
            let claude_dir = login::default_dir();
            let initial = LoginState::from_dir(&claude_dir);
            tracing::info!(state = ?initial, claude_dir = %claude_dir.display(), "hm1nd boot");
            let login_state = Arc::new(Mutex::new(initial));
            let bus = Bus::new();
            let stats = TurnStats::open_default();
            if let Some(s) = &stats {
                let (ctx, cost) = s.last_usage();
                if ctx.is_some() || cost.is_some() {
                    bus.seed_usage(ctx, cost);
                }
            }
            let files = turn::TurnFiles::prepare(&cli.socket, &label, mcp::Flavor::Manager).await?;
            let turn_lock: TurnLock = Arc::new(tokio::sync::Mutex::new(()));
            plugins::install_configured(&cli.socket, None).await;
            tokio::spawn(web_ui::serve(
                label,
                port,
                login_state.clone(),
                bus.clone(),
                cli.socket.clone(),
                files.clone(),
                turn_lock.clone(),
            ));
            match initial {
                LoginState::Online => {
                    serve(
                        &cli.socket,
                        Duration::from_millis(poll_ms),
                        bus,
                        stats,
                        &files,
                        turn_lock,
                    )
                    .await
                }
                LoginState::NeedsLogin => {
                    turn::wait_for_login(&claude_dir, login_state, &bus, poll_ms).await;
                    serve(
                        &cli.socket,
                        Duration::from_millis(poll_ms),
                        bus,
                        stats,
                        &files,
                        turn_lock,
                    )
                    .await
                }
            }
        }
        Cmd::Mcp => mcp::serve_manager_stdio(cli.socket).await,
    }
}

async fn serve(
    socket: &Path,
    interval: Duration,
    bus: Bus,
    stats: Option<TurnStats>,
    files: &turn::TurnFiles,
    turn_lock: TurnLock,
) -> Result<()> {
    tracing::info!(socket = %socket.display(), "hive-m1nd serve");
    // Same boot-time recovery as hive-ag3nt — see that loop for the
    // rationale. Manager-flavour socket so we requeue only manager
    // inflight rows.
    requeue_inflight(socket).await;
    loop {
        let recv: Result<ManagerResponse> =
            // Explicit long-poll: see hive-ag3nt's serve loop for the
            // rationale — recv now defaults to peek when wait_seconds
            // is None.
            client::request(
                socket,
                &ManagerRequest::Recv {
                    wait_seconds: Some(180),
                },
            )
            .await;
        match recv {
            Ok(ManagerResponse::Message {
                from,
                body,
                id: _,
                redelivered,
            }) => {
                if from == SYSTEM_SENDER {
                    // Helper events (ApprovalResolved / Spawned / Rebuilt /
                    // Killed / Destroyed) — these are FYI for the manager;
                    // we surface them in the live view and forward them as
                    // a normal claude turn so the manager can react (e.g.
                    // greet a newly-spawned agent, retry a failed rebuild).
                    let parsed = serde_json::from_str::<HelperEvent>(&body).ok();
                    if let Some(event) = parsed {
                        tracing::info!(?event, "helper event");
                    } else {
                        tracing::info!(%from, %body, "system message");
                    }
                    bus.emit(LiveEvent::Note {
                        text: format!("[system] {body}"),
                    });
                    // Fall through: drive a turn with the event in the wake
                    // prompt body so claude sees it. Sender stays "system"
                    // so the wake prompt can label it as such.
                }
                tracing::info!(%from, %body, %redelivered, "manager inbox");
                let unread = inbox_unread(socket).await;
                bus.emit(LiveEvent::TurnStart {
                    from: from.clone(),
                    body: body.clone(),
                    unread,
                });
                let prompt = format_wake_prompt(&from, &body, unread, redelivered);
                bus.set_state(TurnState::Thinking);
                let started_at = now_unix();
                let started_instant = std::time::Instant::now();
                let model_at_start = bus.model();
                let outcome = {
                    let _guard = turn_lock.lock().await;
                    turn::drive_turn(&prompt, files, &bus).await
                };
                turn::emit_turn_end(&bus, &outcome);
                bus.set_state(TurnState::Idle);
                // Ack only on a clean turn-end; Failed leaves the
                // popped ids in-flight for the next boot's requeue.
                // Mirrors hive-ag3nt; see that loop for full rationale.
                if matches!(outcome, turn::TurnOutcome::Ok) {
                    ack_turn(socket).await;
                }
                if let Some(s) = &stats {
                    let ended_at = now_unix();
                    let duration_ms =
                        i64::try_from(started_instant.elapsed().as_millis()).unwrap_or(i64::MAX);
                    let (open_threads, open_reminders) =
                        fetch_manager_post_turn_counts(socket).await;
                    let row = build_row(
                        started_at,
                        ended_at,
                        duration_ms,
                        model_at_start,
                        from.clone(),
                        &outcome,
                        &bus,
                        open_threads,
                        open_reminders,
                    );
                    s.record(&row);
                }
                // Check for messages that arrived during the turn so we
                // surface "draining" in the logs. The loop will already
                // re-iterate from here — no explicit continue needed.
                let pending = inbox_unread(socket).await;
                if pending > 0 {
                    tracing::info!(%pending, "pending messages after turn; fetching next");
                }
            }
            Ok(ManagerResponse::Empty) => {
                // Idle: sleep briefly before next long-poll attempt.
                tokio::time::sleep(interval).await;
            }
            Ok(
                ManagerResponse::Ok
                | ManagerResponse::Status { .. }
                | ManagerResponse::QuestionQueued { .. }
                | ManagerResponse::Recent { .. }
                | ManagerResponse::Logs { .. }
                | ManagerResponse::LooseEnds { .. }
                | ManagerResponse::PendingRemindersCount { .. }
                | ManagerResponse::Whoami { .. },
            ) => {
                tracing::warn!("recv produced unexpected response kind");
            }
            Ok(ManagerResponse::Err { message }) => {
                tracing::warn!(%message, "recv error");
            }
            Err(e) => {
                tracing::warn!(error = ?e, "recv failed; retrying");
            }
        }
    }
}

/// Per-turn user prompt. The role/tools/etc. is in the system prompt
/// (`prompts/manager.md` → `claude --system-prompt-file`); this is just
/// the wake signal. `unread` is the inbox depth after this message was
/// popped. `redelivered` adds a "may already be handled" banner above
/// the wake body when the broker resurfaced this row (see hive-ag3nt's
/// `format_wake_prompt` for the full story).
fn format_wake_prompt(from: &str, body: &str, unread: u64, redelivered: bool) -> String {
    let banner = if redelivered {
        hive_ag3nt::mcp::REDELIVERY_HINT
    } else {
        ""
    };
    let pending = if unread == 0 {
        String::new()
    } else {
        format!(
            "\n\n({unread} more message(s) pending in your inbox — drain via `mcp__hyperhive__recv` if relevant.)"
        )
    };
    format!("{banner}Incoming message from `{from}`:\n---\n{body}\n---{pending}")
}

/// Best-effort: tell the broker every message popped during the turn
/// is now handled. Mirror of `hive-ag3nt::ack_turn` on the manager
/// surface.
async fn ack_turn(socket: &Path) {
    match client::request::<_, ManagerResponse>(socket, &ManagerRequest::AckTurn).await {
        Ok(ManagerResponse::Ok) => {}
        Ok(ManagerResponse::Err { message }) => {
            tracing::warn!(%message, "ack_turn rejected by broker");
        }
        Ok(other) => {
            tracing::warn!(?other, "ack_turn unexpected response");
        }
        Err(e) => tracing::warn!(error = ?e, "ack_turn transport error"),
    }
}

/// Boot-time recovery: ask the broker to resurface any inflight (popped
/// but not acked) messages so the next `Recv` re-delivers them with
/// the redelivery banner. Mirror of `hive-ag3nt::requeue_inflight`.
async fn requeue_inflight(socket: &Path) {
    match client::request::<_, ManagerResponse>(socket, &ManagerRequest::RequeueInflight).await {
        Ok(ManagerResponse::Ok) => {}
        Ok(ManagerResponse::Err { message }) => {
            tracing::warn!(%message, "requeue_inflight rejected by broker");
        }
        Ok(other) => {
            tracing::warn!(?other, "requeue_inflight unexpected response");
        }
        Err(e) => tracing::warn!(error = ?e, "requeue_inflight transport error"),
    }
}

async fn inbox_unread(socket: &Path) -> u64 {
    match client::request::<_, ManagerResponse>(socket, &ManagerRequest::Status).await {
        Ok(ManagerResponse::Status { unread }) => unread,
        _ => 0,
    }
}

fn now_unix() -> i64 {
    std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .ok()
        .and_then(|d| i64::try_from(d.as_secs()).ok())
        .unwrap_or(0)
}

/// Manager-flavour equivalent of the agent helper. Mirror shape, just
/// uses ManagerRequest/ManagerResponse instead of the agent variants.
async fn fetch_manager_post_turn_counts(socket: &Path) -> (Option<u64>, Option<u64>) {
    let threads = match client::request::<_, ManagerResponse>(
        socket,
        &ManagerRequest::GetLooseEnds,
    )
    .await
    {
        Ok(ManagerResponse::LooseEnds { loose_ends }) => u64::try_from(loose_ends.len()).ok(),
        _ => None,
    };
    let reminders = match client::request::<_, ManagerResponse>(
        socket,
        &ManagerRequest::CountPendingReminders,
    )
    .await
    {
        Ok(ManagerResponse::PendingRemindersCount { count }) => Some(count),
        _ => None,
    };
    (threads, reminders)
}

/// Manager flavour of the agent's `build_row` helper. Duplicated rather
/// than shared to keep each bin self-contained at this size.
#[allow(clippy::too_many_arguments)]
fn build_row(
    started_at: i64,
    ended_at: i64,
    duration_ms: i64,
    model: String,
    wake_from: String,
    outcome: &turn::TurnOutcome,
    bus: &Bus,
    open_threads_count: Option<u64>,
    open_reminders_count: Option<u64>,
) -> TurnStatRow {
    let cost = bus.last_cost_usage().unwrap_or_default();
    let ctx = bus.last_ctx_usage().unwrap_or(cost);
    let tool_calls = bus.take_tool_calls();
    let tool_call_count: u64 = tool_calls.values().copied().sum();
    let tool_call_breakdown_json = if tool_calls.is_empty() {
        None
    } else {
        serde_json::to_string(&tool_calls).ok()
    };
    let (result_kind, note) = match outcome {
        turn::TurnOutcome::Ok => ("ok", None),
        turn::TurnOutcome::PromptTooLong => ("prompt_too_long", None),
        turn::TurnOutcome::Failed(e) => ("failed", Some(format!("{e:#}"))),
    };
    TurnStatRow {
        started_at,
        ended_at,
        duration_ms,
        model,
        wake_from,
        input_tokens: cost.input_tokens,
        output_tokens: cost.output_tokens,
        cache_read_input_tokens: cost.cache_read_input_tokens,
        cache_creation_input_tokens: cost.cache_creation_input_tokens,
        last_input_tokens: ctx.input_tokens,
        last_output_tokens: ctx.output_tokens,
        last_cache_read_input_tokens: ctx.cache_read_input_tokens,
        last_cache_creation_input_tokens: ctx.cache_creation_input_tokens,
        tool_call_count,
        tool_call_breakdown_json,
        open_threads_count,
        open_reminders_count,
        result_kind,
        note,
    }
}