// PoC daemon.
//
// Central hub for notification routing, idle management, and
// communication modules (IRC, Telegram) for Claude Code sessions.
// Listens on a Unix domain socket with a Cap'n Proto RPC interface.
// Same binary serves as both daemon and CLI client.
//
// Usage:
//   poc-daemon                    Start the daemon
//   poc-daemon status             Query daemon status
//   poc-daemon user [pane]        Signal user activity
//   poc-daemon response [pane]    Signal Claude response
//   poc-daemon notify <type> <urgency> <message>
//   poc-daemon notifications      Get pending notifications
//   poc-daemon notify-types       List all notification types
//   poc-daemon notify-threshold <type> <level>
//   poc-daemon sleep [timestamp]  Sleep (0 or omit = indefinite)
//   poc-daemon wake               Cancel sleep
//   poc-daemon quiet [seconds]    Suppress prompts
//   poc-daemon irc <command>      IRC module commands
//   poc-daemon stop               Shut down daemon

mod config;
mod context;
mod idle;
mod modules;
pub mod notify;
mod rpc;
mod tmux;

pub mod daemon_capnp {
    include!(concat!(env!("OUT_DIR"), "/schema/daemon_capnp.rs"));
}

use std::cell::RefCell;
use std::path::PathBuf;
use std::rc::Rc;
use std::time::{Duration, SystemTime, UNIX_EPOCH};

use capnp_rpc::{rpc_twoparty_capnp, twoparty, RpcSystem};
use futures::AsyncReadExt;
use tokio::net::UnixListener;
use tracing::{error, info};

pub fn now() -> f64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .unwrap()
        .as_secs_f64()
}

pub fn home() -> PathBuf {
    PathBuf::from(std::env::var("HOME").unwrap_or_else(|_| "/root".into()))
}

fn sock_path() -> PathBuf {
    home().join(".claude/hooks/idle-timer.sock")
}

fn pid_path() -> PathBuf {
    home().join(".claude/hooks/idle-daemon.pid")
}

// ── Client mode ──────────────────────────────────────────────────

async fn client_main(args: Vec<String>) -> Result<(), Box<dyn std::error::Error>> {
    let sock = sock_path();
    if !sock.exists() {
        eprintln!("daemon not running (no socket at {})", sock.display());
        std::process::exit(1);
    }

    tokio::task::LocalSet::new()
        .run_until(async move {
            let stream = tokio::net::UnixStream::connect(&sock).await?;
            let (reader, writer) =
                tokio_util::compat::TokioAsyncReadCompatExt::compat(stream).split();
            let rpc_network = Box::new(twoparty::VatNetwork::new(
                futures::io::BufReader::new(reader),
                futures::io::BufWriter::new(writer),
                rpc_twoparty_capnp::Side::Client,
                Default::default(),
            ));
            let mut rpc_system = RpcSystem::new(rpc_network, None);
            let daemon: daemon_capnp::daemon::Client =
                rpc_system.bootstrap(rpc_twoparty_capnp::Side::Server);

            tokio::task::spawn_local(rpc_system);

            let cmd = args.get(1).map(|s| s.as_str()).unwrap_or("status");

            match cmd {
                "status" => {
                    let reply = daemon.status_request().send().promise.await?;
                    let status = reply.get()?.get_status()?;
                    println!(
                        "uptime={:.0}s pane={} kent={} activity={:?} pending={} fired={} sleep={} quiet={} dreaming={} consolidating={}",
                        status.get_uptime(),
                        status.get_claude_pane()?.to_str().unwrap_or("none"),
                        status.get_kent_present(),
                        status.get_activity()?,
                        status.get_pending_count(),
                        status.get_fired(),
                        status.get_sleep_until(),
                        status.get_quiet_until(),
                        status.get_dreaming(),
                        status.get_consolidating(),
                    );
                }
                "user" => {
                    let pane = args.get(2).map(|s| s.as_str()).unwrap_or("");
                    let mut req = daemon.user_request();
                    req.get().set_pane(pane);
                    req.send().promise.await?;
                }
                "response" => {
                    let pane = args.get(2).map(|s| s.as_str()).unwrap_or("");
                    let mut req = daemon.response_request();
                    req.get().set_pane(pane);
                    req.send().promise.await?;
                }
                "sleep" => {
                    let until: f64 = args.get(2).and_then(|s| s.parse().ok()).unwrap_or(0.0);
                    let mut req = daemon.sleep_request();
                    req.get().set_until(until);
                    req.send().promise.await?;
                }
                "wake" => {
                    daemon.wake_request().send().promise.await?;
                }
                "quiet" => {
                    let secs: u32 = args.get(2).and_then(|s| s.parse().ok()).unwrap_or(300);
                    let mut req = daemon.quiet_request();
                    req.get().set_seconds(secs);
                    req.send().promise.await?;
                }
                "consolidating" => {
                    daemon.consolidating_request().send().promise.await?;
                }
                "consolidated" => {
                    daemon.consolidated_request().send().promise.await?;
                }
                "dream-start" => {
                    daemon.dream_start_request().send().promise.await?;
                }
                "dream-end" => {
                    daemon.dream_end_request().send().promise.await?;
                }
                "stop" => {
                    daemon.stop_request().send().promise.await?;
                    println!("stopping");
                }
                "notify" => {
                    let ntype = args.get(2).ok_or("missing type")?;
                    let urgency_str = args.get(3).ok_or("missing urgency")?;
                    let urgency = notify::parse_urgency(urgency_str)
                        .ok_or_else(|| format!("invalid urgency: {urgency_str}"))?;
                    let message = args[4..].join(" ");
                    if message.is_empty() {
                        return Err("missing message".into());
                    }

                    let mut req = daemon.notify_request();
                    let mut n = req.get().init_notification();
                    n.set_type(ntype);
                    n.set_urgency(urgency);
                    n.set_message(&message);
                    n.set_timestamp(crate::now());
                    let reply = req.send().promise.await?;
                    if reply.get()?.get_interrupt() {
                        println!("interrupt");
                    } else {
                        println!("queued");
                    }
                }
                "notifications" => {
                    let min: u8 = args
                        .get(2)
                        .and_then(|s| notify::parse_urgency(s))
                        .unwrap_or(255);

                    let mut req = daemon.get_notifications_request();
                    req.get().set_min_urgency(min);
                    let reply = req.send().promise.await?;
                    let list = reply.get()?.get_notifications()?;

                    if !list.is_empty() {
                        for n in list.iter() {
                            println!(
                                "[{}:{}] {}",
                                n.get_type()?.to_str()?,
                                notify::urgency_name(n.get_urgency()),
                                n.get_message()?.to_str()?,
                            );
                        }
                    }
                }
                "notify-types" => {
                    let reply = daemon.get_types_request().send().promise.await?;
                    let list = reply.get()?.get_types()?;

                    if list.is_empty() {
                        println!("no notification types registered");
                    } else {
                        for t in list.iter() {
                            let threshold = if t.get_threshold() < 0 {
                                "inherit".to_string()
                            } else {
                                notify::urgency_name(t.get_threshold() as u8).to_string()
                            };
                            println!(
                                "{}: count={} threshold={}",
                                t.get_name()?.to_str()?,
                                t.get_count(),
                                threshold,
                            );
                        }
                    }
                }
                "notify-threshold" => {
                    let ntype = args.get(2).ok_or("missing type")?;
                    let level_str = args.get(3).ok_or("missing level")?;
                    let level = notify::parse_urgency(level_str)
                        .ok_or_else(|| format!("invalid level: {level_str}"))?;

                    let mut req = daemon.set_threshold_request();
                    req.get().set_type(ntype);
                    req.get().set_level(level);
                    req.send().promise.await?;
                    println!("{ntype} threshold={}", notify::urgency_name(level));
                }
                // Module commands: "irc join #foo", "telegram send hello"
                "irc" | "telegram" => {
                    let module = cmd;
                    let module_cmd = args.get(2).ok_or(
                        format!("usage: poc-daemon {module} <command> [args...]"),
                    )?;
                    let module_args: Vec<&str> = args[3..].iter().map(|s| s.as_str()).collect();

                    let mut req = daemon.module_command_request();
                    req.get().set_module(module);
                    req.get().set_command(module_cmd);
                    let mut args_builder = req.get().init_args(module_args.len() as u32);
                    for (i, a) in module_args.iter().enumerate() {
                        args_builder.set(i as u32, a);
                    }
                    let reply = req.send().promise.await?;
                    let result = reply.get()?.get_result()?.to_str()?;
                    if !result.is_empty() {
                        println!("{result}");
                    }
                }
                _ => {
                    eprintln!("unknown command: {cmd}");
                    std::process::exit(1);
                }
            }

            Ok(())
        })
        .await
}

// ── Server mode ──────────────────────────────────────────────────

async fn server_main() -> Result<(), Box<dyn std::error::Error>> {
    let log_path = home().join(".claude/hooks/idle-daemon.log");
    let file_appender = tracing_appender::rolling::daily(
        log_path.parent().unwrap(),
        "idle-daemon.log",
    );
    tracing_subscriber::fmt()
        .with_writer(file_appender)
        .with_ansi(false)
        .with_target(false)
        .with_level(false)
        .with_timer(tracing_subscriber::fmt::time::time())
        .init();

    let sock = sock_path();
    let _ = std::fs::remove_file(&sock);

    let pid = std::process::id();
    std::fs::write(pid_path(), pid.to_string()).ok();

    let daemon_config = Rc::new(RefCell::new(config::Config::load()));

    let state = Rc::new(RefCell::new(idle::State::new()));
    state.borrow_mut().load();

    info!("daemon started (pid={pid})");

    tokio::task::LocalSet::new()
        .run_until(async move {
            // Start modules
            let (notify_tx, mut notify_rx) = tokio::sync::mpsc::unbounded_channel();

            let irc_state = if daemon_config.borrow().irc.enabled {
                let irc_config = daemon_config.borrow().irc.clone();
                info!("starting irc module: {}:{}", irc_config.server, irc_config.port);
                Some(modules::irc::start(irc_config, notify_tx.clone(), daemon_config.clone()))
            } else {
                info!("irc module disabled");
                None
            };

            let telegram_state = if daemon_config.borrow().telegram.enabled {
                info!("starting telegram module");
                Some(modules::telegram::start(
                    daemon_config.borrow().telegram.clone(),
                    notify_tx.clone(),
                    daemon_config.clone(),
                ))
            } else {
                info!("telegram module disabled");
                None
            };

            let listener = UnixListener::bind(&sock)?;
            #[cfg(unix)]
            {
                use std::os::unix::fs::PermissionsExt;
                std::fs::set_permissions(
                    &sock,
                    std::fs::Permissions::from_mode(0o600),
                )
                .ok();
            }

            let shutdown = async {
                let mut sigterm =
                    tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
                        .expect("sigterm");
                let mut sigint =
                    tokio::signal::unix::signal(tokio::signal::unix::SignalKind::interrupt())
                        .expect("sigint");
                tokio::select! {
                    _ = sigterm.recv() => info!("SIGTERM"),
                    _ = sigint.recv() => info!("SIGINT"),
                }
            };
            tokio::pin!(shutdown);

            let mut tick_timer = tokio::time::interval(Duration::from_secs(30));
            tick_timer.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Skip);

            loop {
                tokio::select! {
                    _ = &mut shutdown => break,

                    // Drain module notifications into state
                    Some(notif) = notify_rx.recv() => {
                        state.borrow_mut().notifications.submit(
                            notif.ntype,
                            notif.urgency,
                            notif.message,
                        );
                    }

                    _ = tick_timer.tick() => {
                        if let Err(e) = state.borrow_mut().tick().await {
                            error!("tick: {e}");
                        }
                        if !state.borrow().running {
                            break;
                        }
                    }

                    result = listener.accept() => {
                        match result {
                            Ok((stream, _)) => {
                                let (reader, writer) =
                                    tokio_util::compat::TokioAsyncReadCompatExt::compat(stream)
                                        .split();
                                let network = twoparty::VatNetwork::new(
                                    futures::io::BufReader::new(reader),
                                    futures::io::BufWriter::new(writer),
                                    rpc_twoparty_capnp::Side::Server,
                                    Default::default(),
                                );

                                let daemon_impl = rpc::DaemonImpl::new(
                                    state.clone(),
                                    irc_state.clone(),
                                    telegram_state.clone(),
                                    daemon_config.clone(),
                                );
                                let client: daemon_capnp::daemon::Client =
                                    capnp_rpc::new_client(daemon_impl);

                                let rpc_system = RpcSystem::new(
                                    Box::new(network),
                                    Some(client.client),
                                );
                                tokio::task::spawn_local(rpc_system);
                            }
                            Err(e) => error!("accept: {e}"),
                        }
                    }
                }
            }

            let _ = std::fs::remove_file(sock_path());
            let _ = std::fs::remove_file(pid_path());
            info!("daemon stopped");

            Ok(())
        })
        .await
}

// ── Entry point ──────────────────────────────────────────────────

#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let args: Vec<String> = std::env::args().collect();

    if args.len() < 2 {
        return server_main().await;
    }

    match args[1].as_str() {
        "status" | "user" | "response" | "sleep" | "wake" | "quiet"
        | "consolidating" | "consolidated" | "dream-start" | "dream-end"
        | "stop" | "notify" | "notifications" | "notify-types"
        | "notify-threshold" | "irc" | "telegram" => client_main(args).await,
        _ => {
            eprintln!("usage: poc-daemon [command]");
            eprintln!("  (no args)        Start daemon");
            eprintln!("  status           Query daemon status");
            eprintln!("  user [pane]      Signal user activity");
            eprintln!("  response [pane]  Signal Claude response");
            eprintln!("  notify <type> <urgency> <message>");
            eprintln!("  notifications [min_urgency]");
            eprintln!("  notify-types     List notification types");
            eprintln!("  notify-threshold <type> <level>");
            eprintln!("  sleep [timestamp]");
            eprintln!("  wake / quiet / stop / dream-start / dream-end");
            eprintln!("  irc <join|leave|send|status|log|nick> [args]");
            std::process::exit(1);
        }
    }
}