"""Main daemon loop that ties detection, state machine, overlay, and sound together."""
import logging
import signal
import time

from Cocoa import NSApplication, NSRunLoop, NSDate

from cursor_flasher.config import Config, load_config
from cursor_flasher.detector import CursorDetector
from cursor_flasher.overlay import OverlayManager
from cursor_flasher.sound import play_alert
from cursor_flasher.state import FlasherState, StateMachine

logger = logging.getLogger("cursor_flasher")


class FlasherDaemon:
    def __init__(self, config: Config):
        self.config = config
        self.state_machine = StateMachine(cooldown=config.cooldown)
        self.detector = CursorDetector()
        self.overlay = OverlayManager(config)
        self._running = False
        self._waiting_since: float | None = None

    def run(self) -> None:
        """Run the main loop. Blocks until stopped."""
        NSApplication.sharedApplication()
        self._running = True

        signal.signal(signal.SIGTERM, self._handle_signal)
        signal.signal(signal.SIGINT, self._handle_signal)

        logger.info("Cursor Flasher daemon started")

        while self._running:
            self._tick()
            NSRunLoop.currentRunLoop().runUntilDate_(
                NSDate.dateWithTimeIntervalSinceNow_(self.config.poll_interval)
            )

        self.overlay.hide()
        logger.info("Cursor Flasher daemon stopped")

    def stop(self) -> None:
        self._running = False

    def _tick(self) -> None:
        signals = self.detector.poll()

        if signals is None:
            if self.state_machine.state == FlasherState.WAITING_FOR_USER:
                self.state_machine.dismiss()
                self.overlay.hide()
                self._waiting_since = None
            return

        changed = self.state_machine.update(
            agent_working=signals.agent_working,
            approval_needed=signals.approval_needed,
        )

        if not changed:
            if (
                self.state_machine.state == FlasherState.WAITING_FOR_USER
                and self._waiting_since is not None
            ):
                elapsed = time.monotonic() - self._waiting_since
                if elapsed > self.config.auto_dismiss:
                    self.state_machine.dismiss()
                    self.overlay.hide()
                    self._waiting_since = None
            return

        match self.state_machine.state:
            case FlasherState.WAITING_FOR_USER:
                pid = self.detector._pid
                if pid is not None:
                    self.overlay.show(pid)
                    play_alert(self.config)
                    self._waiting_since = time.monotonic()
            case FlasherState.AGENT_WORKING | FlasherState.IDLE:
                self.overlay.hide()
                self._waiting_since = None

    def _handle_signal(self, signum, frame):
        logger.info(f"Received signal {signum}, shutting down")
        self.stop()


def run_daemon() -> None:
    """Entry point for the daemon."""
    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s [%(name)s] %(levelname)s: %(message)s",
    )
    config = load_config()
    daemon = FlasherDaemon(config)
    daemon.run()