"""Ncurses UI adapter skeleton for the installer runner."""
from __future__ import annotations

from ..runner import InstallerRunner
from ..state import InstallerState
from ..milestone import Milestone


class NcursesUI:
    """Minimal ncurses adapter that listens to runner events."""

    def __init__(self, runner: InstallerRunner):
        self.runner = runner
        self._bind_runner()

    def _bind_runner(self) -> None:
        self.runner.on('on_enter_milestone', self.on_enter_milestone)
        self.runner.on('on_validation_error', self.on_validation_error)
        self.runner.on('on_progress', self.on_progress)
        self.runner.on('on_complete', self.on_complete)

    # Event handlers (override in concrete UI)
    def on_enter_milestone(self, milestone: Milestone, state: InstallerState) -> None:
        pass

    def on_validation_error(self, milestone: Milestone | None, state: InstallerState, errors: list[str]) -> None:
        pass

    def on_progress(self, milestone: Milestone, state: InstallerState, message: str, percent: float | None) -> None:
        pass

    def on_complete(self, milestone: Milestone | None, state: InstallerState) -> None:
        pass

    def start(self, start_id: str | None = None) -> bool:
        """Run the installer without a GUI main loop."""
        return self.runner.run(start_id=start_id)