"""Tkinter UI adapter skeleton for the installer runner."""

from __future__ import annotations

import threading
import tkinter as tk

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


class TkinterUI:
    """Minimal Tkinter adapter that listens to runner events."""

    def __init__(self, runner: InstallerRunner, root: tk.Tk | None = None):
        self.runner = runner
        self.root = root or tk.Tk()
        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) -> None:
        """Start the runner in a background thread and enter Tk mainloop."""
        threading.Thread(
            target=self.runner.run, kwargs={"start_id": start_id}, daemon=True
        ).start()
        self.root.mainloop()