"""Einstellungs-Dialog für whisper-local (Windows)."""

from __future__ import annotations

import ctypes
import threading
from typing import Callable

import sounddevice as sd

from whisper_local.config import Config, save_config
from whisper_local.tray._theme import apply_system_theme


def pynput_to_evdev_key(key) -> str:
    """Konvertiert pynput-Key zu evdev-Key-Namen (z.B. Key.f12 → 'KEY_F12')."""
    from pynput.keyboard import Key, KeyCode

    if isinstance(key, Key):
        return f"KEY_{key.name.upper()}"
    if isinstance(key, KeyCode) and key.char:
        return f"KEY_{key.char.upper()}"
    return ""


def check_hotkey_conflict(evdev_name: str) -> bool:
    """Gibt True zurück wenn die Taste per Win32-RegisterHotKey belegt ist."""
    from whisper_local.hotkey._pynput import _evdev_to_pynput_key
    from pynput.keyboard import Key

    try:
        pynput_key = _evdev_to_pynput_key(evdev_name)
    except ValueError:
        return False

    if not isinstance(pynput_key, Key):
        return False

    vk = getattr(pynput_key.value, "vk", None)
    if vk is None:
        return False

    HOTKEY_ID = 0x7FFF
    user32 = ctypes.windll.user32
    if user32.RegisterHotKey(None, HOTKEY_ID, 0, vk):
        user32.UnregisterHotKey(None, HOTKEY_ID)
        return False
    return True


def list_microphones() -> list[tuple[str, int]]:
    """Gibt Liste aller Eingabegeräte als (name, index) zurück."""
    devices = sd.query_devices()
    return [
        (dev["name"], idx)
        for idx, dev in enumerate(devices)
        if dev["max_input_channels"] > 0
    ]


class SettingsDialog:
    """Einstellungs-Dialog (läuft in eigenem Thread)."""

    def __init__(self, config: Config, on_save: Callable[[Config], None]):
        self._config = config
        self._on_save = on_save

    def open(self) -> None:
        """Öffnet den Dialog in einem Daemon-Thread."""
        thread = threading.Thread(target=self._run, daemon=True)
        thread.start()

    def _run(self) -> None:
        import tkinter as tk
        from tkinter import ttk

        root = tk.Tk()
        root.title("whisper-local – Einstellungen")
        root.resizable(False, False)
        apply_system_theme(root)

        frame = ttk.Frame(root, padding=16)
        frame.pack(fill=tk.BOTH, expand=True)

        # --- Hotkey ---
        ttk.Label(frame, text="Hotkey").grid(row=0, column=0, sticky=tk.W, pady=4)
        hotkey_var = tk.StringVar(value=self._config.hotkey)
        ttk.Label(frame, textvariable=hotkey_var, width=14, relief="sunken").grid(
            row=0, column=1, padx=8
        )

        conflict_var = tk.StringVar()
        ttk.Label(frame, textvariable=conflict_var, foreground="orange").grid(
            row=1, column=0, columnspan=3, sticky=tk.W
        )

        def record_hotkey():
            hotkey_var.set("...")
            conflict_var.set("")

            captured: list[str] = []

            def on_press(key):
                evdev = pynput_to_evdev_key(key)
                if evdev:
                    captured.append(evdev)
                return False  # Listener stoppen

            def listen():
                from pynput.keyboard import Listener
                with Listener(on_press=on_press) as lst:
                    lst.join()
                if captured:
                    evdev = captured[0]
                    root.after(0, lambda: hotkey_var.set(evdev))
                    if check_hotkey_conflict(evdev):
                        root.after(
                            0,
                            lambda: conflict_var.set(
                                "⚠ Taste ist von einer anderen App belegt (Win32-Hotkeys)"
                            ),
                        )

            threading.Thread(target=listen, daemon=True).start()

        ttk.Button(frame, text="Aufzeichnen", command=record_hotkey).grid(
            row=0, column=2, padx=4
        )

        # --- Mikrofon ---
        ttk.Label(frame, text="Mikrofon").grid(row=2, column=0, sticky=tk.W, pady=4)
        mics = list_microphones()
        mic_names = ["Standard"] + [name for name, _ in mics]
        current_mic = self._config.microphone or "Standard"
        mic_var = tk.StringVar(value=current_mic)
        ttk.Combobox(
            frame, textvariable=mic_var, values=mic_names, state="readonly", width=32
        ).grid(row=2, column=1, columnspan=2, sticky=tk.W, padx=4)

        # --- Buttons ---
        btn_frame = ttk.Frame(frame)
        btn_frame.grid(row=3, column=0, columnspan=3, pady=12, sticky=tk.E)

        def save():
            new_config = Config(
                hotkey=hotkey_var.get(),
                whisper_model=self._config.whisper_model,
                language=self._config.language,
                compute_type=self._config.compute_type,
                sample_rate=self._config.sample_rate,
                channels=self._config.channels,
                min_duration=self._config.min_duration,
                microphone="" if mic_var.get() == "Standard" else mic_var.get(),
            )
            save_config(new_config)
            self._on_save(new_config)
            root.destroy()

        ttk.Button(btn_frame, text="Speichern", command=save).pack(side=tk.RIGHT, padx=4)
        ttk.Button(btn_frame, text="Abbrechen", command=root.destroy).pack(side=tk.RIGHT)

        root.mainloop()