from pathlib import Path
import subprocess

from PySide6.QtCore import Qt, QSettings
from PySide6.QtGui import QFont
from PySide6.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QPushButton, QLabel

import build_info
from ui.confirm_dialog import ConfirmDialog


def build_dev_screen(on_exit) -> QWidget:
    screen = QWidget()
    layout = QVBoxLayout(screen)
    layout.setContentsMargins(0, 0, 0, 0)
    layout.setSpacing(12)

    layout.addWidget(_build_persist_toggle())
    layout.addWidget(_build_sound_toggles())

    hdr = QHBoxLayout()
    hdr.setContentsMargins(0, 0, 0, 0)
    hdr.setSpacing(12)

    exit_btn = QPushButton("Переход к рабочему столу")
    exit_btn.setObjectName("DevExitBtn")
    exit_btn.setMinimumHeight(72)
    exit_btn.clicked.connect(lambda: _confirm_exit(on_exit))

    reboot_btn = QPushButton("Выполнить перезагрузку")
    reboot_btn.setObjectName("DevRebootBtn")
    reboot_btn.setMinimumHeight(72)
    reboot_btn.clicked.connect(_confirm_reboot)

    layout.addLayout(hdr)
    layout.addWidget(exit_btn)
    layout.addWidget(reboot_btn)
    layout.addStretch(1)
    return screen


def _build_persist_toggle() -> QWidget:
    row = QWidget()
    layout = QHBoxLayout(row)
    layout.setContentsMargins(12, 6, 12, 6)
    layout.setSpacing(12)

    lbl = QLabel("Показывать после перезагрузки")
    lbl.setFont(QFont("", 14, 600))

    btn = QPushButton("Выкл")
    btn.setObjectName("SoundToggle")
    btn.setCheckable(True)
    btn.setChecked(_dev_flag_path().exists())
    btn.setMinimumHeight(40)
    btn.setMinimumWidth(110)
    btn.setFont(QFont("", 12, 700))

    def _sync_text(is_checked: bool):
        btn.setText("Вкл" if is_checked else "Выкл")

    def _persist_flag(is_checked: bool):
        flag_path = _dev_flag_path()
        if is_checked:
            flag_path.touch(exist_ok=True)
        else:
            if flag_path.exists():
                flag_path.unlink()

    btn.toggled.connect(_sync_text)
    btn.toggled.connect(_persist_flag)
    _sync_text(btn.isChecked())

    layout.addWidget(lbl)
    layout.addStretch(1)
    layout.addWidget(btn)
    return row


def _build_sound_toggles() -> QWidget:
    settings = QSettings("car_ui", "ui")

    container = QWidget()
    layout = QVBoxLayout(container)
    layout.setContentsMargins(12, 6, 12, 6)
    layout.setSpacing(8)

    layout.addWidget(
        _toggle_row(
            "Премут",
            settings,
            "sound/premute_enabled",
            False,
        )
    )
    layout.addWidget(
        _toggle_row(
            "Ducking",
            settings,
            "sound/ducking_enabled",
            False,
        )
    )
    return container


def _toggle_row(
    label: str,
    settings: QSettings,
    key: str,
    default: bool,
) -> QWidget:
    row = QWidget()
    layout = QHBoxLayout(row)
    layout.setContentsMargins(0, 0, 0, 0)
    layout.setSpacing(12)

    lbl = QLabel(label)
    lbl.setFont(QFont("", 13, 600))

    btn = QPushButton("Выкл")
    btn.setObjectName("SoundToggle")
    btn.setCheckable(True)
    btn.setChecked(_read_bool_setting(settings, key, default))
    btn.setMinimumHeight(40)
    btn.setMinimumWidth(110)
    btn.setFont(QFont("", 12, 700))

    def _sync_text(is_checked: bool):
        btn.setText("Вкл" if is_checked else "Выкл")

    def _persist_flag(is_checked: bool):
        settings.setValue(key, is_checked)

    btn.toggled.connect(_sync_text)
    btn.toggled.connect(_persist_flag)
    _sync_text(btn.isChecked())

    layout.addWidget(lbl)
    layout.addStretch(1)
    layout.addWidget(btn)
    return row


def _read_bool_setting(settings: QSettings, key: str, default: bool) -> bool:
    raw = settings.value(key, default)
    if isinstance(raw, bool):
        return raw
    if isinstance(raw, str):
        return raw.strip().lower() in ("1", "true", "yes", "on")
    try:
        return bool(int(raw))
    except (TypeError, ValueError):
        return default


def _dev_flag_path() -> Path:
    return Path(build_info.__file__).resolve().parent / "dev_mode_enable"


def _confirm_exit(on_exit):
    dialog = ConfirmDialog(
        "Подтверждение",
        "Закрыть приложение и перейти к рабочему столу?",
        "Выйти",
    )
    if dialog.exec() == ConfirmDialog.Accepted:
        on_exit()


def _confirm_reboot():
    dialog = ConfirmDialog(
        "Подтверждение",
        "Выполнить перезагрузку устройства?",
        "Перезагрузить",
        ok_object_name="ConfirmOkDanger",
    )
    if dialog.exec() == ConfirmDialog.Accepted:
        subprocess.run(["sudo", "reboot"], check=False)