from PySide6.QtWidgets import (
    QWidget,
    QLabel,
    QVBoxLayout,
    QHBoxLayout,
    QScrollArea,
)
from PySide6.QtCore import Qt, Signal
from PySide6.QtGui import QFont, QGuiApplication
from PySide6.QtWidgets import QScroller
import build_info


class AboutScreen(QWidget):
    dev_unlocked = Signal()

    def __init__(self):
        super().__init__()
        self._dev_taps = 0
        self._dev_hint = QLabel("")

        layout = QVBoxLayout(self)
        layout.setContentsMargins(0, 0, 0, 0)
        layout.setSpacing(12)

        scroll = QScrollArea()
        scroll.setWidgetResizable(True)
        scroll.setFrameShape(QScrollArea.NoFrame)
        scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)

        scroller = QScroller.scroller(scroll.viewport())
        scroller.grabGesture(
            scroll.viewport(),
            QScroller.LeftMouseButtonGesture
        )

        content = QWidget()
        content_layout = QVBoxLayout(content)
        content_layout.setContentsMargins(0, 0, 0, 0)
        content_layout.setSpacing(12)

        info = QVBoxLayout()
        info.setContentsMargins(0, 0, 0, 0)
        info.setSpacing(8)

        info.addWidget(_info_row("Приложение", build_info.APP_NAME))
        info.addWidget(_info_row("Версия", build_info.VERSION))
        build_row = _info_row("Сборка", build_info.BUILD_DATE, clickable=True)
        build_row.clicked.connect(self._on_build_tap)
        info.addWidget(build_row)
        self._dev_hint.setObjectName("DevHint")
        self._dev_hint.setFont(QFont("", 12, 600))
        self._dev_hint.setAlignment(Qt.AlignRight | Qt.AlignVCenter)
        info.addWidget(self._dev_hint)
        info.addWidget(_info_row("Коммит", build_info.GIT_HASH))
        info.addWidget(_info_row("Устройство", build_info.get_device_model()))
        info.addWidget(_info_row("ОС", build_info.get_os_pretty_name()))
        info.addWidget(_info_row("Ядро", build_info.get_kernel_version()))
        info.addWidget(_info_row("RAM (используется/всего)", build_info.get_ram_info()))
        info.addWidget(_info_row("Диск (используется/всего)", build_info.get_disk_info()))
        info.addWidget(_info_row("Экран", build_info.get_display_resolution()))
        info.addWidget(_info_row("Экран (факт)", _get_runtime_resolution()))
        info.addWidget(_info_row("Серийный номер", build_info.get_serial_number()))
        info.addWidget(_info_row("IP", build_info.get_ip_address()))
        info.addWidget(_info_row("Температура CPU", build_info.get_cpu_temp()))

        content_layout.addLayout(info)
        content_layout.addStretch(1)

        scroll.setWidget(content)
        layout.addWidget(scroll)

    def _on_build_tap(self):
        self._dev_taps += 1
        remaining = 5 - self._dev_taps
        if remaining > 0:
            self._dev_hint.setText(f"Осталось {remaining} нажат.")
            return
        if self._dev_taps >= 5:
            self._dev_taps = 0
            self._dev_hint.setText("Режим разработчика включен")
            self.dev_unlocked.emit()


class _ClickableRow(QWidget):
    clicked = Signal()

    def __init__(self):
        super().__init__()
        self.setCursor(Qt.PointingHandCursor)

    def mousePressEvent(self, event):
        if event.button() == Qt.LeftButton:
            self.clicked.emit()
        super().mousePressEvent(event)


def _info_row(label: str, value: str, clickable: bool = False) -> QWidget:
    row = _ClickableRow() if clickable else QWidget()
    layout = QHBoxLayout(row)
    layout.setContentsMargins(12, 6, 12, 6)
    layout.setSpacing(12)

    lbl = QLabel(label)
    lbl.setFont(QFont("", 15, 600))

    val = QLabel(value)
    val.setFont(QFont("", 15))
    val.setAlignment(Qt.AlignRight | Qt.AlignVCenter)

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


def _get_runtime_resolution() -> str:
    app = QGuiApplication.instance()
    if app is None:
        return "—"
    screen = app.primaryScreen()
    if screen is None:
        return "—"
    size = screen.size()
    if size.isEmpty():
        return "—"
    return f"{size.width()}x{size.height()}"