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


def build_about_screen() -> QWidget:
    screen = QWidget()
    layout = QVBoxLayout(screen)
    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))
    info.addWidget(_info_row("Сборка", build_info.BUILD_DATE))
    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)
    return screen


def _info_row(label: str, value: str) -> QWidget:
    row = 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()}"