"""The small cast glyph under the volume slider. Click to disconnect."""

from PyQt6.QtCore import QSize, Qt
from PyQt6.QtGui import QIcon
from PyQt6.QtWidgets import QToolButton

from lintunes.gui.icons import transport_icon

HEIGHT = 18


class CastIndicator(QToolButton):
    """Shows what playback is coming out of, when it isn't this machine.

    Never hidden, even when nothing is connected. `setVisible(False)` would
    take it out of the layout's height budget, which lifts the volume slider
    the instant you connect and drops it again when you disconnect — so idle
    is a visible widget with an empty icon, holding its space.
    """

    def __init__(self, parent=None):
        super().__init__(parent)
        self._connected = False
        self._device = ""
        self.setAutoRaise(True)
        self.setFocusPolicy(Qt.FocusPolicy.NoFocus)
        self.setFixedHeight(HEIGHT)
        self.setIconSize(QSize(HEIGHT, HEIGHT))
        self._apply()

    def set_connected(self, connected: bool, device_name: str = ""):
        self._connected = bool(connected)
        self._device = device_name or ""
        self._apply()

    def refresh_theme(self):
        self._apply()

    def sizeHint(self) -> QSize:
        return QSize(HEIGHT + 6, HEIGHT)

    def _apply(self):
        if self._connected:
            self.setIcon(transport_icon(
                "cast_connected", self.palette().highlight().color()))
            name = self._device or "a Chromecast"
            self.setToolTip(f"Casting to {name} — click to stop")
            self.setCursor(Qt.CursorShape.PointingHandCursor)
            self.setEnabled(True)
        else:
            # Empty icon rather than a hidden widget: holds the slot open.
            self.setIcon(QIcon())
            self.setToolTip("")
            self.setCursor(Qt.CursorShape.ArrowCursor)
            self.setEnabled(False)