"""Applications tab: horizontally-scrolling row of every app currently
playing audio (pactl sink-inputs), each with its own volume meter (or
independent L/R pair), mute, live peak bar, and an output-device dropdown."""

from __future__ import annotations

import gi

gi.require_version("Gtk", "4.0")
from gi.repository import Gtk  # noqa: E402

from ui.app_card import ApplicationCard
from ui.scroll_row import ScrollRow


class ApplicationsTab(Gtk.Box):
    def __init__(self, backend, peaks) -> None:
        super().__init__(orientation=Gtk.Orientation.VERTICAL)
        self.add_css_class("sb-tab-page")
        self._backend = backend
        self._peaks = peaks
        self._row = ScrollRow(self._make_card, empty_text="Nothing is playing audio right now")
        self.append(self._row)

    def _make_card(self, item: dict, sinks: list[dict]) -> ApplicationCard:
        return ApplicationCard(self._backend, self._peaks, item, sinks)

    def refresh(self) -> None:
        def got_sinks(sinks: list[dict]) -> None:
            def got_inputs(inputs: list[dict]) -> None:
                self._row.sync(inputs, sinks)
            self._backend.list_sink_inputs(got_inputs)
        self._backend.list_sinks(got_sinks)

    def activate(self) -> None:
        self._row.activate()
        self.refresh()

    def deactivate(self) -> None:
        self._row.deactivate()