pragma Singleton

import Quickshell
import Quickshell.Services.Pipewire
import qs.config

// The default audio sink. Quickshell talks to pipewire directly, so there is no
// wpctl or pactl to shell out to and no polling: the properties below change as
// the graph does, whoever moved them.
//
// Everything is expressed against the default sink rather than a remembered
// one, so switching outputs — plugging in a headset, say — moves the panel with
// the sound.
Singleton {
    id: root

    readonly property PwNode sink: Pipewire.defaultAudioSink

    // Pipewire objects only carry live properties while something is tracking
    // them, so `audio` is null until the tracker below binds the node.
    readonly property bool available: Config.showVolume && root.sink !== null && root.sink.ready && root.sink.audio !== null

    // 0-1 for the usable range, though pipewire allows more and another client
    // may well have set more. Reported as-is; the slider is what clamps.
    readonly property real volume: root.available ? root.sink.audio.volume : 0
    readonly property bool muted: root.available ? root.sink.audio.muted : false

    function setVolume(value: real): void {
        if (!root.available)
            return;

        root.sink.audio.volume = Math.max(0, Math.min(1, value));
    }

    // Raising the volume from silence unmutes: a volume key that appears to do
    // nothing is worse than one that does slightly more than it said.
    function step(delta: real): void {
        if (!root.available)
            return;

        if (delta > 0 && root.muted)
            root.setMuted(false);

        root.setVolume(root.volume + delta);
    }

    function setMuted(muted: bool): void {
        if (root.available)
            root.sink.audio.muted = muted;
    }

    function toggleMute(): void {
        root.setMuted(!root.muted);
    }

    PwObjectTracker {
        objects: root.sink ? [root.sink] : []
    }
}