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//! Host backend capability metadata and browse card helpers.
use sim_kernel::{Expr, Symbol};
/// Capability advertised by a host backend.
///
/// Each variant names one host-integration feature a backend may support, such
/// as a media direction, hotplug/reconnect handling, or the deterministic fake
/// transport used during validation.
///
/// # Examples
///
/// ```
/// use sim_lib_stream_host::HostBackendCapability;
///
/// let symbol = HostBackendCapability::Duplex.symbol();
/// assert_eq!(symbol.as_qualified_str(), "stream/host-capability/duplex");
/// ```
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum HostBackendCapability {
/// Backend can capture audio from a host input device.
AudioInput,
/// Backend can render audio to a host output device.
AudioOutput,
/// Backend can receive MIDI from a host input port.
MidiInput,
/// Backend can send MIDI to a host output port.
MidiOutput,
/// Backend can drive a single full-duplex (input and output) device.
Duplex,
/// Backend reports device arrival and removal at runtime.
Hotplug,
/// Backend can re-establish a dropped device or peer connection.
Reconnect,
/// Backend can enumerate and plan without opening hardware streams.
Offline,
/// Backend is a deterministic fake used for validation rather than hardware.
Fake,
}
impl HostBackendCapability {
/// Returns the stable qualified symbol naming this capability.
pub fn symbol(self) -> Symbol {
match self {
Self::AudioInput => Symbol::qualified("stream/host-capability", "audio-input"),
Self::AudioOutput => Symbol::qualified("stream/host-capability", "audio-output"),
Self::MidiInput => Symbol::qualified("stream/host-capability", "midi-input"),
Self::MidiOutput => Symbol::qualified("stream/host-capability", "midi-output"),
Self::Duplex => Symbol::qualified("stream/host-capability", "duplex"),
Self::Hotplug => Symbol::qualified("stream/host-capability", "hotplug"),
Self::Reconnect => Symbol::qualified("stream/host-capability", "reconnect"),
Self::Offline => Symbol::qualified("stream/host-capability", "offline"),
Self::Fake => Symbol::qualified("stream/host-capability", "fake"),
}
}
}
/// Emits a browse card for a missing backend capability.
pub fn missing_capability_card_expr(backend: &Symbol, capability: HostBackendCapability) -> Expr {
Expr::Map(vec![
(
Expr::Symbol(Symbol::new("subject")),
Expr::Symbol(backend.clone()),
),
(
Expr::Symbol(Symbol::new("kind")),
Expr::Symbol(Symbol::qualified("stream", "host-missing-capability")),
),
(
Expr::Symbol(Symbol::new("capability")),
Expr::Symbol(capability.symbol()),
),
])
}