use std::sync::mpsc::{Sender, Receiver};
use thiserror::Error;

#[derive(Error, Debug)]
pub enum AudioError {
    #[error("Failed to initialize audio backend: {0}")]
    Init(String),
    #[error("Audio device error: {0}")]
    Device(String),
    #[error("Stream error: {0}")]
    Stream(String),
    #[error("Audio buffer overflow/underflow")]
    BufferError,
    #[error("Other audio error: {0}")]
    Other(String),
}

pub trait AudioBackend: Send + Sync {
    /// Starts capturing raw PCM audio from the input device (microphone),
    /// sending chunks of samples (e.g. `Vec<i16>`) to the provided Sender.
    fn start_capture(&self, tx: Sender<Vec<i16>>, target_node: Option<String>) -> Result<(), AudioError>;

    /// Starts playing back raw PCM audio to the output device (speaker),
    /// reading mixed/incoming chunks of samples from the provided Receiver.
    fn start_playback(&self, rx: Receiver<Vec<i16>>, target_node: Option<String>) -> Result<(), AudioError>;

    /// Stops both capture and playback streams.
    fn stop(&self) -> Result<(), AudioError>;
}

pub mod pipewire_impl;