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use envelope_detector::{Frame, Mode, EnvelopeDetector, Peak, Rms};
use std;
use time::Ms;

/// A peak `Detector` type.
pub use envelope_detector::PeakEnvelopeDetector;


/// Envelope **Detector** types that may be used by the **Compressor**.
pub trait Detector<F>
    where F: Frame,
{
    /// The detection **Mode** used by the **Detector**.
    type Mode: Mode<F>;
    /// Mutably borrow the **MultiChannelEnvelopeDetector**.
    fn detector(&mut self) -> &mut EnvelopeDetector<F, Self::Mode>;
}


/// An RMS envelope detector with a window adjustable in milliseconds.
#[derive(Clone)]
pub struct RmsEnvelopeDetector<F>
    where F: Frame,
{
    /// The multi-channel RMS envelope detector.
    pub rms: EnvelopeDetector<F, Rms<F>>,
    /// The duration of the RMS window used by the detector.
    pub window_ms: Ms,
}

impl<F> std::fmt::Debug for RmsEnvelopeDetector<F>
    where F: Frame + std::fmt::Debug,
          F::Float: std::fmt::Debug,
{
    fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
        write!(f, "RmsEnvelopeDetector {{ rms: {:?}, window_ms: {:?} }}", &self.rms, &self.window_ms)
    }
}


impl<F> Detector<F> for PeakEnvelopeDetector<F>
    where F: Frame,
{
    type Mode = Peak;
    fn detector(&mut self) -> &mut Self {
        self
    }
}

impl<F> Detector<F> for RmsEnvelopeDetector<F>
    where F: Frame,
{
    type Mode = Rms<F>;
    fn detector(&mut self) -> &mut EnvelopeDetector<F, Self::Mode> {
        &mut self.rms
    }
}