//! Host-independent controls. Levels in dB, times in milliseconds, frequencies in Hz.
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq, Eq, Default)]
pub enum Source {
    /// Pitch and note starts are detected from the incoming bass.
    #[default]
    Audio,
    /// Notes come from MIDI note input; the audio only supplies the band above the split.
    Midi,
}

#[derive(Debug, Clone, Copy, Serialize, Deserialize, PartialEq)]
#[serde(deny_unknown_fields)]
pub struct Settings {
    pub source: Source,
    /// Peak level of the new sub in dBFS, the same for every note.
    pub level: f32,
    /// Crossover frequency: below it the original sub is replaced.
    pub split: f32,
    /// 0 % holds a constant level per note; 100 % follows the original low band's shape.
    pub dynamics: f32,
    /// Soft saturation of the sine, adding upper harmonics for small speakers.
    pub drive: f32,
    pub octave: i32,
    /// Pitch slide time between overlapping notes.
    pub glide: f32,
    /// Start phase in degrees on every note start.
    pub phase: f32,
    /// Detection threshold in dBFS for note starts (Audio source).
    pub gate: f32,
    /// Amount of the original low band that is kept under the new sub.
    pub keep: f32,
    pub output: f32,
    /// Restart the sine at `phase` on every note, so each note and kick hit lines up the same.
    pub retrigger: bool,
    /// Round detected pitch to the nearest semitone.
    pub snap: bool,
    pub bypass: bool,
}
impl Default for Settings {
    fn default() -> Self {
        Self {
            source: Source::Audio,
            level: -9.,
            split: 90.,
            dynamics: 0.,
            drive: 0.,
            octave: 0,
            glide: 0.,
            phase: 0.,
            gate: -42.,
            keep: 0.,
            output: 0.,
            retrigger: true,
            snap: true,
            bypass: false,
        }
    }
}
impl Settings {
    pub fn validate(&self) -> Result<(), &'static str> {
        let finite = [
            self.level,
            self.split,
            self.dynamics,
            self.drive,
            self.glide,
            self.phase,
            self.gate,
            self.keep,
            self.output,
        ]
        .iter()
        .all(|v| v.is_finite());
        if !finite {
            return Err("non-finite setting");
        }
        let ok = (-30.0..=0.).contains(&self.level)
            && (40.0..=200.).contains(&self.split)
            && (0.0..=100.).contains(&self.dynamics)
            && (0.0..=100.).contains(&self.drive)
            && (-2..=1).contains(&self.octave)
            && (0.0..=200.).contains(&self.glide)
            && (0.0..=360.).contains(&self.phase)
            && (-60.0..=-20.).contains(&self.gate)
            && (0.0..=100.).contains(&self.keep)
            && (-12.0..=12.).contains(&self.output);
        if ok {
            Ok(())
        } else {
            Err("setting out of range")
        }
    }
}