use crate::*;

#[derive(Debug, Default)]
pub enum MeteringMode {
    #[default]
    Rms,
    Log10,
}

#[derive(Debug, Default, Clone)]
pub struct Log10Meter(pub f32);
impl Layout<TuiOut> for Log10Meter {}
impl Draw<TuiOut> for Log10Meter {
    fn draw (&self, to: &mut TuiOut) {
        let [x, y, w, h] = to.area();
        let signal = 100.0 - f32::max(0.0, f32::min(100.0, self.0.abs()));
        let v = (signal * h as f32 / 100.0).ceil() as u16;
        let y2 = y + h;
        //to.blit(&format!("\r{v} {} {signal}", self.0), x * 20, y, None);
        for y in y..(y + v) {
            for x in x..(x + w) {
                to.blit(&"▌", x, y2 - y, Some(Style::default().green()));
            }
        }
    }
}

pub fn to_log10 (samples: &[f32]) -> f32 {
    let total: f32 = samples.iter().map(|x|x.abs()).sum();
    let count = samples.len() as f32;
    10. * (total / count).log10()
}

#[derive(Debug, Default, Clone)]
pub struct RmsMeter(pub f32);
impl Layout<TuiOut> for RmsMeter {}
impl Draw<TuiOut> for RmsMeter {
    fn draw (&self, to: &mut TuiOut) {
        let [x, y, w, h] = to.area();
        let signal = f32::max(0.0, f32::min(100.0, self.0.abs()));
        let v = (signal * h as f32).ceil() as u16;
        let y2 = y + h;
        //to.blit(&format!("\r{v} {} {signal}", self.0), x * 30, y, Some(Style::default()));
        for y in y..(y + v) {
            for x in x..(x + w) {
                to.blit(&"▌", x, y2.saturating_sub(y), Some(Style::default().green()));
            }
        }
    }
}

pub fn to_rms (samples: &[f32]) -> f32 {
    let sum = samples.iter()
        .map(|s|*s)
        .reduce(|sum, sample|sum + sample.abs())
        .unwrap_or(0.0);
    (sum / samples.len() as f32).sqrt()
}

pub fn view_meter <'a> (label: &'a str, value: f32) -> impl Content<TuiOut> + 'a {
    col!(
        FieldH(ItemTheme::G[128], label, format!("{:>+9.3}", value)),
        Fixed::XY(if value >= 0.0 { 13 }
            else if value >= -1.0 { 12 }
            else if value >= -2.0 { 11 }
            else if value >= -3.0 { 10 }
            else if value >= -4.0 { 9  }
            else if value >= -6.0 { 8  }
            else if value >= -9.0 { 7  }
            else if value >= -12.0 { 6 }
            else if value >= -15.0 { 5 }
            else if value >= -20.0 { 4 }
            else if value >= -25.0 { 3 }
            else if value >= -30.0 { 2 }
            else if value >= -40.0 { 1 }
            else { 0 }, 1, Tui::bg(if value >= 0.0  { Red }
                else if value >= -3.0 { Yellow }
                else { Green }, ())))
}

pub fn view_meters (values: &[f32;2]) -> impl Content<TuiOut> + use<'_> {
    let left  = format!("L/{:>+9.3}", values[0]);
    let right = format!("R/{:>+9.3}", values[1]);
    Bsp::s(left, right)
}