use crate::*;
use std::fmt::Write;

pub fn view_transport (
    play: bool,
    bpm:  Arc<RwLock<String>>,
    beat: Arc<RwLock<String>>,
    time: Arc<RwLock<String>>,
) -> impl Render<TuiOut> {
    let theme = ItemTheme::G[96];
    Tui::bg(Black, row!(Bsp::a(
        Fill::xy(Align::w(button_play_pause(play))),
        Fill::xy(Align::e(row!(
            FieldH(theme, "BPM",  bpm),
            FieldH(theme, "Beat", beat),
            FieldH(theme, "Time", time),
        )))
    )))
}

pub fn view_status (
    sel: Option<Arc<str>>,
    sr:  Arc<RwLock<String>>,
    buf: Arc<RwLock<String>>,
    lat: Arc<RwLock<String>>,
) -> impl Render<TuiOut> {
    let theme = ItemTheme::G[96];
    Tui::bg(Black, row!(Bsp::a(
        Fill::xy(Align::w(sel.map(|sel|FieldH(theme, "Selected", sel)))),
        Fill::xy(Align::e(row!(
            FieldH(theme, "SR",  sr),
            FieldH(theme, "Buf", buf),
            FieldH(theme, "Lat", lat),
        )))
    )))
}

pub(crate) fn button_play_pause (playing: bool) -> impl Render<TuiOut> {
    let compact = true;//self.is_editing();
    Tui::bg(if playing { Rgb(0, 128, 0) } else { Rgb(128, 64, 0) },
        Either::new(compact,
            Thunk::new(move||Fixed::x(9, Either::new(playing,
                Tui::fg(Rgb(0, 255, 0),   " PLAYING "),
                Tui::fg(Rgb(255, 128, 0), " STOPPED ")))
            ),
            Thunk::new(move||Fixed::x(5, Either::new(playing,
                Tui::fg(Rgb(0, 255, 0),   Bsp::s(" 🭍🭑🬽 ", " 🭞🭜🭘 ",)),
                Tui::fg(Rgb(255, 128, 0), Bsp::s(" ▗▄▖ ", " ▝▀▘ ",))))
            )
        )
    )
}

#[derive(Debug)] pub struct ViewCache {
    pub sr:   Memo<Option<(bool, f64)>, String>,
    pub buf:  Memo<Option<f64>, String>,
    pub lat:  Memo<Option<f64>, String>,
    pub bpm:  Memo<Option<f64>, String>,
    pub beat: Memo<Option<f64>, String>,
    pub time: Memo<Option<f64>, String>,
}

impl Default for ViewCache {
    fn default () -> Self {
        let mut beat = String::with_capacity(16);
        let _ = write!(beat, "{}", Self::BEAT_EMPTY);
        let mut time = String::with_capacity(16);
        let _ = write!(time, "{}", Self::TIME_EMPTY);
        let mut bpm  = String::with_capacity(16);
        let _ = write!(bpm,  "{}", Self::BPM_EMPTY);
        Self {
            beat: Memo::new(None, beat),
            time: Memo::new(None, time),
            bpm:  Memo::new(None, bpm),
            sr:   Memo::new(None, String::with_capacity(16)),
            buf:  Memo::new(None, String::with_capacity(16)),
            lat:  Memo::new(None, String::with_capacity(16)),
        }
    }
}

impl ViewCache {
    pub const BEAT_EMPTY: &'static str = "-.-.--";
    pub const TIME_EMPTY: &'static str = "-.---s";
    pub const BPM_EMPTY:  &'static str = "---.---";

    //pub fn track_counter (cache: &Arc<RwLock<Self>>, track: usize, tracks: usize)
        //-> Arc<RwLock<String>>
    //{
        //let data = (track, tracks);
        //cache.write().unwrap().trks.update(Some(data), rewrite!(buf, "{}/{}", data.0, data.1));
        //cache.read().unwrap().trks.view.clone()
    //}

    //pub fn scene_add (cache: &Arc<RwLock<Self>>, scene: usize, scenes: usize, is_editing: bool)
        //-> impl Render<TuiOut>
    //{
        //let data = (scene, scenes);
        //cache.write().unwrap().scns.update(Some(data), rewrite!(buf, "({}/{})", data.0, data.1));
        //button_3("S", "add scene", cache.read().unwrap().scns.view.clone(), is_editing)
    //}

    pub fn update_clock (cache: &Arc<RwLock<Self>>, clock: &Clock, compact: bool) {
        let rate  = clock.timebase.sr.get();
        let chunk = clock.chunk.load(Relaxed) as f64;
        let lat   = chunk / rate * 1000.;
        let delta = |start: &Moment|clock.global.usec.get() - start.usec.get();
        let mut cache = cache.write().unwrap();
        cache.buf.update(Some(chunk), rewrite!(buf, "{chunk}"));
        cache.lat.update(Some(lat),   rewrite!(buf, "{lat:.1}ms"));
        cache.sr.update(Some((compact, rate)), |buf,_,_|{
            buf.clear();
            if compact {
                write!(buf, "{:.1}kHz", rate / 1000.)
            } else {
                write!(buf, "{:.0}Hz", rate)
            }
        });
        if let Some(now) = clock.started.read().unwrap().as_ref().map(delta) {
            let pulse = clock.timebase.usecs_to_pulse(now);
            let time  = now/1000000.;
            let bpm   = clock.timebase.bpm.get();
            cache.beat.update(Some(pulse), |buf, _, _|{
                buf.clear();
                clock.timebase.format_beats_1_to(buf, pulse)
            });
            cache.time.update(Some(time), rewrite!(buf, "{:.3}s", time));
            cache.bpm.update(Some(bpm),   rewrite!(buf, "{:.3}",  bpm));
        } else {
            cache.beat.update(None, rewrite!(buf, "{}", ViewCache::BEAT_EMPTY));
            cache.time.update(None, rewrite!(buf, "{}", ViewCache::TIME_EMPTY));
            cache.bpm.update(None,  rewrite!(buf, "{}", ViewCache::BPM_EMPTY));
        }
    }

    //pub fn view_h2 (&self) -> impl Render<TuiOut> {
        //let cache = self.project.clock.view_cache.clone();
        //let cache = cache.read().unwrap();
        //add(&Fixed::x(15, Align::w(Bsp::s(
            //FieldH(theme, "Beat", cache.beat.view.clone()),
            //FieldH(theme, "Time", cache.time.view.clone()),
        //))));
        //add(&Fixed::x(13, Align::w(Bsp::s(
            //Fill::x(Align::w(FieldH(theme, "BPM", cache.bpm.view.clone()))),
            //Fill::x(Align::w(FieldH(theme, "SR ", cache.sr.view.clone()))),
        //))));
        //add(&Fixed::x(12, Align::w(Bsp::s(
            //Fill::x(Align::w(FieldH(theme, "Buf", cache.buf.view.clone()))),
            //Fill::x(Align::w(FieldH(theme, "Lat", cache.lat.view.clone()))),
        //))));
        //add(&Bsp::s(
            //Fill::x(Align::w(FieldH(theme, "Selected", Align::w(self.selection().describe(
                //self.tracks(),
                //self.scenes()
            //))))),
            //Fill::x(Align::w(FieldH(theme, format!("History ({})", self.history.len()),
                //self.history.last().map(|last|Fill::x(Align::w(format!("{:?}", last.0)))))))
        //));
        ////if let Some(last) = self.history.last() {
            ////add(&FieldV(theme, format!("History ({})", self.history.len()),
                ////Fill::x(Align::w(format!("{:?}", last.0)))));
        ////}
    //}
}