use crate::*;
use super::*;

pub(crate) fn note_y_iter (note_lo: usize, note_hi: usize, y0: u16) -> impl Iterator<Item=(usize, u16, usize)> {
    (note_lo..=note_hi).rev().enumerate().map(move|(y, n)|(y, y0 + y as u16, n))
}

render!(Tui: (self: PianoHorizontal) => {
    let (color, name, length, looped) = if let Some(phrase) = self.phrase().as_ref().map(|p|p.read().unwrap()) {
        (phrase.color, phrase.name.clone(), phrase.length, phrase.looped)
    } else {
        (ItemPalette::from(TuiTheme::g(64)), String::new(), 0, false)
    };
    //let field = move|x, y|row!(
        //Tui::fg_bg(color.lighter.rgb, color.darker.rgb, Tui::bold(true, x)),
        //Tui::fg_bg(color.lighter.rgb, color.dark.rgb, y),
    //);
    let keys_width = 5;
    let keys     = move||PianoHorizontalKeys(self);
    let timeline = move||PianoHorizontalTimeline(self);
    let notes    = move||PianoHorizontalNotes(self);
    let cursor   = move||PianoHorizontalCursor(self);
    Outer(Style::default().fg(self.color.dark.rgb).bg(self.color.darkest.rgb)).enclose("kyp");
    //with_border(lay!(
        //Push::x(0, row!(
            ////"     ",
            //field("Edit:", name.to_string()), "  ",
            //field("Length:", length.to_string()), "  ",
            //field("Loop:", looped.to_string())
        //)),
        //Padding::xy(0, 1, Fill::xy(Bsp::s(
            //Fixed::y(1, Bsp::e(
                //Fixed::x(self.keys_width, ""),
                //Fill::x(timeline()),
            //)),
            //Bsp::e(
                //Fixed::x(self.keys_width, keys()),
                //Fill::xy(lay!(
                    //&self.size,
                    //Fill::xy(lay!(
                        //Fill::xy(notes()),
                        //Fill::xy(cursor()),
                    //))
                //)),
            //),
        //)))
    //))
});

impl PianoHorizontal {
    /// Draw the piano roll foreground using full blocks on note on and half blocks on legato: █▄ █▄ █▄
    fn draw_bg (buf: &mut BigBuffer, phrase: &MidiClip, zoom: usize, note_len: usize) {
        for (y, note) in (0..127).rev().enumerate() {
            for (x, time) in (0..buf.width).map(|x|(x, x*zoom)) {
                let cell = buf.get_mut(x, y).unwrap();
                cell.set_bg(phrase.color.darkest.rgb);
                cell.set_fg(phrase.color.darker.rgb);
                cell.set_char(if time % 384 == 0 {
                    '│'
                } else if time % 96 == 0 {
                    '╎'
                } else if time % note_len == 0 {
                    '┊'
                } else if (127 - note) % 12 == 1 {
                    '='
                } else {
                    '·'
                });
            }
        }
    }
    /// Draw the piano roll background using full blocks on note on and half blocks on legato: █▄ █▄ █▄
    fn draw_fg (buf: &mut BigBuffer, phrase: &MidiClip, zoom: usize) {
        let style = Style::default().fg(phrase.color.base.rgb);//.bg(Color::Rgb(0, 0, 0));
        let mut notes_on = [false;128];
        for (x, time_start) in (0..phrase.length).step_by(zoom).enumerate() {

            for (y, note) in (0..127).rev().enumerate() {
                if let Some(cell) = buf.get_mut(x, note) {
                    if notes_on[note] {
                        cell.set_char('▂');
                        cell.set_style(style);
                    }
                }
            }

            let time_end = time_start + zoom;
            for time in time_start..time_end.min(phrase.length) {
                for event in phrase.notes[time].iter() {
                    match event {
                        MidiMessage::NoteOn { key, .. } => {
                            let note = key.as_int() as usize;
                            let cell = buf.get_mut(x, note).unwrap();
                            cell.set_char('█');
                            cell.set_style(style);
                            notes_on[note] = true
                        },
                        MidiMessage::NoteOff { key, .. } => {
                            notes_on[key.as_int() as usize] = false
                        },
                        _ => {}
                    }
                }
            }

        }
    }
}

has_size!(<Tui>|self:PianoHorizontal|&self.size);

impl TimeRange for PianoHorizontal {
    fn time_len   (&self) -> &AtomicUsize { self.range.time_len()   }
    fn time_zoom  (&self) -> &AtomicUsize { self.range.time_zoom()  }
    fn time_lock  (&self) -> &AtomicBool  { self.range.time_lock()  }
    fn time_start (&self) -> &AtomicUsize { self.range.time_start() }
    fn time_axis  (&self) -> &AtomicUsize { self.range.time_axis()  }
}
impl NoteRange for PianoHorizontal {
    fn note_lo    (&self) -> &AtomicUsize { self.range.note_lo()    }
    fn note_axis  (&self) -> &AtomicUsize { self.range.note_axis()  }
}
impl NotePoint for PianoHorizontal {
    fn note_len (&self) -> usize { self.point.note_len() }
    fn set_note_len (&self, x: usize) { self.point.set_note_len(x) }
    fn note_point (&self) -> usize { self.point.note_point() }
    fn set_note_point (&self, x: usize) { self.point.set_note_point(x) }
}
impl TimePoint for PianoHorizontal {
    fn time_point (&self) -> usize { self.point.time_point() }
    fn set_time_point (&self, x: usize) { self.point.set_time_point(x) }
}
impl PhraseViewMode for PianoHorizontal {
    fn phrase (&self) -> &Option<Arc<RwLock<MidiClip>>> {
        &self.phrase
    }
    fn phrase_mut (&mut self) -> &mut Option<Arc<RwLock<MidiClip>>> {
        &mut self.phrase
    }
    /// Determine the required space to render the phrase.
    fn buffer_size (&self, phrase: &MidiClip) -> (usize, usize) {
        (phrase.length / self.range.time_zoom().get(), 128)
    }
    fn redraw (&mut self) {
        let buffer = if let Some(phrase) = self.phrase.as_ref() {
            let phrase     = phrase.read().unwrap();
            let buf_size   = self.buffer_size(&phrase);
            let mut buffer = BigBuffer::from(buf_size);
            let note_len   = self.note_len();
            let time_zoom  = self.time_zoom().get();
            self.time_len().set(phrase.length);
            PianoHorizontal::draw_bg(&mut buffer, &phrase, time_zoom, note_len);
            PianoHorizontal::draw_fg(&mut buffer, &phrase, time_zoom);
            buffer
        } else {
            Default::default()
        };
        self.buffer = buffer
    }
    fn set_phrase (&mut self, phrase: Option<&Arc<RwLock<MidiClip>>>) {
        *self.phrase_mut() = phrase.cloned();
        self.color = phrase.map(|p|p.read().unwrap().color)
            .unwrap_or(ItemPalette::from(ItemColor::from(TuiTheme::g(64))));
        self.redraw();
    }
}

impl std::fmt::Debug for PianoHorizontal {
    fn fmt (&self, f: &mut std::fmt::Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
        f.debug_struct("PianoHorizontal")
            .field("time_zoom", &self.range.time_zoom)
            .field("buffer", &format!("{}x{}", self.buffer.width, self.buffer.height))
            .finish()
    }
}
        // Update sequencer playhead indicator
        //self.now().set(0.);
        //if let Some((ref started_at, Some(ref playing))) = self.player.play_phrase {
            //let phrase = phrase.read().unwrap();
            //if *playing.read().unwrap() == *phrase {
                //let pulse = self.current().pulse.get();
                //let start = started_at.pulse.get();
                //let now   = (pulse - start) % phrase.length as f64;
                //self.now().set(now);
            //}
        //}