use crate::*;
use KeyCode::Char;

pub struct SamplerTui {
    pub state:   Sampler,
    pub cursor:  (usize, usize),
    pub editing: Option<Arc<RwLock<Sample>>>,
    pub mode:    Option<SamplerMode>,
    /// Size of actual notes area
    pub size:    Measure<Tui>,
    /// Lowest note displayed
    pub note_lo: AtomicUsize,
    pub note_pt: AtomicUsize,
    pub color:   ItemPalette
}

impl SamplerTui {
    /// Immutable reference to sample at cursor.
    pub fn sample (&self) -> Option<&Arc<RwLock<Sample>>> {
        for (i, sample) in self.state.mapped.iter().enumerate() {
            if i == self.cursor.0 {
                return sample.as_ref()
            }
        }
        for (i, sample) in self.state.unmapped.iter().enumerate() {
            if i + self.state.mapped.len() == self.cursor.0 {
                return Some(sample)
            }
        }
        None
    }
}

//from_jack!(|jack|SamplerTui{
    //Self {
        //cursor:  (0, 0),
        //editing: None,
        //mode:    None,
        //size:    Measure::new(),
        //note_lo: 36.into(),
        //note_pt: 36.into(),
        //color:   ItemPalette::from(Color::Rgb(64, 128, 32)),
        //state:   Sampler::new(jack, &"sampler", &[], &[&[], &[]], &[&[], &[]])?,
    //}
//});

render!(<Tui>|self: SamplerTui|{
    let keys_width  = 5;
    let keys        = move||"";//SamplerKeys(self);
    let fg          = self.color.base.rgb;
    let bg          = self.color.darkest.rgb;
    let border      = Fill::wh(Outer(Style::default().fg(fg).bg(bg)));
    let with_border = |x|lay!([border, Fill::wh(&x)]);
    let with_size   = |x|lay!([self.size, x]);
    Tui::bg(bg, Fill::wh(with_border(Bsp::s(
        Tui::fg(self.color.light.rgb, Tui::bold(true, "Sampler")),
        with_size(Tui::shrink_y(1, Bsp::e(
            Fixed::w(keys_width, keys()),
            Fill::wh(render(|to: &mut TuiOutput|Ok({
                let x           = to.area.x();
                let bg_base     = self.color.darkest.rgb;
                let bg_selected = self.color.darker.rgb;
                let style_empty = Style::default().fg(self.color.base.rgb);
                let style_full  = Style::default().fg(self.color.lighter.rgb);
                let note_hi     = self.note_hi();
                let note_pt     = self.note_point();
                for y in 0..self.size.h() {
                    let note  = note_hi - y as usize;
                    let bg    = if note == note_pt { bg_selected } else { bg_base };
                    let style = Some(style_empty.bg(bg));
                    to.blit(&" (no sample) ", x, to.area.y() + y as u16, style)
                }
            })))
        ))),
    ))))
});

impl NoteRange for SamplerTui {
    fn note_lo (&self) -> &AtomicUsize { &self.note_lo }
    fn note_axis (&self) -> &AtomicUsize { &self.size.y  }
}

impl NotePoint for SamplerTui {
    fn note_len (&self) -> usize {0/*TODO*/}
    fn set_note_len (&self, x: usize) {}
    fn note_point (&self) -> usize { self.note_pt.load(Relaxed) }
    fn set_note_point (&self, x: usize) { self.note_pt.store(x, Relaxed); }
}

pub enum SamplerMode {
    // Load sample from path
    Import(usize, FileBrowser),
}

handle!(<Tui>|self: SamplerTui, input|SamplerTuiCommand::execute_with_state(self, input));

pub enum SamplerTuiCommand {
    Import(FileBrowserCommand),
    SelectNote(usize),
    SelectField(usize),
    Sample(SamplerCommand),
}

input_to_command!(SamplerTuiCommand: <Tui>|state: SamplerTui, input|match state.mode {
    Some(SamplerMode::Import(..)) => Self::Import(
        FileBrowserCommand::input_to_command(state, input)?
    ),
    _ => match input.event() {
        // load sample
        key_pat!(Shift-Char('L')) => {
            Self::Import(FileBrowserCommand::Begin)
        },
        key_pat!(KeyCode::Up) => {
            Self::SelectNote(state.note_point().overflowing_add(1).0.min(127))
        },
        key_pat!(KeyCode::Down) => {
            Self::SelectNote(state.note_point().overflowing_sub(1).0.min(127))
        },
        _ => return None
    }
        //key_pat!(KeyCode::Char('p')) => if let Some(sample) = self.sample() {
            //voices.write().unwrap().push(Sample::play(sample, 0, &100.into()));
        //},
        //key_pat!(KeyCode::Char('a')) => {
            //let sample = Arc::new(RwLock::new(Sample::new("", 0, 0, vec![])));
            //self.mode = None;//Some(Exit::boxed(AddSampleModal::new(&sample, &voices)?));
            //unmapped.push(sample);
        //},
        //key_pat!(KeyCode::Char('r')) => if let Some(sample) = self.sample() {
            //self.mode = None;//Some(Exit::boxed(AddSampleModal::new(&sample, &voices)?));
        //},
        //key_pat!(KeyCode::Enter) => if let Some(sample) = self.sample() {
            //self.editing = Some(sample.clone());
        //},
        //_ => {
            //return Ok(None)
        //}
    //}
});

command!(|self: SamplerTuiCommand, state: SamplerTui|match self {
    Self::Import(FileBrowserCommand::Begin) => {
        let voices = &state.state.voices;
        let sample = Arc::new(RwLock::new(Sample::new("", 0, 0, vec![])));
        state.mode = Some(SamplerMode::Import(0, FileBrowser::new(None)?));
        None
    },
    Self::SelectNote(index) => {
        let old = state.note_point();
        state.set_note_point(index);
        Some(Self::SelectNote(old))
    },
    Self::Sample(cmd) => cmd.execute(&mut state.state)?.map(Self::Sample),
    _ => todo!()
});