mod plugin;
pub use self::plugin::*;
mod sampler;
pub use self::sampler::*;

use crate::prelude::*;

pub struct Chain {
    pub name:    String,
    pub focused: bool,
    pub focus:   usize,
    pub items:   Vec<Box<dyn Device>>,
    pub view:    ChainView
}

pub enum ChainView {
    Hidden,
    Compact,
    Row,
    Column,
}

impl Chain {
    pub fn new (name: &str, items: Option<Vec<Box<dyn Device>>>) -> Result<DynamicDevice<Self>, Box<dyn Error>> {
        Ok(DynamicDevice::new(render, handle, process, Self {
            name: name.into(),
            focused: false,
            focus: 0,
            items: items.unwrap_or_else(||vec![]),
            view: ChainView::Column
        }))
    }
}

impl PortList for Chain {
    fn midi_ins (&self) -> Usually<Vec<String>> {
        if let Some(device) = self.items.get(0) {
            device.midi_ins()
        } else {
            Ok(vec![])
        }
    }
    fn audio_outs (&self) -> Usually<Vec<String>> {
        if let Some(device) = self.items.get(self.items.len().saturating_sub(1)) {
            device.audio_outs()
        } else {
            Ok(vec![])
        }
    }
}

pub fn process (_: &mut Chain, _: &Client, _: &ProcessScope) -> Control {
    Control::Continue
}

pub fn render (state: &Chain, buf: &mut Buffer, area: Rect)
    -> Usually<Rect>
{
    let Rect { x, y, .. } = area;
    let selected = Some(if state.focused {
        Style::default().green().not_dim()
    } else {
        Style::default().green().dim()
    });
    Ok(match state.view {
        ChainView::Hidden => Rect { x, y, width: 0, height: 0 },
        ChainView::Compact => {
            let area = Rect { x, y, width: (state.name.len() + 4) as u16, height: 3 };
            buf.set_string(area.x + 2, area.y + 1, &state.name, Style::default());
            draw_box_styled(buf, area, selected)
        },
        ChainView::Row => {
            draw_box_styled(buf, area, selected);
            let (area, _) = Row::draw(buf, area, &state.items, 0)?;
            area
        },
        ChainView::Column => {
            draw_as_column(state, buf, area, selected)?
        },
    })
    //let area = Rect { x, y, width: 40, height: 30 };
    //let mut y = area.y;
    //buf.set_string(area.x, y, "│", Style::default().black());
    //buf.set_string(area.x + area.width - 1, y, "│", Style::default().black());
    //buf.set_string(area.x + 2, y, "Input...", Style::default().dim());
    //let mut x = 0u16;
    //for (i, device) in state.items.iter().enumerate() {
        //let result = device.render(buf, Rect {
            //x: area.x,
            //y,
            //width: area.width,
            //height: 21//area.height.saturating_sub(y)
        //})?;
        //if i == state.focus {
            //if state.focused {
                //draw_box_styled(buf, result, Some(Style::default().green().not_dim()))
            //} else {
                //draw_box_styled_dotted(buf, result, Some(Style::default().green().dim()))
            //};
        //};
        ////let result = Rect { x: 0, y: 0, width: result.width, height: 21 };
        //x = x.max(result.width);
        //y = y + result.height;
        ////y = y + 1;
        //buf.set_string(area.x, y, "│", Style::default().black());
        //buf.set_string(area.x + area.width - 1, y, "│", Style::default().black());
        //buf.set_string(area.x + 2, y, "      Patch in ┐ │ └ Patch out", Style::default().dim());
        //y = y + 1;
        ////buf.set_string(area.x, y, format!("{y}---BOT---"), Style::default().red());
        ////buf.set_string(area.x + area.width - 1, area.y + 1, "│", Style::default().black());
        ////buf.set_string(area.x + 2, y, "Patch...", Style::default().dim());
    //}
    //Ok(draw_box(buf, Rect {
        //x: area.x,
        //y: area.y,
        //width:  area.width,
        //height: y - area.y,
    //}))
}

pub fn draw_as_row (
    state: &Chain, buf: &mut Buffer, area: Rect, _: Option<Style>
) -> Usually<(Rect, Vec<Rect>)> {
    let Rect { mut x, y, width, height } = area;
    x = x + 1;
    let mut h = 0u16;
    let mut frames = vec![];
    for (i, device) in state.items.iter().enumerate() {
        let mut x2 = 1u16;
        let mut y2 = 1u16;
        for port in device.midi_ins()?.iter() {
            port.blit(buf, x, y + y2, Some(Style::default()));
            x2 = x2.max(port.len() as u16);
            y2 = y2 + 1;
        }
        for port in device.audio_ins()?.iter() {
            port.blit(buf, x, y + y2, Some(Style::default()));
            x2 = x2.max(port.len() as u16);
            y2 = y2 + 1;
        }
        let width = width.saturating_sub(x).saturating_sub(x2);
        let style = Some(if i == state.focus {
            if state.focused {
                Style::default().green().not_dim()
            } else {
                Style::default().green().dim()
            }
        } else {
            Style::default().dim()
        });
        lozenge_left(buf, x + x2, y, height, style);
        let frame = device.render(buf, Rect { x: x + x2, y, width, height })?;
        lozenge_right(buf, x + x2 + frame.width - 1, y, height, style);
        let mut y2 = 1u16;
        for port in device.midi_outs()?.iter() {
            port.blit(buf, x + x2 + frame.width, y + y2, Some(Style::default()));
            x2 = x2.max(port.len() as u16);
            y2 = y2 + 1;
        }
        for port in device.audio_outs()?.iter() {
            port.blit(buf, x + x2 + frame.width, y + y2, Some(Style::default()));
            x2 = x2.max(port.len() as u16);
            y2 = y2 + 1;
        }
        frames.push(frame);
        h = h.max(frame.height);
        x = x + frame.width;
    }
    Ok((area, frames))
}

pub fn draw_as_column (
    state: &Chain, buf: &mut Buffer, area: Rect, selected: Option<Style>
) -> Usually<Rect> {
    let Rect { x, mut y, width, height } = area;
    //let (area, areas) = Column::draw(buf, area, &state.items, 0)?;
    let mut w = 0u16;
    let mut frames = vec![];
    for device in state.items.iter() {
        let style_midi  = Style::default().black().bold().on_green();
        let style_audio = Style::default().black().bold().on_red();
        let midi_ins    = device.midi_ins()?;
        let midi_outs   = device.midi_outs()?;
        let audio_ins   = device.audio_ins()?;
        let audio_outs  = device.audio_outs()?;
        y = y + midi_ins.len() as u16;
        let frame = device.render(buf, Rect {
            x, y, width, height: height.saturating_sub(y)
        })?;
        frames.push(frame);
        w = w.max(frame.width);
        y = y - midi_ins.len() as u16;
        for port in midi_ins.iter() {
            buf.set_string(x + frame.width - 10, y, &format!(" <i> MIDI {port} "), style_midi);
            y = y + 1;
        }
        y = y - audio_ins.len() as u16;
        for port in audio_ins.iter() {
            buf.set_string(x + frame.width - 10, y, &format!(" <i> MIDI {port} "), style_audio);
            y = y + 1;
        }
        y = y + frame.height - 1;
        y = y + midi_outs.len() as u16;
        for port in midi_outs.iter() {
            buf.set_string(x + 2, y, &format!(" <o> MIDI {port} "), style_midi);
            y = y + 1;
        }
        y = y + audio_outs.len() as u16;
        for port in audio_outs.iter() {
            buf.set_string(x + 2, y, &format!(" <o> Audio {port} "), style_audio);
            y = y + 1;
        }
    }
    draw_box_styled(buf, frames[state.focus], selected);
    Ok(area)
}

impl Focus for Chain {
    fn unfocus (&mut self) {
        self.focused = false
    }
    fn focused (&self) -> Option<&Box<dyn Device>> {
        match self.focused {
            true  => self.items.get(self.focus),
            false => None
        }
    }
    fn focused_mut (&mut self) -> Option<&mut Box<dyn Device>> {
        match self.focused {
            true  => self.items.get_mut(self.focus),
            false => None
        }
    }
    fn handle_focus (&mut self, event: &FocusEvent) -> Usually<bool> {
        Ok(match event {
            FocusEvent::Backward => {
                if self.focus == 0 {
                    self.focus = self.items.len();
                }
                self.focus = self.focus - 1;
                true
            },
            FocusEvent::Forward => {
                self.focus = self.focus + 1;
                if self.focus >= self.items.len() {
                    self.focus = 0;
                }
                true
            },
            FocusEvent::Inward => {
                self.focused = true;
                self.items[self.focus].handle(&AppEvent::Focus)?;
                true
            },
            FocusEvent::Outward => {
                if self.focused {
                    self.focused = false;
                    self.items[self.focus].handle(&AppEvent::Blur)?;
                    true
                } else {
                    false
                }
            },
        })
    }
}

pub fn handle (state: &mut Chain, event: &AppEvent) -> Usually<bool> {
    handle_focus(state, event, keymap!(Chain {
        [Up,    NONE, "focus_up",   "focus row above",
            |s: &mut Chain|s.handle_focus(&FocusEvent::Backward)],
        [Down,  NONE, "focus_down", "focus row below",
            |s: &mut Chain|s.handle_focus(&FocusEvent::Forward)],
        [Enter, NONE, "focus_down", "focus row below",
            |s: &mut Chain|s.handle_focus(&FocusEvent::Inward)],
        [Esc,   NONE, "focus_down", "focus row below",
            |s: &mut Chain|s.handle_focus(&FocusEvent::Outward)]
    }))
}