use crate::*;

pub mod lv2; pub(crate) use lv2::*;
pub use self::lv2::LV2Plugin;

/// A plugin device.
#[derive(Debug)]
pub struct Plugin {
    /// JACK client handle (needs to not be dropped for standalone mode to work).
    pub jack:       Arc<RwLock<JackConnection>>,
    pub name:       String,
    pub path:       Option<String>,
    pub plugin:     Option<PluginKind>,
    pub selected:   usize,
    pub mapping:    bool,
    pub midi_ins:   Vec<Port<MidiIn>>,
    pub midi_outs:  Vec<Port<MidiOut>>,
    pub audio_ins:  Vec<Port<AudioIn>>,
    pub audio_outs: Vec<Port<AudioOut>>,
}

/// Supported plugin formats.
#[derive(Default)]
pub enum PluginKind {
    #[default] None,
    LV2(LV2Plugin),
    VST2 { instance: () /*::vst::host::PluginInstance*/ },
    VST3,
}

impl Debug for PluginKind {
    fn fmt (&self, f: &mut Formatter<'_>) -> std::result::Result<(), std::fmt::Error> {
        write!(f, "{}", match self {
            Self::None     => "(none)",
            Self::LV2(_)   => "LV2",
            Self::VST2{..} => "VST2",
            Self::VST3     => "VST3",
        })
    }
}
impl Plugin {
    pub fn new_lv2 (
        jack: &Arc<RwLock<JackConnection>>,
        name: &str,
        path: &str,
    ) -> Usually<Self> {
        Ok(Self {
            jack:       jack.clone(),
            name:       name.into(),
            path:       Some(String::from(path)),
            plugin:     Some(PluginKind::LV2(LV2Plugin::new(path)?)),
            selected:   0,
            mapping:    false,
            midi_ins:   vec![],
            midi_outs:  vec![],
            audio_ins:  vec![],
            audio_outs: vec![],
        })
    }
}

pub struct PluginAudio(Arc<RwLock<Plugin>>);
from!(|model: &Arc<RwLock<Plugin>>| PluginAudio = Self(model.clone()));
audio!(|self: PluginAudio, client, scope|{
    let state = &mut*self.0.write().unwrap();
    match state.plugin.as_mut() {
        Some(PluginKind::LV2(LV2Plugin {
            features,
            ref mut instance,
            ref mut input_buffer,
            ..
        })) => {
            let urid = features.midi_urid();
            input_buffer.clear();
            for port in state.midi_ins.iter() {
                let mut atom = ::livi::event::LV2AtomSequence::new(
                    &features,
                    scope.n_frames() as usize
                );
                for event in port.iter(scope) {
                    match event.bytes.len() {
                        3 => atom.push_midi_event::<3>(
                            event.time as i64,
                            urid,
                            &event.bytes[0..3]
                        ).unwrap(),
                        _ => {}
                    }
                }
                input_buffer.push(atom);
            }
            let mut outputs = vec![];
            for _ in state.midi_outs.iter() {
                outputs.push(::livi::event::LV2AtomSequence::new(
                    features,
                    scope.n_frames() as usize
                ));
            }
            let ports = ::livi::EmptyPortConnections::new()
                .with_atom_sequence_inputs(input_buffer.iter())
                .with_atom_sequence_outputs(outputs.iter_mut())
                .with_audio_inputs(state.audio_ins.iter().map(|o|o.as_slice(scope)))
                .with_audio_outputs(state.audio_outs.iter_mut().map(|o|o.as_mut_slice(scope)));
            unsafe {
                instance.run(scope.n_frames() as usize, ports).unwrap()
            };
        },
        _ => todo!("only lv2 is supported")
    }
    Control::Continue
});

    //fn jack_from_lv2 (name: &str, plugin: &::livi::Plugin) -> Usually<Jack> {
        //let counts = plugin.port_counts();
        //let mut jack = Jack::new(name)?;
        //for i in 0..counts.atom_sequence_inputs {
            //jack = jack.midi_in(&format!("midi-in-{i}"))
        //}
        //for i in 0..counts.atom_sequence_outputs {
            //jack = jack.midi_out(&format!("midi-out-{i}"));
        //}
        //for i in 0..counts.audio_inputs {
            //jack = jack.audio_in(&format!("audio-in-{i}"));
        //}
        //for i in 0..counts.audio_outputs {
            //jack = jack.audio_out(&format!("audio-out-{i}"));
        //}
        //Ok(jack)
    //}

impl Plugin {
    /// Create a plugin host device.
    pub fn new (
        jack: &Arc<RwLock<JackConnection>>,
        name: &str,
    ) -> Usually<Self> {
        Ok(Self {
            //_engine:    Default::default(),
            jack:       jack.clone(),
            name:       name.into(),
            path:       None,
            plugin:     None,
            selected:   0,
            mapping:    false,
            audio_ins:  vec![],
            audio_outs: vec![],
            midi_ins:   vec![],
            midi_outs:  vec![],
            //ports:      JackPorts::default()
        })
    }
}
impl Content<Tui> for Plugin {
    fn render (&self, to: &mut TuiOutput) {
        let area = to.area();
        let [x, y, _, height] = area;
        let mut width = 20u16;
        match &self.plugin {
            Some(PluginKind::LV2(LV2Plugin { port_list, instance, .. })) => {
                let start = self.selected.saturating_sub((height as usize / 2).saturating_sub(1));
                let end   = start + height as usize - 2;
                //draw_box(buf, Rect { x, y, width, height });
                for i in start..end {
                    if let Some(port) = port_list.get(i) {
                        let value = if let Some(value) = instance.control_input(port.index) {
                            value
                        } else {
                            port.default_value
                        };
                        //let label = &format!("C·· M·· {:25} = {value:.03}", port.name);
                        let label = &format!("{:25} = {value:.03}", port.name);
                        width = width.max(label.len() as u16 + 4);
                        let style = if i == self.selected {
                            Some(Style::default().green())
                        } else {
                            None
                        } ;
                        to.blit(&label, x + 2, y + 1 + i as u16 - start as u16, style);
                    } else {
                        break
                    }
                }
            },
            _ => {}
        };
        draw_header(self, to, x, y, width);
    }
}

fn draw_header (state: &Plugin, to: &mut TuiOutput, x: u16, y: u16, w: u16) {
    let style  = Style::default().gray();
    let label1 = format!(" {}", state.name);
    to.blit(&label1, x + 1, y, Some(style.white().bold()));
    if let Some(ref path) = state.path {
        let label2 = format!("{}…", &path[..((w as usize - 10).min(path.len()))]);
        to.blit(&label2, x + 2 + label1.len() as u16, y, Some(style.not_dim()));
    }
    //Ok(Rect { x, y, width: w, height: 1 })
}

handle!(<Tui>|self:Plugin, from|{
    match from.event() {
        key_pat!(KeyCode::Up) => {
            self.selected = self.selected.saturating_sub(1);
            Ok(Some(true))
        },
        key_pat!(KeyCode::Down) => {
            self.selected = (self.selected + 1).min(match &self.plugin {
                Some(PluginKind::LV2(LV2Plugin { port_list, .. })) => port_list.len() - 1,
                _ => unimplemented!()
            });
            Ok(Some(true))
        },
        key_pat!(KeyCode::PageUp) => {
            self.selected = self.selected.saturating_sub(8);
            Ok(Some(true))
        },
        key_pat!(KeyCode::PageDown) => {
            self.selected = (self.selected + 10).min(match &self.plugin {
                Some(PluginKind::LV2(LV2Plugin { port_list, .. })) => port_list.len() - 1,
                _ => unimplemented!()
            });
            Ok(Some(true))
        },
        key_pat!(KeyCode::Char(',')) => {
            match self.plugin.as_mut() {
                Some(PluginKind::LV2(LV2Plugin { port_list, ref mut instance, .. })) => {
                    let index = port_list[self.selected].index;
                    if let Some(value) = instance.control_input(index) {
                        instance.set_control_input(index, value - 0.01);
                    }
                },
                _ => {}
            }
            Ok(Some(true))
        },
        key_pat!(KeyCode::Char('.')) => {
            match self.plugin.as_mut() {
                Some(PluginKind::LV2(LV2Plugin { port_list, ref mut instance, .. })) => {
                    let index = port_list[self.selected].index;
                    if let Some(value) = instance.control_input(index) {
                        instance.set_control_input(index, value + 0.01);
                    }
                },
                _ => {}
            }
            Ok(Some(true))
        },
        key_pat!(KeyCode::Char('g')) => {
            match self.plugin {
                //Some(PluginKind::LV2(ref mut plugin)) => {
                    //plugin.ui_thread = Some(run_lv2_ui(LV2PluginUI::new()?)?);
                //},
                Some(_) => unreachable!(),
                None => {}
            }
            Ok(Some(true))
        },
        _ => Ok(None)
    }
});