pub(crate) use tek::*;
pub(crate) use std::sync::{Arc, RwLock};
pub(crate) use clap::{self, Parser, Subcommand};

/// Application entrypoint.
pub fn main () -> Usually<()> {
    Cli::parse().run()
}

#[derive(Debug, Parser)]
#[command(name = "tek", version, about = Some(HEADER), long_about = Some(HEADER))]
pub struct Cli {
    /// Pre-defined configuration modes.
    ///
    /// TODO: Replace these with scripted configurations.
    #[command(subcommand)] mode: LaunchMode,
    /// Name of JACK client
    #[arg(short='n', long)] name: Option<String>,
    /// Whether to attempt to become transport master
    #[arg(short='S', long, default_value_t = false)] sync_lead: bool,
   /// Whether to sync to external transport master
    #[arg(short='s', long, default_value_t = true)] sync_follow: bool,
    /// Initial tempo in beats per minute
    #[arg(short='b', long, default_value = None)] bpm: Option<f64>,
    /// Whether to include a transport toolbar (default: true)
    #[arg(short='t', long, default_value_t = true)] show_clock: bool,
    /// MIDI outs to connect to (multiple instances accepted)
    #[arg(short='I', long)] midi_from: Vec<String>,
    /// MIDI outs to connect to (multiple instances accepted)
    #[arg(short='i', long)] midi_from_re: Vec<String>,
    /// MIDI ins to connect to (multiple instances accepted)
    #[arg(short='O', long)] midi_to: Vec<String>,
    /// MIDI ins to connect to (multiple instances accepted)
    #[arg(short='o', long)] midi_to_re: Vec<String>,
    /// Audio outs to connect to left input
    #[arg(short='l', long)] left_from: Vec<String>,
    /// Audio outs to connect to right input
    #[arg(short='r', long)] right_from: Vec<String>,
    /// Audio ins to connect from left output
    #[arg(short='L', long)] left_to: Vec<String>,
    /// Audio ins to connect from right output
    #[arg(short='R', long)] right_to: Vec<String>,
}

/// Application modes
#[derive(Debug, Clone, Subcommand)]
pub enum LaunchMode {
    /// ⏯️ A standalone transport clock.
    Clock,
    /// 🎼 A MIDI sequencer.
    Sequencer,
    /// 🎺 A MIDI-controlled audio sampler.
    Sampler,
    /// 📻 Sequencer and sampler together.
    Groovebox,
    /// 🎧 Multi-track MIDI sequencer.
    Arranger {
        /// Number of scenes
        #[arg(short = 'y', long, default_value_t = 4)] scenes: usize,
        /// Number of tracks
        #[arg(short = 'x', long, default_value_t = 4)] tracks: usize,
        /// Width of tracks
        #[arg(short = 'w', long, default_value_t = 12)] track_width: usize,
    },
    /// TODO: A MIDI-controlled audio mixer
    Mixer,
    /// TODO: A customizable channel strip
    Track,
    /// TODO: An audio plugin host
    Plugin,
}

impl Cli {
    pub fn run (&self) -> Usually<()> {
        let name        = self.name.as_ref().map_or("tek", |x|x.as_str());
        let mode        = &self.mode;
        let empty       = &[] as &[&str];
        let midi_froms  = PortConnect::collect(&self.midi_from,  empty, &self.midi_from_re);
        let midi_tos    = PortConnect::collect(&self.midi_to,    empty, &self.midi_to_re);
        let left_froms  = PortConnect::collect(&self.left_from,  empty, empty);
        let left_tos    = PortConnect::collect(&self.left_to,    empty, empty);
        let right_froms = PortConnect::collect(&self.right_from, empty, empty);
        let right_tos   = PortConnect::collect(&self.right_to,   empty, empty);
        let audio_froms = &[left_froms.as_slice(), right_froms.as_slice()];
        let audio_tos   = &[left_tos.as_slice(), right_tos.as_slice()];
        let clip = match mode {
            LaunchMode::Sequencer | LaunchMode::Groovebox => Some(Arc::new(RwLock::new(MidiClip::new(
                "Clip", true, 384usize, None, Some(ItemColor::random().into())),
            ))),
            _ => None,
        };
        let scenes = vec![];
        Tui::new()?.run(&Jack::new(name)?.run(|jack|{
            let mut midi_ins  = vec![];
            let mut midi_outs = vec![];
            for (index, connect) in midi_froms.iter().enumerate() {
                let port = JackMidiIn::new(jack, &format!("M/{index}"), &[connect.clone()])?;
                midi_ins.push(port);
            }
            for (index, connect) in midi_tos.iter().enumerate() {
                let port = JackMidiOut::new(jack, &format!("{index}/M"), &[connect.clone()])?;
                midi_outs.push(port);
            };
            let config_path = match mode {
                LaunchMode::Clock           => "config/config_transport.edn",
                LaunchMode::Sequencer       => "config/config_sequencer.edn",
                LaunchMode::Groovebox       => "config/config_groovebox.edn",
                LaunchMode::Arranger { .. } => "config/config_arranger.edn",
                LaunchMode::Sampler         => "config/config_sampler.edn",
                _ => todo!("{mode:?}"),
            };
            let config = Configuration::new(&config_path, false)?;
            let mut app = Tek {
                jack:  jack.clone(),
                color: ItemTheme::random(),
                clock: Clock::new(jack, self.bpm)?,
                pool: match mode {
                    LaunchMode::Sequencer | LaunchMode::Groovebox => clip.as_ref().map(Into::into),
                    LaunchMode::Arranger { .. } => Some(Default::default()),
                    _ => None,
                },
                editor: match mode {
                    LaunchMode::Sequencer | LaunchMode::Groovebox => clip.as_ref().map(Into::into),
                    LaunchMode::Arranger { .. } => Some(Default::default()),
                    _ => None
                },
                midi_ins,
                midi_outs,
                midi_buf: match mode {
                    LaunchMode::Clock
                        | LaunchMode::Sampler => vec![],
                    LaunchMode::Sequencer
                        | LaunchMode::Groovebox
                        | LaunchMode::Arranger {..} => vec![vec![];65536],
                    _ => todo!("{mode:?}"),
                },
                tracks: match mode {
                    LaunchMode::Sequencer => vec![
                        Track::new_sequencer()
                    ],
                    LaunchMode::Groovebox => vec![
                        Track::new_groovebox(jack, midi_froms.as_slice(), audio_froms, audio_tos)?
                    ],
                    LaunchMode::Sampler => vec![
                        Track::new_sampler(jack, midi_froms.as_slice(), audio_froms, audio_tos)?
                    ],
                    _ => vec![]
                },
                scenes,
                selected: Selection::TrackClip { track: 0, scene: 0 },
                config,
                ..Default::default()
            };
            if let &LaunchMode::Arranger { scenes, tracks, track_width, .. } = mode {
                app.arranger = Default::default();
                app.selected = Selection::TrackClip { track: 1, scene: 1 };
                app.scenes_add(scenes)?;
                app.tracks_add(tracks, Some(track_width), &[], &[])?;
            }
            jack.sync_lead(self.sync_lead, |mut state|{
                let clock = app.clock();
                clock.playhead.update_from_sample(state.position.frame() as f64);
                state.position.bbt = Some(clock.bbt());
                state.position
            })?;
            jack.sync_follow(self.sync_follow)?;
            Ok(app)
        })?)
    }
}

/// CLI header
const HEADER: &'static str = r#"

 ╓─╥─╖ ╓──╖ ╥  ╖
   ║   ╟─╌  ╟─╡
   ╨   ╙──╜ ╨  ╜"#;

#[cfg(test)] #[test] fn test_cli () {
    use clap::CommandFactory;
    Cli::command().debug_assert();
    let jack = Jack::default();
    //TODO:
    //let _ = Tek::new_clock(&jack, None, false, false, &[], &[]);
    //let _ = Tek::new_sequencer(&jack, None, false, false, &[], &[]);
    //let _ = Tek::new_groovebox(&jack, None, false, false, &[], &[], &[&[], &[]], &[&[], &[]]);
    //let _ = Tek::new_arranger(&jack, None, false, false, &[], &[], &[&[], &[]], &[&[], &[]], 0, 0, 0);
}