use std::sync::{Arc, RwLock};
use tek::*;
#[allow(unused_imports)] use clap::{self, Parser, Subcommand, ValueEnum};

#[derive(Debug, Parser)]
#[command(version, about, long_about = None)]
pub struct TekCli {
    /// Which app to initialize
    #[command(subcommand)] mode: TekMode,
    /// 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>,
}

#[derive(Debug, Clone, Subcommand)]
pub enum TekMode {
    /// A standalone transport clock.
    Clock,
    /// A MIDI sequencer.
    Sequencer,
    /// A MIDI-controlled audio sampler.
    Sampler,
    /// Sequencer and sampler together.12
    Groovebox,
    /// Multi-track MIDI sequencer.
    Arranger {
        /// Number of scenes
        #[arg(short = 'y', long, default_value_t = 1)] scenes:      usize,
        /// Number of tracks
        #[arg(short = 'x', long, default_value_t = 1)] tracks:      usize,
        /// Width of tracks
        #[arg(short = 'w', long, default_value_t = 9)] track_width: usize,
    },
    /// TODO: A MIDI-controlled audio mixer
    Mixer,
    /// TODO: A customizable channel strip
    Track,
    /// TODO: An audio plugin host
    Plugin,
}

/// Application entrypoint.
pub fn main () -> Usually<()> {
    let cli         = TekCli::parse();
    let name        = cli.name.as_ref().map_or("tek", |x|x.as_str());
    let color       = ItemPalette::random();
    let jack        = JackConnection::new(name)?;
    let engine      = Tui::new()?;
    let empty       = &[] as &[&str];
    let midi_froms  = PortConnection::collect(&cli.midi_from,  &cli.midi_from_re, empty);
    let midi_tos    = PortConnection::collect(&cli.midi_to,    &cli.midi_to_re,   empty);
    let left_froms  = PortConnection::collect(&cli.left_from,  empty, empty);
    let left_tos    = PortConnection::collect(&cli.left_to,    empty, empty);
    let right_froms = PortConnection::collect(&cli.right_from, empty, empty);
    let right_tos   = PortConnection::collect(&cli.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 default_clip = ||Arc::new(RwLock::new(MidiClip::new(
        "Clip", true, 384usize, None, Some(ItemColor::random().into()))));
    let default_player = |jack: &Arc<RwLock<JackConnection>>, clip: Option<&Arc<RwLock<MidiClip>>>|
        MidiPlayer::new(&jack, name, clip, &midi_froms, &midi_tos);
    let default_sampler = |jack: &Arc<RwLock<JackConnection>>|
        Sampler::new(jack, &"sampler", &midi_froms,
            &[&left_froms, &right_froms], &[&left_tos, &right_tos]);
    let default_bpm = |clock: Clock|{
        if let Some(bpm) = cli.bpm {
            clock.timebase.bpm.set(bpm);
        }
        clock
    };
    let default_clock = |jack: &Arc<RwLock<JackConnection>>|default_bpm(Clock::from(jack));
    // TODO: enable sync master/follow
    //let sync_clock = |jack: &Arc<RwLock<JackConnection>>, app|{
        //if cli.sync_lead {
            //jack.read().unwrap().client().register_timebase_callback(false, |mut state|{
                //app.clock().playhead.update_from_sample(state.position.frame() as f64);
                //state.position.bbt = Some(app.clock().bbt());
                //state.position
            //})
        //} else if cli.sync_follow {
            //jack.read().unwrap().client().register_timebase_callback(false, |state|{
                //app.clock().playhead.update_from_sample(state.position.frame() as f64);
                //state.position
            //})
        //} else {
            //Ok(())
        //}
    //};
    Ok(match cli.mode {
        TekMode::Clock => engine.run(&jack.activate_with(|jack|Ok(ClockTui {
            jack: jack.clone(), clock: default_clock(jack),
        }))?)?,
        TekMode::Sampler => engine.run(&jack.activate_with(|jack|Ok(
            SamplerTui {
                cursor: (0, 0),
                editing: None,
                mode: None,
                note_lo: 36.into(),
                note_pt: 36.into(),
                state: default_sampler(jack)?,
                color,
                size: Measure::new(),
            }
        ))?)?,
        TekMode::Sequencer => engine.run(&jack.activate_with(|jack|Ok({
            let clip = default_clip();
            let mut player = default_player(jack, Some(&clip))?;
            player.clock = default_bpm(player.clock);
            App::sequencer(
                jack, (&clip).into(), (&clip).into(),
                Some(player), &midi_froms, &midi_tos, 
            )
        }))?)?,
        TekMode::Groovebox => engine.run(&jack.activate_with(|jack|Ok({
            let clip = default_clip();
            let mut player = default_player(jack, Some(&clip))?;
            player.clock = default_bpm(player.clock);
            let sampler = default_sampler(jack)?;
            jack.connect_ports(&player.midi_outs[0].port, &sampler.midi_in.as_ref().unwrap().port)?;
            App::groovebox(
                jack, (&clip).into(), (&clip).into(),
                Some(player), &midi_froms, &midi_tos, 
                sampler, audio_froms, audio_tos,
            )
        }))?)?,
        TekMode::Arranger { scenes, tracks, track_width, .. } => engine.run(&jack.activate_with(|jack|Ok({
            App::arranger(
                jack,
                PoolModel::default(),
                MidiEditor::default(),  &midi_froms, &midi_tos,
                default_sampler(jack)?, audio_froms, audio_tos,
                scenes, tracks, track_width
            )
        }))?)?,


                //let clock = default_clock(jack);
                //let mut app = Arranger {
                    //jack:      jack.clone(),
                    //midi_ins:  vec![JackPort::<MidiIn>::new(jack,  format!("M/{name}"), &midi_froms)?,],
                    //midi_outs: vec![JackPort::<MidiOut>::new(jack, format!("{name}/M"), &midi_tos)?,  ],
                    //clock,
                    //pool:      PoolModel::default(),//(&clip).into(),
                    //editor:    MidiEditor::default(),//(&clip).into(),
                    //selected:  ArrangerSelection::Clip(0, 0),
                    //scenes:    vec![],
                    //tracks:    vec![],
                    //splits:    [12, 20],
                    //midi_buf:  vec![vec![];65536],
                    //note_buf:  vec![],
                    //compact:   false,
                    //editing:   true.into(),
                    //color,
                    //perf,
                    //size,
                //};
                //app.tracks_add(tracks, track_width, &midi_froms, &midi_tos)?;
                //app.scenes_add(scenes)?;
                //app
            //}))?)?,

        _ => todo!()
    })
}

#[test] fn verify_cli () {
    use clap::CommandFactory;
    TekCli::command().debug_assert();
}