pub(crate) use tek::*;
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: Option<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 {
    /// Create a new session instead of loading the previous one.
    New,
}

impl Cli {
    pub fn run (&self) -> Usually<()> {
        let name         = self.name.as_ref().map_or("tek", |x|x.as_str());
        let tracks       = vec![];
        let scenes       = vec![];
        let empty        = &[] as &[&str];
        let left_froms   = Connect::collect(&self.left_from,  empty, empty);
        let left_tos     = Connect::collect(&self.left_to,    empty, empty);
        let right_froms  = Connect::collect(&self.right_from, empty, empty);
        let right_tos    = Connect::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 mut config = Config::new(None);
        config.init()?;
        Tui::new()?.run(&Jack::new_run(&name, move|jack|{
            let app = App {
                jack:    jack.clone(),
                color:   ItemTheme::random(),
                dialog:  Dialog::welcome(),
                mode:    config.modes.clone().read().unwrap().get(":menu").cloned().unwrap(),
                config,
                project: Arrangement {
                    name:  Default::default(),
                    color: ItemTheme::random(),
                    jack:  jack.clone(),
                    clock: Clock::new(&jack, self.bpm)?,
                    tracks,
                    scenes,
                    selection: Selection::TrackClip { track: 0, scene: 0 },
                    midi_ins: {
                        let mut midi_ins  = vec![];
                        for (index, connect) in self.midi_froms().iter().enumerate() {
                            midi_ins.push(jack.midi_in(&format!("M/{index}"), &[connect.clone()])?);
                        }
                        midi_ins
                    },
                    midi_outs: {
                        let mut midi_outs = vec![];
                        for (index, connect) in self.midi_tos().iter().enumerate() {
                            midi_outs.push(jack.midi_out(&format!("{index}/M"), &[connect.clone()])?);
                        };
                        midi_outs
                    },
                    ..Default::default()
                },
                ..Default::default()
            };
            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)
        })?)
    }
    fn midi_froms (&self) -> Vec<Connect> {
        Connect::collect(&self.midi_from, &[] as &[&str], &self.midi_from_re)
    }
    fn midi_tos (&self) -> Vec<Connect> {
        Connect::collect(&self.midi_to, &[] as &[&str], &self.midi_to_re)
    }
}

/// CLI header
const HEADER: &'static str = r#"
~ ╓─╥─╖ ╓──╖ ╥  ╖ ~~~~  ~  ~ ~~  ~  ~  ~ ~~ ~ ~  ~  ~ ~~~~~~ ~ ~~~
 ~~ ║ ~ ╟─╌ ~╟─< ~ v0.3.0, 2025 sum(m)er @ the nose of the cat. ~
~~~ ╨ ~ ╙──╜ ╨  ╜  ~  ~~~  ~ ~  ~   ~ ~~~ ~~~ ~   ~~  ~~  ~~  ~ ~~
  On first run, Tek will create configuration and state dirs:
  * [x] ~/.config/tek      - config
  * [ ] ~/.local/share/tek - projects
  * [ ] ~/.local/lib/tek   - plugins
  * [ ] ~/.cache/tek       - cache
~"#;

#[cfg(test)] #[test] fn test_cli () {
    use clap::CommandFactory;
    Cli::command().debug_assert();
    //let jack = Jack::default();
}