use crate::{*, arrange::*, clock::*, config::*, device::*};

/// The command-line interface descriptor.
///
/// ```
/// let cli: tek::Cli = Default::default();
///
/// use clap::CommandFactory;
/// tek::Cli::command().debug_assert();
/// ```
#[derive(Parser)]
#[command(name = "tek", version, about = Some(HEADER), long_about = Some(HEADER))]
#[derive(Debug, Default)] pub struct Cli {
    /// Pre-defined configuration modes.
    ///
    /// TODO: Replace these with scripted configurations.
    #[command(subcommand)] pub action: Action,
}

/// Application modes that can be passed to the mommand line interface.
///
/// ```
/// let action: tek::Action = Default::default();
/// ```
#[derive(Debug, Clone, Subcommand, Default)] pub enum Action {
    /// Continue where you left off
    #[default] Resume,
    /// Run headlessly in current session.
    Headless,
    /// Show status of current session.
    Status,
    /// List known sessions.
    List,
    /// Continue work in a copy of the current session.
    Fork,
    /// Create a new empty session.
    New {
        /// Name of JACK client
        #[arg(short='n', long)] name: Option<String>,
        /// Whether to attempt to become transport master
        #[arg(short='Y', long, default_value_t = false)] sync_lead: bool,
       /// Whether to sync to external transport master
        #[arg(short='y', 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='c', 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>,
        /// Tracks to create
        #[arg(short='t', long)] tracks: Option<usize>,
        /// Scenes to create
        #[arg(short='s', long)] scenes: Option<usize>,
    },
    /// Import media as new session.
    Import,
    /// Show configuration.
    Config,
    /// Show version.
    Version,
}

/// Command-line configuration.
#[cfg(feature = "cli")] impl Cli {
    pub fn run (&self) -> Usually<()> {
        if let Action::Version = self.action {
            return Ok(tek_show_version())
        }

        let mut config = Config::new(None);
        config.init()?;

        if let Action::Config = self.action {
            tek_print_config(&config);
        } else if let Action::List = self.action {
            todo!("list sessions")
        } else if let Action::Resume = self.action {
            todo!("resume session")
        } else if let Action::New {
            name, bpm, tracks, scenes, sync_lead, sync_follow,
            midi_from, midi_from_re, midi_to, midi_to_re,
            left_from, right_from, left_to, right_to, ..
        } = &self.action {

            // Connect to JACK
            let name = name.as_ref().map_or("tek", |x|x.as_str());
            let jack = Jack::new(&name)?;

            // TODO: Collect audio IO:
            let empty        = &[] as &[&str];
            let left_froms   = Connect::collect(&left_from,  empty, empty);
            let left_tos     = Connect::collect(&left_to,    empty, empty);
            let right_froms  = Connect::collect(&right_from, empty, empty);
            let right_tos    = Connect::collect(&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()];

            // Create initial project:
            let clock = Clock::new(&jack, *bpm)?;
            let mut project = Arrangement::new(
                &jack,
                None,
                clock,
                vec![],
                vec![],
                Connect::collect(&midi_from, &[] as &[&str], &midi_from_re).iter().enumerate()
                    .map(|(index, connect)|jack.midi_in(&format!("M/{index}"), &[connect.clone()]))
                    .collect::<Result<Vec<_>, _>>()?,
                Connect::collect(&midi_to, &[] as &[&str], &midi_to_re).iter().enumerate()
                    .map(|(index, connect)|jack.midi_out(&format!("{index}/M"), &[connect.clone()]))
                    .collect::<Result<Vec<_>, _>>()?
            );
            project.tracks_add(tracks.unwrap_or(0), None, &[], &[])?;
            project.scenes_add(scenes.unwrap_or(0))?;

            if matches!(self.action, Action::Status) {
                // Show status and exit
                tek_print_status(&project);
                return Ok(())
            }

            // Initialize the app state
            let app = tek(&jack, project, config, ":menu");
            if matches!(self.action, Action::Headless) {
                // TODO: Headless mode (daemon + client over IPC, then over network...)
                println!("todo headless");
                return Ok(())
            }

            // Run the [Tui] and [Jack] threads with the [App] state.
            Tui::new(Box::new(std::io::stdout()))?.run(true, &jack.run(move|jack|{

                // Between jack init and app's first cycle:

                jack.sync_lead(*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(*sync_follow)?;

                // FIXME: They don't work properly.

                Ok(app)

            })?)?;
        }
        Ok(())
    }
}

pub fn tek_show_version () {
    println!("todo version");
}

pub fn tek_print_config (config: &Config) {
    use ::ansi_term::Color::*;
    println!("{:?}", config.dirs);
    for (k, v) in config.views.read().unwrap().iter() {
        println!("{} {} {v}", Green.paint("VIEW"), Green.bold().paint(format!("{k:<16}")));
    }
    for (k, v) in config.binds.read().unwrap().iter() {
        println!("{} {}", Green.paint("BIND"), Green.bold().paint(format!("{k:<16}")));
        for (k, v) in v.0.iter() {
            print!("{} ", &Yellow.paint(match &k.0 {
                Event::Key(KeyEvent { modifiers, .. }) =>
                    format!("{:>16}", format!("{modifiers}")),
                _ => unimplemented!()
            }));
            print!("{}", &Yellow.bold().paint(match &k.0 {
                Event::Key(KeyEvent { code, .. }) =>
                    format!("{:<10}", format!("{code}")),
                _ => unimplemented!()
            }));
            for v in v.iter() {
                print!(" => {:?}", v.commands);
                print!(" {}", v.condition.as_ref().map(|x|format!("{x:?}")).unwrap_or_default());
                println!(" {}", v.description.as_ref().map(|x|x.as_ref()).unwrap_or_default());
                //println!(" {:?}", v.source);
            }
        }
    }
    for (k, v) in config.modes.read().unwrap().iter() {
        println!();
        for v in v.name.iter() { print!("{}", Green.bold().paint(format!("{v} "))); }
        for v in v.info.iter() { print!("\n{}", Green.paint(format!("{v}"))); }
        print!("\n{} {}", Blue.paint("TOOL"), Green.bold().paint(format!("{k:<16}")));
        print!("\n{}", Blue.paint("KEYS"));
        for v in v.keys.iter() { print!("{}", Green.paint(format!(" {v}"))); }
        println!();
        for (k, v) in v.modes.read().unwrap().iter() {
            print!("{} {} {:?}",
                Blue.paint("MODE"),
                Green.bold().paint(format!("{k:<16}")),
                v.name);
            print!(" INFO={:?}",
                v.info);
            print!(" VIEW={:?}",
                v.view);
            println!(" KEYS={:?}",
                v.keys);
        }
        print!("{}", Blue.paint("VIEW"));
        for v in v.view.iter() { print!("{}", Green.paint(format!(" {v}"))); }
        println!();
    }
}

pub fn tek_print_status (project: &Arrangement) {
    println!("Name:        {:?}",   &project.name);
    println!("JACK:        {:?}",   &project.jack);
    println!("Buffer:      {:?}",   &project.clock.chunk);
    println!("Sample rate: {:?}",   &project.clock.timebase.sr);
    println!("MIDI PPQ:    {:?}",   &project.clock.timebase.ppq);
    println!("Tempo:       {:?}",   &project.clock.timebase.bpm);
    println!("Quantize:    {:?}",   &project.clock.quant);
    println!("Launch:      {:?}",   &project.clock.sync);
    println!("Playhead:    {:?}us", &project.clock.playhead.usec);
    println!("Playhead:    {:?}s",  &project.clock.playhead.sample);
    println!("Playhead:    {:?}p",  &project.clock.playhead.pulse);
    println!("Started:     {:?}",   &project.clock.started);
    println!("Tracks:");
    for (i, t) in project.tracks.iter().enumerate() {
        println!("  Track {i}:   {} {} {:?} {:?}", t.name, t.width,
            &t.sequencer.play_clip, &t.sequencer.next_clip);
    }
    println!("Scenes:");
    for (i, t) in project.scenes.iter().enumerate() {
        println!("  Scene {i}:   {} {:?}", &t.name, &t.clips);
    }
    println!("MIDI Ins:    {:?}",   &project.midi_ins);
    println!("MIDI Outs:   {:?}",   &project.midi_outs);
    println!("Audio Ins:   {:?}",   &project.audio_ins);
    println!("Audio Outs:  {:?}",   &project.audio_outs);
    // TODO git integration
    // TODO dawvert integration
}