use crate::core::*;
use crate::model::*;

pub struct Track {
    pub name:       String,
    /// Play input through output.
    pub monitoring: bool,
    /// Write input to sequence.
    pub recording:  bool,
    /// Overdub input to sequence.
    pub overdub:    bool,
    /// Map: tick -> MIDI events at tick
    pub phrases:    Vec<Phrase>,
    /// Phrase selector
    pub sequence:   Option<usize>,
    /// Output from current sequence.
    pub midi_out:   Port<MidiOut>,
    /// Red keys on piano roll.
    pub notes_on:   Vec<bool>,
    /// Device chain
    pub devices:    Vec<Arc<Mutex<Box<dyn Device>>>>,
    /// Device selector
    pub device:     usize,
}

impl Track {
    pub fn new (
        name:    &str,
        jack:    &Client,
        phrases: Option<Vec<Phrase>>,
        devices: Option<Vec<Arc<Mutex<Box<dyn Device>>>>>,
    ) -> Usually<Self> {
        Ok(Self {
            name:       name.to_string(),
            midi_out:   jack.register_port(name, MidiOut)?,
            notes_on:   vec![],
            monitoring: false,
            recording:  false,
            overdub:    true,
            sequence:   None,
            phrases:    phrases.unwrap_or_else(||vec![]),
            devices:    devices.unwrap_or_else(||vec![]),
            device:     0,
        })
    }
    pub fn device (&self, i: usize) -> Option<MutexGuard<Box<dyn Device>>> {
        self.devices.get(i).map(|d|d.lock().unwrap())
    }
    pub fn active_device (&self) -> Option<MutexGuard<Box<dyn Device>>> {
        self.device(self.device)
    }
    pub fn first_device (&self) -> Option<MutexGuard<Box<dyn Device>>> {
        self.device(0)
    }
    pub fn last_device (&self) -> Option<MutexGuard<Box<dyn Device>>> {
        self.device(self.devices.len().saturating_sub(1))
    }
    pub fn phrase (&self) -> Option<&Phrase> {
        if let Some(phrase) = self.sequence {
            return self.phrases.get(phrase)
        } else {
            None
        }
    }
    pub fn phrase_mut (&mut self) -> Option<&mut Phrase> {
        if let Some(phrase) = self.sequence {
            return self.phrases.get_mut(phrase)
        } else {
            None
        }
    }
}

ports!(Track {
    audio: {
        outs: |track|{
            if let Some(device) = track.last_device() {
                device.audio_outs()
            } else {
                Ok(vec![])
            }
        },
    }
    midi: {
        ins: |track|if let Some(device) = track.first_device() {
            device.midi_ins()
        } else {
            Ok(vec![])
        },
        outs: |track|Ok(vec![
            &track.midi_out
        ]),
    }
});