//! Project file format.
//!
//! This module `impl`s the `from_edn`, `load_edn`, etc. methods
//! of structs that are defined in other modules. See:
//!
//! * [App::from_edn]
//! * [App::load_edn]
//! * [App::load_edn_one]
//! * [Scene::load_edn]
//! * [Track::load_edn]
//! * [Phrase::load_edn]
//! * [Sampler::load_edn]
//! * [Sample::load_edn]
//! * [LV2Plugin::load_edn]

use crate::*;

impl App {

    pub fn from_edn (src: &str) -> Usually<Self> {
        let mut app = Self::new()?;
        app.load_edn(src)?;
        Ok(app)
    }

    pub fn load_edn (&mut self, mut src: &str) -> Usually<&mut Self> {
        loop {
            match read(src) {
                Ok((edn, rest)) => {
                    self.load_edn_one(edn)?;
                    if rest.len() > 0 {
                        src = rest;
                    } else {
                        break
                    }
                },
                Err(EdnError { ptr: None, .. }) => {
                    break
                },
                Err(e) => {
                    panic!("{e:?}");
                },
            }
        }
        Ok(self)
    }

    fn load_edn_one <'e> (&mut self, edn: Edn<'e>) -> Usually<()> {
        match edn {
            Edn::List(items) => {
                match items.get(0) {
                    Some(Edn::Symbol("bpm")) => {
                        match items.get(1) {
                            Some(Edn::Int(b)) =>
                                self.transport.timebase.set_bpm(*b as f64),
                            Some(Edn::Double(b)) =>
                                self.transport.timebase.set_bpm(f64::from(*b)),
                            _ => panic!("unspecified bpm")
                        }
                    },
                    Some(Edn::Symbol("scene")) => {
                        tek_sequencer::Scene::from_edn(&items[1..])?;
                    },
                    Some(Edn::Symbol("track")) => {
                        tek_mixer::Track::from_edn(&items[1..])?;
                    },
                    Some(Edn::Symbol("midi-in")) => {
                        self.midi_ins = items[1..].iter().map(|x|match x {
                            Edn::Str(n) => n.to_string(),
                            _ => panic!("unexpected midi-in")
                        }).collect::<Vec<_>>();
                    },
                    Some(Edn::Symbol("audio-out")) => {
                        let client = self.client();
                        self.audio_outs = items[1..].iter().map(|x|match x {
                            Edn::Str(n) => n.to_string(),
                            _ => panic!("unexpected midi-in")
                        }).collect::<Vec<_>>()
                            .iter()
                            .map(|name|client
                                .ports(Some(name), None, PortFlags::empty())
                                .get(0)
                                .map(|name|client.port_by_name(name)))
                            .flatten()
                            .filter_map(|x|x)
                            .map(Arc::new)
                            .collect();
                    },
                    _ => panic!("unexpected edn: {:?}", items.get(0))
                }
            },
            _ => {
                panic!("unexpected edn: {edn:?}");
            }
        }
        Ok(())
    }

}