use crate::*;

/// A LV2 plugin.
#[derive(Debug)]
pub struct LV2Plugin {
    pub world:        livi::World,
    pub instance:     livi::Instance,
    pub plugin:       livi::Plugin,
    pub features:     Arc<livi::Features>,
    pub port_list:    Vec<livi::Port>,
    pub input_buffer: Vec<livi::event::LV2AtomSequence>,
    pub ui_thread:    Option<JoinHandle<()>>,
}

impl LV2Plugin {
    const INPUT_BUFFER: usize = 1024;
    pub fn new (uri: &str) -> Usually<Self> {
        let world = livi::World::with_load_bundle(&uri);
        let features = world
            .build_features(livi::FeaturesBuilder {
                min_block_length: 1,
                max_block_length: 65536,
            });
        let plugin = world
            .iter_plugins()
            .nth(0)
            .expect(&format!("plugin not found: {uri}"));
        Ok(Self {
            instance: unsafe {
                plugin
                    .instantiate(features.clone(), 48000.0)
                    .expect(&format!("instantiate failed: {uri}"))
            },
            port_list: plugin.ports().collect::<Vec<_>>(),
            input_buffer: Vec::with_capacity(Self::INPUT_BUFFER),
            ui_thread: None,
            world,
            features,
            plugin,
        })
    }
}

impl LV2Plugin {
    pub fn from_edn <'e> (jack: &Arc<RwLock<JackClient>>, args: &[Edn<'e>]) -> Usually<Plugin> {
        let mut name = String::new();
        let mut path = String::new();
        edn!(edn in args {
            Edn::Map(map) => {
                if let Some(Edn::Str(n)) = map.get(&Edn::Key(":name")) {
                    name = String::from(*n);
                }
                if let Some(Edn::Str(p)) = map.get(&Edn::Key(":path")) {
                    path = String::from(*p);
                }
            },
            _ => panic!("unexpected in lv2 '{name}'"),
        });
        Plugin::new_lv2(jack, &name, &path)
    }
}