use parking_lot::RwLock;

use crate::adapters::{DebugAdapter, DebugAdapterName};
use std::{collections::BTreeMap, sync::Arc};

#[derive(Default)]
struct DapRegistryState {
    adapters: BTreeMap<DebugAdapterName, Arc<dyn DebugAdapter>>,
}

#[derive(Default)]
/// Stores available debug adapters.
pub struct DapRegistry(Arc<RwLock<DapRegistryState>>);

impl DapRegistry {
    pub fn add_adapter(&self, adapter: Arc<dyn DebugAdapter>) {
        let name = adapter.name();
        let _previous_value = self.0.write().adapters.insert(name, adapter);
        debug_assert!(
            _previous_value.is_none(),
            "Attempted to insert a new debug adapter when one is already registered"
        );
    }
    pub fn adapter(&self, name: &str) -> Option<Arc<dyn DebugAdapter>> {
        self.0.read().adapters.get(name).cloned()
    }
    pub fn enumerate_adapters(&self) -> Vec<DebugAdapterName> {
        self.0.read().adapters.keys().cloned().collect()
    }

    #[cfg(any(test, feature = "test-support"))]
    pub fn fake() -> Self {
        use crate::FakeAdapter;

        let register = Self::default();
        register.add_adapter(Arc::new(FakeAdapter::new()));
        register
    }
}