//! `ru.shturman.Settings1` — server-стаб. Хранит строки (v0); namespace-изоляция по `sender` — позже (v3).

use crate::store::Store;
use shturman_ipc::Error;
use std::sync::Arc;
use tokio::sync::Mutex;
use zbus::interface;
use zbus::object_server::SignalContext;
use zbus::zvariant::{OwnedValue, Value};

pub struct SettingsService {
    store: Arc<Mutex<Store>>,
}

impl SettingsService {
    pub fn new(store: Store) -> Self {
        Self {
            store: Arc::new(Mutex::new(store)),
        }
    }
}

#[interface(name = "ru.shturman.Settings1")]
impl SettingsService {
    async fn get(&self, key: &str) -> Result<OwnedValue, Error> {
        let store = self.store.lock().await;
        match store.get(key) {
            Some(v) => OwnedValue::try_from(Value::from(v.to_string()))
                .map_err(|e| Error::InvalidArgument(format!("value convert: {e}"))),
            None => Err(Error::InvalidArgument(format!("unknown key: {key}"))),
        }
    }

    async fn set(
        &self,
        key: String,
        value: Value<'_>,
        #[zbus(signal_context)] ctx: SignalContext<'_>,
    ) -> Result<(), Error> {
        let s = match value {
            Value::Str(s) => s.as_str().to_string(),
            _ => {
                return Err(Error::InvalidArgument(
                    "v0 поддерживает только строковые значения".into(),
                ))
            }
        };
        self.store
            .lock()
            .await
            .set(&key, &s)
            .map_err(|e| Error::InvalidArgument(format!("persist: {e}")))?;
        let _ = Self::changed(&ctx, &key, &Value::from(s)).await;
        Ok(())
    }

    async fn list(&self, prefix: &str) -> Vec<String> {
        self.store.lock().await.list(prefix)
    }

    async fn reset(
        &self,
        key: String,
        #[zbus(signal_context)] ctx: SignalContext<'_>,
    ) -> Result<(), Error> {
        let new = self
            .store
            .lock()
            .await
            .reset(&key)
            .map_err(|e| Error::InvalidArgument(format!("persist: {e}")))?;
        let _ = Self::changed(&ctx, &key, &Value::from(new.unwrap_or_default())).await;
        Ok(())
    }

    #[zbus(signal)]
    async fn changed(ctx: &SignalContext<'_>, key: &str, value: &Value<'_>) -> zbus::Result<()>;
}