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use crate::{database::Database, handler::StorageHandler, objects::Objects};
use anyhow::Result;
use futures::{future, prelude::*};
use openvet_common::storage::Storage;
use std::{net::SocketAddr, path::Path};
use tarpc::{
    server::{self, incoming::Incoming, Channel},
    tokio_serde::formats::Json,
};
use tracing::*;

#[derive(Clone, Debug)]
pub struct StorageService {
    database: Database,
    objects: Objects,
}

async fn spawn(fut: impl Future<Output = ()> + Send + 'static) {
    tokio::spawn(fut);
}

impl StorageService {
    pub async fn new(path: &Path) -> Result<Self> {
        let database = Database::open(path).await?;
        let objects = Objects::memory().await?;
        Ok(Self { database, objects })
    }

    pub async fn memory() -> Result<Self> {
        let database = Database::memory().await?;
        let objects = Objects::memory().await?;
        Ok(Self { database, objects })
    }

    pub async fn listen(&self, socket: SocketAddr) -> Result<()> {
        let mut listener = tarpc::serde_transport::tcp::listen(&socket, Json::default).await?;
        info!("Listening on {}", listener.local_addr());
        listener.config_mut().max_frame_length(usize::MAX);
        let handler = StorageHandler::new(self.clone());
        listener
            .filter_map(|r| future::ready(r.ok()))
            .map(server::BaseChannel::with_defaults)
            .max_channels_per_key(4, |t| t.transport().peer_addr().unwrap().ip())
            .map(|channel| channel.execute(handler.clone().serve()).for_each(spawn))
            .buffer_unordered(10)
            .for_each(|_| async {})
            .await;
        Ok(())
    }

    pub fn database(&self) -> &Database {
        &self.database
    }

    pub fn objects(&self) -> &Objects {
        &self.objects
    }
}