pub use anyhow::Result;
use client::Clerk;
use parking_lot::Mutex;
use ruaft::rpcs::register_server;
use ruaft::RpcClient;
use server::KVServer;
use std::sync::Arc;
use testing_utils::memory_persister::MemoryStorage;
use testing_utils::rpcs::register_kv_server;

struct ConfigState {
    kv_servers: Vec<Option<Arc<KVServer>>>,
    clerks: Vec<Option<Clerk>>,
}

pub struct Config {
    network: Arc<Mutex<labrpc::Network>>,
    server_count: usize,
    state: Mutex<ConfigState>,
    storage: MemoryStorage,
    maxraftstate: usize,
}

impl Config {
    fn kv_server_name(i: usize) -> String {
        format!("kv-server-{}", i)
    }

    fn server_name(i: usize) -> String {
        format!("kvraft-server-{}", i)
    }

    fn client_name(client: usize, server: usize) -> String {
        format!("kvraft-client-{}-to-{}", client, server)
    }

    fn start_server(&self, index: usize) -> Result<()> {
        let mut clients = vec![];
        {
            let mut network = self.network.lock();
            for j in 0..self.server_count {
                clients.push(RpcClient::new(network.make_client(
                    Self::client_name(index, j),
                    Self::server_name(j),
                )))
            }
        }

        let persister = self.storage.at(index);

        let kv = KVServer::new(clients, index, persister);
        self.state.lock().kv_servers[index].replace(kv.clone());

        let raft = std::rc::Rc::new(kv.raft());

        register_server(raft, Self::server_name(index), self.network.as_ref())?;

        register_kv_server(
            kv,
            Self::kv_server_name(index),
            self.network.as_ref(),
        )?;
        Ok(())
    }
}

pub fn make_config(
    server_count: usize,
    unreliable: bool,
    maxraftstate: usize,
) -> Config {
    let network = labrpc::Network::run_daemon();
    {
        let mut unlocked_network = network.lock();
        unlocked_network.set_reliable(!unreliable);
        unlocked_network.set_long_delays(true);
    }

    let state = Mutex::new(ConfigState {
        kv_servers: vec![None; server_count],
        clerks: vec![],
    });

    let mut storage = MemoryStorage::default();
    for _ in 0..server_count {
        storage.make();
    }

    let cfg = Config {
        network,
        server_count,
        state,
        storage,
        maxraftstate,
    };

    for i in 0..server_count {
        cfg.start_server(i)
            .expect("Starting server should not fail");
    }

    cfg
}