/*
 * mCaptcha - A proof of work based DoS protection system
 * Copyright © 2023 Aravinth Manivannan <realravinth@batsense.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#![allow(clippy::uninlined_format_args)]

use std::io::Cursor;
use std::sync::Arc;

use actix_web::middleware;
use actix_web::middleware::Logger;
use actix_web::web::Data;
use actix_web::App;
use actix_web::HttpServer;
use openraft::storage::Adaptor;
use openraft::BasicNode;
use openraft::Config;
use openraft::Raft;

use crate::app::DcacheApp;
use crate::network::api;
use crate::network::management;
use crate::network::raft;
use crate::network::raft_network_impl::DcacheNetwork;
use crate::store::DcacheRequest;
use crate::store::DcacheResponse;
use crate::store::DcacheStore;

pub mod app;
pub mod network;
pub mod store;

pub type DcacheNodeId = u64;

openraft::declare_raft_types!(
    /// Declare the type configuration for example K/V store.
    pub DcacheTypeConfig: D = DcacheRequest, R = DcacheResponse, NodeId = DcacheNodeId, Node = BasicNode,
    Entry = openraft::Entry<DcacheTypeConfig>, SnapshotData = Cursor<Vec<u8>>
);

pub type LogStore = Adaptor<DcacheTypeConfig, Arc<DcacheStore>>;
pub type StateMachineStore = Adaptor<DcacheTypeConfig, Arc<DcacheStore>>;
pub type DcacheRaft = Raft<DcacheTypeConfig, Arc<DcacheNetwork>, LogStore, StateMachineStore>;

pub mod typ {
    use openraft::BasicNode;

    use crate::DcacheNodeId;
    use crate::DcacheTypeConfig;

    pub type RaftError<E = openraft::error::Infallible> =
        openraft::error::RaftError<DcacheNodeId, E>;
    pub type RPCError<E = openraft::error::Infallible> =
        openraft::error::RPCError<DcacheNodeId, BasicNode, RaftError<E>>;

    pub type ClientWriteError = openraft::error::ClientWriteError<DcacheNodeId, BasicNode>;
    pub type CheckIsLeaderError = openraft::error::CheckIsLeaderError<DcacheNodeId, BasicNode>;
    pub type ForwardToLeader = openraft::error::ForwardToLeader<DcacheNodeId, BasicNode>;
    pub type InitializeError = openraft::error::InitializeError<DcacheNodeId, BasicNode>;

    pub type ClientWriteResponse = openraft::raft::ClientWriteResponse<DcacheTypeConfig>;
}

pub async fn start_example_raft_node(
    node_id: DcacheNodeId,
    http_addr: String,
    introducer_addr: String,
    introducer_id: DcacheNodeId,
) -> std::io::Result<()> {
    // Create a configuration for the raft instance.
    let config = Config {
        heartbeat_interval: 500,
        election_timeout_min: 1500,
        election_timeout_max: 3000,
        ..Default::default()
    };

    let salt = "foobar12".into();
    #[cfg(release)]
    todo!("set salt");

    let config = Arc::new(config.validate().unwrap());

    // Create a instance of where the Raft data will be stored.
    let store = Arc::new(DcacheStore::new(salt));

    let (log_store, state_machine) = Adaptor::new(store.clone());
    let client = reqwest::Client::new();

    // Create the network layer that will connect and communicate the raft instances and
    // will be used in conjunction with the store created above.

    let (manager_tx, manager_rx) = tokio::sync::mpsc::channel(1000);
    // let health = Arc::new(crate::network::raft_network_impl::HealthLedger::new(manager_tx));
    // let network = Arc::new(DcacheNetwork::new(health));
    let network = Arc::new(DcacheNetwork::new(manager_tx, client.clone()));

    // Create a local raft instance.
    let raft = Raft::new(
        node_id,
        config.clone(),
        network.clone(),
        log_store,
        state_machine,
    )
    .await
    .unwrap();
    raft.enable_heartbeat(true);
    raft.enable_elect(true);
    //    raft.enable_tick(true);

    // Create an application that will store all the instances created above, this will
    // be later used on the actix-web services.
    let app = Data::new(DcacheApp {
        id: node_id,
        addr: http_addr.clone(),
        raft,
        store,
        config,
        network,
    });

    if introducer_addr == http_addr {
        app.init().await.unwrap();
    }

    let app_copy = app.clone();
    // Start the actix-web server.
    let server = HttpServer::new(move || {
        App::new()
            .wrap(Logger::default())
            .wrap(Logger::new("%a %{User-Agent}i"))
            .wrap(middleware::Compress::default())
            .app_data(app.clone())
            // raft internal RPC
            .service(raft::append)
            .service(raft::snapshot)
            .service(raft::vote)
            // admin API
            .service(management::init)
            .service(management::add_learner)
            .service(management::change_membership)
            .service(management::metrics)
            // application API
            .service(api::write)
            .service(api::state)
            .service(api::read)
            .service(api::pipeline_read)
            .service(api::pipeline_write)
        //            .service(api::consistent_read)
    });

    let x = server.bind(&http_addr)?;

    let server_fut = tokio::spawn(x.run());
    tokio::time::sleep(std::time::Duration::new(3, 0)).await;

    let req: (DcacheNodeId, String) = (node_id, http_addr);
    let c = reqwest::Client::new();
    c.post(format!("http://{}/add-learner", introducer_addr))
        .json(&req)
        .send()
        .await
        .unwrap();
    //    let health_job = tokio::spawn(DcacheApp::health_job(app_copy));

    let health_metrics_handle =
        crate::network::management::HealthMetrics::spawn(app_copy, 5, manager_rx).await;
    server_fut.await??;
    health_metrics_handle.abort();
    //   health_job.abort();
    Ok(())
}