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mod wait_ready;

use anyhow::Error;
use async_trait::async_trait;
use derive_more::From;
use meio::{
    ActionHandler, Actor, Address, Context, IdOf, InstantActionHandler, InterruptedBy, StartedBy,
    TaskEliminated, TaskError,
};
use meio_connect::{
    client::{WsClient, WsClientStatus, WsSender},
    WsIncoming,
};
use rill_protocol::io::client::{
    ClientProtocol, ClientRequest, ClientResponse, ClientServiceRequest, ClientServiceResponse,
};
use rill_protocol::io::transport::ServiceEnvelope;
use std::collections::VecDeque;
use std::time::Duration;

type WsOutgoing = WsSender<ServiceEnvelope<ClientProtocol, ClientRequest, ClientServiceResponse>>;

#[derive(From)]
pub struct RillClientLink {
    address: Address<RillClient>,
}

pub struct RillClient {
    url: String,
    sender: Option<WsOutgoing>,
    awaiting_clients: VecDeque<wait_ready::Notifier>,
}

impl RillClient {
    pub fn new(url: Option<String>) -> Self {
        let url = url.unwrap_or_else(|| "http://localhost:1636".into());
        Self {
            url,
            sender: None,
            awaiting_clients: VecDeque::new(),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Group {
    WsConnection,
}

impl Actor for RillClient {
    type GroupBy = Group;
}

#[async_trait]
impl<T: Actor> StartedBy<T> for RillClient {
    async fn handle(&mut self, ctx: &mut Context<Self>) -> Result<(), Error> {
        // TODO: Use `strum` here
        ctx.termination_sequence(vec![Group::WsConnection]);

        let client = WsClient::new(
            self.url.clone(),
            Some(Duration::from_secs(1)),
            ctx.address().clone(),
        );
        ctx.spawn_task(client, (), Group::WsConnection);

        Ok(())
    }
}

#[async_trait]
impl<T: Actor> InterruptedBy<T> for RillClient {
    async fn handle(&mut self, ctx: &mut Context<Self>) -> Result<(), Error> {
        ctx.shutdown();
        Ok(())
    }
}

#[async_trait]
impl InstantActionHandler<WsClientStatus<ClientProtocol>> for RillClient {
    async fn handle(
        &mut self,
        status: WsClientStatus<ClientProtocol>,
        _ctx: &mut Context<Self>,
    ) -> Result<(), Error> {
        match status {
            WsClientStatus::Connected { sender } => {
                self.sender = Some(sender);
                self.notify_awaiting_clients();
            }
            WsClientStatus::Failed { reason } => {
                log::error!("Connection failed: {}", reason);
                self.sender.take();
            }
        }
        Ok(())
    }
}

#[async_trait]
impl
    ActionHandler<WsIncoming<ServiceEnvelope<ClientProtocol, ClientResponse, ClientServiceRequest>>>
    for RillClient
{
    async fn handle(
        &mut self,
        msg: WsIncoming<ServiceEnvelope<ClientProtocol, ClientResponse, ClientServiceRequest>>,
        _ctx: &mut Context<Self>,
    ) -> Result<(), Error> {
        log::trace!("Incoming to exporter: {:?}", msg);
        match msg.0 {
            ServiceEnvelope::Envelope(envelope) => {
                let _direct_id = envelope.direct_id;
                match envelope.data {
                    ClientResponse::Declare(entry_id) => {
                        log::info!("Connected to: {}", entry_id);
                    }
                    evt => {
                        log::error!("Not implemented for {:?}", evt);
                    }
                }
            }
            ServiceEnvelope::Service(_) => {
                log::error!("Service message is not supported yet.");
            }
        }
        Ok(())
    }
}

#[async_trait]
impl TaskEliminated<WsClient<ClientProtocol, Self>, ()> for RillClient {
    async fn handle(
        &mut self,
        _id: IdOf<WsClient<ClientProtocol, Self>>,
        _tag: (),
        _result: Result<(), TaskError>,
        _ctx: &mut Context<Self>,
    ) -> Result<(), Error> {
        // TODO: Drop unfinished tasks
        Ok(())
    }
}