use anyhow::Context;

use serde::{Deserialize, Serialize};

use zlink::{ReplyError, service::MethodReply};

use crate::{

    proto::{WhodStatusUpdate, WhodUserEntry, finger_protocol::FingerResponse},

    server::rwhod::RwhodStatusStore,

};

// Types for 'no.ntnu.pvv.roowho2.rwhod'

#[zlink::proxy("no.ntnu.pvv.roowho2.rwhod")]

pub trait VarlinkRwhodClientProxy {

    async fn rwho(

        &mut self,

        all: bool,

    ) -> zlink::Result<Result<VarlinkRwhoResponse, VarlinkRwhodClientError>>;

    async fn ruptime(

        &mut self,

    ) -> zlink::Result<Result<VarlinkRuptimeResponse, VarlinkRwhodClientError>>;

}

#[derive(Debug, Deserialize)]

#[serde(tag = "method", content = "parameters")]

pub enum VarlinkRwhodClientRequest {

    #[serde(rename = "no.ntnu.pvv.roowho2.rwhod.Rwho")]

    Rwho {

        /// Retrieve all users, even those that have been idle for a long time.

        all: bool,

    },

    #[serde(rename = "no.ntnu.pvv.roowho2.rwhod.Ruptime")]

    Ruptime,

}

#[derive(Debug, Clone, PartialEq, Serialize)]

#[serde(untagged)]

pub enum VarlinkRwhodClientResponse {

    Rwho(VarlinkRwhoResponse),

    Ruptime(VarlinkRuptimeResponse),

}

pub type VarlinkRwhoResponse = Vec<(String, WhodUserEntry)>;

pub type VarlinkRuptimeResponse = Vec<WhodStatusUpdate>;

#[derive(Debug, Clone, PartialEq, ReplyError)]

#[zlink(interface = "no.ntnu.pvv.roowho2.rwhod")]

pub enum VarlinkRwhodClientError {

    InvalidRequest,

}

// Types for 'no.ntnu.pvv.roowho2.finger'

#[zlink::proxy("no.ntnu.pvv.roowho2.finger")]

pub trait VarlinkFingerClientProxy {

    async fn finger(

        &mut self,

        user_queries: Vec<String>,

    ) -> zlink::Result<Result<VarlinkFingerResponse, VarlinkFingerClientError>>;

}

#[derive(Debug, Deserialize)]

#[serde(tag = "method", content = "parameters")]

pub enum VarlinkFingerClientRequest {

    #[serde(rename = "no.ntnu.pvv.roowho2.finger.Finger")]

    Finger { user_queries: Vec<String> },

}

#[derive(Debug, Serialize)]

#[serde(untagged)]

pub enum VarlinkFingerClientResponse {

    Finger(VarlinkFingerResponse),

}

pub type VarlinkFingerResponse = FingerResponse;

#[derive(Debug, Clone, PartialEq, ReplyError)]

#[zlink(interface = "no.ntnu.pvv.roowho2.finger")]

pub enum VarlinkFingerClientError {

    InvalidRequest,

}

// --------------------

#[derive(Debug, Deserialize)]

#[serde(untagged)]

#[allow(unused)]

pub enum VarlinkMethod {

    Rwhod(VarlinkRwhodClientRequest),

    Finger(VarlinkFingerClientRequest),

}

#[derive(Debug, Serialize)]

#[serde(untagged)]

#[allow(unused)]

pub enum VarlinkReply {

    Rwhod(VarlinkRwhodClientResponse),

    Finger(VarlinkFingerClientResponse),

}

#[derive(Debug, Clone, PartialEq, Serialize)]

#[serde(untagged)]

#[allow(unused)]

pub enum VarlinkReplyError {

    Rwhod(VarlinkRwhodClientError),

    Finger(VarlinkFingerClientError),

}

#[derive(Debug, Clone)]

pub struct VarlinkRoowhoo2ClientServer {

    whod_status_store: RwhodStatusStore,

}

impl VarlinkRoowhoo2ClientServer {

    pub fn new(whod_status_store: RwhodStatusStore) -> Self {

        Self { whod_status_store }

    }

}

impl VarlinkRoowhoo2ClientServer {

    // TODO: handle 'all' parameter

    async fn handle_rwho_request(&self, _all: bool) -> VarlinkRwhoResponse {

        let store = self.whod_status_store.read().await;

        let mut all_user_entries = Vec::with_capacity(store.len());

        for status_update in store.values() {

            all_user_entries.extend_from_slice(

                &status_update

                    .users

                    .iter()

                    .collect::<Vec<(String, WhodUserEntry)>>(),

            );

        }

        all_user_entries

    }

    async fn handle_ruptime_request(&self) -> VarlinkRuptimeResponse {

        let store = self.whod_status_store.read().await;

        store.values().cloned().collect()

    }

}

impl zlink::Service for VarlinkRoowhoo2ClientServer {

    type MethodCall<'de> = VarlinkMethod;

    type ReplyParams<'se> = VarlinkReply;

    type ReplyStreamParams = ();

    type ReplyStream = futures_util::stream::Empty<zlink::Reply<()>>;

    type ReplyError<'se> = VarlinkReplyError;

    async fn handle<'service, Sock: zlink::connection::Socket>(

        &'service mut self,

        call: &'service zlink::Call<Self::MethodCall<'_>>,

        _conn: &mut zlink::Connection<Sock>,

    ) -> MethodReply<Self::ReplyParams<'service>, Self::ReplyStream, Self::ReplyError<'service>>

    {

        match call.method() {

            VarlinkMethod::Rwhod(VarlinkRwhodClientRequest::Rwho { all }) => {

                MethodReply::Single(Some(VarlinkReply::Rwhod(VarlinkRwhodClientResponse::Rwho(

                    self.handle_rwho_request(*all).await,

                ))))

            }

            VarlinkMethod::Rwhod(VarlinkRwhodClientRequest::Ruptime) => {

                MethodReply::Single(Some(VarlinkReply::Rwhod(

                    VarlinkRwhodClientResponse::Ruptime(self.handle_ruptime_request().await),

                )))

            }

            VarlinkMethod::Finger(VarlinkFingerClientRequest::Finger { user_queries: _ }) => {

                unimplemented!()

            }

        }

    }

}

    let service = VarlinkRoowhoo2ClientServer::new(whod_status_store);

    let server = zlink::Server::new(socket, service);

    tracing::info!("Starting Rwhod client API server");

    server

        .run()

        .await

        .context("Rwhod client API server failed")?;

    Ok(())

}