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use std::collections::HashMap;
use std::sync::mpsc;
use std::sync::{Arc, Mutex};
use std::thread;
use std::thread::JoinHandle;

use crate::backend_connection::*;
use crate::error::ServerError;
use crate::group::{Group, GroupId, Message as GroupMessage};
use log::{error, info, warn};
use ws::{listen, CloseCode, Handler, Handshake, Message, Request, Response, Sender};

const PROTOCOL: &str = "tuesday";
// WebSocket connection handler for the server connection
pub struct Socket {
    ws: Sender,
    group: mpsc::Sender<GroupMessage>,
    groups: Arc<Mutex<HashMap<u32, Group>>>,
    ip: String,
    id: GroupId,
}

pub fn run(address: &str, port: &str) -> Result<JoinHandle<()>, ServerError> {
    let count = Arc::new(Mutex::new(HashMap::new()));
    let (sender, _) = mpsc::channel();
    let url = format!("{}:{}", address, port);
    thread::Builder::new()
        .name("server".to_owned())
        .spawn(move || {
            listen(url, |out| Socket {
                ws: out,
                group: sender.clone(),
                groups: count.clone(),
                ip: "No ip".to_owned(),
                id: 0,
            })
            .unwrap()
        })
        .map_err(ServerError::WebSocketCreation)
}

impl Handler for Socket {
    // called when the socket connection is created
    fn on_open(&mut self, handshake: Handshake) -> ws::Result<()> {
        if let Ok(Some(ip)) = handshake.remote_addr() {
            self.ip = ip;
        }
        Ok(())
    }

    fn on_message(&mut self, msg: Message) -> ws::Result<()> {
        info!("Socket got message '{}'. ", msg);

        self.group
            .send(GroupMessage::Data((self.ip.clone(), msg.into_data())))
            .unwrap_or_else(|err| {
                let err = format!("failed to deliver internal message {}", err);
                error!("{}", err);
                self.ws
                    .close_with_reason(CloseCode::Error, err)
                    .unwrap_or_else(|e| error!("failed to send message to client {}", e));
            });

        Ok(())
    }

    fn on_close(&mut self, _: CloseCode, _: &str) {
        if let Ok(mut guard) = self.groups.lock() {
            if let Some(group) = guard.get_mut(&self.id) {
                if group.remove_client(&self.ws).is_err() {
                    warn!("failed to remove Client from Game");
                }
                if group.clients.is_empty() {
                    //guard.remove(&self.id); // TODO
                }
            }
        }
    }

    // low-level handling of requests
    fn on_request(&mut self, req: &Request) -> ws::Result<Response> {
        let (res, token) = handshake(req);
        Ok(
            match token
                .and_then(|token| {
                    info!("received token: {}", token);
                    crate::backend_connection::verify_token(token)
                })
                .and_then(move |response| self.handle_token(response))
            {
                Ok(()) => res,
                Err(err) => fail_response(
                    res,
                    format!("Client {:?}: {:?}", req.client_addr(), err).as_str(),
                ),
            },
        )
    }
}

impl Socket {
    fn handle_token(&mut self, response: TokenResponse) -> Result<(), ServerError> {
        match self.groups.lock() {
            Ok(mut guard) => {
                self.id = response.group_id;
                if !guard.contains_key(&response.group_id) {
                    let group = Group::new(response)?;
                    self.group = group.sender.clone();
                    guard.insert(group.id(), group);
                }

                // panics if any thread panicked while using the mutex
                let group = &mut self.group;
                guard
                    .get_mut(&self.id)
                    .unwrap()
                    .add_client(self.ws.clone())
                    .map(|s| *group = s)
            }
            Err(e) => Err(ServerError::Group(format!(
                "cold not add client {:?}  to group {}: {}",
                self.ws, response.group_id, e
            ))),
        }
    }
}

fn handshake(req: &Request) -> (Response, Result<i32, ServerError>) {
    let mut res = Response::from_request(req).unwrap();
    if let Ok(protocols) = req.protocols() {
        if protocols.iter().any(|pro| pro.contains(PROTOCOL)) {
            res.set_protocol(PROTOCOL)
        } else {
            return (
                fail_response(
                    res,
                    format!("does not support the {} protocol", PROTOCOL).as_str(),
                ),
                Err(ServerError::InvalidProtocol),
            );
        }
        let token = protocols.iter().find(|pro| pro.starts_with("Token-"));
        match token {
            Some(token) => {
                let (_, token) = token.split_at(6);
                if let Ok(token) = token.parse::<i32>() {
                    (res, Ok(token))
                } else {
                    (
                        fail_response(res, "token is no valid i32"),
                        Err(ServerError::InvalidTokenFormat),
                    )
                }
            }
            None => (
                fail_response(res, "no token in protocols"),
                Err(ServerError::InvalidToken(
                    "No Token was passed as a Protocol in the Sec-WebSocket-Protocol Header"
                        .to_string(),
                )),
            ),
        }
    } else {
        (
            fail_response(res, "failed to retrieve protocols"),
            Err(ServerError::InvalidProtocol),
        )
    }
}

fn fail_response(mut res: Response, reason: &str) -> Response {
    res.set_status(400);
    res.set_reason(reason);
    warn!("{}", reason);
    res
}