// ---------------
// Module overview
// ---------------
//
// DiscordInfo: describes a Discord user's information
//
// ClientInfo:  describes a client's identifying information,
//              both for websocket and Discord connections.
//              Webscoket connections have the option to store
//              DiscordInfo as well for verified connections.
//
// Client:      describes a client, holding ClientInfo and Rc<Room>

use crate::room::Room;

use simple_websockets::{Message, Responder};
use std::cell::RefCell;
use std::cmp::{Eq, PartialEq};
use std::hash::{Hash, Hasher};
use std::rc::Rc;

pub struct DiscordInfo {
    pub username: String,
    pub discriminator: u16,
    pub id: u64,
}

impl PartialEq for DiscordInfo {
    fn eq(&self, other: &Self) -> bool {
        self.id == other.id
    }
}

impl Eq for DiscordInfo {}

pub enum ClientInfo {
    Ws {
        id: u64,
        responder: Responder,
        discord_info: Option<DiscordInfo>,
    },
    Discord {
        discord_info: DiscordInfo,
    },
}

impl ClientInfo {
    fn id(&self) -> u64 {
        match self {
            Self::Ws {
                id, discord_info, ..
            } => match discord_info {
                // Discord-verified websocket connection
                Some(discord_info) => discord_info.id,
                // Anonymous websocket connection
                None => *id,
            },
            // Discord connection
            Self::Discord { discord_info } => discord_info.id,
        }
    }
}

impl PartialEq for ClientInfo {
    fn eq(&self, other: &Self) -> bool {
        self.id() == other.id()
    }
}

impl Eq for ClientInfo {}

impl Hash for ClientInfo {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.id().hash(state)
    }
}

pub struct Client {
    info: ClientInfo,
    pub room: Rc<RefCell<Room>>,
}

impl Client {
    pub fn new(info: ClientInfo, room: Rc<RefCell<Room>>) -> Self {
        Self { info, room }
    }

    pub fn id(&self) -> u64 {
        match self.info {
            ClientInfo::Ws { id, .. } => id,
            ClientInfo::Discord { .. } => unimplemented!("no id for Discord connections"),
        }
    }

    pub fn send(&self, message: Message) -> bool {
        match &self.info {
            ClientInfo::Ws { responder, .. } => responder.send(message),
            ClientInfo::Discord { .. } => {
                unimplemented!("no networking implementation for Discord connections")
            }
        }
    }

    // Returns (old_room, &new_room)
    pub fn switch_rooms(&mut self, new_room: Rc<RefCell<Room>>) -> (Rc<RefCell<Room>>, Rc<RefCell<Room>>) {
        (std::mem::replace(&mut self.room, new_room), self.room.clone())
    }
}

impl PartialEq for Client {
    fn eq(&self, other: &Self) -> bool {
        self.info.eq(&other.info)
    }
}

impl Eq for Client {}

impl Hash for Client {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.info.hash(state)
    }
}