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use std::{collections::HashMap, convert::TryFrom};

use async_std::sync::Arc;
use futures::{channel::mpsc::Receiver, sink::SinkExt, stream::StreamExt};
use log::{debug, error};

use koibumi_core::{address::Address, identity::Private as PrivateIdentity, message, object};

use crate::{connection_loop::Context, manager::Event as BmEvent};

/// An object represents an user.
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
pub struct User {
    id: Vec<u8>,
    subscriptions: Vec<Address>,
    private_identities: Vec<PrivateIdentity>,
}

impl User {
    /// Constructs a new user object from an ID and a subscription list.
    pub fn new(
        id: Vec<u8>,
        subscriptions: Vec<Address>,
        private_identities: Vec<PrivateIdentity>,
    ) -> Self {
        Self {
            id,
            subscriptions,
            private_identities,
        }
    }
}

#[derive(Debug)]
pub enum Event {
    User(User),
    //Getpubkey(message::Object),
    //Pubkey(message::Object),
    Msg(message::Object),
    Broadcast(message::Object),
    AddIdentity {
        id: Vec<u8>,
        identity: PrivateIdentity,
    },
    Subscribe {
        id: Vec<u8>,
        address: Address,
    },
}

pub async fn manage(ctx: Arc<Context>, mut receiver: Receiver<Event>) {
    let mut bm_event_sender = ctx.bm_event_sender().clone();

    let mut users: HashMap<Vec<u8>, User> = HashMap::new();

    while let Some(event) = receiver.next().await {
        match event {
            Event::User(user) => {
                users.insert(user.id.clone(), user);
            }
            Event::Msg(object) => match object::Msg::try_from(object.clone()) {
                Ok(msg) => {
                    for user in users.values() {
                        for identity in &user.private_identities {
                            if let Err(_err) = msg.decrypt(object.header(), identity) {
                                continue;
                            }

                            if let Err(_err) = bm_event_sender
                                .send(BmEvent::Msg {
                                    user_id: user.id.clone(),
                                    address: identity.address().clone(),
                                    object: object.clone(),
                                })
                                .await
                            {
                                continue;
                            }
                        }
                    }
                }
                Err(err) => {
                    debug!("{}", err);
                }
            },
            Event::Broadcast(object) => match object::Broadcast::try_from(object.clone()) {
                Ok(broadcast) => {
                    for user in users.values() {
                        for subscription in &user.subscriptions {
                            match &broadcast {
                                object::Broadcast::V4(_) => {
                                    if let Err(_err) =
                                        broadcast.decrypt(object.header(), &subscription)
                                    {
                                        continue;
                                    }
                                }
                                object::Broadcast::V5(v5) => {
                                    if subscription.broadcast_tag() != *v5.tag() {
                                        continue;
                                    }
                                }
                            }

                            if let Err(err) = bm_event_sender
                                .send(BmEvent::Broadcast {
                                    user_id: user.id.clone(),
                                    address: subscription.clone(),
                                    object: object.clone(),
                                })
                                .await
                            {
                                error!("{}", err);
                                continue;
                            }
                        }
                    }
                }
                Err(err) => {
                    debug!("{}", err);
                }
            },
            Event::AddIdentity { id, identity } => {
                if let Some(user) = users.get_mut(&id) {
                    if !user.private_identities.contains(&identity) {
                        user.private_identities.push(identity);
                    }
                }
            }
            Event::Subscribe { id, address } => {
                if let Some(user) = users.get_mut(&id) {
                    if !user.subscriptions.contains(&address) {
                        user.subscriptions.push(address);
                    }
                }
            }
        }
    }
}