/*
 * This file is part of laurelin/server
 * Copyright (C) 2023 Jonni Liljamo <jonni@liljamo.com>
 *
 * Licensed under GPL-3.0-only.
 * See LICENSE for licensing information.
 */

use bevy_ecs::{
    event::EventReader,
    system::{Res, ResMut},
};
use bevy_log::info;
use laurelin_shared::{
    api::user::{login, register, ResponseLogin, ResponseRegister},
    server::{
        channels::AfterAuthChannel,
        messages::{AfterAuth, Auth},
    },
};
use naia_bevy_server::{
    events::{AuthEvents, ConnectEvent, DisconnectEvent, ErrorEvent, TickEvent},
    Server,
};

use crate::{Config, Global, RuntimeTemp};

pub(crate) fn auth_events(
    mut ev: EventReader<AuthEvents>,
    mut server: Server,
    config: Res<Config>,
    mut temp: ResMut<RuntimeTemp>,
) {
    for events in ev.iter() {
        for (user_key, auth) in events.read::<Auth>() {
            // TODO: accept a third type of authentication: existing session
            //       the client passes a cookie that it had stored,
            //       and we verify it with the api, returning the very same aa details.

            match auth.username {
                Some(username) => {
                    // register
                    let wrapped =
                        register(&config.api_address, &username, &auth.email, &auth.password);
                    match wrapped.response {
                        ResponseRegister::Error(_) => server.reject_connection(&user_key),
                        ResponseRegister::Ok(user) => {
                            server.accept_connection(&user_key);
                            temp.afterauth_details
                                .insert(user_key, (user.username, wrapped.cookie));
                        }
                    }
                }
                None => {
                    // login
                    let wrapped = login(&config.api_address, &auth.email, &auth.password);
                    match wrapped.response {
                        ResponseLogin::Error(_) => server.reject_connection(&user_key),
                        ResponseLogin::Ok(user) => {
                            server.accept_connection(&user_key);
                            temp.afterauth_details
                                .insert(user_key, (user.username, wrapped.cookie));
                        }
                    }
                }
            }
        }
    }
}

pub(crate) fn connect_events(
    mut ev: EventReader<ConnectEvent>,
    mut server: Server,
    mut temp: ResMut<RuntimeTemp>,
    mut global: ResMut<Global>,
) {
    for ConnectEvent(user_key) in ev.iter() {
        let address = server.user(user_key).address();
        info!("Naia Server connected to: {:?}", address);

        // TODO: handle
        let aa_details = temp.afterauth_details.get(user_key).unwrap();
        server.send_message::<AfterAuthChannel, AfterAuth>(
            &user_key,
            &AfterAuth {
                username: aa_details.0.clone(),
                cookie: aa_details.1.clone(),
            },
        );

        global
            .user_to_session_map
            .insert(*user_key, aa_details.1.clone());

        temp.afterauth_details.remove(&user_key);
    }
}

pub(crate) fn disconnect_events(mut ev: EventReader<DisconnectEvent>, mut global: ResMut<Global>) {
    for DisconnectEvent(user_key, user) in ev.iter() {
        info!("Naia Server disconnected from: {:?}", user.address);

        global.user_to_session_map.remove(user_key);
    }
}

pub(crate) fn error_events(mut ev: EventReader<ErrorEvent>) {
    for ErrorEvent(error) in ev.iter() {
        info!("Naia Server Error: {:?}", error);
    }
}

pub(crate) fn tick_events(mut ev: EventReader<TickEvent>, mut server: Server) {
    let mut has_ticked = false;

    for TickEvent(server_tick) in ev.iter() {
        has_ticked = true;

        // Handle messages coming from clients
        let mut _messages = server.receive_tick_buffer_messages(server_tick);
    }

    if has_ticked {
        // Update scopes of entities
        // Not sure if this will come into play,
        // but see naia/demos/bevy/server/src/systems/events.rs::tick_events
        //for (_, user_key, entity) in server.scope_checks() {
        // ...
        //}
    }
}