use std::sync::{Arc, RwLock};

use iced::{
    Alignment::Center,
    Element, Task, Theme,
    widget::{button, column, row},
};
use protocol::BUFFER_LENGTH;
use tokio::sync::{
    broadcast::{self},
    oneshot,
};

use crate::{ClientConfig, stream::connect, voice::record};

#[derive(Debug, Default)]
struct Signal {
    microphone: Option<oneshot::Sender<bool>>,
    // speaker: Option<oneshot::Sender<bool>>,
    connection: Option<oneshot::Sender<bool>>,
}

#[derive(Debug)]
struct Channel {
    microphone: broadcast::Sender<f32>,
    // speaker: (broadcast::Sender<f32>, broadcast::Receiver<f32>),
}

impl Channel {
    fn new() -> Self {
        Self {
            microphone: broadcast::channel(BUFFER_LENGTH).0,
            // speaker: broadcast::channel(BUFFER_LENGTH),
        }
    }
}

#[derive(Debug, Default, Clone, Copy)]
struct GUIStatus {
    room: State,
    microphone: State,
}

#[derive(Debug, Clone, Copy)]
pub enum State {
    Active,
    Passive,
    Loading,
}
impl Default for State {
    fn default() -> Self {
        State::Passive
    }
}

#[derive(Debug, Clone, Copy)]
pub enum Message {
    State,
    JoinRoom,
    LeaveRoom,
    UnmuteMicrophone,
    MuteMicrophone,
}

#[derive(Debug)]
pub struct App {
    client_config: Arc<ClientConfig>,
    gui_status: Arc<RwLock<GUIStatus>>,
    channel: Channel,
    signal: Signal,
}

impl App {
    pub fn theme(&self) -> Theme {
        Theme::Dark
    }

    pub fn new() -> Self {
        App {
            client_config: ClientConfig::new().into(),
            gui_status: RwLock::new(GUIStatus::default()).into(),
            channel: Channel::new(),
            signal: Signal::default(),
        }
    }
    pub fn view(&self) -> Element<'_, Message> {
        let join_room_button = match self.gui_status.read().unwrap().room {
            State::Active => button("Leave Room").on_press(Message::LeaveRoom),
            State::Passive => button("Join Room").on_press(Message::JoinRoom),
            State::Loading => button("Loading"),
        };

        let microphone_button = match self.gui_status.read().unwrap().microphone {
            State::Active => button("Mute").on_press(Message::MuteMicrophone),
            State::Passive => button("Unmute").on_press(Message::UnmuteMicrophone),
            State::Loading => button("Loading"),
        };
        column![
            row![join_room_button, microphone_button]
                .spacing(20)
                .align_y(Center)
        ]
        .align_x(Center)
        .into()
    }
    pub fn update(&mut self, message: Message) -> Task<Message> {
        match message {
            Message::State => Task::none(),
            Message::JoinRoom => {
                self.gui_status.write().unwrap().room = State::Loading;
                let client_config = self.client_config.clone();
                let gui_status = self.gui_status.clone();
                let microphone_receiver = self.channel.microphone.subscribe();

                let connection_signal = oneshot::channel();
                self.signal.connection = Some(connection_signal.0);
                Task::perform(
                    connect(connection_signal.1, microphone_receiver, client_config),
                    move |result| match result {
                        Ok(_) => gui_status.write().unwrap().room = State::Active,
                        Err(err_val) => {
                            eprintln!("Error: Join Room | {}", err_val);
                            gui_status.write().unwrap().room = State::Passive;
                        }
                    },
                )
                .map(|_| Message::State)
            }
            Message::LeaveRoom => {
                self.gui_status.write().unwrap().room = State::Loading;
                if let Some(connection_signal) = &self.signal.connection {
                    if !connection_signal.is_closed() {
                        self.signal
                            .connection
                            .take()
                            .expect("Never")
                            .send(true)
                            .unwrap();
                        self.signal.connection = None;
                        self.gui_status.write().unwrap().room = State::Passive;
                    }
                }
                Task::none()
            }
            Message::UnmuteMicrophone => {
                self.gui_status.write().unwrap().microphone = State::Active;
                let microphone_sender = self.channel.microphone.clone();
                let microphone_stop_signal = oneshot::channel();
                self.signal.microphone = Some(microphone_stop_signal.0);
                Task::perform(record(microphone_sender, microphone_stop_signal.1), |_| {
                    Message::State
                })
            }
            Message::MuteMicrophone => {
                self.gui_status.write().unwrap().microphone = State::Loading;
                if let Some(microphone_signal) = &self.signal.microphone {
                    if !microphone_signal.is_closed() {
                        self.signal
                            .microphone
                            .take()
                            .expect("Never")
                            .send(true)
                            .unwrap();
                        self.signal.microphone = None;
                        self.gui_status.write().unwrap().microphone = State::Passive;
                    }
                }
                Task::none()
            }
        }
    }
}