use gtk::{glib, prelude::*, Box, Entry, Label, ListBox};
use gtk::{Application, ApplicationWindow, Button};
use log::error;
use serde::{Deserialize, Serialize};
use tokio::runtime::Handle;
use tokio_tungstenite::tungstenite::Message;

use crate::config::{load_config, save_config};
// use crate::{joystick_loop, JoystickThreadUpdate};
use crate::coordinator::{start_coordinator, ApplicationEvent, MoveEvent};

#[derive(Debug, Serialize, Deserialize, Clone)]
pub struct AppState {
    pub ip: String,
    pub port: u32,
}

impl Default for AppState {
    fn default() -> Self {
        AppState {
            ip: "10.0.0.30".to_string(),
            port: 8765,
        }
    }
}

pub enum GuiUpdate {
    SocketState(bool),
    MoveEvent(MoveEvent),
}

pub fn build_ui(app: &Application, runtime: Handle) {
    let initial_settings = load_config();
    let main_box = ListBox::new();

    // Main Event Channel
    let (to_mec, mec) = async_channel::unbounded::<ApplicationEvent>();
    let (to_gui, gui_recv) = async_channel::bounded::<GuiUpdate>(10);

    runtime.spawn(start_coordinator(
        mec,
        to_mec.clone(),
        to_gui,
        runtime.clone(),
    ));

    // let conn_status_label = Label::new(Some(&"No Connection".to_string()));
    let conn_status_label = Label::builder()
        .label("No Connection".to_string())
        .can_focus(true)
        .build();

    let content_box = Box::builder()
        .orientation(gtk::Orientation::Vertical)
        .spacing(10)
        .margin_top(12)
        .margin_start(24)
        .margin_end(24)
        .margin_bottom(12)
        .build();

    let ip_entry = Entry::builder()
        .placeholder_text("IP Address")
        .text(initial_settings.ip)
        .can_focus(true)
        .build();
    let port_entry = Entry::builder()
        .placeholder_text("Port")
        .text(initial_settings.port.to_string())
        .can_focus(true)
        .build();
    let button = Button::builder().margin_top(12).build();
    let button2 = Button::builder().margin_top(12).build();

    content_box.append(&ip_entry);
    content_box.append(&port_entry);
    content_box.append(&button);

    let axis_label = Label::builder()
        .label("X:   0    Y:   )")
        .justify(gtk::Justification::Center)
        .css_classes(vec!["JoystickCurrent"])
        .build();

    main_box.append(&conn_status_label);
    main_box.append(&content_box);
    main_box.append(&axis_label);
    main_box.append(&button2);

    // Connect to "clicked" signal of `button`
    button.connect_clicked(glib::clone!(@weak ip_entry, @weak port_entry, @strong to_mec => move |_button| {
        let ip_text = ip_entry.text();
        let port_text = port_entry.text();

        if ip_text.len() == 0 {
            return;
        }
        if let Ok(val) = port_text.parse::<u32>() {
            if let Err(error) = save_config(&AppState {
                ip: ip_text.to_string(),
                port: val
            }) {
                error!("{error}");
            };

            match to_mec.try_send(ApplicationEvent::StartSocket(
                format!("ws://{}:{}", ip_text, val),
            )) {
                Ok(_) => {},
                Err(async_channel::TrySendError::Closed(_)) => panic!("Coordinator MEC is closed. Unrecoverable error."),
                Err(e) => error!("There was an error sending to the MEC: {}", e),
            }
        }
    }));

    button2.connect_clicked(glib::clone!(@strong to_mec => move |_button| {
        if let Err(e) = to_mec.try_send(ApplicationEvent::SocketMessage(Message::text("U45:L10"), 1)) {
            panic!("There was an error in connect clicked: {e}");
        }
    }));

    glib::spawn_future_local(
        glib::clone!(@weak axis_label, @weak button, @weak conn_status_label, @weak ip_entry, @weak port_entry, @strong gui_recv => async move {
            while let Ok(d) =  gui_recv.recv().await {
                match d {
                    GuiUpdate::MoveEvent(msg) => {
                        axis_label.set_text(
                            format!("X: {:>4}   Y: {:>4}", msg.x, msg.y).as_str()
                        );
                    }
                    GuiUpdate::SocketState(v) => {
                        let label = {
                            if v {
                                ip_entry.set_sensitive(false);
                                port_entry.set_sensitive(false);
                                "Currently Connected"
                            } else {
                                ip_entry.set_sensitive(true);
                                port_entry.set_sensitive(true);
                                "Currently Disconnected"
                            }
                        };

                        button.set_label(label);
                        conn_status_label.set_label(label);
                        if v {
                            conn_status_label.set_css_classes(&["YesConnection"]);
                            button.set_css_classes(&["YesConnection"]);
                        } else {
                            conn_status_label.set_css_classes(&["NoConnection"]);
                            button.set_css_classes(&["NoConnection"]);
                        }
                    }
                }
            }
        }),
    );

    // Create a window
    let window = ApplicationWindow::builder()
        .application(app)
        .title("VCC Camera Controller")
        .child(&main_box)
        .build();

    window.connect_close_request(move |_| glib::Propagation::Proceed);

    // Present window
    window.present();
}