use godot::{
    classes::{Button, Camera3D, Label, Panel, SpinBox, TextEdit},
    prelude::*,
    register::property::SimpleVar,
};

use crate::net::network_manager::NetworkManager;

#[derive(Debug, Clone, GodotConvert, Default, Export)]
#[godot(via = u8)]
pub enum Menu {
    #[default]
    MainMenu,
    HostMenu,
    JoinMenu,
}

impl SimpleVar for Menu {}

#[derive(GodotClass)]
#[class(base=Node3D, init, tool)]
pub struct MainMenu {
    #[export]
    camera: Option<Gd<Camera3D>>,

    #[export]
    main_position: Option<Gd<Node3D>>,
    #[export]
    host_position: Option<Gd<Node3D>>,

    #[export]
    main_panel: Option<Gd<Panel>>,
    #[export]
    host_panel: Option<Gd<Panel>>,
    #[export]
    join_panel: Option<Gd<Panel>>,

    #[export]
    host_port: Option<Gd<SpinBox>>,
    #[export]
    join_addr: Option<Gd<TextEdit>>,

    #[export]
    popup_panel: Option<Gd<Panel>>,
    #[export]
    popup_title: Option<Gd<Label>>,
    #[export]
    popup_text: Option<Gd<Label>>,
    #[export]
    popup_button: Option<Gd<Button>>,

    #[export]
    current_menu: Menu,

    prev_panel: Option<Gd<Panel>>,

    base: Base<Node3D>,
}

#[godot_api]
impl INode3D for MainMenu {
    fn ready(&mut self) {
        self.hide_popup();

        NetworkManager::singleton()
            .bind_mut()
            .signals()
            .on_client_disconnected()
            .connect_other(self, |s, msg| {
                if msg.is_empty() {
                    s.show_popup("Disconnected", "disconnected", true);
                } else {
                    s.show_popup("Error", &msg.to_string(), true);
                }
            });
        NetworkManager::singleton()
            .bind_mut()
            .signals()
            .on_error_hosting_server()
            .connect_other(self, |s, msg| {
                s.show_popup("Error Hosting Server", &msg.to_string(), true);
            });
    }

    fn process(&mut self, _delta: f64) {
        if let Some(camera) = &mut self.camera {
            let target = match self.current_menu {
                Menu::MainMenu => {
                    if let Some(pos) = &self.main_position {
                        Some((
                            pos.get_global_position(),
                            pos.get_global_rotation(),
                            self.main_panel.clone(),
                        ))
                    } else {
                        None
                    }
                }
                Menu::HostMenu => {
                    if let Some(pos) = &self.host_position {
                        Some((
                            pos.get_global_position(),
                            pos.get_global_rotation(),
                            self.host_panel.clone(),
                        ))
                    } else {
                        None
                    }
                }
                Menu::JoinMenu => {
                    if let Some(pos) = &self.host_position {
                        Some((
                            pos.get_global_position(),
                            pos.get_global_rotation(),
                            self.join_panel.clone(),
                        ))
                    } else {
                        None
                    }
                }
            };

            if let Some((target_pos, target_rot, target_panel)) = target {
                let prev_pos = camera.get_global_position();
                let prev_rot = camera.get_global_rotation();
                let new_pos = prev_pos.lerp(target_pos, 0.2);
                let new_rot = prev_rot.lerp(target_rot, 0.2);
                camera.set_global_position(new_pos);
                camera.set_global_rotation(new_rot);

                if let Some(mut panel) = target_panel {
                    if let Some(prev_panel) = &mut self.prev_panel {
                        if prev_panel.instance_id() != panel.instance_id() {
                            prev_panel.set_visible(false);
                        }
                    }
                    self.prev_panel = Some(panel.clone());
                    panel.set_visible(true);
                }
            }
        }
    }
}

#[godot_api]
impl MainMenu {
    #[func]
    pub fn host_game(&mut self) {
        if let Some(host_port) = &self.host_port {
            NetworkManager::singleton()
                .bind_mut()
                .host(host_port.get_value() as u16);
        }
    }

    #[func]
    pub fn join_game(&mut self) {
        if let Some(addr) = self.join_addr.clone() {
            self.show_popup("Joining", "joining game", false);
            match addr.get_text().to_string().parse() {
                Ok(addr) => {
                    NetworkManager::singleton().bind_mut().join(addr);
                }
                Err(err) => {
                    self.show_popup("Error", &format!("Error joining: {}", err), true);
                }
            }
        }
    }

    #[func]
    pub fn go_to_main_menu(&mut self) {
        self.current_menu = Menu::MainMenu;
    }

    #[func]
    pub fn go_to_host_game(&mut self) {
        self.current_menu = Menu::HostMenu;
    }

    #[func]
    pub fn go_to_join_game(&mut self) {
        self.current_menu = Menu::JoinMenu;
    }

    #[func]
    pub fn quit_game(&mut self) {
        self.base().get_tree().quit();
    }

    pub fn show_popup(&mut self, title: &str, text: &str, ok: bool) {
        if let Some(panel) = &mut self.popup_panel {
            panel.set_visible(true);
            if let Some(title_label) = &mut self.popup_title {
                title_label.set_text(title);
            }
            if let Some(text_label) = &mut self.popup_text {
                text_label.set_text(text);
            }
            if let Some(button) = &mut self.popup_button {
                button.set_visible(ok);
            }
        }
    }

    #[func]
    pub fn hide_popup(&mut self) {
        if let Some(panel) = &mut self.popup_panel {
            panel.set_visible(false);
        }
    }
}