use std::i32;

use godot::{
    classes::{
        Engine, IVBoxContainer, InputEvent, LineEdit, RichTextLabel, ScrollContainer, VBoxContainer,
    },
    global::HorizontalAlignment,
    prelude::*,
};

use crate::{
    chat::Chat,
    game_manager::Game,
    net::network_manager::{NetworkManager, Package, PeerKind},
};

#[derive(GodotClass)]
#[class(base=VBoxContainer, tool)]
pub struct ChatBox {
    #[export]
    scroll: Option<Gd<ScrollContainer>>,
    #[export]
    messages: Option<Gd<VBoxContainer>>,
    #[export]
    line_edit: Option<Gd<LineEdit>>,
    #[export]
    pub in_game: bool,
    #[export]
    text_alignment: HorizontalAlignment,

    scroll_on_next_update: bool,

    base: Base<VBoxContainer>,
}

#[godot_api]
impl IVBoxContainer for ChatBox {
    fn init(base: Base<VBoxContainer>) -> ChatBox {
        ChatBox {
            scroll: None,
            messages: None,
            line_edit: None,
            in_game: false,
            text_alignment: HorizontalAlignment::LEFT,
            scroll_on_next_update: false,
            base,
        }
    }

    fn ready(&mut self) {
        if !Engine::singleton().is_editor_hint() {
            self.run_deferred(|s| {
                if let Some(chat) = Chat::singleton() {
                    for message in chat.bind().get_messages() {
                        s.on_new_message(message);
                    }
                    chat.signals()
                        .on_new_message()
                        .connect_other(s, |s, m| s.run_deferred(|s| s.on_new_message(m)));
                }
            });

            if let Some(line_edit) = self.line_edit.clone() {
                line_edit
                    .signals()
                    .text_submitted()
                    .connect_other(self, Self::on_submit);
            }
        }

        if self.in_game
            && let Some(line_edit) = &mut self.line_edit
        {
            line_edit.set_visible(false);
        }
    }

    fn process(&mut self, _: f64) {
        if self.scroll_on_next_update
            && let Some(scroll) = &mut self.scroll
        {
            scroll.set_v_scroll(i32::MAX);
            self.scroll_on_next_update = false;
        }
    }

    fn input(&mut self, event: Gd<InputEvent>) {
        if self.in_game && event.is_action_pressed("open_chat") {
            if let Some(line_edit) = &mut self.line_edit {
                let is_visible = line_edit.is_visible();
                if !is_visible {
                    line_edit.set_visible(true);

                    let mut line_edit = line_edit.clone();
                    self.run_deferred(move |_| {
                        if line_edit.is_visible() {
                            line_edit.grab_focus();
                        }
                    });
                    self.signals().on_opened().emit();
                }
            }
        }
    }
}

#[godot_api]
impl ChatBox {
    #[signal]
    pub fn on_opened();
    #[signal]
    pub fn on_closed();

    fn on_new_message(&mut self, mut message: Gd<RichTextLabel>) {
        message.set_horizontal_alignment(self.text_alignment);
        if let Some(messages) = &mut self.messages {
            messages.add_child(&message);
        }
        self.scroll_on_next_update = true;
    }

    pub fn on_submit(&mut self, message: GString) {
        let message = message.to_string().trim().to_owned();
        if let Some(line_edit) = &mut self.line_edit {
            line_edit.clear();
            if self.in_game {
                line_edit.set_visible(false);
            }
        }
        self.signals().on_closed().emit();
        if message.is_empty() {
            return;
        }
        if let Some(peer) = &mut NetworkManager::singleton().bind_mut().peer {
            match peer {
                PeerKind::Client(peer, socket_addr) => {
                    peer.send_reliable(socket_addr, Package::ChatMessage(0, message.to_string()));
                }
                PeerKind::Server(..) => {
                    self.run_deferred(move |_| {
                        if let Some(game) = &mut Game::singleton() {
                            let self_id = game.bind().self_id;
                            game.bind_mut()
                                .on_chat_message(self_id.unwrap_or(0), message.to_string());
                        }
                    });
                }
            }
        }
    }

    pub fn is_editing(&self) -> bool {
        if let Some(line_edit) = &self.line_edit {
            line_edit.is_visible()
        } else {
            false
        }
    }
}