use std::time::{Duration, Instant};

use crossterm::event;
use crossterm::event::{Event, KeyCode};
use sea_battle_backend::human_player_ws::{ClientMessage, ServerMessage};
use sea_battle_backend::utils::Res;
use tui::backend::Backend;
use tui::{Frame, Terminal};

use crate::client::Client;
use crate::constants::*;
use crate::ui_screens::confirm_dialog::confirm;
use crate::ui_screens::popup_screen::PopupScreen;
use crate::ui_screens::set_boats_layout::SetBoatsLayoutScreen;
use crate::ui_screens::ScreenResult;

enum GameStatus {
    Pending,
    WaitingForOpponentBoatsConfig,
    OpponentReady,
    Starting,
}

pub struct GameScreen {
    client: Client,
    status: GameStatus,
    opponent_name: Option<String>,
}

impl GameScreen {
    pub fn new(client: Client) -> Self {
        Self {
            client,
            status: GameStatus::Pending,
            opponent_name: None,
        }
    }

    pub async fn show<B: Backend>(mut self, terminal: &mut Terminal<B>) -> Res<ScreenResult> {
        let mut last_tick = Instant::now();
        loop {
            // Update UI
            terminal.draw(|f| self.ui(f))?;

            let timeout = TICK_RATE
                .checked_sub(last_tick.elapsed())
                .unwrap_or_else(|| Duration::from_secs(0));

            // Handle terminal events
            if crossterm::event::poll(timeout)? {
                if let Event::Key(key) = event::read()? {
                    match key.code {
                        // Leave game
                        KeyCode::Char('q')
                            if confirm(terminal, "Do you really want to leave game?") =>
                        {
                            return Ok(ScreenResult::Canceled);
                        }
                        _ => {}
                    }
                }
            }

            // Handle incoming messages
            while let Some(msg) = self.client.try_recv_next_message().await? {
                match msg {
                    ServerMessage::SetInviteCode { .. } => unimplemented!(),
                    ServerMessage::InvalidInviteCode => unimplemented!(),
                    ServerMessage::WaitingForAnotherPlayer => unimplemented!(),
                    ServerMessage::OpponentConnected => unimplemented!(),
                    ServerMessage::SetOpponentName { name } => self.opponent_name = Some(name),

                    ServerMessage::QueryBoatsLayout { rules } => {
                        match SetBoatsLayoutScreen::new(&rules)
                            .set_confirm_on_cancel(true)
                            .show(terminal)?
                        {
                            ScreenResult::Ok(layout) => {
                                self.client
                                    .send_message(&ClientMessage::BoatsLayout { layout })
                                    .await?
                            }
                            ScreenResult::Canceled => {
                                return Ok(ScreenResult::Canceled);
                            }
                        };
                    }

                    ServerMessage::RejectedBoatsLayout { .. } => {
                        PopupScreen::new("Server rejected boats layout!! (is your version of SeaBattle up to date?)")
                            .show(terminal)?;
                    }

                    ServerMessage::WaitingForOtherPlayerConfiguration => {
                        self.status = GameStatus::WaitingForOpponentBoatsConfig;
                    }

                    ServerMessage::OpponentReady => {
                        self.status = GameStatus::OpponentReady;
                    }

                    ServerMessage::GameStarting => {
                        self.status = GameStatus::Starting;
                    }

                    ServerMessage::OpponentMustFire { .. } => {}
                    ServerMessage::RequestFire { .. } => {}
                    ServerMessage::FireResult { .. } => {}
                    ServerMessage::OpponentFireResult { .. } => {}
                    ServerMessage::LostGame { .. } => {}
                    ServerMessage::WonGame { .. } => {}
                    ServerMessage::OpponentRequestedRematch => {}
                    ServerMessage::OpponentAcceptedRematch => {}
                    ServerMessage::OpponentRejectedRematch => {}
                    ServerMessage::OpponentLeftGame => {}
                    ServerMessage::OpponentReplacedByBot => {}
                }
            }

            if last_tick.elapsed() >= TICK_RATE {
                last_tick = Instant::now();
            }
        }
    }

    fn opponent_name(&self) -> &str {
        self.opponent_name.as_deref().unwrap_or("opponent")
    }

    fn ui<B: Backend>(&mut self, f: &mut Frame<B>) {
        // If game is still starting
        if matches!(self.status, GameStatus::Pending) {
            PopupScreen::new("Game is pending...").show_in_frame(f);
            return;
        }

        // If game is still starting
        if matches!(self.status, GameStatus::WaitingForOpponentBoatsConfig) {
            PopupScreen::new(&format!(
                "Waiting for boats configuration of {}...",
                self.opponent_name()
            ))
            .show_in_frame(f);
            return;
        }

        // If game is still starting
        if matches!(self.status, GameStatus::OpponentReady) {
            PopupScreen::new(&format!("{} is ready!", self.opponent_name())).show_in_frame(f);
            return;
        }

        // If game is still starting
        if matches!(self.status, GameStatus::Starting) {
            PopupScreen::new("Game is starting...").show_in_frame(f);
            return;
        }
    }
}