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file mode 100644 index 0000000..ef956df --- /dev/null +++ b/src/main.rs @@ -0,0 +1,275 @@ +use std::collections::VecDeque; +use std::io::stdout; +use std::sync::mpsc::{self, Receiver}; +use std::thread; + +use crossterm::cursor::MoveTo; +use crossterm::event::{read, Event, KeyCode}; +use crossterm::execute; +use crossterm::style::{Print, Stylize}; +use crossterm::terminal::{ + disable_raw_mode, enable_raw_mode, window_size, Clear, ClearType, EnterAlternateScreen, + LeaveAlternateScreen, +}; + +use game_loop::game_loop; +use rand::random; + +fn main() { + let g = Game::new(); + execute!(stdout(), EnterAlternateScreen); + enable_raw_mode(); + + g.render_board(); + let game = game_loop( + g, + 2, + 2.0, + |g| { + while let Ok(input) = g.game.input.try_recv() { + if let Ok(direction) = input.try_into() { + g.game.direction = direction; + } else { + g.exit(); + } + } + if let Err(gg) = g.game.update() { + g.exit(); + } + }, + |g| { + g.game.render(); + }, + ); + disable_raw_mode(); + execute!(stdout(), LeaveAlternateScreen); +} + +#[derive(Clone, Debug)] +enum BoardState { + Empty, + Apple, + Snake, +} + +#[derive(Debug, Clone, Copy)] +enum Direction { + Left, + Up, + Right, + Down, +} + +#[derive(Debug, Clone, Copy)] +enum Input { + Left, + Up, + Right, + Down, + Exit, +} + +#[derive(Debug, Clone, Copy)] +enum GameOverState { + SnakeBite, + OutOfBounds, +} + +#[derive(Debug)] +enum InputError { + Exit, +} + +impl TryFrom for Direction { + type Error = InputError; + + fn try_from(value: Input) -> Result { + match value { + Input::Up => Ok(Direction::Up), + Input::Right => Ok(Direction::Right), + Input::Down => Ok(Direction::Down), + Input::Left => Ok(Direction::Left), + Input::Exit => Err(Self::Error::Exit), + } + } +} + +#[derive(Debug)] +struct Game { + apple_pos: (usize, usize), + apple_old: (usize, usize), + board_size: (usize, usize), + snake: VecDeque<(usize, usize)>, + snake_old: VecDeque<(usize, usize)>, + direction: Direction, + input: Receiver, +} + +impl Game { + fn new() -> Self { + let mut snake = VecDeque::new(); + for n in 0..5 { + snake.push_back((0, n)); + } + + let (tx, rx) = mpsc::channel::(); + + thread::spawn(move || loop { + loop { + let event = read().unwrap(); + let _send_res = if event == Event::Key(KeyCode::Char('w').into()) + || event == Event::Key(KeyCode::Up.into()) + { + tx.send(Input::Up) + } else if event == Event::Key(KeyCode::Char('d').into()) + || event == Event::Key(KeyCode::Right.into()) + { + tx.send(Input::Right) + } else if event == Event::Key(KeyCode::Char('s').into()) + || event == Event::Key(KeyCode::Down.into()) + { + tx.send(Input::Down) + } else if event == Event::Key(KeyCode::Char('a').into()) + || event == Event::Key(KeyCode::Left.into()) + { + tx.send(Input::Left) + } else if event == Event::Key(KeyCode::Char('q').into()) { + tx.send(Input::Exit) + } else { + Ok(()) + }; + //print!("{:?}", event); + } + }); + let board_size = window_size().map_or((20, 40), |w_size| { + ((w_size.rows - 2).into(), (w_size.columns - 2).into()) + }); + + Game { + apple_pos: Self::gen_apple(board_size.0, board_size.1), + apple_old: Self::gen_apple(board_size.0, board_size.1), + board_size, + snake_old: snake.clone(), + snake, + direction: Direction::Right, + input: rx, + } + } + + fn update(&mut self) -> Result<(), GameOverState> { + let next_pos = self.next_pos()?; + + match self.check_pos(next_pos)? { + BoardState::Apple => { + self.new_apple(); + } + BoardState::Empty => { + self.snake.pop_front(); + } + BoardState::Snake => unreachable!("Snake state returned"), + } + self.snake.push_back(next_pos); + + std::thread::sleep(std::time::Duration::from_millis(250)); + Ok(()) + } + + fn gen_apple(max_x: usize, max_y: usize) -> (usize, usize) { + let x = random::() % max_x; + let y = random::() % max_y; + + (x, y) + } + + fn new_apple(&mut self) { + self.apple_pos = Self::gen_apple(self.board_size.0, self.board_size.1); + } + + fn next_pos(&self) -> Result<(usize, usize), GameOverState> { + let head = self.snake.back().unwrap(); + match self.direction { + Direction::Up => Ok(( + head.0.checked_sub(1).ok_or(GameOverState::OutOfBounds)?, + head.1, + )), + Direction::Left => Ok(( + head.0, + head.1.checked_sub(1).ok_or(GameOverState::OutOfBounds)?, + )), + Direction::Down => Ok((head.0 + 1, head.1)), + Direction::Right => Ok((head.0, head.1 + 1)), + } + } + + fn check_pos(&self, pos: (usize, usize)) -> Result { + if pos.1 >= self.board_size.1 || pos.0 >= self.board_size.0 { + return Err(GameOverState::OutOfBounds); + } else if pos.1 == self.apple_pos.1 && pos.0 == self.apple_pos.0 { + return Ok(BoardState::Apple); + } + for snake_pos in &self.snake { + if pos.0 == snake_pos.0 && pos.1 == snake_pos.1 { + return Err(GameOverState::SnakeBite); + } + } + return Ok(BoardState::Empty); + } + + fn render_board(&self) { + execute!(stdout(), Clear(ClearType::All), Print("\r\n-".reset())); + for _ in 0..self.board_size.1 { + execute!(stdout(), Print("-")); + } + execute!(stdout(), Print("-\r\n")); + + for x in 0..self.board_size.0 { + execute!(stdout(), Print("|".reset())); + for y in 0..self.board_size.1 { + execute!(stdout(), Print(" ".reset())); + } + execute!(stdout(), Print("|\r\n".reset())); + } + + for _ in 0..self.board_size.1 + 2 { + execute!(stdout(), Print("-")); + } + } + + fn render(&mut self) { + self.snake_old.iter().for_each(|pos| { + execute!( + stdout(), + MoveTo(1 + pos.1 as u16, 1 + pos.0 as u16), + Print(" ".reset()) + ); + }); + + self.snake.iter().for_each(|pos| { + execute!( + stdout(), + MoveTo(1 + pos.1 as u16, 1 + pos.0 as u16), + Print("S".green()) + ); + }); + + execute!( + stdout(), + MoveTo(1 + self.apple_old.1 as u16, 1 + self.apple_old.0 as u16), + Print(" ".reset()) + ); + execute!( + stdout(), + MoveTo(1 + self.apple_pos.1 as u16, 1 + self.apple_pos.0 as u16), + Print("A".red()) + ); + + execute!( + stdout(), + MoveTo(self.board_size.1 as u16 + 1, self.board_size.0 as u16 + 1) + ); + + self.snake_old = self.snake.clone(); + self.apple_old = self.apple_pos.clone(); + std::thread::sleep(std::time::Duration::from_millis(250)); + } +}