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use crossterm::{
cursor::{Hide, Show},
event::{Event, KeyCode, KeyEvent},
execute,
terminal::{self, EnterAlternateScreen, LeaveAlternateScreen},
};
use rand::prelude::*;
use std::io::{self, Write};
use std::time::{Duration, Instant};
use tui::{
backend::CrosstermBackend,
layout::{Alignment, Constraint, Direction, Layout},
style::{Color, Style},
widgets::{Block, Borders, Paragraph},
Terminal,
};
const PARAGRAPHS: [&str; 3] = [
"The quick brown fox jumps over the lazy dog.",
"In the beginning God created the heavens and the earth.",
"To be, or not to be, that is the question:",
];
struct GameState {
paragraph: String,
user_input: String,
start_time: Instant,
end_time: Option<Instant>,
current_index: usize,
}
enum AppState {
Playing(GameState),
Stats(f64, u64),
Quit,
}
impl GameState {
fn new() -> GameState {
let paragraph = PARAGRAPHS.choose(&mut thread_rng()).unwrap().to_string();
GameState {
paragraph,
user_input: String::new(),
start_time: Instant::now(),
end_time: None,
current_index: 0,
}
}
fn input(&mut self, c: char) {
if self.current_index < self.paragraph.len() {
self.user_input.push(c);
self.current_index += 1;
}
}
fn check_end_condition(&mut self) -> bool {
if self.current_index == self.paragraph.len() {
self.end_time = Some(Instant::now());
return true;
}
false
}
fn reset(&mut self) {
self.user_input.clear();
self.start_time = Instant::now();
self.end_time = None;
self.current_index = 0;
}
fn handle_input(&mut self, c: char) {
if !c.is_control() {
if self.current_index < self.paragraph.len() {
if self.paragraph.chars().nth(self.current_index).unwrap() != c {
// Incorrect character
}
self.input(c);
}
}
}
fn wpm(&self) -> f64 {
let elapsed_time = self.elapsed_time().as_secs_f64() / 60.0;
let cpm = (self.user_input.len()) as f64 / elapsed_time;
cpm / 5.0
}
fn accuracy(&self) -> f64 {
let total_chars = self.user_input.len();
let correct_chars = self
.user_input
.chars()
.zip(self.paragraph.chars())
.filter(|&(a, b)| a == b)
.count();
(correct_chars as f64 / total_chars as f64) * 100.0
}
fn elapsed_time(&self) -> Duration {
match self.end_time {
Some(end) => end - self.start_time,
None => self.start_time.elapsed(),
}
}
fn render_widgets(
&self,
terminal: &mut Terminal<CrosstermBackend<impl Write>>,
) -> Result<(), io::Error> {
terminal.draw(|mut f| {
let size = f.size();
let chunks = Layout::default()
.direction(Direction::Vertical)
.margin(5)
.constraints(
[
Constraint::Percentage(10),
Constraint::Percentage(10),
Constraint::Percentage(80),
]
.as_ref(),
)
.split(size);
// Title
let title = "Typerpunk";
let title_widget = Paragraph::new(title)
.style(Style::default().fg(Color::White))
.alignment(Alignment::Center)
.block(Block::default().borders(Borders::ALL));
// Stats
let stats_text = format!(
"WPM: {:.1} | Accuracy: {:.1}% | Time: {:.0}s",
self.wpm(),
self.accuracy(),
self.elapsed_time().as_secs()
);
let stats_widget = Paragraph::new(stats_text)
.style(Style::default().fg(Color::White))
.alignment(Alignment::Center)
.block(Block::default().borders(Borders::ALL));
// Paragraph
let paragraph_text = format!(
"{}\n{}",
self.paragraph,
self.user_input
.chars()
.map(|c| if c.is_whitespace() { ' ' } else { '_' })
.collect::<String>()
);
let paragraph_widget = Paragraph::new(paragraph_text)
.style(Style::default().fg(Color::White))
.alignment(Alignment::Center)
.block(Block::default().borders(Borders::ALL));
f.render_widget(title_widget, chunks[0]);
f.render_widget(stats_widget, chunks[1]);
f.render_widget(paragraph_widget, chunks[2]);
})?;
Ok(())
}
}
fn main() -> Result<(), io::Error> {
let stdout = io::stdout();
let backend = CrosstermBackend::new(stdout);
let mut terminal = Terminal::new(backend)?;
execute!(terminal.backend_mut(), EnterAlternateScreen, Hide)?;
let mut app_state = AppState::Playing(GameState::new());
let mut rng = thread_rng();
loop {
match app_state {
AppState::Playing(ref mut state) => {
state.render_widgets(&mut terminal)?;
if let Ok(event) = crossterm::event::read() {
match event {
Event::Key(KeyEvent {
code: KeyCode::Char(c),
..
}) => {
state.handle_input(c);
if state.check_end_condition() {
app_state = AppState::Stats(state.wpm(), state.accuracy() as u64);
}
}
Event::Key(KeyEvent {
code: KeyCode::Enter,
..
}) => {
state.reset();
}
Event::Key(KeyEvent {
code: KeyCode::Esc, ..
}) => {
app_state = AppState::Quit;
}
_ => {}
}
}
}
AppState::Stats(wpm, accuracy) => {
let stats_text = format!("Your WPM is {:.1} with {:.1}% accuracy!", wpm, accuracy);
let stats_widget = Paragraph::new(stats_text)
.style(Style::default().fg(Color::White))
.alignment(Alignment::Center)
.block(Block::default().borders(Borders::ALL));
terminal.draw(|f| {
let size = f.size();
f.render_widget(stats_widget, size);
})?;
std::thread::sleep(rng.gen_range(Duration::from_secs(2)..Duration::from_secs(4)));
app_state = AppState::Playing(GameState::new());
}
AppState::Quit => {
break;
}
}
}
execute!(terminal.backend_mut(), LeaveAlternateScreen, Show)?;
Ok(())
}
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