#![warn(clippy::pedantic, clippy::style, clippy::nursery)]
#![allow(clippy::question_mark_used)]

use chrono::SubsecRound;
use ratatui::crossterm::event::{
    self, poll, DisableMouseCapture, EnableMouseCapture, Event, KeyCode, KeyModifiers,
};
use ratatui::layout::Alignment;
use ratatui::widgets::{Block, Padding};
use ratatui::{
    backend::CrosstermBackend,
    crossterm::{
        execute,
        terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
    },
    layout::{Constraint, Direction, Layout, Rect},
    style::{Style, Stylize},
    widgets::Paragraph,
    Terminal,
};
use std::{io, time::Duration};

fn main() -> Result<(), io::Error> {
    // setup terminal
    enable_raw_mode()?;
    let mut stdout = io::stdout();
    execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
    let backend = CrosstermBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;

    loop {
        let raw_time = chrono::Local::now().round_subsecs(0);
        let splits: Vec<String> = raw_time
            .naive_local()
            .to_string()
            .split_whitespace()
            .map(str::to_string)
            .collect();
        let fdate: String = splits[0].clone();
        let ftime: String = splits[1].clone();
        terminal.draw(|frame| {
            let root = frame.size();
            let space = Block::bordered()
                .padding(Padding::new(
                    root.width / 8,
                    root.width / 8,
                    root.height / 8,
                    root.height / 8,
                ))
                .title(env!("CARGO_PKG_NAME"))
                .title_bottom(env!("CARGO_PKG_VERSION"))
                .title_alignment(Alignment::Center)
                .title_style(Style::new().bold());
            let a = space.inner(root);
            let parts = partition(a);
            let timew = tui_big_text::BigText::builder()
                .style(Style::new().red())
                .lines(vec![ftime.into()])
                .alignment(Alignment::Center)
                .build()
                .expect("could not render time widget");
            let datew = Paragraph::new(fdate)
                .blue()
                .alignment(Alignment::Left)
                .block(Block::new().padding(Padding::new(
                    parts.0.left(),
                    parts.0.right() / 3,
                    0,
                    0,
                )));
            frame.render_widget(space, root);
            frame.render_widget(timew, parts.1);
            frame.render_widget(datew, parts.0);
        })?;
        if poll(Duration::from_millis(100))? {
            if let Event::Key(key) = event::read()? {
                if key.code == KeyCode::Char('q')
                    || key.code == KeyCode::Esc
                    || (key.modifiers.contains(KeyModifiers::CONTROL)
                        && key.code == KeyCode::Char('c'))
                {
                    break;
                }
            }
        }
    }

    // restore terminal
    disable_raw_mode()?;
    execute!(
        terminal.backend_mut(),
        LeaveAlternateScreen,
        DisableMouseCapture
    )?;
    terminal.show_cursor()?;

    Ok(())
}

fn partition(r: Rect) -> (Rect, Rect) {
    let part = Layout::default()
        .direction(Direction::Vertical)
        .constraints([Constraint::Percentage(13), Constraint::Min(0)])
        .split(r);

    (part[0], part[1])
}