extern crate failure;
extern crate termion;
extern crate tui;

#[allow(dead_code)]
mod util;

use std::io;

use termion::event::Key;
use termion::input::MouseTerminal;
use termion::raw::IntoRawMode;
use termion::screen::AlternateScreen;
use tui::backend::TermionBackend;
use tui::layout::{Constraint, Direction, Layout, Rect};
use tui::style::{Color, Modifier, Style};
use tui::widgets::{BarChart, Block, Borders, Widget};
use tui::Terminal;

use util::event::{Event, Events};

struct App<'a> {
    size: Rect,
    data: Vec<(&'a str, u64)>,
}

impl<'a> App<'a> {
    fn new() -> App<'a> {
        App {
            size: Rect::default(),
            data: vec![
                ("B1", 9),
                ("B2", 12),
                ("B3", 5),
                ("B4", 8),
                ("B5", 2),
                ("B6", 4),
                ("B7", 5),
                ("B8", 9),
                ("B9", 14),
                ("B10", 15),
                ("B11", 1),
                ("B12", 0),
                ("B13", 4),
                ("B14", 6),
                ("B15", 4),
                ("B16", 6),
                ("B17", 4),
                ("B18", 7),
                ("B19", 13),
                ("B20", 8),
                ("B21", 11),
                ("B22", 9),
                ("B23", 3),
                ("B24", 5),
            ],
        }
    }

    fn update(&mut self) {
        let value = self.data.pop().unwrap();
        self.data.insert(0, value);
    }
}

fn main() -> Result<(), failure::Error> {
    // Terminal initialization
    let stdout = io::stdout().into_raw_mode()?;
    let stdout = MouseTerminal::from(stdout);
    let stdout = AlternateScreen::from(stdout);
    let backend = TermionBackend::new(stdout);
    let mut terminal = Terminal::new(backend)?;
    terminal.hide_cursor()?;

    // Setup event handlers
    let events = Events::new();

    // App
    let mut app = App::new();

    loop {
        let size = terminal.size()?;
        if app.size != size {
            terminal.resize(size)?;
            app.size = size;
        }
        terminal.draw(|mut f| {
            let chunks = Layout::default()
                .direction(Direction::Vertical)
                .margin(2)
                .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
                .split(app.size);
            BarChart::default()
                .block(Block::default().title("Data1").borders(Borders::ALL))
                .data(&app.data)
                .bar_width(9)
                .style(Style::default().fg(Color::Yellow))
                .value_style(Style::default().fg(Color::Black).bg(Color::Yellow))
                .render(&mut f, chunks[0]);
            {
                let chunks = Layout::default()
                    .direction(Direction::Horizontal)
                    .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
                    .split(chunks[1]);
                BarChart::default()
                    .block(Block::default().title("Data2").borders(Borders::ALL))
                    .data(&app.data)
                    .bar_width(5)
                    .bar_gap(3)
                    .style(Style::default().fg(Color::Green))
                    .value_style(Style::default().bg(Color::Green).modifier(Modifier::Bold))
                    .render(&mut f, chunks[0]);
                BarChart::default()
                    .block(Block::default().title("Data3").borders(Borders::ALL))
                    .data(&app.data)
                    .style(Style::default().fg(Color::Red))
                    .bar_width(7)
                    .bar_gap(0)
                    .value_style(Style::default().bg(Color::Red))
                    .label_style(Style::default().fg(Color::Cyan).modifier(Modifier::Italic))
                    .render(&mut f, chunks[1]);
            }
        })?;

        match events.next()? {
            Event::Input(input) => if input == Key::Char('q') {
                break;
            },
            Event::Tick => {
                app.update();
            }
        }
    }

    terminal.show_cursor()?;
    Ok(())
}