use std::io;

use ratatui::{
    buffer::Buffer,
    layout::{Alignment, Rect},
    style::Stylize,
    symbols::border,
    text::Line,
    widgets::{
        block::{Title, Position},
        Block, Paragraph, Widget},
    DefaultTerminal,
    Frame};


fn main() -> io::Result<()> {
    let mut terminal = ratatui::init();
    let app_result = App::default().run(&mut terminal);
    ratatui::restore();
    app_result
}


#[derive(Debug, Default)]
pub struct  App {
    counter: u8,
    exit: bool,
}

impl App {

    // runs application loop till users quits
    pub fn run(&mut self, terminal: &mut DefaultTerminal) -> io::Result<()> {
        while !self.exit {
            terminal.draw(|frame| self.draw(frame))?;
            self.handle_events()?;
        }

        Ok(())
    }

    fn draw(&self, frame: &mut Frame) {
        frame.render_widget(self, frame.area());
    }

    fn handle_events(&mut self) -> io::Result<()> {
        todo!()
    }
}

impl Widget for &App {
    fn render(self, area: Rect, buf: &mut Buffer) {
        let title = Title::from(" Counter App Tutorial ".bold());
        let instructions = Title::from(Line::from(vec![
            " Decrement ".into(),
            "<Left>".blue().bold(),
            " Increment ".into(),
            "<Right>".blue().bold(),
            " Quit ".into(),
            "<Q> ".blue().bold(),
        ]));
        let block = Block::bordered()
            .title(title.alignment(Alignment::Center))
            .title(instructions
                .alignment(Alignment::Center)
                .position(Position::Bottom),
            )
            .border_set(border::THICK);

        let counter_text = Text::from(vec![Line::from(vec![
            "Value: ".into(),
                self.counter.to_string().yellow(),
        ])]);

        Paragraph::new(counter_text)
            .centered()
            .block(block)
            .render(area, buf);
    }
}