use crate::app::App;
use ratatui::{
    Frame,
    style::Stylize,
    symbols::border,
    text::{Line, Text},
    widgets::{Block, Paragraph, Widget},
};

pub fn draw(frame: &mut Frame, app: &App) {
    let rect = draw_layout(app);
    frame.render_widget(rect, frame.area());
}

fn draw_layout(app: &App) -> impl Widget {
    let title = Line::from(" Counter App Tutorial ".bold());
    let instructions = Line::from(vec![
        " Decrement ".into(),
        "<Left>".blue().bold(),
        " Increment ".into(),
        "<Right>".blue().bold(),
        " Quit ".into(),
        "<Q> ".blue().bold(),
    ]);
    let block = Block::bordered()
        .title(title.centered())
        .title_bottom(instructions.centered())
        .border_set(border::THICK);

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

    Paragraph::new(counter_text).centered().block(block)
}

#[cfg(test)]
mod tests {

    use super::*;
    use ratatui::{buffer::Buffer, layout::Rect, style::Style};

    #[test]
    fn render_success() {
        let mut app = App::default();
        assert!(app.init_context().is_ok());

        let rect = Rect::new(0, 0, 50, 4);
        let mut buf = Buffer::empty(rect);

        let res = draw_layout(&app);
        res.render(rect, &mut buf);

        let mut expected = Buffer::with_lines(vec![
            "┏━━━━━━━━━━━━━ Counter App Tutorial ━━━━━━━━━━━━━┓",
            "┃                    Value: 0                    ┃",
            "┃                                                ┃",
            "┗━ Decrement <Left> Increment <Right> Quit <Q> ━━┛",
        ]);
        let title_style = Style::new().bold();
        let counter_style = Style::new().yellow();
        let key_style = Style::new().blue().bold();

        expected.set_style(Rect::new(14, 0, 22, 1), title_style);
        expected.set_style(Rect::new(28, 1, 1, 1), counter_style);
        expected.set_style(Rect::new(13, 3, 6, 1), key_style);
        expected.set_style(Rect::new(30, 3, 7, 1), key_style);
        expected.set_style(Rect::new(43, 3, 4, 1), key_style);

        assert_eq!(buf, expected);
    }
}