use ratatui::{text::ToSpan, widgets::{block::BlockExt, Block, Widget}};

use crate::lua::iobuffer::iobuffer;


pub struct LogView<'a> {
    block: Option<Block<'a>>
}

impl<'a> LogView<'a> {
    pub fn new() -> Self {
        Self { block: None }
    }

    pub fn block(mut self, block: Block<'a>) -> Self {
        self.block = Some(block);
        self
    }
}

impl Widget for &mut LogView<'_> {
    fn render(self, area: ratatui::prelude::Rect, buf: &mut ratatui::prelude::Buffer)
    where
        Self: Sized {
        self.block.render(area, buf);
        let inner_area = self.block.inner_if_some(area);

        let lines = {
            let buffer = iobuffer().read().unwrap();
            buffer.get()
        };

        let mut line_area = inner_area.clone();
        line_area.height = 1;
        line_area.y = inner_area.y + inner_area.height - 1;

        for line in lines.lines().rev() {
            let line = line.to_span();
            line.render(line_area, buf);

            line_area.y -= 1;

            if !inner_area.contains(line_area.into()) {
                break;
            }
        }
    }
}