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use std::io;
use ratatui::{
layout::{Constraint, Direction, Layout},
style::{Color, Style},
text::{Line, Span},
widgets::{Block, Borders, Paragraph},
Terminal,
prelude::Alignment,
};
pub fn draw(terminal: &mut Terminal<impl ratatui::backend::Backend>, data: &[u8], cursor: usize, filename: &str) -> io::Result<()> {
terminal.draw(|frame| {
let size = frame.size();
let layout = Layout::default()
.direction(Direction::Vertical)
.constraints([Constraint::Min(1), Constraint::Length(1)])
.split(size);
let lines: Vec<Line> = data.chunks(16).enumerate().map(|(i, chunk)| {
let addr = Span::raw(format!("{:08x} │ ", i * 16));
let mut hex: Vec<Span> = Vec::new();
let mut ascii_repr = String::new();
for (j, &byte) in chunk.iter().enumerate() {
let hex_str = format!("{:02x}", byte);
let index = i * 32 + j * 2;
for (k, ch) in hex_str.chars().enumerate() {
let cur_idx = index + k;
let style = if cur_idx == cursor {
Style::default().bg(Color::White).fg(Color::Black)
} else {
Style::default()
};
hex.push(Span::styled(ch.to_string(), style));
}
if j < 15 {
let space = if j % 4 == 3 { " " } else { " " };
hex.push(Span::raw(space));
}
ascii_repr.push(if byte.is_ascii_graphic() || byte == b' ' { byte as char } else { '.' });
}
let missing_bytes = 16 - chunk.len();
let padding = missing_bytes * 3;
let spaces = " ".repeat(padding);
let ascii = Span::raw(format!("{} │ {}", spaces, ascii_repr));
Line::from(vec![addr]
.into_iter()
.chain(hex)
.chain(std::iter::once(ascii))
.collect::<Vec<_>>())
}).collect();
frame.render_widget(Paragraph::new(lines).block(Block::default().borders(Borders::ALL)), layout[0]);
let progress = if data.is_empty() { 100 } else { (cursor / 2 * 100) / data.len() };
let status_text = format!("{} \t 0x{:08x} \t {:3}%", filename, cursor / 2, progress);
let status_bar = Paragraph::new(Line::from(Span::raw(status_text))).alignment(Alignment::Center);
frame.render_widget(status_bar, layout[1]);
})?;
Ok(())
}
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