use std::io::Write;
use std::path::PathBuf;

use anyhow::{bail, Result};

use crate::archive::ArchiveReader;

pub fn run(archive: PathBuf, path: String) -> Result<()> {
    let reader = ArchiveReader::new_auto()?;
    reader.open_filename(&archive, 10240)?;

    let needle = path.trim_end_matches('/');

    while let Some(entry) = reader.next_header()? {
        if let Some(pathname) = entry.pathname() {
            let entry_name = pathname.trim_end_matches('/');
            if entry_name == needle || pathname == path {
                let mut stdout = std::io::stdout().lock();
                let mut buf = [0u8; 16384];
                loop {
                    let n = reader.read_data(&mut buf)?;
                    if n == 0 {
                        break;
                    }
                    stdout.write_all(&buf[..n])?;
                }
                stdout.flush()?;
                return Ok(());
            }
        }
    }

    bail!("entry not found: {path}");
}