use std::fs::File;
use std::io;
use std::io::BufReader;
use std::usize::MAX;

mod colormap;

mod tohex;
use tohex::hexdump;
mod tobin;
use tobin::revert_hexdump;

use clap::Parser;

#[derive(Parser)]
#[command(version, about = "A simple hexdump tool")]
struct Arguments {
    /// Stop after <len> octets
    #[arg(short, long)]
    length: Option<usize>,

    /// Revert hexdump to binary
    #[arg(short, long)]
    revert: bool,

    /// Filename to read, if left out read from stdin
    filename: Option<String>,
}

pub fn isatty() -> bool {
    termion::is_tty(&File::create("/dev/stdout").expect("Could not open `stdout'"))
}

fn main() {
    let args = Arguments::parse();
    let length = if args.length.is_some() {
        args.length.unwrap()
    } else {
        MAX
    };

    if !args.revert {
        let reader: Box<dyn io::Read> = if args.filename.is_none() {
            Box::new(io::stdin())
        } else {
            let filename = args.filename.unwrap();
            Box::new(File::open(filename).expect("Could not open file."))
        };
        hexdump(reader, length);
    } else {
        let reader: Box<dyn io::BufRead> = if args.filename.is_none() {
            Box::new(io::stdin().lock())
        } else {
            let filename = args.filename.unwrap();
            Box::new(BufReader::new(File::open(filename).expect("Could not open file.")))
        };
        revert_hexdump(reader);
    }
}