use std::io::prelude::*;
use std::io;
use std::fs::File;
use std::collections::BTreeMap;

use num::*;
use clap::Parser;

#[derive(Parser)]
struct Cli {
    /// The path to the file to read
    #[clap(parse(from_os_str))]
    path: std::path::PathBuf,
}

struct Timestamp{
    file_offset: u64,
    timestamp:   BigInt
}

struct Cursor{
    line: u64,
    col : u64
}

enum Tokens {
    Date,
    End,
    String,
    Version,
    Time,
}

struct Signal {
    name          : String,
    timeline      : BTreeMap<BigInt, BigInt>,
    children_arena: Vec<usize>,
    parent_index  : usize
}

fn main() -> std::io::Result<()> {
    let args = Cli::parse();
    let space = " ".as_bytes()[0];

    let file       = File::open(&args.path)?;
    let mut reader = io::BufReader::new(file);

    let mut buffer = Vec::<u8>::new();
    let mut word_count = 0u64;

    // while {
    //     let bytes_read = reader.read_until(b' ', &mut buffer).unwrap();
    //     bytes_read > 0
    // } {
    //     word_count += 1;

    //     if word_count < 5 {
    //         let string = std::str::from_utf8(&buffer).unwrap();
    //         dbg!(string);
    //     }
    //     buffer.clear();
    // }
    loop {
        buffer.clear();
        let t = reader
            .by_ref()
            .bytes()
            .map(|c| c.unwrap())
            .take_while(|c| 
                c != &b' ' && 
                c != &b'\n');
        buffer.extend(t);
        word_count += 1;
        
    }
    let string = std::str::from_utf8(&buffer).unwrap();
    dbg!(string);
    dbg!(word_count);

    Ok(())
}