use std::{env::{self}, io::Error, path::Path};
use std::fs;

pub mod headparse; // The HEAder parsing 

/// Use for handling possible formats of the WFDB data
#[derive(Debug, Clone, Copy)]
enum SignalFormat {
    Format16 = 16,
    Format212 = 212,
    Unimpl = 0
}

fn main() -> Result<(), Error>{
    let args: Vec<String> = env::args().collect();

    if args.len() <= 1 || args.contains(&"help".to_string()) {
        help();
        return Ok(());
    }

    let filepath = Path::new(&args[1]);
    if !filepath.is_file() {
        println!("Path argument provided is not a valid file");
        return Ok(());
    }
    if filepath.extension().unwrap() != "hea" {
        println!("File provided is not a .hea file");
        return Ok(());
    }

    let hea_file_result = fs::read_to_string(filepath);
    match hea_file_result {
        Ok(file_data) => {
            let header = headparse::parse_header(file_data.as_str());
            dbg!(header);
        }
        Err(e) => return Err(e)
    }
    println!("Hello, world!");
    Ok(())
}

fn help() {
    println!("Conversion of WFDB files to a more human readable format. By default to a CSV.");
    println!("\nUse in the format \"wfdb_corrosion (.hea filename)\"")
}