use std::{fs, io};
use std::net::IpAddr;
use std::path::Path;
use if_addrs::{get_if_addrs, IfAddr, Interface};

fn print_single_interface<P: AsRef<Path>>(iface: Interface, port: &u16, path: P) -> io::Result<()> {
    for entry in fs::read_dir(path)? {
        let entry = entry?;
        let entry_path = entry.path();
        if entry_path.is_dir() { continue }

        let filename = entry_path.file_name().unwrap();

        if let IfAddr::V4(_) = iface.addr {
            println!("http://{}:{}/{}", iface.ip(), port, filename.to_str().unwrap());
        }
    }

    Ok(())
}

fn is_last_octet_one(ip: IpAddr) -> bool {
    match ip {
        IpAddr::V4(addr) => addr.octets()[3] == 1,
        _ => false
    }
}

pub fn print_interface<P: AsRef<Path>>(iface_str: &str, port: &u16, path: P) {
    for iface in get_if_addrs().unwrap() {
        if iface_str == "all" {
            if iface.is_loopback() || is_last_octet_one(iface.ip()) {
                continue
            }
        } else {
            if iface_str != iface.name { continue }
        }

        print_single_interface(iface, port, &path).unwrap();
    }
}