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use nom::character::{is_alphanumeric, is_digit};
use serde::{Deserialize, Serialize};

use std::{fmt, net::Ipv4Addr};

use crate::parse::{parse_ip_address, parse_u16, slice_to_string};

/// Domain address for a URI.
#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
pub enum Domain {
    Ipv4(Ipv4Addr, Option<u16>),
    Domain(String, Option<u16>),
}

impl fmt::Display for Domain {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Domain::Ipv4(addr, port) => {
                if let Some(port) = port {
                    write!(f, "{}:{}", addr, port)
                } else {
                    write!(f, "{}", addr)
                }
            },
            Domain::Domain(domain, port) => {
                if let Some(port) = port {
                    write!(f, "{}:{}", domain, port)
                } else {
                    write!(f, "{}", domain)
                }
            },
        }
    }
}

named!(pub parse_domain<Domain>, do_parse!(
    out: alt!(parse_ip_domain | parse_domain_domain) >>
    (out)
));

named!(pub parse_ip_domain<Domain>, do_parse!(
    addr: parse_ip_address >>
    opt!(char!(':')) >>
    port: opt!(map_res!(take_while!(is_digit), parse_u16)) >>
    (Domain::Ipv4(addr, port))
));

named!(pub parse_domain_domain<Domain>, do_parse!(
    domain: map_res!(take_while!(|item| is_alphanumeric(item) || item == b'.'), slice_to_string) >>
    opt!(char!(':')) >>
    port: opt!(map_res!(take_while!(is_digit), parse_u16)) >>
    (Domain::Domain(domain, port))
));