//  Copyright 2020, The Tari Project
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use std::net::SocketAddr;

use super::error::DnsResolverError;
use crate::multiaddr::{Multiaddr, Protocol};

pub fn is_dns4_addr(addr: &Multiaddr) -> bool {
    let proto = addr.iter().next();
    matches!(proto, Some(Protocol::Dns4(_))) || matches!(proto, Some(Protocol::Dns(_)))
}

pub fn convert_tcpip_multiaddr_to_socketaddr(addr: &Multiaddr) -> Result<SocketAddr, DnsResolverError> {
    match extract_protocols(addr)? {
        (Protocol::Ip4(host), Protocol::Tcp(port)) => Ok((host, port).into()),
        (Protocol::Ip6(host), Protocol::Tcp(port)) => Ok((host, port).into()),
        _ => Err(DnsResolverError::ExpectedTcpIpAddress(addr.clone())),
    }
}

pub fn extract_protocols(addr: &Multiaddr) -> Result<(Protocol<'_>, Protocol<'_>), DnsResolverError> {
    let mut addr_iter = addr.iter();
    let proto1 = addr_iter.next().ok_or(DnsResolverError::EmptyAddress)?;
    let proto2 = addr_iter.next().ok_or_else(|| DnsResolverError::InvalidAddress {
        address: addr.clone(),
        message: "Address does not consist of at least 2 parts".into(),
    })?;

    Ok((proto1, proto2))
}
