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use get_if_addrs::{self, IfAddr};
use priv_prelude::*;

/// Some helpful additional methods for `IpvAddr`.
pub trait IpAddrExt {
    /// Check whether an IP address is global.
    fn is_global(&self) -> bool;

    /// Check whether an IP address belongs to a private subnet.
    fn is_private(&self) -> bool;

    /// If the IP address is an unspecified address (eg. `0.0.0.0`), then it is expanded into a
    /// vector with a seperate IP address for each network interface.
    fn expand_local_unspecified(&self) -> io::Result<Vec<IpAddr>>;

    /// If this is the unspecified address then map it to the localhost address.
    fn unspecified_to_localhost(&self) -> IpAddr;
}

impl IpAddrExt for IpAddr {
    fn is_global(&self) -> bool {
        match *self {
            IpAddr::V4(ref ip) => Ipv4AddrExt::is_global(ip),
            IpAddr::V6(ref ip) => Ipv6AddrExt::is_global(ip),
        }
    }

    fn is_private(&self) -> bool {
        match *self {
            //IpAddr::V4(ref ip) => Ipv4AddrExt::is_private(ip),
            IpAddr::V4(ref ip) => ip.is_private(),
            IpAddr::V6(_) => false,
        }
    }

    fn expand_local_unspecified(&self) -> io::Result<Vec<IpAddr>> {
        let ret = match *self {
            IpAddr::V4(v4_addr) => v4_addr
                .expand_local_unspecified()?
                .into_iter()
                .map(IpAddr::V4)
                .collect(),
            IpAddr::V6(v6_addr) => v6_addr
                .expand_local_unspecified()?
                .into_iter()
                .map(IpAddr::V6)
                .collect(),
        };
        Ok(ret)
    }

    fn unspecified_to_localhost(&self) -> IpAddr {
        match *self {
            IpAddr::V4(ref ip) => IpAddr::V4(ip.unspecified_to_localhost()),
            IpAddr::V6(ref ip) => IpAddr::V6(ip.unspecified_to_localhost()),
        }
    }
}

/// Some helpful additional methods for `Ipv4Addr`.
pub trait Ipv4AddrExt {
    /// Check whether an IP address is global.
    fn is_global(&self) -> bool;

    /// If the IP address is the unspecified address `0.0.0.0`, then it is expanded into a vector
    /// with a seperate IP address for each network interface.
    fn expand_local_unspecified(&self) -> io::Result<Vec<Ipv4Addr>>;

    /// Convert the unspecified address 0.0.0.0 to 127.0.0.1
    fn unspecified_to_localhost(&self) -> Ipv4Addr;
}

/// Some helpful additional methods for `Ipv6Addr`.
pub trait Ipv6AddrExt {
    /// Check whether an IP address is global.
    fn is_global(&self) -> bool;

    /// If the IP address is the unspecified address `::`, then it is expanded into a vector with a
    /// seperate IP address for each network interface.
    fn expand_local_unspecified(&self) -> io::Result<Vec<Ipv6Addr>>;

    /// Convert the unspecified address :: to ::1
    fn unspecified_to_localhost(&self) -> Ipv6Addr;
}

impl Ipv4AddrExt for Ipv4Addr {
    fn is_global(&self) -> bool {
        !self.is_private()
            && !self.is_loopback()
            && !self.is_link_local()
            && !self.is_broadcast()
            && !self.is_documentation()
            && !self.is_unspecified()
    }

    fn expand_local_unspecified(&self) -> io::Result<Vec<Ipv4Addr>> {
        if !self.is_unspecified() {
            return Ok(vec![*self]);
        }

        let mut ret = Vec::new();
        let ifs = get_if_addrs::get_if_addrs()?;
        for interface in ifs {
            if let IfAddr::V4(v4_addr) = interface.addr {
                ret.push(v4_addr.ip);
            }
        }
        Ok(ret)
    }

    fn unspecified_to_localhost(&self) -> Ipv4Addr {
        if self.is_unspecified() {
            ipv4!("127.0.0.1")
        } else {
            *self
        }
    }
}

impl Ipv6AddrExt for Ipv6Addr {
    fn is_global(&self) -> bool {
        // TODO: this is very incomplete
        !self.is_loopback() && !self.is_unspecified()
    }

    fn expand_local_unspecified(&self) -> io::Result<Vec<Ipv6Addr>> {
        if !self.is_unspecified() {
            return Ok(vec![*self]);
        }

        let mut ret = Vec::new();
        let ifs = get_if_addrs::get_if_addrs()?;
        for interface in ifs {
            if let IfAddr::V6(v6_addr) = interface.addr {
                ret.push(v6_addr.ip);
            }
        }
        Ok(ret)
    }

    fn unspecified_to_localhost(&self) -> Ipv6Addr {
        if self.is_unspecified() {
            ipv6!("::1")
        } else {
            *self
        }
    }
}