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//! Network Interface abstraction from commonly used fields for nodes from the
//! linked list provided by system functions like `getifaddrs` and
//! `GetAdaptersAddresses`.
use std::fmt::Debug;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};

/// An alias for an `Option` that wraps either a `Ipv4Addr` or a `Ipv6Addr`
/// representing the IP for a Network Interface netmask
pub type Netmask<T> = Option<T>;

/// A system's network interface
#[derive(Debug, Clone)]
pub struct NetworkInterface {
    /// Interface's name
    pub name: String,
    /// Interface's address
    pub addr: Vec<Addr>,
    /// MAC Address
    pub mac_addr: Option<String>,
    /// Interface's index
    pub index: u32,
}

/// Network interface address
#[derive(Debug, Clone, Copy)]
pub enum Addr {
    /// IPV4 Interface from the AFINET network interface family
    V4(V4IfAddr),
    /// IPV6 Interface from the AFINET6 network interface family
    V6(V6IfAddr),
}

/// IPV4 Interface from the AFINET network interface family
#[derive(Debug, Clone, Copy)]
pub struct V4IfAddr {
    /// The IP address for this network interface
    pub ip: Ipv4Addr,
    /// The broadcast address for this interface
    pub broadcast: Option<Ipv4Addr>,
    /// The netmask for this interface
    pub netmask: Netmask<Ipv4Addr>,
}

/// IPV6 Interface from the AFINET6 network interface family
#[derive(Debug, Clone, Copy)]
pub struct V6IfAddr {
    /// The IP address for this network interface
    pub ip: Ipv6Addr,
    /// The broadcast address for this interface
    pub broadcast: Option<Ipv6Addr>,
    /// The netmask for this interface
    pub netmask: Netmask<Ipv6Addr>,
}

impl NetworkInterface {
    pub fn new_afinet(
        name: &str,
        addr: Ipv4Addr,
        netmask: Netmask<Ipv4Addr>,
        broadcast: Option<Ipv4Addr>,
        index: u32,
    ) -> NetworkInterface {
        let ifaddr_v4 = V4IfAddr {
            ip: addr,
            broadcast,
            netmask,
        };

        NetworkInterface {
            name: name.to_string(),
            addr: vec![Addr::V4(ifaddr_v4)],
            mac_addr: None,
            index,
        }
    }

    pub fn new_afinet6(
        name: &str,
        addr: Ipv6Addr,
        netmask: Netmask<Ipv6Addr>,
        broadcast: Option<Ipv6Addr>,
        index: u32,
    ) -> NetworkInterface {
        let ifaddr_v6 = V6IfAddr {
            ip: addr,
            broadcast,
            netmask,
        };

        NetworkInterface {
            name: name.to_string(),
            addr: vec![Addr::V6(ifaddr_v6)],
            mac_addr: None,
            index,
        }
    }

    pub fn with_mac_addr(self, mac_addr: Option<String>) -> Self {
        Self { mac_addr, ..self }
    }
}

impl Addr {
    pub fn ip(self) -> IpAddr {
        match self {
            Addr::V4(ifaddr_v4) => ifaddr_v4.ip.into(),
            Addr::V6(ifaddr_v6) => ifaddr_v6.ip.into(),
        }
    }

    pub fn broadcast(self) -> Option<IpAddr> {
        match self {
            Addr::V4(ifaddr_v4) => ifaddr_v4.broadcast.map(Into::into),
            Addr::V6(ifaddr_v6) => ifaddr_v6.broadcast.map(Into::into),
        }
    }

    pub fn netmask(self) -> Netmask<IpAddr> {
        match self {
            Addr::V4(ifaddr_v4) => ifaddr_v4.netmask.map(Into::into),
            Addr::V6(ifaddr_v6) => ifaddr_v6.netmask.map(Into::into),
        }
    }
}