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pub mod sys;


use {
    std::{
        fmt,
        fs::{
            File,
            OpenOptions,
        },
        io::Read,
        os::unix::{
            fs::{
                OpenOptionsExt,
            },
            io::{
                AsRawFd,
                RawFd,
            },
        },
    },

    anyhow::{
        Context,
        Result,
    },

    nix::{
        ioctl_readwrite,
        ioctl_write_int_bad,
        request_code_none,
    },

    sys::*,
};


pub const EMPTY_MAC: &str = "00:00:00:00:00:00";
const MAC_SIZE: usize = EMPTY_MAC.len();


/// A reference to the network device
#[derive(Debug)]
pub struct NetDevice {
    adapter: u32,
    device: u32,

    file: File,
}


impl AsRawFd for NetDevice {
    #[inline]
    fn as_raw_fd(&self) -> RawFd { self.file.as_raw_fd() }
}


impl NetDevice {
    /// Attempts to open a network device in read-write mode
    pub fn open(adapter: u32, device: u32) -> Result<NetDevice> {
        let path = format!("/dev/dvb/adapter{}/net{}", adapter, device);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .custom_flags(::nix::libc::O_NONBLOCK)
            .open(&path)
            .with_context(|| format!("NET: failed to open device {}", &path))?;

        let net = NetDevice {
            adapter,
            device,
            file,
        };

        Ok(net)
    }

    /// Creates a new network interface and returns interface number
    pub fn add_if(&self, pid: u16, feedtype: u8) -> Result<NetInterface> {
        let mut data = DvbNetIf {
            pid,
            if_num: 0,
            feedtype,
        };

        // NET_ADD_IF
        ioctl_readwrite!(#[inline] ioctl_call, b'o', 52, DvbNetIf);
        unsafe {
            ioctl_call(self.as_raw_fd(), &mut data as *mut _)
        }.context("NET: add if")?;

        Ok(NetInterface {
            net: self,
            if_num: data.if_num,
        })
    }

    /// Removes a network interface
    pub fn remove_if(&self, interface: NetInterface) -> Result<()> {
        // NET_REMOVE_IF
        ioctl_write_int_bad!(#[inline] ioctl_call, request_code_none!(b'o', 53));
        unsafe {
            ioctl_call(self.as_raw_fd(), i32::from(interface.if_num))
        }.context("NET: remove if")?;

        Ok(())
    }
}


pub struct NetInterface<'a> {
    net: &'a NetDevice,
    if_num: u16,
}


impl<'a> fmt::Display for NetInterface<'a> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        if self.net.device == 0 {
            write!(f, "dvb{}_{}", self.net.adapter, self.if_num)
        } else {
            write!(f, "dvb{}{}{}", self.net.adapter, self.net.device, self.if_num)
        }
    }
}


impl<'a> NetInterface<'a> {
    /// Returns interface mac address or empty mac on any error
    pub fn get_mac(&self) -> String {
        let path = format!("/sys/class/net/{}/address", self);
        let file = match File::open(&path) {
            Ok(v) => v,
            _ => return EMPTY_MAC.to_owned(),
        };

        let mut mac = String::with_capacity(MAC_SIZE);
        let result = file
            .take(MAC_SIZE as u64)
            .read_to_string(&mut mac);

        match result {
            Ok(MAC_SIZE) => mac,
            _ => EMPTY_MAC.to_owned(),
        }
    }
}