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use nom::{IResult, Needed, Err};
use nom::combinator::rest;
use nom::number::streaming::{be_u8, be_u32};
use std::net::Ipv4Addr;

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct RadiusAttributeType(pub u8);

#[allow(non_upper_case_globals)]
impl RadiusAttributeType {
    pub const UserName          : RadiusAttributeType = RadiusAttributeType(1);
    pub const UserPassword      : RadiusAttributeType = RadiusAttributeType(2);
    pub const ChapPassword      : RadiusAttributeType = RadiusAttributeType(3);
    pub const NasIPAddress      : RadiusAttributeType = RadiusAttributeType(4);
    pub const NasPort           : RadiusAttributeType = RadiusAttributeType(5);
    pub const ServiceType       : RadiusAttributeType = RadiusAttributeType(6);
    pub const FramedProtocol    : RadiusAttributeType = RadiusAttributeType(7);
    pub const FramedIPAddress   : RadiusAttributeType = RadiusAttributeType(8);
    pub const FramedIPNetmask   : RadiusAttributeType = RadiusAttributeType(9);
    pub const FramedRouting     : RadiusAttributeType = RadiusAttributeType(10);
    pub const FilterId          : RadiusAttributeType = RadiusAttributeType(11);
    pub const FramedMTU         : RadiusAttributeType = RadiusAttributeType(12);
    pub const FramedCompression : RadiusAttributeType = RadiusAttributeType(13);
    pub const VendorSpecific    : RadiusAttributeType = RadiusAttributeType(26);
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct ServiceType(pub u32);

#[allow(non_upper_case_globals)]
impl ServiceType {
    pub const Login                  : ServiceType = ServiceType(1);
    pub const Framed                 : ServiceType = ServiceType(2);
    pub const CallbackLogin          : ServiceType = ServiceType(3);
    pub const CallbackFramed         : ServiceType = ServiceType(4);
    pub const Outbound               : ServiceType = ServiceType(5);
    pub const Administrative         : ServiceType = ServiceType(6);
    pub const NasPrompt              : ServiceType = ServiceType(7);
    pub const AuthenticateOnly       : ServiceType = ServiceType(8);
    pub const CallbackNasPrompt      : ServiceType = ServiceType(9);
    pub const CallCheck              : ServiceType = ServiceType(10);
    pub const CallbackAdministrative : ServiceType = ServiceType(11);
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct FramedRouting(pub u32);

#[allow(non_upper_case_globals)]
impl FramedRouting {
    pub const None        : FramedRouting = FramedRouting(0);
    pub const Send        : FramedRouting = FramedRouting(1);
    pub const Receive     : FramedRouting = FramedRouting(2);
    pub const SendReceive : FramedRouting = FramedRouting(3);
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct FramedProtocol(pub u32);

#[allow(non_upper_case_globals)]
impl FramedProtocol {
    pub const Ppp      : FramedProtocol = FramedProtocol(1);
    pub const Slip     : FramedProtocol = FramedProtocol(2);
    /// AppleTalk Remote Access Protocol
    pub const Arap     : FramedProtocol = FramedProtocol(3);
    /// Gandalf proprietary SingleLink/MultiLink protocol
    pub const Gandalf  : FramedProtocol = FramedProtocol(4);
    /// Xylogics proprietary IPX/SLIP
    pub const Xylogics : FramedProtocol = FramedProtocol(5);
    /// X.75 Synchronous
    pub const X75      : FramedProtocol = FramedProtocol(6);
}

/// This Attribute indicates a compression protocol to be used for the
/// link.  It MAY be used in Access-Accept packets.  It MAY be used in
/// an Access-Request packet as a hint to the server that the NAS
/// would prefer to use that compression, but the server is not
/// required to honor the hint.
///
/// More than one compression protocol Attribute MAY be sent.  It is
/// the responsibility of the NAS to apply the proper compression
/// protocol to appropriate link traffic.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct FramedCompression(pub u32);

#[allow(non_upper_case_globals)]
impl FramedCompression {
    /// No compression
    pub const None      : FramedCompression = FramedCompression(0);
    /// VJ TCP/IP header compression (See RFC1144)
    pub const TcpIp     : FramedCompression = FramedCompression(1);
    /// IPX header compression
    pub const Ipx       : FramedCompression = FramedCompression(2);
    /// Stac-LZS compression
    pub const StaticLzs : FramedCompression = FramedCompression(3);
}

#[derive(Clone, Debug, PartialEq)]
pub enum RadiusAttribute<'a> {
    UserName(&'a [u8]),
    UserPassword(&'a [u8]),
    ChapPassword(u8, &'a [u8]),
    NasIPAddress(Ipv4Addr),
    NasPort(u32),
    ServiceType(ServiceType),
    FramedProtocol(FramedProtocol),
    FramedIPAddress(Ipv4Addr),
    FramedIPNetmask(Ipv4Addr),
    FramedRouting(FramedRouting),
    FilterId(&'a [u8]),
    FramedMTU(u32),
    FramedCompression(FramedCompression),
    VendorSpecific(u32, &'a [u8]),
    CalledStationId(&'a [u8]),
    CallingStationId(&'a [u8]),

    Unknown(u8, &'a [u8]),
}

fn parse_attribute_content(i: &[u8], t: u8) -> IResult<&[u8], RadiusAttribute> {
    match t {
        1 => value!(i, RadiusAttribute::UserName(i)),
        2 => value!(i, RadiusAttribute::UserPassword(i)),
        3 => {
            if i.len() < 2 {
                return Err(Err::Incomplete(Needed::Size(2)))
            }
            value!(i, RadiusAttribute::ChapPassword(i[0], &i[1..]))
        }
        4 => map!{i, take!(4), |v:&[u8]| RadiusAttribute::NasIPAddress(Ipv4Addr::new(v[0],v[1],v[2],v[3]))},
        5 => map!{i, be_u32, |v| RadiusAttribute::NasPort(v)},
        6 => map!{i, be_u32, |v| RadiusAttribute::ServiceType(ServiceType(v))},
        7 => map!{i, be_u32, |v| RadiusAttribute::FramedProtocol(FramedProtocol(v))},
        8 => map!{i, take!(4), |v:&[u8]| RadiusAttribute::FramedIPAddress(Ipv4Addr::new(v[0],v[1],v[2],v[3]))},
        9 => map!{i, take!(4), |v:&[u8]| RadiusAttribute::FramedIPNetmask(Ipv4Addr::new(v[0],v[1],v[2],v[3]))},
        10 => map!{i, be_u32, |v| RadiusAttribute::FramedRouting(FramedRouting(v))},
        11 => value!(i, RadiusAttribute::FilterId(i)),
        12 => map!(i, be_u32, |v| RadiusAttribute::FramedMTU(v)),
        13 => map!{i, be_u32, |v| RadiusAttribute::FramedCompression(FramedCompression(v))},
        26 => {
            if i.len() < 5 {
                return Err(Err::Incomplete(Needed::Size(5)))
            }
            do_parse!{i,
                      vendorid:   be_u32 >>
                      vendordata: rest >>
                      ( RadiusAttribute::VendorSpecific(vendorid,vendordata) )
            }
        }
        30 => value!(i, RadiusAttribute::CalledStationId(i)),
        31 => value!(i, RadiusAttribute::CallingStationId(i)),
        _ => value!(i, RadiusAttribute::Unknown(t, i)),
    }
}

pub fn parse_radius_attribute(i: &[u8]) -> IResult<&[u8], RadiusAttribute> {
    do_parse!{i,
        t: be_u8 >>
        l: verify!(be_u8, |val:&u8| *val >= 2) >>
        v: flat_map!(take!(l-2),call!(parse_attribute_content,t)) >>
        ( v )
    }
}

#[cfg(test)]
mod tests {
    use crate::radius_attr::*;
    use nom::{Err, error::ErrorKind};

    #[test]
    fn test_attribute_invalid() {
        let data = &[255, 0, 2, 2];
        assert_eq!(
            parse_radius_attribute(data),
            Err(Err::Error(error_position!(&data[1..], ErrorKind::Verify)))
        );
    }

    #[test]
    fn test_attribute_empty() {
        let data = &[255, 2, 2, 2];
        assert_eq!(
            parse_radius_attribute(data),
            Ok((&data[2..], RadiusAttribute::Unknown(255, &[])))
        );
    }

    #[test]
    fn test_attribute() {
        let data = &[255, 4, 2, 2];
        assert_eq!(
            parse_radius_attribute(data),
            Ok((&b""[..], RadiusAttribute::Unknown(255, &[2, 2])))
        );
    }

    #[test]
    fn test_parse_vendor_specific() {
        {
            let data = &[26, 7, 0, 1, 2, 3, 120];
            assert_eq!(
                parse_radius_attribute(data),
                Ok((
                    &b""[..],
                    RadiusAttribute::VendorSpecific(66051, "x".as_bytes())
                ))
            )
        }
        {
            let data = &[26, 6, 0, 1, 2, 3];
            assert_eq!(
                parse_radius_attribute(data),
                Err(Err::Incomplete(Needed::Size(5)))
            )
        }
    }

    #[test]
    fn test_parse_called_station_id() {
        {
            let data = &[
                30, 19, 97, 97, 45, 98, 98, 45, 99, 99, 45, 100, 100, 45, 101, 101, 45, 102, 102
            ];
            assert_eq!(
                parse_radius_attribute(data),
                Ok((
                    &b""[..],
                    RadiusAttribute::CalledStationId("aa-bb-cc-dd-ee-ff".as_bytes())
                ))
            )
        }
    }

    #[test]
    fn test_parse_calling_station_id() {
        {
            let data = &[
                31, 19, 97, 97, 45, 98, 98, 45, 99, 99, 45, 100, 100, 45, 101, 101, 45, 102, 102
            ];
            assert_eq!(
                parse_radius_attribute(data),
                Ok((
                    &b""[..],
                    RadiusAttribute::CallingStationId("aa-bb-cc-dd-ee-ff".as_bytes())
                ))
            )
        }
    }
}