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use std::fmt;

use nom::{
    IResult,
    branch::alt,
    combinator::map,
    bytes::complete::tag
};

// https://www.iana.org/assignments/sdp-parameters/sdp-parameters.xhtml#sdp-parameters-4

#[derive(Debug, PartialEq, Clone)]
pub enum SdpNetworkType {
    Internet,
    Telephone,
    Atm,
    Pstn
}

pub fn parse_network_type(input: &[u8]) -> IResult<&[u8], SdpNetworkType> {
    alt((
        map(tag("IN"), |_| SdpNetworkType::Internet),
        map(tag("TN"), |_| SdpNetworkType::Telephone),
        map(tag("ATM"), |_| SdpNetworkType::Atm),
        map(tag("PSTN"), |_| SdpNetworkType::Pstn)
    ))(input)
}

impl fmt::Display for SdpNetworkType {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            SdpNetworkType::Internet => write!(f, "IN"),
            SdpNetworkType::Telephone => write!(f, "TN"),
            SdpNetworkType::Atm => write!(f, "ATM"),
            SdpNetworkType::Pstn => write!(f, "PSTN")
        }
    }
}