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use super::*;
use byteorder::{ByteOrder, LittleEndian};

pub trait AuthenticationFixedParametersTrait: FrameTrait {
    const FIXED_PARAMETERS_START: usize = 24;
    const FIXED_PARAMETERS_END: usize = Self::FIXED_PARAMETERS_START + 6;

    fn authentication_algorithm(&self) -> AuthenticationAlgorithm {
        AuthenticationAlgorithm::from_u16(LittleEndian::read_u16(
            &self.bytes()[Self::FIXED_PARAMETERS_START..(Self::FIXED_PARAMETERS_START + 2)],
        ))
    }

    fn authentication_seq(&self) -> u16 {
        LittleEndian::read_u16(
            &self.bytes()[(Self::FIXED_PARAMETERS_START + 2)..(Self::FIXED_PARAMETERS_START + 4)],
        )
    }

    fn status_code(&self) -> StatusCode {
        StatusCode::from_u16(LittleEndian::read_u16(
            &self.bytes()[(Self::FIXED_PARAMETERS_START + 4)..(Self::FIXED_PARAMETERS_START + 6)],
        ))
    }
}

#[derive(Debug, PartialEq)]
pub enum AuthenticationAlgorithm {
    OpenSystem,
    SharedKey,
    FastBSSTransition,
    SAE,
    FILSSharedKeyWithoutPFS,
    FILSSharedKeyWithPFS,
    FILSPublicKey,
    NetworkEAP, // 0x80
    Reserved(u16),
}
impl AuthenticationAlgorithm {
    #[must_use]
    pub fn from_u16(n: u16) -> Self {
        match n {
            0 => Self::OpenSystem,
            1 => Self::SharedKey,
            2 => Self::FastBSSTransition,
            3 => Self::SAE,
            4 => Self::FILSSharedKeyWithoutPFS,
            5 => Self::FILSSharedKeyWithPFS,
            6 => Self::FILSPublicKey,
            0x80 => Self::NetworkEAP, // 0x80
            other => Self::Reserved(other),
        }
    }
}