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use crate::{Buffer, DnsMessage, DnsMessageError, MutBuffer};
use crate::parse::Parse;
use crate::rdata::{RData, RDataParse};
use crate::write::WriteBytes;

/// # A host address
/// This record is used to return a ipv4 address for a host
#[derive(Copy, Clone, Debug, PartialEq)]
pub struct A {
    /// The host ipv4 address
    pub address: [u8; 4],
}

impl<'a> RDataParse<'a> for A {
    #[inline]
    fn parse(rdata: &RData<'a>, i: &mut usize) -> Result<Self, DnsMessageError> {
        Ok(Self { address: <[u8; 4]>::parse(rdata.buffer, i)? })
    }
}

impl WriteBytes for A {
    #[inline]
    fn write<
        const PTR_STORAGE: usize,
        const DNS_SECTION: usize,
        B: MutBuffer + Buffer,
    >(&self, message: &mut DnsMessage<PTR_STORAGE, DNS_SECTION, B>) -> Result<usize, DnsMessageError> {
        self.address.write(message)
    }
}

#[cfg(test)]
mod test {
    use crate::rdata::testutils::parse_write_test;

    use super::*;

    parse_write_test!(
        4,
        [0x01, 0x02, 0x03, 0x04],
        A {
            address: [0x01, 0x02, 0x03, 0x04],
        },
    );
}