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//! UNSUBACK

use std::io::{Read, Write};

use crate::control::variable_header::PacketIdentifier;
use crate::control::{ControlType, FixedHeader, PacketType};
use crate::packet::{Packet, PacketError};
use crate::{Decodable, Encodable};

/// `UNSUBACK` packet
#[derive(Debug, Eq, PartialEq, Clone)]
pub struct UnsubackPacket {
    fixed_header: FixedHeader,
    packet_identifier: PacketIdentifier,
    payload: (),
}

impl UnsubackPacket {
    pub fn new(pkid: u16) -> UnsubackPacket {
        UnsubackPacket {
            fixed_header: FixedHeader::new(
                PacketType::with_default(ControlType::UnsubscribeAcknowledgement),
                2,
            ),
            packet_identifier: PacketIdentifier(pkid),
            payload: (),
        }
    }

    pub fn packet_identifier(&self) -> u16 {
        self.packet_identifier.0
    }

    pub fn set_packet_identifier(&mut self, pkid: u16) {
        self.packet_identifier.0 = pkid;
    }
}

impl Packet for UnsubackPacket {
    type Payload = ();

    fn fixed_header(&self) -> &FixedHeader {
        &self.fixed_header
    }

    fn payload(self) -> Self::Payload {
        self.payload
    }

    fn payload_ref(&self) -> &Self::Payload {
        &self.payload
    }

    fn encode_variable_headers<W: Write>(&self, writer: &mut W) -> Result<(), PacketError<Self>> {
        self.packet_identifier.encode(writer)?;

        Ok(())
    }

    fn encoded_variable_headers_length(&self) -> u32 {
        self.packet_identifier.encoded_length()
    }

    fn decode_packet<R: Read>(
        reader: &mut R,
        fixed_header: FixedHeader,
    ) -> Result<Self, PacketError<Self>> {
        let packet_identifier: PacketIdentifier = PacketIdentifier::decode(reader)?;
        Ok(UnsubackPacket {
            fixed_header,
            packet_identifier,
            payload: (),
        })
    }
}