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use ntex_codec::Framed;
use std::{fmt, num::NonZeroU16};

use super::{codec, sink::MqttSink};
use crate::handshake::HandshakeResult;

/// Connect message
pub struct Connect<Io> {
    connect: codec::Connect,
    sink: MqttSink,
    io: HandshakeResult<Io, (), codec::Codec>,
    max_size: u32,
    max_receive: u16,
    max_topic_alias: u16,
}

impl<Io> Connect<Io> {
    pub(crate) fn new(
        connect: codec::Connect,
        io: HandshakeResult<Io, (), codec::Codec>,
        sink: MqttSink,
        max_size: u32,
        max_receive: u16,
        max_topic_alias: u16,
    ) -> Self {
        Self { connect, io, sink, max_size, max_receive, max_topic_alias }
    }

    pub fn packet(&self) -> &codec::Connect {
        &self.connect
    }

    pub fn packet_mut(&mut self) -> &mut codec::Connect {
        &mut self.connect
    }

    #[inline]
    pub fn io(&mut self) -> &mut Framed<Io, codec::Codec> {
        self.io.io()
    }

    /// Returns mqtt server sink
    pub fn sink(&self) -> &MqttSink {
        &self.sink
    }

    /// Ack connect message and set state
    pub fn ack<St>(self, st: St) -> ConnectAck<Io, St> {
        let mut packet = codec::ConnectAck {
            max_qos: Some(codec::QoS::AtLeastOnce),
            reason_code: codec::ConnectAckReason::Success,
            topic_alias_max: self.max_topic_alias,
            ..codec::ConnectAck::default()
        };
        if self.max_size != 0 {
            packet.max_packet_size = Some(self.max_size);
        }
        if self.max_receive != 0 {
            packet.receive_max = Some(NonZeroU16::new(self.max_receive).unwrap());
        }

        ConnectAck { io: self.io, sink: self.sink, session: Some(st), packet }
    }

    /// Create connect ack object with error
    pub fn failed<St>(self, reason: codec::ConnectAckReason) -> ConnectAck<Io, St> {
        let mut packet = codec::ConnectAck::default();
        packet.reason_code = reason;

        ConnectAck { io: self.io, sink: self.sink, session: None, packet }
    }

    /// Create connect ack object with provided ConnectAck packet
    pub fn fail_with<St>(self, ack: codec::ConnectAck) -> ConnectAck<Io, St> {
        ConnectAck { io: self.io, sink: self.sink, session: None, packet: ack }
    }
}

impl<T> fmt::Debug for Connect<T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.connect.fmt(f)
    }
}

/// Ack connect message
pub struct ConnectAck<Io, St> {
    pub(crate) io: HandshakeResult<Io, (), codec::Codec>,
    pub(crate) session: Option<St>,
    pub(crate) sink: MqttSink,
    pub(crate) packet: codec::ConnectAck,
}

impl<Io, St> ConnectAck<Io, St> {
    /// Set idle keep-alive for the connection in seconds.
    /// This method sets `server_keepalive_sec` property for `ConnectAck`
    /// response packet.
    ///
    /// By default idle keep-alive is set to 30 seconds. Panics if timeout is `0`.
    pub fn keep_alive(mut self, timeout: u16) -> Self {
        if timeout == 0 {
            panic!("Timeout must be greater than 0")
        }
        self.io.set_keepalive_timeout(timeout as usize);
        self
    }

    /// Access to ConnectAck packet
    #[inline]
    pub fn with(mut self, f: impl FnOnce(&mut codec::ConnectAck)) -> Self {
        f(&mut self.packet);
        self
    }
}