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use std::{io, mem::MaybeUninit, net::SocketAddr, time::Duration};

use crate::packet::ip::IpNextLevelProtocol;
use socket2::{Domain, Protocol, Socket as SystemSocket, Type};

use super::{IpVersion, SocketOption, SocketType};

pub(crate) fn check_socket_option(socket_option: SocketOption) -> Result<(), String> {
    match socket_option.ip_version {
        IpVersion::V4 => match socket_option.socket_type {
            SocketType::Raw => match socket_option.protocol {
                Some(IpNextLevelProtocol::Icmp) => Ok(()),
                Some(IpNextLevelProtocol::Tcp) => Ok(()),
                Some(IpNextLevelProtocol::Udp) => Ok(()),
                _ => Err(String::from("Invalid protocol")),
            },
            SocketType::Dgram => match socket_option.protocol {
                Some(IpNextLevelProtocol::Icmp) => Ok(()),
                Some(IpNextLevelProtocol::Udp) => Ok(()),
                _ => Err(String::from("Invalid protocol")),
            },
            SocketType::Stream => match socket_option.protocol {
                Some(IpNextLevelProtocol::Tcp) => Ok(()),
                _ => Err(String::from("Invalid protocol")),
            },
        },
        IpVersion::V6 => match socket_option.socket_type {
            SocketType::Raw => match socket_option.protocol {
                Some(IpNextLevelProtocol::Icmpv6) => Ok(()),
                Some(IpNextLevelProtocol::Tcp) => Ok(()),
                Some(IpNextLevelProtocol::Udp) => Ok(()),
                _ => Err(String::from("Invalid protocol")),
            },
            SocketType::Dgram => match socket_option.protocol {
                Some(IpNextLevelProtocol::Icmpv6) => Ok(()),
                Some(IpNextLevelProtocol::Udp) => Ok(()),
                _ => Err(String::from("Invalid protocol")),
            },
            SocketType::Stream => match socket_option.protocol {
                Some(IpNextLevelProtocol::Tcp) => Ok(()),
                _ => Err(String::from("Invalid protocol")),
            },
        },
    }
}

/// Receive all IPv4 or IPv6 packets passing through a network interface
pub struct ListenerSocket {
    inner: SystemSocket,
}

impl ListenerSocket {
    /// Constructs a new ListenerSocket
    pub fn new(
        _socket_addr: SocketAddr,
        ip_version: IpVersion,
        protocol: Option<IpNextLevelProtocol>,
        timeout: Option<Duration>,
    ) -> io::Result<ListenerSocket> {
        let socket = match ip_version {
            IpVersion::V4 => match protocol {
                Some(IpNextLevelProtocol::Icmp) => {
                    SystemSocket::new(Domain::IPV4, Type::RAW, Some(Protocol::ICMPV4))?
                }
                Some(IpNextLevelProtocol::Tcp) => {
                    SystemSocket::new(Domain::IPV4, Type::RAW, Some(Protocol::TCP))?
                }
                Some(IpNextLevelProtocol::Udp) => {
                    SystemSocket::new(Domain::IPV4, Type::RAW, Some(Protocol::UDP))?
                }
                _ => SystemSocket::new(Domain::IPV4, Type::RAW, None)?,
            },
            IpVersion::V6 => match protocol {
                Some(IpNextLevelProtocol::Icmpv6) => {
                    SystemSocket::new(Domain::IPV6, Type::RAW, Some(Protocol::ICMPV6))?
                }
                Some(IpNextLevelProtocol::Tcp) => {
                    SystemSocket::new(Domain::IPV6, Type::RAW, Some(Protocol::TCP))?
                }
                Some(IpNextLevelProtocol::Udp) => {
                    SystemSocket::new(Domain::IPV6, Type::RAW, Some(Protocol::UDP))?
                }
                _ => SystemSocket::new(Domain::IPV6, Type::RAW, None)?,
            },
        };
        if let Some(timeout) = timeout {
            socket.set_read_timeout(Some(timeout))?;
        }
        //socket.bind(&socket_addr.into())?;
        Ok(ListenerSocket { inner: socket })
    }
    /// Receive packet without source address
    pub fn receive_from(&self, buf: &mut Vec<u8>) -> io::Result<(usize, SocketAddr)> {
        let recv_buf = unsafe { &mut *(buf.as_mut_slice() as *mut [u8] as *mut [MaybeUninit<u8>]) };
        match self.inner.recv_from(recv_buf) {
            Ok((packet_len, addr)) => match addr.as_socket() {
                Some(socket_addr) => {
                    return Ok((packet_len, socket_addr));
                }
                None => Err(io::Error::new(
                    io::ErrorKind::Other,
                    "Invalid socket address",
                )),
            },
            Err(e) => Err(e),
        }
    }
}