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// SPDX-License-Identifier: MIT

use futures::stream::StreamExt;
use std::{
    marker::PhantomData,
    net::{Ipv4Addr, Ipv6Addr},
};

use netlink_packet_route::{
    constants::*,
    nlas::rule::Nla,
    NetlinkMessage,
    RtnlMessage,
    RuleMessage,
};

use crate::{try_nl, Error, Handle};

/// A request to create a new rule. This is equivalent to the `ip rule add` command.
pub struct RuleAddRequest<T = ()> {
    handle: Handle,
    message: RuleMessage,
    replace: bool,
    _phantom: PhantomData<T>,
}

impl<T> RuleAddRequest<T> {
    pub(crate) fn new(handle: Handle) -> Self {
        let mut message = RuleMessage::default();

        message.header.table = RT_TABLE_MAIN;
        message.header.action = FR_ACT_UNSPEC;

        RuleAddRequest {
            handle,
            message,
            replace: false,
            _phantom: Default::default(),
        }
    }

    /// Sets the input interface name.
    pub fn input_interface(mut self, ifname: String) -> Self {
        self.message.nlas.push(Nla::Iifname(ifname));
        self
    }

    /// Sets the output interface name.
    pub fn output_interface(mut self, ifname: String) -> Self {
        self.message.nlas.push(Nla::OifName(ifname));
        self
    }

    /// Sets the rule table.
    ///
    /// Default is main rule table.
    pub fn table(mut self, table: u8) -> Self {
        self.message.header.table = table;
        self
    }

    /// Set the tos.
    pub fn tos(mut self, tos: u8) -> Self {
        self.message.header.tos = tos;
        self
    }

    /// Set action.
    pub fn action(mut self, action: u8) -> Self {
        self.message.header.action = action;
        self
    }

    /// Build an IP v4 rule
    pub fn v4(mut self) -> RuleAddRequest<Ipv4Addr> {
        self.message.header.family = AF_INET as u8;
        RuleAddRequest {
            handle: self.handle,
            message: self.message,
            replace: false,
            _phantom: Default::default(),
        }
    }

    /// Build an IP v6 rule
    pub fn v6(mut self) -> RuleAddRequest<Ipv6Addr> {
        self.message.header.family = AF_INET6 as u8;
        RuleAddRequest {
            handle: self.handle,
            message: self.message,
            replace: false,
            _phantom: Default::default(),
        }
    }

    /// Replace existing matching rule.
    pub fn replace(self) -> Self {
        Self {
            replace: true,
            ..self
        }
    }

    /// Execute the request.
    pub async fn execute(self) -> Result<(), Error> {
        let RuleAddRequest {
            mut handle,
            message,
            replace,
            ..
        } = self;
        let mut req = NetlinkMessage::from(RtnlMessage::NewRule(message));
        let replace = if replace { NLM_F_REPLACE } else { NLM_F_EXCL };
        req.header.flags = NLM_F_REQUEST | NLM_F_ACK | replace | NLM_F_CREATE;

        let mut response = handle.request(req)?;
        while let Some(message) = response.next().await {
            try_nl!(message);
        }

        Ok(())
    }

    pub fn message_mut(&mut self) -> &mut RuleMessage {
        &mut self.message
    }
}

impl RuleAddRequest<Ipv4Addr> {
    /// Sets the source address prefix.
    pub fn source_prefix(mut self, addr: Ipv4Addr, prefix_length: u8) -> Self {
        self.message.header.src_len = prefix_length;
        let src = addr.octets().to_vec();
        self.message.nlas.push(Nla::Source(src));
        self
    }

    /// Sets the destination address prefix.
    pub fn destination_prefix(mut self, addr: Ipv4Addr, prefix_length: u8) -> Self {
        self.message.header.dst_len = prefix_length;
        let dst = addr.octets().to_vec();
        self.message.nlas.push(Nla::Destination(dst));
        self
    }
}

impl RuleAddRequest<Ipv6Addr> {
    /// Sets the source address prefix.
    pub fn source_prefix(mut self, addr: Ipv6Addr, prefix_length: u8) -> Self {
        self.message.header.src_len = prefix_length;
        let src = addr.octets().to_vec();
        self.message.nlas.push(Nla::Source(src));
        self
    }

    /// Sets the destination address prefix.
    pub fn destination_prefix(mut self, addr: Ipv6Addr, prefix_length: u8) -> Self {
        self.message.header.dst_len = prefix_length;
        let dst = addr.octets().to_vec();
        self.message.nlas.push(Nla::Destination(dst));
        self
    }
}