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// Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkOS library.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use super::*;

use snarkvm::prelude::{FromBytes, ToBytes};

use std::borrow::Cow;

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct ChallengeRequest<N: Network> {
    pub version: u32,
    pub listener_port: u16,
    pub node_type: NodeType,
    pub address: Address<N>,
    pub nonce: u64,
}

impl<N: Network> MessageTrait for ChallengeRequest<N> {
    /// Returns the message name.
    #[inline]
    fn name(&self) -> Cow<'static, str> {
        "ChallengeRequest".into()
    }
}

impl<N: Network> ToBytes for ChallengeRequest<N> {
    fn write_le<W: io::Write>(&self, mut writer: W) -> io::Result<()> {
        self.version.write_le(&mut writer)?;
        self.listener_port.write_le(&mut writer)?;
        self.node_type.write_le(&mut writer)?;
        self.address.write_le(&mut writer)?;
        self.nonce.write_le(&mut writer)?;
        Ok(())
    }
}

impl<N: Network> FromBytes for ChallengeRequest<N> {
    fn read_le<R: io::Read>(mut reader: R) -> io::Result<Self> {
        let version = u32::read_le(&mut reader)?;
        let listener_port = u16::read_le(&mut reader)?;
        let node_type = NodeType::read_le(&mut reader)?;
        let address = Address::<N>::read_le(&mut reader)?;
        let nonce = u64::read_le(&mut reader)?;

        Ok(Self { version, listener_port, node_type, address, nonce })
    }
}

impl<N: Network> ChallengeRequest<N> {
    pub fn new(listener_port: u16, node_type: NodeType, address: Address<N>, nonce: u64) -> Self {
        Self { version: Message::<N>::VERSION, listener_port, node_type, address, nonce }
    }
}

#[cfg(test)]
pub mod prop_tests {
    use crate::{ChallengeRequest, NodeType};
    use snarkvm::{
        console::prelude::{FromBytes, ToBytes},
        prelude::{Address, TestRng, Uniform},
    };

    use bytes::{Buf, BufMut, BytesMut};
    use proptest::prelude::{any, BoxedStrategy, Strategy};
    use test_strategy::proptest;

    type CurrentNetwork = snarkvm::prelude::Testnet3;

    pub fn any_valid_address() -> BoxedStrategy<Address<CurrentNetwork>> {
        any::<u64>().prop_map(|seed| Address::rand(&mut TestRng::fixed(seed))).boxed()
    }

    pub fn any_node_type() -> BoxedStrategy<NodeType> {
        (0..=2)
            .prop_map(|id| match id {
                0 => NodeType::Client,
                1 => NodeType::Prover,
                2 => NodeType::Validator,
                _ => unreachable!(),
            })
            .boxed()
    }

    pub fn any_challenge_request() -> BoxedStrategy<ChallengeRequest<CurrentNetwork>> {
        (any_valid_address(), any::<u64>(), any::<u32>(), any::<u16>(), any_node_type())
            .prop_map(|(address, nonce, version, listener_port, node_type)| ChallengeRequest {
                address,
                nonce,
                version,
                listener_port,
                node_type,
            })
            .boxed()
    }

    #[proptest]
    fn challenge_request_roundtrip(#[strategy(any_challenge_request())] original: ChallengeRequest<CurrentNetwork>) {
        let mut buf = BytesMut::default().writer();
        ChallengeRequest::write_le(&original, &mut buf).unwrap();

        let deserialized: ChallengeRequest<CurrentNetwork> =
            ChallengeRequest::read_le(buf.into_inner().reader()).unwrap();
        assert_eq!(original, deserialized);
    }
}