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use bytes::BufMut;
use tendermint_proto::Error as ProtobufError;

use super::Proposal;
use crate::{chain::Id as ChainId, prelude::*, privval::RemoteSignerError};

/// SignProposalRequest is a request to sign a proposal
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct SignProposalRequest {
    /// Proposal
    pub proposal: Proposal,
    /// Chain ID
    pub chain_id: ChainId,
}

impl SignProposalRequest {
    /// Create signable bytes from Proposal.
    pub fn to_signable_bytes<B>(&self, sign_bytes: &mut B) -> Result<bool, ProtobufError>
    where
        B: BufMut,
    {
        self.proposal
            .to_signable_bytes(self.chain_id.clone(), sign_bytes)
    }

    /// Create signable vector from Proposal.
    pub fn into_signable_vec(self) -> Vec<u8> {
        self.proposal.into_signable_vec(self.chain_id)
    }
}

/// SignedProposalResponse is response containing a signed proposal or an error
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct SignedProposalResponse {
    /// Proposal
    pub proposal: Option<Proposal>,
    /// Response error
    pub error: Option<RemoteSignerError>,
}

// =============================================================================
// Protobuf conversions
// =============================================================================

tendermint_pb_modules! {
    use pb::privval::{
        SignProposalRequest as RawSignProposalRequest,
        SignedProposalResponse as RawSignedProposalResponse,
    };
    use crate::{Error, Proposal, chain::Id as ChainId, prelude::*};
    use super::{SignProposalRequest, SignedProposalResponse};

    impl Protobuf<RawSignProposalRequest> for SignProposalRequest {}
    impl Protobuf<RawSignedProposalResponse> for SignedProposalResponse {}

    impl TryFrom<RawSignProposalRequest> for SignProposalRequest {
        type Error = Error;

        fn try_from(value: RawSignProposalRequest) -> Result<Self, Self::Error> {
            if value.proposal.is_none() {
                return Err(Error::no_proposal_found());
            }
            Ok(SignProposalRequest {
                proposal: Proposal::try_from(value.proposal.unwrap())?,
                chain_id: ChainId::try_from(value.chain_id).unwrap(),
            })
        }
    }

    impl From<SignProposalRequest> for RawSignProposalRequest {
        fn from(value: SignProposalRequest) -> Self {
            RawSignProposalRequest {
                proposal: Some(value.proposal.into()),
                chain_id: value.chain_id.to_string(),
            }
        }
    }

    impl TryFrom<RawSignedProposalResponse> for SignedProposalResponse {
        type Error = Error;

        fn try_from(value: RawSignedProposalResponse) -> Result<Self, Self::Error> {
            Ok(SignedProposalResponse {
                proposal: value.proposal.map(TryInto::try_into).transpose()?,
                error: value.error.map(TryInto::try_into).transpose()?,
            })
        }
    }

    impl From<SignedProposalResponse> for RawSignedProposalResponse {
        fn from(value: SignedProposalResponse) -> Self {
            RawSignedProposalResponse {
                proposal: value.proposal.map(Into::into),
                error: value.error.map(Into::into),
            }
        }
    }
}