// TODO: This setup requires that the BN (beacon node) holds the block in state
// during the interval between the `GenerateProposalRequest` and the
// `SubmitProposalRequest`.
//
// This is sub-optimal as if a validator client switches BN during this process
// the block will be lost.
//
// This "stateful" method is being used presently because it's easier and
// requires less maintainence as the `BeaconBlock` definition changes.

syntax = "proto3";

package ethereum.beacon.rpc.v1;

// Service that currently identifies a beacon node
service BeaconNodeService {
    rpc Info(Empty) returns (NodeInfo);
}

/// Service that handles block production
service BeaconBlockService {
    rpc ProduceBeaconBlock(ProduceBeaconBlockRequest) returns (ProduceBeaconBlockResponse);
    rpc PublishBeaconBlock(PublishBeaconBlockRequest) returns (PublishBeaconBlockResponse);
}

/// Service that provides the validator client with requisite knowledge about
//its public keys
service ValidatorService {
	rpc ProposeBlockSlot(ProposeBlockSlotRequest) returns (ProposeBlockSlotResponse);
	rpc ValidatorIndex(PublicKey) returns (IndexResponse);
    // rpc ValidatorAssignment(ValidatorAssignmentRequest) returns (ValidatorAssignmentResponse);
}

/// Service that handles validator attestations
service AttestationService {
	rpc ProduceAttestationData (ProduceAttestationDataRequest) returns (ProduceAttestationDataResponse);
	rpc PublishAttestationData (PublishAttestationDataRequest) returns (PublishAttestationDataResponse);
}

/*
 * Beacon Node Service Message
 */
message NodeInfo {
    string version = 1;
    Fork fork = 2;
    uint32 chain_id = 3;
}

message Fork {
    bytes previous_version = 1;
    bytes current_version = 2;
    uint64 epoch = 3;
}

message Empty {
}



/*
 * Block Production Service Messages
 */

// Validator requests an unsigned proposal.
message ProduceBeaconBlockRequest {
    uint64 slot = 1;
}

// Beacon node returns an unsigned proposal.
message ProduceBeaconBlockResponse {
    BeaconBlock block = 1;
}

// Validator submits a signed proposal.
message PublishBeaconBlockRequest {
    BeaconBlock block = 1;
}

// Beacon node indicates a sucessfully submitted proposal.
message PublishBeaconBlockResponse {
    bool success = 1;
    bytes msg = 2;
}

message BeaconBlock {
	uint64 slot = 1;
	bytes block_root = 2;
	bytes randao_reveal = 3;
	bytes signature = 4;
}

/*
 * Validator Service Messages
 */
/*
message ValidatorAssignmentRequest {
	uint64 epoch = 1;
	bytes validator_index = 2;
}

// A validators duties for some epoch.
// TODO: add shard duties.
message ValidatorAssignment {
	oneof block_production_slot_oneof {
		bool block_production_slot_none = 1;
		uint64 block_production_slot = 2;
	}
}
*/

// Validator Assignment

message PublicKey {
	bytes public_key = 1;
}

message IndexResponse {
	uint64 index = 1;
}


// Propose slot

message ProposeBlockSlotRequest {
	uint64 epoch = 1;
	uint64 validator_index = 2;
}

message ProposeBlockSlotResponse {
	oneof slot_oneof {
		bool none = 1;
		uint64 slot = 2;
	}
}


/*
 * Attestation Service Messages
 */

message ProduceAttestationDataRequest {
	uint64 slot = 1;
	uint64 shard = 2;
}

message ProduceAttestationDataResponse {
	AttestationData attestation_data = 1;
}

message PublishAttestationDataRequest {
	FreeAttestation free_attestation = 1;
}

message PublishAttestationDataResponse {
	bool success = 1;
	bytes msg = 2;
}

message Crosslink {
	uint64 epoch = 1;
	bytes crosslink_data_root = 2;

}

message AttestationData {
	uint64 slot = 1;
	uint64 shard = 2;
	bytes beacon_block_root = 3;
	bytes epoch_boundary_root = 4;
	bytes crosslink_data_root = 5;
	Crosslink latest_crosslink = 6;
	uint64 justified_epoch = 7;
	bytes justified_block_root = 8;

}

message FreeAttestation {
	AttestationData attestation_data = 1;
	bytes signature = 2;
	uint64 validator_index = 3;
}