syntax = "proto3";

package arbiter.shared.evm;

import "google/protobuf/empty.proto";

message EtherTransferMeaning {
  bytes to = 1; // 20-byte Ethereum address
  bytes value = 2; // U256 as big-endian bytes
}

message TokenInfo {
  string symbol = 1;
  bytes address = 2; // 20-byte Ethereum address
  uint64 chain_id = 3;
}

// Mirror of token_transfers::Meaning
message TokenTransferMeaning {
  TokenInfo token = 1;
  bytes to = 2; // 20-byte Ethereum address
  bytes value = 3; // U256 as big-endian bytes
}

// Mirror of policies::SpecificMeaning
message SpecificMeaning {
  oneof meaning {
    EtherTransferMeaning ether_transfer = 1;
    TokenTransferMeaning token_transfer = 2;
  }
}

message GasLimitExceededViolation {
  optional bytes max_gas_fee_per_gas = 1; // U256 as big-endian bytes
  optional bytes max_priority_fee_per_gas = 2; // U256 as big-endian bytes
}

message EvalViolation {
  message ChainIdMismatch {
    uint64 expected = 1;
    uint64 actual = 2;
  }
  oneof kind {
    bytes invalid_target = 1; // 20-byte Ethereum address
    GasLimitExceededViolation gas_limit_exceeded = 2;
    google.protobuf.Empty rate_limit_exceeded = 3;
    google.protobuf.Empty volumetric_limit_exceeded = 4;
    google.protobuf.Empty invalid_time = 5;
    google.protobuf.Empty invalid_transaction_type = 6;

    ChainIdMismatch chain_id_mismatch = 7;
  }
}

// Transaction was classified but no grant covers it
message NoMatchingGrantError {
  SpecificMeaning meaning = 1;
}

// Transaction was classified and a grant was found, but constraints were violated
message PolicyViolationsError {
  SpecificMeaning meaning = 1;
  repeated EvalViolation violations = 2;
}

// top-level error returned when transaction evaluation fails
message TransactionEvalError {
  oneof kind {
    google.protobuf.Empty contract_creation_not_supported = 1;
    google.protobuf.Empty unsupported_transaction_type = 2;
    NoMatchingGrantError no_matching_grant = 3;
    PolicyViolationsError policy_violations = 4;
  }
}