syntax = "proto3";
package ibc.connection;

option go_package = "github.com/cosmos/cosmos-sdk/x/ibc/03-connection/types";

import "gogoproto/gogo.proto";
import "ibc/commitment/commitment.proto";

// MsgConnectionOpenInit defines the msg sent by an account on Chain A to
// initialize a connection with Chain B.
message MsgConnectionOpenInit {
  string       client_id     = 1 [(gogoproto.customname) = "ClientID", (gogoproto.moretags) = "yaml:\"client_id\""];
  string       connection_id = 2 [(gogoproto.customname) = "ConnectionID", (gogoproto.moretags) = "yaml:\"connection_id\""];
  Counterparty counterparty  = 3 [(gogoproto.nullable) = false];
  bytes        signer        = 4 [(gogoproto.casttype) = "github.com/cosmos/cosmos-sdk/types.AccAddress"];
}

// MsgConnectionOpenTry defines a msg sent by a Relayer to try to open a connection
// on Chain B.
message MsgConnectionOpenTry {
  string          client_id             = 1 [(gogoproto.customname) = "ClientID", (gogoproto.moretags) = "yaml:\"client_id\""];
  string          connection_id         = 2 [(gogoproto.customname) = "ConnectionID", (gogoproto.moretags) = "yaml:\"connection_id\""];
  Counterparty    counterparty          = 3 [(gogoproto.nullable) = false];
  repeated string counterparty_versions = 4 [(gogoproto.moretags) = "yaml:\"counterparty_versions\""];
  // proof of the initialization the connection on Chain A: `UNITIALIZED -> INIT`
  bytes proof_init = 5 [(gogoproto.moretags) = "yaml:\"proof_init\""];
  uint64 proof_height = 6;
  // proof of client consensus state
  bytes proof_consensus = 7
      [(gogoproto.moretags) = "yaml:\"proof_consensus\""];
  uint64 consensus_height = 8 [(gogoproto.moretags) = "yaml:\"consensus_height\""];
  bytes  signer           = 9 [(gogoproto.casttype) = "github.com/cosmos/cosmos-sdk/types.AccAddress"];
}

// MsgConnectionOpenAck defines a msg sent by a Relayer to Chain A to acknowledge
// the change of connection state to TRYOPEN on Chain B.
message MsgConnectionOpenAck {
  string connection_id = 1 [(gogoproto.customname) = "ConnectionID", (gogoproto.moretags) = "yaml:\"connection_id\""];
  string version       = 2;
  // proof of the initialization the connection on Chain B: `UNITIALIZED -> TRYOPEN`
  bytes proof_try = 3
      [(gogoproto.moretags) = "yaml:\"proof_try\""];
  uint64 proof_height = 4 [(gogoproto.moretags) = "yaml:\"proof_height\""];
  // proof of client consensus state
  bytes proof_consensus = 5
      [(gogoproto.moretags) = "yaml:\"proof_consensus\""];
  uint64 consensus_height = 6 [(gogoproto.moretags) = "yaml:\"consensus_height\""];
  bytes  signer           = 7 [(gogoproto.casttype) = "github.com/cosmos/cosmos-sdk/types.AccAddress"];
}

// MsgConnectionOpenConfirm defines a msg sent by a Relayer to Chain B to acknowledge
// the change of connection state to OPEN on Chain A.
message MsgConnectionOpenConfirm {
  string connection_id = 1 [(gogoproto.customname) = "ConnectionID", (gogoproto.moretags) = "yaml:\"connection_id\""];
  // proof for the change of the connection state on Chain A: `INIT -> OPEN`
  bytes proof_ack = 2
      [(gogoproto.moretags) = "yaml:\"proof_ack\""];
  uint64 proof_height = 3 [(gogoproto.moretags) = "yaml:\"proof_height\""];
  bytes  signer       = 4 [(gogoproto.casttype) = "github.com/cosmos/cosmos-sdk/types.AccAddress"];
}

// ICS03 - Connection Data Structures as defined in
// https://github.com/cosmos/ics/tree/master/spec/ics-003-connection-semantics#data-structures

// ConnectionEnd defines a stateful object on a chain connected to another separate
// one.
// NOTE: there must only be 2 defined ConnectionEnds to establish a connection
// between two chains.
message ConnectionEnd {
  option (gogoproto.goproto_getters) = false;
  // connection identifier.
  string id = 1 [(gogoproto.customname) = "ID", (gogoproto.moretags) = "yaml:\"id\""];
  // client associated with this connection.
  string client_id = 2 [(gogoproto.customname) = "ClientID", (gogoproto.moretags) = "yaml:\"client_id\""];
  // opaque string which can be utilised to determine encodings or protocols for
  // channels or packets utilising this connection
  repeated string versions = 3;
  // current state of the connection end.
  State state = 4;
  // counterparty chain associated with this connection.
  Counterparty counterparty = 5 [(gogoproto.nullable) = false];
}

// State defines if a connection is in one of the following states:
// INIT, TRYOPEN, OPEN or UNINITIALIZED.
enum State {
  option (gogoproto.goproto_enum_prefix) = false;

  // Default State
  STATE_UNINITIALIZED_UNSPECIFIED = 0 [(gogoproto.enumvalue_customname) = "UNINITIALIZED"];
  // A connection end has just started the opening handshake.
  STATE_INIT = 1 [(gogoproto.enumvalue_customname) = "INIT"];
  // A connection end has acknowledged the handshake step on the counterparty chain.
  STATE_TRYOPEN = 2 [(gogoproto.enumvalue_customname) = "TRYOPEN"];
  // A connection end has completed the handshake.
  STATE_OPEN = 3 [(gogoproto.enumvalue_customname) = "OPEN"];
}

// Counterparty defines the counterparty chain associated with a connection end.
message Counterparty {
  option (gogoproto.goproto_getters) = false;

  // identifies the client on the counterparty chain associated with a given connection.
  string client_id = 1 [(gogoproto.customname) = "ClientID", (gogoproto.moretags) = "yaml:\"client_id\""];
  // identifies the connection end on the counterparty chain associated with a given connection.
  string connection_id = 2 [(gogoproto.customname) = "ConnectionID", (gogoproto.moretags) = "yaml:\"connection_id\""];
  // commitment merkle prefix of the counterparty chain
  ibc.commitment.MerklePrefix prefix = 3 [(gogoproto.nullable) = false];
}

// ClientPaths define all the connection paths for a client state.
message ClientPaths {
  repeated string paths = 1;
}