syntax = "proto3";
package ibc.core.client.v1;

option go_package = "github.com/cosmos/cosmos-sdk/x/ibc/core/02-client/types";

import "gogoproto/gogo.proto";
import "google/protobuf/any.proto";
import "cosmos/upgrade/v1beta1/upgrade.proto";

// IdentifiedClientState defines a client state with an additional client
// identifier field.
message IdentifiedClientState {
  // client identifier
  string client_id = 1 [(gogoproto.moretags) = "yaml:\"client_id\""];
  // client state
  google.protobuf.Any client_state = 2 [(gogoproto.moretags) = "yaml:\"client_state\""];
}

// ConsensusStateWithHeight defines a consensus state with an additional height field.
message ConsensusStateWithHeight {
  // consensus state height
  Height height = 1 [(gogoproto.nullable) = false];
  // consensus state
  google.protobuf.Any consensus_state = 2 [(gogoproto.moretags) = "yaml\"consensus_state\""];
}

// ClientConsensusStates defines all the stored consensus states for a given
// client.
message ClientConsensusStates {
  // client identifier
  string client_id = 1 [(gogoproto.moretags) = "yaml:\"client_id\""];
  // consensus states and their heights associated with the client
  repeated ConsensusStateWithHeight consensus_states = 2
      [(gogoproto.moretags) = "yaml:\"consensus_states\"", (gogoproto.nullable) = false];
}

// ClientUpdateProposal is a governance proposal. If it passes, the substitute client's
// consensus states starting from the 'initial height' are copied over to the subjects
// client state. The proposal handler may fail if the subject and the substitute do not
// match in client and chain parameters (with exception to latest height, frozen height, and chain-id).
// The updated client must also be valid (cannot be expired).
message ClientUpdateProposal {
  option (gogoproto.goproto_getters) = false;
  // the title of the update proposal
  string title = 1;
  // the description of the proposal
  string description = 2;
  // the client identifier for the client to be updated if the proposal passes
  string subject_client_id = 3 [(gogoproto.moretags) = "yaml:\"subject_client_id\""];
  // the substitute client identifier for the client standing in for the subject client
  string substitute_client_id = 4 [(gogoproto.moretags) = "yaml:\"susbtitute_client_id\""];
  // the intital height to copy consensus states from the substitute to the subject
  Height initial_height = 5 [(gogoproto.moretags) = "yaml:\"initial_height\"", (gogoproto.nullable) = false];
}

// UpgradeProposal is a gov Content type for initiating an IBC breaking
// upgrade.
message UpgradeProposal {
  option (gogoproto.goproto_getters)  = false;
  option (gogoproto.goproto_stringer) = false;
  option (gogoproto.equal)            = true;

  string                      title       = 1;
  string                      description = 2;
  cosmos.upgrade.v1beta1.Plan plan        = 3 [(gogoproto.nullable) = false];

  // An UpgradedClientState must be provided to perform an IBC breaking upgrade.
  // This will make the chain commit to the correct upgraded (self) client state before the upgrade occurs,
  // so that connecting chains can verify that the new upgraded client is valid by verifying a proof on the
  // previous version of the chain.
  // This will allow IBC connections to persist smoothly across planned chain upgrades
  google.protobuf.Any upgraded_client_state = 4 [(gogoproto.moretags) = "yaml:\"upgraded_client_state\""];
}

// Height is a monotonically increasing data type
// that can be compared against another Height for the purposes of updating and
// freezing clients
//
// Normally the RevisionHeight is incremented at each height while keeping RevisionNumber
// the same. However some consensus algorithms may choose to reset the
// height in certain conditions e.g. hard forks, state-machine breaking changes
// In these cases, the RevisionNumber is incremented so that height continues to
// be monitonically increasing even as the RevisionHeight gets reset
message Height {
  option (gogoproto.goproto_getters)  = false;
  option (gogoproto.goproto_stringer) = false;

  // the revision that the client is currently on
  uint64 revision_number = 1 [(gogoproto.moretags) = "yaml:\"revision_number\""];
  // the height within the given revision
  uint64 revision_height = 2 [(gogoproto.moretags) = "yaml:\"revision_height\""];
}

// Params defines the set of IBC light client parameters.
message Params {
  // allowed_clients defines the list of allowed client state types.
  repeated string allowed_clients = 1 [(gogoproto.moretags) = "yaml:\"allowed_clients\""];
}