syntax = "proto3";
package cosmos.feegrant.v1beta1;

import "gogoproto/gogo.proto";
import "google/protobuf/any.proto";
import "cosmos_proto/cosmos.proto";
import "cosmos/base/v1beta1/coin.proto";
import "google/protobuf/timestamp.proto";
import "google/protobuf/duration.proto";

option go_package = "github.com/cosmos/cosmos-sdk/x/feegrant";

// BasicAllowance implements Allowance with a one-time grant of tokens
// that optionally expires. The grantee can use up to SpendLimit to cover fees.
message BasicAllowance {
  option (cosmos_proto.implements_interface) = "FeeAllowanceI";

  // spend_limit specifies the maximum amount of tokens that can be spent
  // by this allowance and will be updated as tokens are spent. If it is
  // empty, there is no spend limit and any amount of coins can be spent.
  repeated cosmos.base.v1beta1.Coin spend_limit = 1
      [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];

  // expiration specifies an optional time when this allowance expires
  google.protobuf.Timestamp expiration = 2 [(gogoproto.stdtime) = true];
}

// PeriodicAllowance extends Allowance to allow for both a maximum cap,
// as well as a limit per time period.
message PeriodicAllowance {
  option (cosmos_proto.implements_interface) = "FeeAllowanceI";

  // basic specifies a struct of `BasicAllowance`
  BasicAllowance basic = 1 [(gogoproto.nullable) = false];

  // period specifies the time duration in which period_spend_limit coins can
  // be spent before that allowance is reset
  google.protobuf.Duration period = 2 [(gogoproto.stdduration) = true, (gogoproto.nullable) = false];

  // period_spend_limit specifies the maximum number of coins that can be spent
  // in the period
  repeated cosmos.base.v1beta1.Coin period_spend_limit = 3
      [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];

  // period_can_spend is the number of coins left to be spent before the period_reset time
  repeated cosmos.base.v1beta1.Coin period_can_spend = 4
      [(gogoproto.nullable) = false, (gogoproto.castrepeated) = "github.com/cosmos/cosmos-sdk/types.Coins"];

  // period_reset is the time at which this period resets and a new one begins,
  // it is calculated from the start time of the first transaction after the
  // last period ended
  google.protobuf.Timestamp period_reset = 5 [(gogoproto.stdtime) = true, (gogoproto.nullable) = false];
}

// AllowedMsgAllowance creates allowance only for specified message types.
message AllowedMsgAllowance {
  option (gogoproto.goproto_getters)         = false;
  option (cosmos_proto.implements_interface) = "FeeAllowanceI";

  // allowance can be any of basic and filtered fee allowance.
  google.protobuf.Any allowance = 1 [(cosmos_proto.accepts_interface) = "FeeAllowanceI"];

  // allowed_messages are the messages for which the grantee has the access.
  repeated string allowed_messages = 2;
}

// Grant is stored in the KVStore to record a grant with full context
message Grant {
  // granter is the address of the user granting an allowance of their funds.
  string granter = 1;

  // grantee is the address of the user being granted an allowance of another user's funds.
  string grantee = 2;

  // allowance can be any of basic and filtered fee allowance.
  google.protobuf.Any allowance = 3 [(cosmos_proto.accepts_interface) = "FeeAllowanceI"];
}