syntax = "proto3";

package ledger.v1;

import "google/protobuf/timestamp.proto";

enum AccountClass {
  ACCOUNT_CLASS_UNSPECIFIED = 0;
  ACCOUNT_CLASS_USER_AVAILABLE = 1;
  ACCOUNT_CLASS_USER_FROZEN = 2;
  ACCOUNT_CLASS_EXTERNAL_BLOCKCHAIN = 3;
  ACCOUNT_CLASS_TREASURY = 4;
  ACCOUNT_CLASS_MARKET_CLEARING = 5;
  ACCOUNT_CLASS_IPG_CLEARING = 6;
  ACCOUNT_CLASS_COMMISSION_REVENUE = 7;
}

enum TransactionState {
  TRANSACTION_STATE_UNSPECIFIED = 0;
  TRANSACTION_STATE_CREATED = 1;
  TRANSACTION_STATE_PENDING_TRANSACTION = 2;
  TRANSACTION_STATE_PENDING_ADMIN = 3;
  TRANSACTION_STATE_SUCCESSFUL = 4;
  TRANSACTION_STATE_FAILED = 5;
  TRANSACTION_STATE_SUSPENDED = 6;
}

message AccountReference {
  AccountClass account_class = 1;
  string owner_type = 2;
  string owner_id = 3;
  int64 asset_id = 4;
}

message JournalEntry {
  uint32 line_number = 1;
  AccountReference account = 2;
  // Canonical base-10 decimal. Positive is credit and negative is debit.
  string amount = 3;
  string description = 4;
}

message BlockchainReference {
  string network = 1;
  string transaction_hash = 2;
  string ledger_sequence = 3;
}

message Journal {
  string journal_id = 1;
  string source_service = 2;
  string idempotency_key = 3;
  string source_transaction_id = 4;
  string tracking_code = 5;
  string effect_kind = 6;
  uint32 event_version = 7;
  repeated JournalEntry entries = 8;
  optional string reversal_of_journal_id = 9;
  google.protobuf.Timestamp occurred_at = 10;
  google.protobuf.Timestamp recorded_at = 11;
  string correlation_id = 12;
  string actor_id = 13;
  BlockchainReference blockchain = 14;
  map<string, string> metadata = 15;
  string payload_hash = 16;
}

message AppendJournalRequest {
  string source_service = 1;
  string idempotency_key = 2;
  string source_transaction_id = 3;
  string tracking_code = 4;
  string effect_kind = 5;
  uint32 event_version = 6;
  repeated JournalEntry entries = 7;
  optional string reversal_of_journal_id = 8;
  google.protobuf.Timestamp occurred_at = 9;
  string correlation_id = 10;
  string actor_id = 11;
  BlockchainReference blockchain = 12;
  map<string, string> metadata = 13;
}

message AppendJournalResponse {
  Journal journal = 1;
  bool already_existed = 2;
}

message AppendTransactionEventRequest {
  string source_service = 1;
  string idempotency_key = 2;
  string source_transaction_id = 3;
  string tracking_code = 4;
  uint32 event_version = 5;
  TransactionState state = 6;
  string error_code = 7;
  string error_message = 8;
  google.protobuf.Timestamp occurred_at = 9;
  string correlation_id = 10;
  string actor_id = 11;
  BlockchainReference blockchain = 12;
  map<string, string> metadata = 13;
}

message TransactionEvent {
  string event_id = 1;
  AppendTransactionEventRequest event = 2;
  google.protobuf.Timestamp recorded_at = 3;
  string payload_hash = 4;
}

message AppendTransactionEventResponse {
  TransactionEvent event = 1;
  bool already_existed = 2;
}

message GetJournalRequest {
  oneof lookup {
    string journal_id = 1;
    string idempotency_key = 2;
  }
}

message ListEntriesRequest {
  optional AccountReference account = 1;
  optional int64 asset_id = 2;
  google.protobuf.Timestamp recorded_from = 3;
  google.protobuf.Timestamp recorded_to = 4;
  uint32 page_size = 5;
  string page_token = 6;
}

message ListEntriesResponse {
  repeated Journal journals = 1;
  string next_page_token = 2;
}

message GetBalanceRequest {
  AccountReference account = 1;
  google.protobuf.Timestamp as_of = 2;
}

message GetBalanceResponse {
  AccountReference account = 1;
  // Canonical base-10 decimal reconstructed from immutable entries.
  string balance = 2;
  google.protobuf.Timestamp as_of = 3;
}

message ReplayJournalsRequest {
  // Each item is independently atomic and uses normal append idempotency.
  repeated AppendJournalRequest journals = 1;
}

message ReplayJournalResult {
  string idempotency_key = 1;
  Journal journal = 2;
  bool already_existed = 3;
}

message ReplayJournalsResponse {
  repeated ReplayJournalResult results = 1;
}

message HealthResponse {
  bool serving = 1;
  bool database_ready = 2;
}