syntax = "proto3";
package persist;

message PersistRequest {
	uint64 seqNumber = 1;

	oneof msg {
		Set Set = 4;
		SetWithPrefix SetWithPrefix = 5;
		GetRequest GetRequest = 6;
		FindRequest FindRequest = 7;
		FindWithDirection FindWithDirection = 8;
		GetLastRequest GetLastRequest = 9;
		AppendDigest AppendDigest = 10;
		AppendStatements AppendStatements = 11;
		GetStatements GetStatements = 12;
		WriteFile WriteFile = 13;
	}
}

message PersistResponse {
	uint64 seqNumber = 1;

	oneof msg {
		SuccessMessage SuccessMessage = 4;
		ErrorMessage ErrorMessage = 5;
		GetResponse GetResponse = 6;
		FindResponse FindResponse = 7;
		GetLastResponse GetLastResponse = 8;
		GetStatementsResponse GetStatementsResponse = 9;
	}
}

message SuccessMessage {}

message ErrorMessage {
	string message = 1;
}

message Set {
	bytes key = 1;
	bytes value = 2;
}

message SetWithPrefix {
	bytes prefix = 1;
	bytes key = 2;
	bytes value = 3;
}

message GetRequest {
	bytes key = 1;
}
message GetResponse {
	SingleValue value = 1;
}
message SingleValue {
	bytes value = 1;
}

message GetLastRequest {}
message GetLastResponse {
	KeyValuePair kvp = 1;
}

message AppendDigest {
	bytes jsonSerial = 1;
}

message AppendStatements {
	bytes statementsSerial = 1;
}

message WriteFile {
	string fileName = 1;
	bytes data = 2;
}

message GetStatements {
	GetStatementsAccount accountFilter = 1;
	uint64 maxSize = 2;
	GetStatementsDatetime date = 3;
}
message GetStatementsAccount {
	bytes account = 1;
}
message GetStatementsDatetime {
	int32 year = 1;
	uint32 month = 2;
	uint32 day = 3;
}
message GetStatementsResponse {
	bytes statementsSerial = 1;
	bool readToEnd = 2;
}

// find with prefix and return matched results
// return result is `FindResponse`
message FindRequest {
	bytes prefix = 1;
	IterOptions options = 2;
	bool onlyKey = 3;
}

// If find the given key then return sequences before/after the key
// return result is `FindResponse`
message FindWithDirection {
	bytes key = 1;
	bool before = 2; // sequence before the specified key
	IterOptions options = 3;
	bool onlyKey = 4;
}

message FindResponse {
	repeated KeyValuePair kvpList = 1;
}

message KeyValuePair {
	bytes key = 1;
	bytes value = 2;
}

message IterOptions {
	uint32 startIndex = 1;
	uint32 count = 2;
}