/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

syntax = "proto3";

package prometheus;
option java_package = "org.apache.horaedb.proto.internal";
option java_outer_classname = "Prometheus";
option go_package = "github.com/apache/incubator-horaedb-proto/golang/pkg/horaeprompb";

message Expr {
  oneof node {
    Operand operand = 1;
    SubExpr sub_expr = 2;
  };
}

message SubExpr {
  enum OperatorType {
    AGGR = 0;
    FUNC = 1;
    BINARY = 2;
  }
  OperatorType op_type = 1;
  string operator = 2;
  repeated Expr operands = 3;

  // for aggr
  repeated string group = 4;
  bool without = 5;

  // Not used for now
  // for binaryExpr
  // bool return_bool = 6;
  // bool rhs_contains_metric = 7;
}

message Operand {
  oneof value {
    double float_val = 1;
    string string_val = 2;
    Selector selector = 3;
  }
}

enum FilterType {
  LITERAL_OR = 0;
  NOT_LITERAL_OR = 1;
  REGEXP = 2;
  NOT_REGEXP_MATCH = 3;
}

message FilterOperator {
  FilterType filter_type = 1;
  repeated string params = 2;
}

message Filter {
  string tag_key = 1;
  repeated FilterOperator operators = 2;
}

message Selector {
  string measurement = 1;
  repeated Filter filters = 2;
  int64 start = 3;
  int64 end = 4;
  int64 align_start = 5;
  int64 align_end = 6;
  int64 step = 7;
  int64 range = 8;
  int64 offset = 9;
  string field = 10;
}

message Sample {
  double value = 1;
  int64 timestamp = 2;
}

message TimeSeries {
  repeated Label labels = 1;
  repeated Sample samples = 2;
}

message Label {
  string name = 1;
  string value = 2;
}

message Labels {
  repeated Label labels = 1;
}