// Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/)
//
// Licensed 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 policy;

import "context.proto";
import "policy-condition.proto";
import "policy-action.proto";

service PolicyService {
  rpc PolicyAddService (PolicyRuleService) returns (PolicyRuleState) {}
  rpc PolicyAddDevice (PolicyRuleDevice) returns (PolicyRuleState) {}
  rpc PolicyUpdateService (PolicyRuleService) returns (PolicyRuleState) {}
  rpc PolicyUpdateDevice (PolicyRuleDevice) returns (PolicyRuleState) {}
  rpc PolicyDelete (PolicyRuleId) returns (PolicyRuleState) {}
  rpc GetPolicyService (PolicyRuleId) returns (PolicyRuleService) {}
  rpc GetPolicyDevice (PolicyRuleId) returns (PolicyRuleDevice) {}
  rpc GetPolicyByServiceId (context.ServiceId) returns (PolicyRuleServiceList) {}
}

enum RuleState {
  POLICY_UNDEFINED = 0;     // Undefined rule state
  POLICY_FAILED = 1;        // Rule failed
  POLICY_INSERTED = 2;      // Rule is just inserted
  POLICY_VALIDATED = 3;     // Rule content is correct
  POLICY_PROVISIONED = 4;   // Rule subscribed to Monitoring
  POLICY_ACTIVE = 5;        // Rule is currently active (alarm is just thrown by Monitoring)
  POLICY_ENFORCED = 6;      // Rule action is successfully enforced
  POLICY_INEFFECTIVE = 7;   // The applied rule action did not work as expected
  POLICY_EFFECTIVE = 8;     // The applied rule action did work as expected
  POLICY_UPDATED = 9;       // Operator requires a policy to change
  POLICY_REMOVED = 10;      // Operator requires to remove a policy
}

message PolicyRuleId {
  context.Uuid uuid = 1;
}

message PolicyRuleState {
  RuleState policyRuleState = 1;
}

// Basic policy rule attributes
message PolicyRuleBasic {
  PolicyRuleId policyRuleId = 1;
  optional PolicyRuleState policyRuleState = 2;
  uint32 priority = 3;

  // Event-Condition-Action (ECA) model
  repeated PolicyRuleCondition conditionList = 4;  // When these policy conditions are met, an event is automatically thrown
  BooleanOperator booleanOperator = 5;             // Evaluation operator to be used
  repeated PolicyRuleAction actionList = 6;        // One or more actions should be applied
}

// Service-oriented policy rule
message PolicyRuleService {
  // Basic policy rule attributes
  PolicyRuleBasic policyRuleBasic = 1;

  // Affected service and (some of) its device(s)
  context.ServiceId serviceId = 2;
  repeated context.DeviceId deviceList = 3;  // List of devices this service is traversing (not exhaustive)
}

// Device-oriented policy rule
message PolicyRuleDevice {
  // Basic policy rule attributes
  PolicyRuleBasic policyRuleBasic = 1;

  // Affected device(s)
  repeated context.DeviceId deviceList = 2;
}

// A list of policy rule IDs
message PolicyRuleIdList {
  repeated PolicyRuleId policyRuleIdList = 1;
}

// A list of service-oriented policy rules
message PolicyRuleServiceList {
  repeated PolicyRuleService policyRuleServiceList = 1;
}

// A list of device-oriented policy rules
message PolicyRuleDeviceList {
  repeated PolicyRuleDevice policyRuleDeviceList = 1;
}