// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

syntax = "proto3";

package hashicorp.consul.mesh.v2beta1;

import "pbcatalog/v2beta1/failover_policy.proto";
import "pbcatalog/v2beta1/protocol.proto";
import "pbcatalog/v2beta1/service_endpoints.proto";
import "pbmesh/v2beta1/common.proto";
import "pbmesh/v2beta1/destination_policy.proto";
import "pbmesh/v2beta1/grpc_route.proto";
import "pbmesh/v2beta1/http_route.proto";
import "pbmesh/v2beta1/http_route_retries.proto";
import "pbmesh/v2beta1/http_route_timeouts.proto";
import "pbresource/annotations.proto";
import "pbresource/resource.proto";

// This is a Resource type.
message ComputedRoutes {
  option (hashicorp.consul.resource.spec) = {scope: SCOPE_NAMESPACE};

  map<string, ComputedPortRoutes> ported_configs = 1;

  // BoundReferences is a slice of mixed type references of resources that were
  // involved in the formulation of this resource.
  repeated hashicorp.consul.resource.Reference bound_references = 2;
}

message ComputedPortRoutes {
  oneof config {
    ComputedHTTPRoute http = 1;
    ComputedGRPCRoute grpc = 2;
    ComputedTCPRoute tcp = 3;
  }
  bool using_default_config = 4; // TODO

  ParentReference parent_ref = 5;
  // Protocol is the ParentRef.Port's protocol. It is based on the value in the
  // Service object, but may differ depending upon which xRoutes are actually
  // in use.
  hashicorp.consul.catalog.v2beta1.Protocol protocol = 6;

  // map key is an opaque string; like disco chain target name
  map<string, BackendTargetDetails> targets = 7;
}

message ComputedHTTPRoute {
  reserved 1; // hostnames
  repeated ComputedHTTPRouteRule rules = 2;
}

message ComputedHTTPRouteRule {
  repeated HTTPRouteMatch matches = 1;
  repeated HTTPRouteFilter filters = 2;
  repeated ComputedHTTPBackendRef backend_refs = 3;
  HTTPRouteTimeouts timeouts = 4;
  HTTPRouteRetries retries = 5;
}

message ComputedHTTPBackendRef {
  // BackendTarget indicates which key in the targets map provides
  // the rest of the configuration.
  //
  // If this field is set to the empty string, or is the sentinel value
  // "NULL-ROUTE" is an indication that all of the traffic destined for this
  // backend reference should be null routed in a format appropriate for the
  // protocol (i.e. for HTTP use 5xx).
  string backend_target = 1;
  uint32 weight = 2;
  repeated HTTPRouteFilter filters = 3;
}

message ComputedGRPCRoute {
  reserved 1; // hostnames
  repeated ComputedGRPCRouteRule rules = 2;
}

message ComputedGRPCRouteRule {
  repeated GRPCRouteMatch matches = 1;
  repeated GRPCRouteFilter filters = 2;
  repeated ComputedGRPCBackendRef backend_refs = 3;
  HTTPRouteTimeouts timeouts = 4;
  HTTPRouteRetries retries = 5;
}

message ComputedGRPCBackendRef {
  // BackendTarget indicates which key in the targets map provides
  // the rest of the configuration.
  //
  // If this field is set to the empty string, or is the sentinel value
  // "NULL-ROUTE" is an indication that all of the traffic destined for this
  // backend reference should be null routed in a format appropriate for the
  // protocol (i.e. for HTTP use 5xx).
  string backend_target = 1;
  uint32 weight = 2;
  repeated GRPCRouteFilter filters = 3;
}

message ComputedTCPRoute {
  repeated ComputedTCPRouteRule rules = 1;
}

message ComputedTCPRouteRule {
  repeated ComputedTCPBackendRef backend_refs = 1;
}

// TODO: look into smuggling the target through a different typeURL, or just skip in favor of letting the caller do their own lookups?
message ComputedTCPBackendRef {
  // BackendTarget indicates which key in the targets map provides
  // the rest of the configuration.
  //
  // If this field is set to the empty string, or is the sentinel value
  // "NULL-ROUTE" is an indication that all of the traffic destined for this
  // backend reference should be null routed in a format appropriate for the
  // protocol (i.e. for HTTP use 5xx).
  string backend_target = 1;
  uint32 weight = 2;
}

message BackendTargetDetails {
  BackendTargetDetailsType type = 1;
  BackendReference backend_ref = 2;

  string mesh_port = 3;
  ComputedFailoverConfig failover_config = 4;
  DestinationConfig destination_config = 5;

  reserved 6 to 20; // leaving a gap between computed and retroactively added fields.

  // ServiceEndpointsID is not populated naturally and the field exists only for
  // downstream consumers.
  hashicorp.consul.resource.ID service_endpoints_id = 21;

  // ServiceEndpoints is not populated naturally and the field exists only for
  // downstream consumers.
  hashicorp.consul.catalog.v2beta1.ServiceEndpoints service_endpoints = 22;

  // IdentityRefs are not populated naturally and the field exists only for
  // downstream consumers.
  repeated hashicorp.consul.resource.Reference identity_refs = 23;
}

// +kubebuilder:validation:Enum=BACKEND_TARGET_DETAILS_TYPE_UNSPECIFIED;BACKEND_TARGET_DETAILS_TYPE_DIRECT;BACKEND_TARGET_DETAILS_TYPE_INDIRECT
// +kubebuilder:validation:Type=string
enum BackendTargetDetailsType {
  BACKEND_TARGET_DETAILS_TYPE_UNSPECIFIED = 0;

  // Direct means that the target is directly routable from a route. This does
  // not mean that the target is not also indirect though.
  BACKEND_TARGET_DETAILS_TYPE_DIRECT = 1;

  // Indirect means that the target is not directly routable from a route.
  //
  // One example would be for a FailoverPolicy destination.
  BACKEND_TARGET_DETAILS_TYPE_INDIRECT = 2;
}

message ComputedFailoverConfig {
  repeated ComputedFailoverDestination destinations = 1;
  hashicorp.consul.catalog.v2beta1.FailoverMode mode = 2;
  repeated string regions = 3;

  // SamenessGroup specifies the sameness group to failover to.
  string sameness_group = 4;
}

message ComputedFailoverDestination {
  // BackendTarget must be a Service.
  string backend_target = 1;
}