// Copyright 2025 Google LLC
//
// 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 google.cloud.visionai.v1alpha1;

import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/protobuf/duration.proto";
import "google/protobuf/struct.proto";
import "google/protobuf/timestamp.proto";

option csharp_namespace = "Google.Cloud.VisionAI.V1Alpha1";
option go_package = "cloud.google.com/go/visionai/apiv1alpha1/visionaipb;visionaipb";
option java_multiple_files = true;
option java_outer_classname = "StreamingResourcesProto";
option java_package = "com.google.cloud.visionai.v1alpha1";
option php_namespace = "Google\\Cloud\\VisionAI\\V1alpha1";
option ruby_package = "Google::Cloud::VisionAI::V1alpha1";

// The descriptor for a gstreamer buffer payload.
message GstreamerBufferDescriptor {
  // The caps string of the payload.
  string caps_string = 1;

  // Whether the buffer is a key frame.
  bool is_key_frame = 2;

  // PTS of the frame.
  google.protobuf.Timestamp pts_time = 3;

  // DTS of the frame.
  google.protobuf.Timestamp dts_time = 4;

  // Duration of the frame.
  google.protobuf.Duration duration = 5;
}

// The descriptor for a raw image.
message RawImageDescriptor {
  // Raw image format. Its possible values are: "srgb".
  string format = 1;

  // The height of the image.
  int32 height = 2;

  // The width of the image.
  int32 width = 3;
}

// The message that represents the data type of a packet.
message PacketType {
  // The message that fully specifies the type of the packet.
  message TypeDescriptor {
    // Detailed information about the type.
    //
    // It is non-empty only for specific type class codecs. Needed only when the
    // type string alone is not enough to disambiguate the specific type.
    oneof type_details {
      // GstreamerBufferDescriptor is the descriptor for gstreamer buffer type.
      GstreamerBufferDescriptor gstreamer_buffer_descriptor = 2;

      // RawImageDescriptor is the descriptor for the raw image type.
      RawImageDescriptor raw_image_descriptor = 3;
    }

    // The type of the packet. Its possible values is codec dependent.
    //
    // The fully qualified type name is always the concatenation of the
    // value in `type_class` together with the value in `type`, separated by a
    // '/'.
    //
    // Note that specific codecs can define their own type hierarchy, and so the
    // type string here can in fact be separated by multiple '/'s of its own.
    //
    // Please see the open source SDK for specific codec documentation.
    string type = 1;
  }

  // The type class of the packet. Its possible values are:
  // "gst", "protobuf", and "string".
  string type_class = 1;

  // The type descriptor.
  TypeDescriptor type_descriptor = 2;
}

// The message that represents server metadata.
message ServerMetadata {
  // The offset position for the packet in its stream.
  int64 offset = 1;

  // The timestamp at which the stream server receives this packet. This is
  // based on the local clock of on the server side. It is guaranteed to be
  // monotonically increasing for the packets within each session; however
  // this timestamp is not comparable across packets sent to the same stream
  // different sessions. Session here refers to one individual gRPC streaming
  // request to the stream server.
  google.protobuf.Timestamp ingest_time = 2;
}

// The message that represents series metadata.
message SeriesMetadata {
  // Series name. It's in the format of
  // "projects/{project}/locations/{location}/clusters/{cluster}/series/{stream}".
  string series = 1 [(google.api.resource_reference) = {
                       type: "visionai.googleapis.com/Series"
                     }];
}

// The message that represents packet header.
message PacketHeader {
  // Input only. The capture time of the packet.
  google.protobuf.Timestamp capture_time = 1 [(google.api.field_behavior) = INPUT_ONLY];

  // Input only. Immutable. The type of the payload.
  PacketType type = 2 [
    (google.api.field_behavior) = INPUT_ONLY,
    (google.api.field_behavior) = IMMUTABLE
  ];

  // Input only. This field is for users to attach user managed metadata.
  google.protobuf.Struct metadata = 3 [(google.api.field_behavior) = INPUT_ONLY];

  // Output only. Metadata that the server appends to each packet before sending
  // it to receivers. You don't need to set a value for this field when sending
  // packets.
  ServerMetadata server_metadata = 4 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Input only. Immutable. Metadata that the server needs to know where to
  // write the packets to. It's only required for the first packet.
  SeriesMetadata series_metadata = 5 [
    (google.api.field_behavior) = INPUT_ONLY,
    (google.api.field_behavior) = IMMUTABLE
  ];

  // Immutable. Packet flag set. SDK will set the flag automatically.
  int32 flags = 6 [(google.api.field_behavior) = IMMUTABLE];

  // Immutable. Header string for tracing across services. It should be set when the packet
  // is first arrived in the stream server.
  //
  // The input format is a lowercase hex string:
  //   - version_id: 1 byte, currently must be zero - hex encoded (2 characters)
  //   - trace_id: 16 bytes (opaque blob) - hex encoded (32 characters)
  //   - span_id: 8 bytes (opaque blob) - hex encoded (16 characters)
  //   - trace_options: 1 byte (LSB means tracing enabled) - hex encoded (2
  //   characters)
  // Example: "00-404142434445464748494a4b4c4d4e4f-6162636465666768-01"
  //           v  trace_id                         span_id          options
  string trace_context = 7 [(google.api.field_behavior) = IMMUTABLE];
}

// The quanta of datum that the series accepts.
message Packet {
  // The packet header.
  PacketHeader header = 1;

  // The payload of the packet.
  bytes payload = 2;
}
