// Copyright © 2019 The Things Network Foundation, The Things Industries B.V.
//
// 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";

import "github.com/TheThingsIndustries/protoc-gen-go-flags/annotations.proto";
import "github.com/envoyproxy/protoc-gen-validate/validate/validate.proto";
import "google/protobuf/duration.proto";
import "google/api/annotations.proto";
import "google/protobuf/wrappers.proto";
import "lorawan-stack/api/lorawan.proto";

package ttn.lorawan.v3;

option go_package = "go.thethings.network/lorawan-stack/v3/pkg/ttnpb";

message ListFrequencyPlansRequest {
  option (thethings.flags.message) = { select: false, set: true };
  // Optional base frequency in MHz for hardware support (433, 470, 868 or 915)
  uint32 base_frequency = 1;
}

message FrequencyPlanDescription {
  string id = 1;
  // The ID of the frequency that the current frequency plan is based on.
  string base_id = 2;
  string name = 3;
  // Base frequency in MHz for hardware support (433, 470, 868 or 915)
  uint32 base_frequency = 4;
}

message ListFrequencyPlansResponse {
  repeated FrequencyPlanDescription frequency_plans = 1;
}

message GetPhyVersionsRequest {
  option (thethings.flags.message) = { select: false, set: true };
  // Optional Band ID to filter the results.
  // If unused, all supported Bands and their versions are returned.
  string band_id = 1;
}

message GetPhyVersionsResponse {
  message VersionInfo {
    string band_id = 1;
    repeated PHYVersion phy_versions = 2;
  }
  repeated VersionInfo version_info = 2;
}

message ListBandsRequest {
  option (thethings.flags.message) = { select: false, set: true };
  // Optional Band ID to filter the results.
  // If unused, all supported Bands are returned.
  string band_id = 1;
  // Optional PHY version to filter the results.
  // If unused, all supported versions are returned.
  PHYVersion phy_version = 2 [(validate.rules).enum.defined_only = true];
}

message BandDescription {
  string id = 1;

  message Beacon {
    DataRateIndex data_rate_index = 1;
    string coding_rate = 2;
    reserved 3; // inverted_polarity
    reserved 4; // compute_frequency
    repeated uint64 frequencies = 5;
  }

  Beacon beacon = 2;
  reserved 3; // ping_slot_frequency
  repeated uint64 ping_slot_frequencies = 32;

  uint32 max_uplink_channels = 4;

  message Channel {
    uint64 frequency = 1;
    DataRateIndex min_data_rate = 2;
    DataRateIndex max_data_rate = 3;
  }

  repeated Channel uplink_channels = 5;
  uint32 max_downlink_channels = 6;
  repeated Channel downlink_channels = 7;

  message SubBandParameters {
    uint64 min_frequency = 1;
    uint64 max_frequency = 2;
    float duty_cycle = 3;
    float max_eirp = 4;
  }

  repeated SubBandParameters sub_bands = 8;

  message BandDataRate {
    DataRate rate = 1;
    reserved 2; // max_mac_payload_size
  }

  map<uint32, BandDataRate> data_rates = 9;

  uint64 freq_multiplier = 10;
  bool implements_cf_list = 11;
  CFListType cf_list_type = 12;
  google.protobuf.Duration receive_delay_1 = 13;
  google.protobuf.Duration receive_delay_2 = 14;
  google.protobuf.Duration join_accept_delay_1 = 15;
  google.protobuf.Duration join_accept_delay_2 = 16;
  uint64 max_fcnt_gap = 17;
  bool supports_dynamic_adr = 18;
  ADRAckLimitExponent adr_ack_limit = 19;
  google.protobuf.Duration min_retransmit_timeout = 20;
  google.protobuf.Duration max_retransmit_timeout = 21;
  repeated float tx_offset = 22;
  DataRateIndex max_adr_data_rate_index = 23;

  bool tx_param_setup_req_support = 24;
  float default_max_eirp = 25;
  reserved 26; // rx1_channel
  reserved 27; // rx2_datarate
  reserved 28; // generate_ch_masks
  reserved 29; // parse_ch_mask

  message Rx2Parameters {
    DataRateIndex data_rate_index = 1;
    uint64 frequency = 2;
  }

  Rx2Parameters default_rx2_parameters = 30;

  message DwellTime {
    google.protobuf.BoolValue uplinks = 1;
    google.protobuf.BoolValue downlinks = 2;
  }

  DwellTime boot_dwell_time = 31;
}

message ListBandsResponse {
  message VersionedBandDescription {
    map<string, BandDescription> band = 1;
  }
  map<string, VersionedBandDescription> descriptions = 1;
}

service Configuration {
  rpc ListFrequencyPlans(ListFrequencyPlansRequest) returns (ListFrequencyPlansResponse) {
    option (google.api.http) = {
      get: "/configuration/frequency-plans"
    };
  }

  // Returns a list of supported LoRaWAN PHY Versions for the given Band ID.
  rpc GetPhyVersions(GetPhyVersionsRequest) returns (GetPhyVersionsResponse) {
    option (google.api.http) = {
      get: "/configuration/phy-versions"
    };
  }

  rpc ListBands(ListBandsRequest) returns (ListBandsResponse) {
    option (google.api.http) = {
      get: "/configuration/bands"
      additional_bindings {
        get: "/configuration/bands/{band_id}"
      }
      additional_bindings {
        get: "/configuration/bands/{band_id}/{phy_version}"
      }
    };
  }
}