// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

syntax = "proto3";

package cobalt;

import "config/metric_definition.proto";
import "config/report_definition.proto";
import "config/project.proto";

// An identifier of a locally aggregated report.
message ReportAggregationKey {
  uint32 customer_id = 1;
  uint32 project_id = 2;
  uint32 metric_id = 3;
  uint32 report_id = 4;
}

// A container used by the EventAggregator to store local aggregates of
// logged events.
message LocalAggregateStore {
  // Keyed by base64-encoded serializations of ReportAggregationKey messages.
  map<string, ReportAggregates> by_report_key = 1;
}

message ReportAggregates {
  // A collection of aggregates whose form depends on the report type.
  oneof type {
    UniqueActivesReportAggregates unique_actives_aggregates = 1;
    PerDeviceCountReportAggregates count_aggregates = 2;
  }
  // The configuration for the report represented by the ReportAggregationKey
  // of this ReportAggregates.
  AggregationConfig aggregation_config = 100;
}

message UniqueActivesReportAggregates {
  // Keyed by event code.
  map<uint32, DailyAggregates> by_event_code = 1;
}

message PerDeviceCountReportAggregates {
  // Keyed by component string.
  map<string, EventCodeAggregates> by_component = 1;
}

message EventCodeAggregates {
  // Keyed by event code.
  map<uint32, DailyAggregates> by_event_code = 1;
}

message DailyAggregates {
  // Keyed by day index.
  map<uint32, DailyAggregate> by_day_index = 1;
}

// A value formed by aggregating the events logged for a single report, event
// code, and day index.
message DailyAggregate {
  oneof type {
    ActivityDailyAggregate activity_daily_aggregate = 1;
    CountDailyAggregate count_daily_aggregate = 2;
  }
}

// A representation of the occurrence or non-occurrence of an event code on
// a given day.
message ActivityDailyAggregate {
  bool activity_indicator = 1;
}

// A representation of the number of occurrences of a particular event code,
// with a particular component label, on a given day.
message CountDailyAggregate {
  int64 count = 1;
}

// A representation of the configuration of a locally aggregated report and
// of its parent metric.
message AggregationConfig {
  // A Project message.
  Project project = 1;
  // A MetricDefinition.
  //
  // TODO(pesk): When implementing handling of config changes, replace this
  // field with a MetricDefinition with all ReportDefinitions removed, as well
  // as all fields which should not affect the EventAggregator's handling
  // of the MetricDefinition.
  MetricDefinition metric = 2;
  // A ReportDefinition message.
  //
  // TODO(pesk): When implementing handling of config changes, replace this
  // field with a ReportDefinition with all WindowSizes removed, as well as
  // all fields which should not affect the EventAggregator's handling of the
  // ReportDefinition.
  ReportDefinition report = 3;
}

// A container used by the EventAggregator to store the history of generated
// Observations, indexed by report.
message AggregatedObservationHistoryStore {
  // Keyed by base64-encoded serializations of ReportAggregationKey messages.
  map<string, AggregatedObservationHistory> by_report_key = 1;
}

// A container for the history of Observations that have been generated for a
// single report.
message AggregatedObservationHistory {
  // If this is a locally aggregated report, then AggregatedObservationHistory
  // has one of the following types.
  oneof type {
    // A container for the history of UniqueActivesObservations generated
    // for a UNIQUE_N_DAY_ACTIVES report.
    UniqueActivesObservationHistory unique_actives_history = 1;
    // A container for the history of PerDeviceCountObservations generated
    // for a PER_DEVICE_COUNT_STATS report.
    PerDeviceCountObservationHistory per_device_count_history = 2;
  }
  // A container for the history of ReportParticipationObservations generated
  // for this report. Unset if ReportParticipationObservations should not be
  // generated for this report.
  ReportParticipationObservationHistory report_participation_history = 100;
}

message UniqueActivesObservationHistory {
  // Keyed by event code.
  map<uint32, HistoryByWindowSize> by_event_code = 1;
}

message PerDeviceCountObservationHistory {
  // The history of PerDeviceCount Observations. Keyed by component string.
  map<string, HistoryByEventCode> by_component = 1;
}

message ReportParticipationObservationHistory {
  // The last day index for which a ReportParticipationObservation was
  // generated for this report.
  //
  // TODO(pesk): if ReportParticipationObservation has a window_size
  // field in the future, consider changing this to a repeated field
  // where the k-th last_generated field holds the value for window
  // size k.
  uint32 last_generated = 1;
}

message HistoryByEventCode {
  // Keyed by event code.
  map<uint32, HistoryByWindowSize> by_event_code = 1;
}

message HistoryByWindowSize {
  // Keyed by window size. The value at a window size is the latest day index
  // for which an Observation has been generated for this report, event code,
  // and window size.
  map<uint32, uint32> by_window_size = 1;
}