// 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.billing.budgets.v1;

import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/protobuf/struct.proto";
import "google/type/date.proto";
import "google/type/money.proto";

option go_package = "cloud.google.com/go/billing/budgets/apiv1/budgetspb;budgetspb";
option java_multiple_files = true;
option java_outer_classname = "BudgetModelProto";
option java_package = "com.google.cloud.billing.budgets.v1";

// A budget is a plan that describes what you expect to spend on Cloud
// projects, plus the rules to execute as spend is tracked against that plan,
// (for example, send an alert when 90% of the target spend is met).
// The budget time period is configurable, with options such as month (default),
// quarter, year, or custom time period.
message Budget {
  option (google.api.resource) = {
    type: "billingbudgets.googleapis.com/Budget"
    pattern: "billingAccounts/{billing_account}/budgets/{budget}"
  };

  // Output only. Resource name of the budget.
  // The resource name implies the scope of a budget. Values are of the form
  // `billingAccounts/{billingAccountId}/budgets/{budgetId}`.
  string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // User data for display name in UI. The name must be less than or equal to 60
  // characters.
  string display_name = 2;

  // Optional. Filters that define which resources are used to compute the
  // actual spend against the budget amount, such as projects, services, and the
  // budget's time period, as well as other filters.
  Filter budget_filter = 3 [(google.api.field_behavior) = OPTIONAL];

  // Required. Budgeted amount.
  BudgetAmount amount = 4 [(google.api.field_behavior) = REQUIRED];

  // Optional. Rules that trigger alerts (notifications of thresholds
  // being crossed) when spend exceeds the specified percentages of the budget.
  //
  // Optional for `pubsubTopic` notifications.
  //
  // Required if using email notifications.
  repeated ThresholdRule threshold_rules = 5
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Rules to apply to notifications sent based on budget spend and
  // thresholds.
  NotificationsRule notifications_rule = 6
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. Etag to validate that the object is unchanged for a
  // read-modify-write operation.
  // An empty etag causes an update to overwrite other changes.
  string etag = 7 [(google.api.field_behavior) = OPTIONAL];
}

// The budgeted amount for each usage period.
message BudgetAmount {
  // Specification for what amount to use as the budget.
  oneof budget_amount {
    // A specified amount to use as the budget.
    // `currency_code` is optional. If specified when creating a budget, it must
    // match the currency of the billing account. If specified when updating a
    // budget, it must match the currency_code of the existing budget.
    // The `currency_code` is provided on output.
    google.type.Money specified_amount = 1;

    // Use the last period's actual spend as the budget for the present period.
    // LastPeriodAmount can only be set when the budget's time period is a
    // [Filter.calendar_period][google.cloud.billing.budgets.v1.Filter.calendar_period].
    // It cannot be set in combination with
    // [Filter.custom_period][google.cloud.billing.budgets.v1.Filter.custom_period].
    LastPeriodAmount last_period_amount = 2;
  }
}

// Describes a budget amount targeted to the last
// [Filter.calendar_period][google.cloud.billing.budgets.v1.Filter.calendar_period]
// spend. At this time, the amount is automatically 100% of the last calendar
// period's spend; that is, there are no other options yet.
// LastPeriodAmount cannot be set for a budget configured with
// a
// [Filter.custom_period][google.cloud.billing.budgets.v1.Filter.custom_period].
message LastPeriodAmount {}

// ThresholdRule contains the definition of a threshold. Threshold rules define
// the triggering events used to generate a budget notification email. When a
// threshold is crossed (spend exceeds the specified percentages of the
// budget), budget alert emails are sent to the email recipients you specify
// in the
// [NotificationsRule](#notificationsrule).
//
// Threshold rules also affect the fields included in the
// [JSON data
// object](https://cloud.google.com/billing/docs/how-to/budgets-programmatic-notifications#notification_format)
// sent to a Pub/Sub topic.
//
// Threshold rules are _required_ if using email notifications.
//
// Threshold rules are _optional_ if only setting a
// [`pubsubTopic` NotificationsRule](#NotificationsRule),
// unless you want your JSON data object to include data about the thresholds
// you set.
//
// For more information, see
// [set budget threshold rules and
// actions](https://cloud.google.com/billing/docs/how-to/budgets#budget-actions).
message ThresholdRule {
  // The type of basis used to determine if spend has passed the threshold.
  enum Basis {
    // Unspecified threshold basis.
    BASIS_UNSPECIFIED = 0;

    // Use current spend as the basis for comparison against the threshold.
    CURRENT_SPEND = 1;

    // Use forecasted spend for the period as the basis for comparison against
    // the threshold.
    // FORECASTED_SPEND can only be set when the budget's time period is a
    // [Filter.calendar_period][google.cloud.billing.budgets.v1.Filter.calendar_period].
    // It cannot be set in combination with
    // [Filter.custom_period][google.cloud.billing.budgets.v1.Filter.custom_period].
    FORECASTED_SPEND = 2;
  }

  // Required. Send an alert when this threshold is exceeded.
  // This is a 1.0-based percentage, so 0.5 = 50%.
  // Validation: non-negative number.
  double threshold_percent = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. The type of basis used to determine if spend has passed the
  // threshold. Behavior defaults to CURRENT_SPEND if not set.
  Basis spend_basis = 2 [(google.api.field_behavior) = OPTIONAL];
}

// NotificationsRule defines notifications that are sent based on budget spend
// and thresholds.
message NotificationsRule {
  // Optional. The name of the Pub/Sub topic where budget-related messages are
  // published, in the form `projects/{project_id}/topics/{topic_id}`. Updates
  // are sent to the topic at regular intervals; the timing of the updates is
  // not dependent on the [threshold rules](#thresholdrule) you've set.
  //
  // Note that if you want your
  // [Pub/Sub JSON
  // object](https://cloud.google.com/billing/docs/how-to/budgets-programmatic-notifications#notification_format)
  // to contain data for `alertThresholdExceeded`, you need at least one
  // [alert threshold rule](#thresholdrule). When you set threshold rules, you
  // must also enable at least one of the email notification options, either
  // using the default IAM recipients or Cloud Monitoring email notification
  // channels.
  //
  // To use Pub/Sub topics with budgets, you must do the following:
  //
  // 1. Create the Pub/Sub topic
  // before connecting it to your budget. For guidance, see
  // [Manage programmatic budget alert
  // notifications](https://cloud.google.com/billing/docs/how-to/budgets-programmatic-notifications).
  //
  // 2. Grant the API caller the `pubsub.topics.setIamPolicy` permission on
  // the Pub/Sub topic. If not set, the API call fails with PERMISSION_DENIED.
  // For additional details on Pub/Sub roles and permissions, see
  // [Permissions required for this
  // task](https://cloud.google.com/billing/docs/how-to/budgets-programmatic-notifications#permissions_required_for_this_task).
  string pubsub_topic = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Required when
  // [NotificationsRule.pubsub_topic][google.cloud.billing.budgets.v1.NotificationsRule.pubsub_topic]
  // is set. The schema version of the notification sent to
  // [NotificationsRule.pubsub_topic][google.cloud.billing.budgets.v1.NotificationsRule.pubsub_topic].
  // Only "1.0" is accepted. It represents the JSON schema as defined in
  // https://cloud.google.com/billing/docs/how-to/budgets-programmatic-notifications#notification_format.
  string schema_version = 2 [(google.api.field_behavior) = OPTIONAL];

  // Optional. Email targets to send notifications to when a threshold is
  // exceeded. This is in addition to the `DefaultIamRecipients` who receive
  // alert emails based on their billing account IAM role. The value is the full
  // REST resource name of a Cloud Monitoring email notification channel with
  // the form `projects/{project_id}/notificationChannels/{channel_id}`. A
  // maximum of 5 email notifications are allowed.
  //
  // To customize budget alert email recipients with monitoring notification
  // channels, you _must create the monitoring notification channels before
  // you link them to a budget_. For guidance on setting up notification
  // channels to use with budgets, see
  // [Customize budget alert email
  // recipients](https://cloud.google.com/billing/docs/how-to/budgets-notification-recipients).
  //
  // For Cloud Billing budget alerts, you _must use email notification
  // channels_. The other types of notification channels are _not_
  // supported, such as Slack, SMS, or PagerDuty. If you want to
  // [send budget notifications to
  // Slack](https://cloud.google.com/billing/docs/how-to/notify#send_notifications_to_slack),
  // use a pubsubTopic and configure
  // [programmatic
  // notifications](https://cloud.google.com/billing/docs/how-to/budgets-programmatic-notifications).
  repeated string monitoring_notification_channels = 3
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. When set to true, disables default notifications sent when a
  // threshold is exceeded. Default notifications are sent to those with Billing
  // Account Administrator and Billing Account User IAM roles for the target
  // account.
  bool disable_default_iam_recipients = 4
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. When set to true, and when the budget has a single project
  // configured, notifications will be sent to project level recipients of that
  // project. This field will be ignored if the budget has multiple or no
  // project configured.
  //
  // Currently, project level recipients are the users with `Owner` role on a
  // cloud project.
  bool enable_project_level_recipients = 5
      [(google.api.field_behavior) = OPTIONAL];
}

// A filter for a budget, limiting the scope of the cost to calculate.
message Filter {
  // Specifies how credits are applied when determining the spend for
  // threshold calculations. Budgets track the total cost minus any applicable
  // selected credits.
  // [See the documentation for a list of credit
  // types](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
  enum CreditTypesTreatment {
    CREDIT_TYPES_TREATMENT_UNSPECIFIED = 0;

    // All types of credit are subtracted from the gross cost to determine the
    // spend for threshold calculations.
    INCLUDE_ALL_CREDITS = 1;

    // All types of credit are added to the net cost to determine the spend for
    // threshold calculations.
    EXCLUDE_ALL_CREDITS = 2;

    // [Credit
    // types](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type)
    // specified in the credit_types field are subtracted from the
    // gross cost to determine the spend for threshold calculations.
    INCLUDE_SPECIFIED_CREDITS = 3;
  }

  // Optional. A set of projects of the form `projects/{project}`,
  // specifying that usage from only this set of projects should be
  // included in the budget. If omitted, the report includes all usage for
  // the billing account, regardless of which project the usage occurred on.
  repeated string projects = 1 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A set of folder and organization names of the form
  // `folders/{folderId}` or `organizations/{organizationId}`, specifying that
  // usage from only this set of folders and organizations should be included in
  // the budget. If omitted, the budget includes all usage that the billing
  // account pays for. If the folder or organization contains projects that are
  // paid for by a different Cloud Billing account, the budget *doesn't* apply
  // to those projects.
  repeated string resource_ancestors = 2
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. If
  // [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
  // is INCLUDE_SPECIFIED_CREDITS, this is a list of credit types to be
  // subtracted from gross cost to determine the spend for threshold
  // calculations. See [a list of acceptable credit type
  // values](https://cloud.google.com/billing/docs/how-to/export-data-bigquery-tables#credits-type).
  //
  // If
  // [Filter.credit_types_treatment][google.cloud.billing.budgets.v1.Filter.credit_types_treatment]
  // is **not** INCLUDE_SPECIFIED_CREDITS, this field must be empty.
  repeated string credit_types = 7 [(google.api.field_behavior) = OPTIONAL];

  // Optional. If not set, default behavior is `INCLUDE_ALL_CREDITS`.
  CreditTypesTreatment credit_types_treatment = 4
      [(google.api.field_behavior) = OPTIONAL];

  // Optional. A set of services of the form `services/{service_id}`,
  // specifying that usage from only this set of services should be
  // included in the budget. If omitted, the report includes usage for
  // all the services.
  // The service names are available through the Catalog API:
  // https://cloud.google.com/billing/v1/how-tos/catalog-api.
  repeated string services = 3 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A set of subaccounts of the form `billingAccounts/{account_id}`,
  // specifying that usage from only this set of subaccounts should be included
  // in the budget. If a subaccount is set to the name of the parent account,
  // usage from the parent account is included. If the field is omitted,
  // the report includes usage from the parent account and all subaccounts,
  // if they exist.
  repeated string subaccounts = 5 [(google.api.field_behavior) = OPTIONAL];

  // Optional. A single label and value pair specifying that usage from only
  // this set of labeled resources should be included in the budget. If omitted,
  // the report includes all labeled and unlabeled usage.
  //
  // An object containing a single `"key": value` pair. Example: `{ "name":
  // "wrench" }`.
  //
  //  _Currently, multiple entries or multiple values per entry are not
  //  allowed._
  map<string, google.protobuf.ListValue> labels = 6
      [(google.api.field_behavior) = OPTIONAL];

  // Multiple options to choose the budget's time period, specifying that only
  // usage that occurs during this time period should be included in the budget.
  // If not set, the <code>usage_period</code> defaults to CalendarPeriod.MONTH.
  oneof usage_period {
    // Optional. Specifies to track usage for recurring calendar period.
    // For example, assume that CalendarPeriod.QUARTER is set. The budget
    // tracks usage from April 1 to June 30, when the current calendar month is
    // April, May, June. After that, it tracks usage from July 1 to
    // September 30 when the current calendar month is July, August, September,
    // so on.
    CalendarPeriod calendar_period = 8 [(google.api.field_behavior) = OPTIONAL];

    // Optional. Specifies to track usage from any start date (required) to any
    // end date (optional). This time period is static, it does not recur.
    CustomPeriod custom_period = 9 [(google.api.field_behavior) = OPTIONAL];
  }
}

// All date times begin at 12 AM US and Canadian Pacific Time (UTC-8).
message CustomPeriod {
  // Required. The start date must be after January 1, 2017.
  google.type.Date start_date = 1 [(google.api.field_behavior) = REQUIRED];

  // Optional. The end date of the time period. Budgets with elapsed end date
  // won't be processed. If unset, specifies to track all usage incurred since
  // the start_date.
  google.type.Date end_date = 2 [(google.api.field_behavior) = OPTIONAL];
}

// A `CalendarPeriod` represents the abstract concept of a time period that
// has a canonical start. Grammatically, "the start of the current
// `CalendarPeriod`". All calendar times begin at 12 AM US and Canadian
// Pacific Time (UTC-8).
enum CalendarPeriod {
  // Calendar period is unset. This is the default if the budget is for a
  // custom time period (CustomPeriod).
  CALENDAR_PERIOD_UNSPECIFIED = 0;

  // A month. Month starts on the first day of each month, such as January 1,
  // February 1, March 1, and so on.
  MONTH = 1;

  // A quarter. Quarters start on dates January 1, April 1, July 1, and October
  // 1 of each year.
  QUARTER = 2;

  // A year. Year starts on January 1.
  YEAR = 3;
}