// Copyright 2023 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.v1;

import "google/api/annotations.proto";
import "google/api/client.proto";
import "google/api/field_behavior.proto";
import "google/api/resource.proto";
import "google/iam/v1/iam_policy.proto";
import "google/iam/v1/policy.proto";
import "google/protobuf/field_mask.proto";

option go_package = "cloud.google.com/go/billing/apiv1/billingpb;billingpb";
option java_multiple_files = true;
option java_outer_classname = "CloudBillingProto";
option java_package = "com.google.cloud.billing.v1";

// Retrieves the Google Cloud Console billing accounts and associates them with
// projects.
service CloudBilling {
  option (google.api.default_host) = "cloudbilling.googleapis.com";
  option (google.api.oauth_scopes) =
      "https://www.googleapis.com/auth/cloud-billing,"
      "https://www.googleapis.com/auth/cloud-billing.readonly,"
      "https://www.googleapis.com/auth/cloud-platform";

  // Gets information about a billing account. The current authenticated user
  // must be a [viewer of the billing
  // account](https://cloud.google.com/billing/docs/how-to/billing-access).
  rpc GetBillingAccount(GetBillingAccountRequest) returns (BillingAccount) {
    option (google.api.http) = {
      get: "/v1/{name=billingAccounts/*}"
    };
    option (google.api.method_signature) = "name";
  }

  // Lists the billing accounts that the current authenticated user has
  // permission to
  // [view](https://cloud.google.com/billing/docs/how-to/billing-access).
  rpc ListBillingAccounts(ListBillingAccountsRequest)
      returns (ListBillingAccountsResponse) {
    option (google.api.http) = {
      get: "/v1/billingAccounts"
    };
    option (google.api.method_signature) = "";
  }

  // Updates a billing account's fields.
  // Currently the only field that can be edited is `display_name`.
  // The current authenticated user must have the `billing.accounts.update`
  // IAM permission, which is typically given to the
  // [administrator](https://cloud.google.com/billing/docs/how-to/billing-access)
  // of the billing account.
  rpc UpdateBillingAccount(UpdateBillingAccountRequest)
      returns (BillingAccount) {
    option (google.api.http) = {
      patch: "/v1/{name=billingAccounts/*}"
      body: "account"
    };
    option (google.api.method_signature) = "name,account";
  }

  // This method creates [billing
  // subaccounts](https://cloud.google.com/billing/docs/concepts#subaccounts).
  //
  // Google Cloud resellers should use the
  // Channel Services APIs,
  // [accounts.customers.create](https://cloud.google.com/channel/docs/reference/rest/v1/accounts.customers/create)
  // and
  // [accounts.customers.entitlements.create](https://cloud.google.com/channel/docs/reference/rest/v1/accounts.customers.entitlements/create).
  //
  // When creating a subaccount, the current authenticated user must have the
  // `billing.accounts.update` IAM permission on the parent account, which is
  // typically given to billing account
  // [administrators](https://cloud.google.com/billing/docs/how-to/billing-access).
  // This method will return an error if the parent account has not been
  // provisioned for subaccounts.
  rpc CreateBillingAccount(CreateBillingAccountRequest)
      returns (BillingAccount) {
    option (google.api.http) = {
      post: "/v1/billingAccounts"
      body: "billing_account"
    };
    option (google.api.method_signature) = "billing_account";
  }

  // Lists the projects associated with a billing account. The current
  // authenticated user must have the `billing.resourceAssociations.list` IAM
  // permission, which is often given to billing account
  // [viewers](https://cloud.google.com/billing/docs/how-to/billing-access).
  rpc ListProjectBillingInfo(ListProjectBillingInfoRequest)
      returns (ListProjectBillingInfoResponse) {
    option (google.api.http) = {
      get: "/v1/{name=billingAccounts/*}/projects"
    };
    option (google.api.method_signature) = "name";
  }

  // Gets the billing information for a project. The current authenticated user
  // must have the `resourcemanager.projects.get` permission for the project,
  // which can be granted by assigning the [Project
  // Viewer](https://cloud.google.com/iam/docs/understanding-roles#predefined_roles)
  // role.
  rpc GetProjectBillingInfo(GetProjectBillingInfoRequest)
      returns (ProjectBillingInfo) {
    option (google.api.http) = {
      get: "/v1/{name=projects/*}/billingInfo"
    };
    option (google.api.method_signature) = "name";
  }

  // Sets or updates the billing account associated with a project. You specify
  // the new billing account by setting the `billing_account_name` in the
  // `ProjectBillingInfo` resource to the resource name of a billing account.
  // Associating a project with an open billing account enables billing on the
  // project and allows charges for resource usage. If the project already had a
  // billing account, this method changes the billing account used for resource
  // usage charges.
  //
  // *Note:* Incurred charges that have not yet been reported in the transaction
  // history of the Google Cloud Console might be billed to the new billing
  // account, even if the charge occurred before the new billing account was
  // assigned to the project.
  //
  // The current authenticated user must have ownership privileges for both the
  // [project](https://cloud.google.com/docs/permissions-overview#h.bgs0oxofvnoo
  // ) and the [billing
  // account](https://cloud.google.com/billing/docs/how-to/billing-access).
  //
  // You can disable billing on the project by setting the
  // `billing_account_name` field to empty. This action disassociates the
  // current billing account from the project. Any billable activity of your
  // in-use services will stop, and your application could stop functioning as
  // expected. Any unbilled charges to date will be billed to the previously
  // associated account. The current authenticated user must be either an owner
  // of the project or an owner of the billing account for the project.
  //
  // Note that associating a project with a *closed* billing account will have
  // much the same effect as disabling billing on the project: any paid
  // resources used by the project will be shut down. Thus, unless you wish to
  // disable billing, you should always call this method with the name of an
  // *open* billing account.
  rpc UpdateProjectBillingInfo(UpdateProjectBillingInfoRequest)
      returns (ProjectBillingInfo) {
    option (google.api.http) = {
      put: "/v1/{name=projects/*}/billingInfo"
      body: "project_billing_info"
    };
    option (google.api.method_signature) = "name,project_billing_info";
  }

  // Gets the access control policy for a billing account.
  // The caller must have the `billing.accounts.getIamPolicy` permission on the
  // account, which is often given to billing account
  // [viewers](https://cloud.google.com/billing/docs/how-to/billing-access).
  rpc GetIamPolicy(google.iam.v1.GetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.http) = {
      get: "/v1/{resource=billingAccounts/*}:getIamPolicy"
    };
    option (google.api.method_signature) = "resource";
  }

  // Sets the access control policy for a billing account. Replaces any existing
  // policy.
  // The caller must have the `billing.accounts.setIamPolicy` permission on the
  // account, which is often given to billing account
  // [administrators](https://cloud.google.com/billing/docs/how-to/billing-access).
  rpc SetIamPolicy(google.iam.v1.SetIamPolicyRequest)
      returns (google.iam.v1.Policy) {
    option (google.api.http) = {
      post: "/v1/{resource=billingAccounts/*}:setIamPolicy"
      body: "*"
    };
    option (google.api.method_signature) = "resource,policy";
  }

  // Tests the access control policy for a billing account. This method takes
  // the resource and a set of permissions as input and returns the subset of
  // the input permissions that the caller is allowed for that resource.
  rpc TestIamPermissions(google.iam.v1.TestIamPermissionsRequest)
      returns (google.iam.v1.TestIamPermissionsResponse) {
    option (google.api.http) = {
      post: "/v1/{resource=billingAccounts/*}:testIamPermissions"
      body: "*"
    };
    option (google.api.method_signature) = "resource,permissions";
  }
}

// A billing account in the
// [Google Cloud Console](https://console.cloud.google.com/). You can assign a
// billing account to one or more projects.
message BillingAccount {
  // Output only. The resource name of the billing account. The resource name
  // has the form `billingAccounts/{billing_account_id}`. For example,
  // `billingAccounts/012345-567890-ABCDEF` would be the resource name for
  // billing account `012345-567890-ABCDEF`.
  string name = 1 [
    (google.api.field_behavior) = OUTPUT_ONLY,
    (google.api.resource_reference) = {
      type: "cloudbilling.googleapis.com/BillingAccount"
    }
  ];

  // Output only. True if the billing account is open, and will therefore be
  // charged for any usage on associated projects. False if the billing account
  // is closed, and therefore projects associated with it will be unable to use
  // paid services.
  bool open = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The display name given to the billing account, such as `My Billing
  // Account`. This name is displayed in the Google Cloud Console.
  string display_name = 3;

  // If this account is a
  // [subaccount](https://cloud.google.com/billing/docs/concepts), then this
  // will be the resource name of the parent billing account that it is being
  // resold through.
  // Otherwise this will be empty.
  string master_billing_account = 4;
}

// Encapsulation of billing information for a Google Cloud Console project. A
// project has at most one associated billing account at a time (but a billing
// account can be assigned to multiple projects).
message ProjectBillingInfo {
  option (google.api.resource) = {
    type: "cloudbilling.googleapis.com/ProjectBillingInfo"
    pattern: "projects/{project}/billingInfo"
  };

  // Output only. The resource name for the `ProjectBillingInfo`; has the form
  // `projects/{project_id}/billingInfo`. For example, the resource name for the
  // billing information for project `tokyo-rain-123` would be
  // `projects/tokyo-rain-123/billingInfo`.
  string name = 1 [(google.api.field_behavior) = OUTPUT_ONLY];

  // Output only. The ID of the project that this `ProjectBillingInfo`
  // represents, such as `tokyo-rain-123`. This is a convenience field so that
  // you don't need to parse the `name` field to obtain a project ID.
  string project_id = 2 [(google.api.field_behavior) = OUTPUT_ONLY];

  // The resource name of the billing account associated with the project, if
  // any. For example, `billingAccounts/012345-567890-ABCDEF`.
  string billing_account_name = 3;

  // Output only. True if the project is associated with an open billing
  // account, to which usage on the project is charged. False if the project is
  // associated with a closed billing account, or no billing account at all, and
  // therefore cannot use paid services.
  bool billing_enabled = 4 [(google.api.field_behavior) = OUTPUT_ONLY];
}

// Request message for `GetBillingAccount`.
message GetBillingAccountRequest {
  // Required. The resource name of the billing account to retrieve. For
  // example, `billingAccounts/012345-567890-ABCDEF`.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudbilling.googleapis.com/BillingAccount"
    }
  ];
}

// Request message for `ListBillingAccounts`.
message ListBillingAccountsRequest {
  // Requested page size. The maximum page size is 100; this is also the
  // default.
  int32 page_size = 1;

  // A token identifying a page of results to return. This should be a
  // `next_page_token` value returned from a previous `ListBillingAccounts`
  // call. If unspecified, the first page of results is returned.
  string page_token = 2;

  // Options for how to filter the returned billing accounts.
  // This only supports filtering for
  // [subaccounts](https://cloud.google.com/billing/docs/concepts) under a
  // single provided parent billing account.
  // (e.g. "master_billing_account=billingAccounts/012345-678901-ABCDEF").
  // Boolean algebra and other fields are not currently supported.
  string filter = 3;
}

// Response message for `ListBillingAccounts`.
message ListBillingAccountsResponse {
  // A list of billing accounts.
  repeated BillingAccount billing_accounts = 1;

  // A token to retrieve the next page of results. To retrieve the next page,
  // call `ListBillingAccounts` again with the `page_token` field set to this
  // value. This field is empty if there are no more results to retrieve.
  string next_page_token = 2;
}

// Request message for `CreateBillingAccount`.
message CreateBillingAccountRequest {
  // Required. The billing account resource to create.
  // Currently CreateBillingAccount only supports subaccount creation, so
  // any created billing accounts must be under a provided parent billing
  // account.
  BillingAccount billing_account = 1 [(google.api.field_behavior) = REQUIRED];
}

// Request message for `UpdateBillingAccount`.
message UpdateBillingAccountRequest {
  // Required. The name of the billing account resource to be updated.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudbilling.googleapis.com/BillingAccount"
    }
  ];

  // Required. The billing account resource to replace the resource on the
  // server.
  BillingAccount account = 2 [(google.api.field_behavior) = REQUIRED];

  // The update mask applied to the resource.
  // Only "display_name" is currently supported.
  google.protobuf.FieldMask update_mask = 3;
}

// Request message for `ListProjectBillingInfo`.
message ListProjectBillingInfoRequest {
  // Required. The resource name of the billing account associated with the
  // projects that you want to list. For example,
  // `billingAccounts/012345-567890-ABCDEF`.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudbilling.googleapis.com/BillingAccount"
    }
  ];

  // Requested page size. The maximum page size is 100; this is also the
  // default.
  int32 page_size = 2;

  // A token identifying a page of results to be returned. This should be a
  // `next_page_token` value returned from a previous `ListProjectBillingInfo`
  // call. If unspecified, the first page of results is returned.
  string page_token = 3;
}

// Request message for `ListProjectBillingInfoResponse`.
message ListProjectBillingInfoResponse {
  // A list of `ProjectBillingInfo` resources representing the projects
  // associated with the billing account.
  repeated ProjectBillingInfo project_billing_info = 1;

  // A token to retrieve the next page of results. To retrieve the next page,
  // call `ListProjectBillingInfo` again with the `page_token` field set to this
  // value. This field is empty if there are no more results to retrieve.
  string next_page_token = 2;
}

// Request message for `GetProjectBillingInfo`.
message GetProjectBillingInfoRequest {
  // Required. The resource name of the project for which billing information is
  // retrieved. For example, `projects/tokyo-rain-123`.
  string name = 1 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference) = {
      type: "cloudresourcemanager.googleapis.com/Project"
    }
  ];
}

// Request message for `UpdateProjectBillingInfo`.
message UpdateProjectBillingInfoRequest {
  // Required. The resource name of the project associated with the billing
  // information that you want to update. For example,
  // `projects/tokyo-rain-123`.
  string name = 1 [(google.api.field_behavior) = REQUIRED];

  // The new billing information for the project. Output-only fields are
  // ignored; thus, you can leave empty all fields except
  // `billing_account_name`.
  ProjectBillingInfo project_billing_info = 2;
}
