// Copyright 2021 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.

package dbus

import "policy_manager/policymanagerproto"

// UpdateEngineClient is the generic interface for interacting with update-engine.
type UpdateEngineClient interface {
	// SetChannel Sets the target channel for update.
	SetChannel(targetChannel string) error

	// AttemptUpdate sends a request to update-engine to check for update.
	AttemptUpdate() error

	// GetStatus returns the update status.
	GetStatus() (*policymanagerproto.StatusResult, error)

	// SubscribeStatusUpdate subscribes the status update of update-engine.
	// It returns a channel so that any udpate status change of udpate-engine
	// will be sent to the channel.
	SubscribeStatusUpdate() (out <-chan UEGetStatusResponse, err error)
}

type UEGetStatusResponse struct {
	LastCheckedTime int64
	Progress        float64
	UpdateStatus    string
	NewVersion      string
	NewSize         int64
}