// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package application defines types for describing applications.
package application

import (
	"time"
	"v.io/v23/security"
)

// Device manager application envelopes must present this title.
const DeviceManagerTitle = "device manager"

// Envelope is a collection of metadata that describes an application.
type Envelope struct {
	// Title is the publisher-assigned application title.  Application
	// installations with the same title are considered as belonging to the
	// same application by the application management system.
	//
	// A change in the title signals a new application.
	Title string
	// Args is an array of command-line arguments to be used when executing
	// the binary.
	Args []string
	// Binary identifies the application binary.
	Binary SignedFile
	// Publisher represents the set of blessings that have been bound to
	// the principal who published this binary.
	Publisher security.WireBlessings
	// Env is an array that stores the environment variable values to be
	// used when executing the binary.
	Env []string
	// Packages is the set of packages to install on the local filesystem
	// before executing the binary
	Packages Packages
	// Restarts specifies how many times the device manager will attempt
	// to automatically restart an application that has crashed before
	// giving up and marking the application as NotRunning.
	Restarts int32
	// RestartTimeWindow is the time window within which an
	// application exit is considered a crash that counts against the
	// Restarts budget. If the application crashes after less than
	// RestartTimeWindow time for Restarts consecutive times, the
	// application is marked NotRunning and no more restart attempts
	// are made. If the application has run continuously for more
	// than RestartTimeWindow, subsequent crashes will again benefit
	// from up to Restarts restarts (that is, the Restarts budget is
	// reset by a successful run of at least RestartTimeWindow
	// duration).
	RestartTimeWindow time.Duration
}

// Packages represents a set of packages. The map key is the local
// file/directory name, relative to the instance's packages directory, where the
// package should be installed. For archives, this name represents a directory
// into which the archive is to be extracted, and for regular files it
// represents the name for the file.  The map value is the package
// specification.
//
// Each object's media type determines how to install it.
//
// For example, with key=pkg1,value=SignedFile{File:binaryrepo/configfiles} (an
// archive), the "configfiles" package will be installed under the "pkg1"
// directory. With key=pkg2,value=SignedFile{File:binaryrepo/binfile} (a
// binary), the "binfile" file will be installed as the "pkg2" file.
//
// The keys must be valid file/directory names, without path separators.
//
// Any number of packages may be specified.
type Packages map[string]SignedFile

// SignedFile represents a file accompanied by a signature of its contents.
type SignedFile struct {
	//  File is the object name of the file.
	File string
	// Signature represents a signature on the sha256 hash of the file
	// contents by the publisher principal.
	Signature security.Signature
}