package application

// EventType identifies an application event consumed by UI adapters.
type EventType string

const (
	EventCatalogRefreshed  EventType = "CatalogRefreshed"
	EventCatalogRejected   EventType = "CatalogRejected"
	EventDownloadStarted   EventType = "DownloadStarted"
	EventDownloadProgress  EventType = "DownloadProgress"
	EventDownloadPaused    EventType = "DownloadPaused"
	EventDownloadCompleted EventType = "DownloadCompleted"
	EventDownloadFailed    EventType = "DownloadFailed"
	EventDownloadCanceled  EventType = "DownloadCanceled"
	EventInstallCompleted  EventType = "InstallCompleted"
	EventInstallRolledBack EventType = "InstallRolledBack"
	EventAppStarted        EventType = "AppStarted"
	EventAppExited         EventType = "AppExited"
	EventLicenseChanged    EventType = "LicenseChanged"
	EventIconReady         EventType = "IconReady"
	EventIconFailed        EventType = "IconFailed"
)

var validEventTypes = map[EventType]struct{}{
	EventCatalogRefreshed:  {},
	EventCatalogRejected:   {},
	EventDownloadStarted:   {},
	EventDownloadProgress:  {},
	EventDownloadPaused:    {},
	EventDownloadCompleted: {},
	EventDownloadFailed:    {},
	EventDownloadCanceled:  {},
	EventInstallCompleted:  {},
	EventInstallRolledBack: {},
	EventAppStarted:        {},
	EventAppExited:         {},
	EventLicenseChanged:    {},
	EventIconReady:         {},
	EventIconFailed:        {},
}

// Valid reports whether eventType is part of the documented event contract.
func (eventType EventType) Valid() bool {
	_, ok := validEventTypes[eventType]
	return ok
}

// Event is the common envelope delivered from background use cases to adapters.
//
// Payload is event-specific and will be replaced by concrete payload types as
// the corresponding use cases are implemented.
type Event struct {
	Type      EventType
	RequestID string
	AppID     string
	Payload   any
}