import Foundation

/// An in-app notification reporting an event of a speech model asset download.
struct AppNotification: Equatable, Identifiable {

    // MARK: Properties

    /// The unique identifier of the notification.
    let id: UUID

    /// The download event the notification reports.
    let event: Event

    /// The localized name of the locale whose speech model the event is about.
    let localeName: String

    // MARK: Initializers

    /// Creates a notification for a given download event and locale name.
    ///
    /// - Parameters:
    ///   - id: The unique identifier of the notification. Defaults to a newly generated identifier.
    ///   - event: The download event the notification reports.
    ///   - localeName: The localized name of the locale whose speech model the event is about.
    init(
        id: UUID = .init(),
        event: Event,
        localeName: String
    ) {
        self.id = id
        self.event = event
        self.localeName = localeName
    }

}

// MARK: - Enumerations

extension AppNotification {
    /// The download event the notification reports.
    enum Event: Sendable {
        /// The download was cancelled before it finished.
        case cancelled
        /// The download failed.
        case failed
        /// The download started.
        case started
    }
}

// MARK: - Properties

extension AppNotification {
    
    /// The system symbol of the icon matching the notification's event.
    var imageSymbol: String {
        switch event {
        case .cancelled: "xmark.circle"
        case .failed: "exclamationmark.triangle"
        case .started: "arrow.down.circle"
        }
    }

    /// The localized message of the notification, naming the locale of the speech model, from the app's string catalog.
    var textMessage: LocalizedStringResource {
        switch event {
        case .cancelled: .viewRecordingNotificationDownloadCancelled(localeName)
        case .failed: .viewRecordingNotificationDownloadFailed(localeName)
        case .started: .viewRecordingNotificationDownloadStarted(localeName)
        }
    }

}