public struct ApplicationNotificationIndicatorSourceID:
    Equatable, Hashable, RawRepresentable, Sendable
{
    public init(rawValue: String) {
        self.rawValue = rawValue
    }

    public var rawValue: String
}

public struct ApplicationNotificationIndicatorContribution: Equatable, Identifiable, Sendable {
    public struct ID: Equatable, Hashable, Sendable {
        public init(
            sourceID: ApplicationNotificationIndicatorSourceID,
            scopeID: String
        ) {
            self.sourceID = sourceID
            self.scopeID = scopeID
        }

        public var sourceID: ApplicationNotificationIndicatorSourceID
        public var scopeID: String
    }

    public init(id: ID, count: Int) {
        precondition(count >= 0, "Notification indicator contributions cannot be negative.")
        self.id = id
        self.count = count
    }

    public var id: ID
    public var count: Int
}

public struct ApplicationNotificationIndicatorSummary: Equatable, Sendable {
    public init(
        contributions: [ApplicationNotificationIndicatorContribution] = []
    ) {
        self.contributions = contributions
    }

    public var contributions: [ApplicationNotificationIndicatorContribution]

    public var totalCount: Int {
        contributions.reduce(0) { $0 + $1.count }
    }

    public var badgeCount: Int? {
        totalCount == 0 ? nil : totalCount
    }

    public func count(for scopeID: String) -> Int {
        contributions
            .filter { $0.id.scopeID == scopeID }
            .reduce(0) { $0 + $1.count }
    }
}