import Logging

struct CompositeLogHandler: LogHandler {
    private var primary: any LogHandler
    private var secondary: any LogHandler

    init(primary: any LogHandler, secondary: any LogHandler) {
        self.primary = primary
        self.secondary = secondary
    }

    var metadata: Logger.Metadata {
        get { self.primary.metadata }
        set {
            self.primary.metadata = newValue
            self.secondary.metadata = newValue
        }
    }

    var logLevel: Logger.Level {
        get { self.primary.logLevel }
        set {
            self.primary.logLevel = newValue
            self.secondary.logLevel = newValue
        }
    }

    subscript(metadataKey metadataKey: String) -> Logger.Metadata.Value? {
        get { self.primary[metadataKey: metadataKey] }
        set {
            self.primary[metadataKey: metadataKey] = newValue
            self.secondary[metadataKey: metadataKey] = newValue
        }
    }

    func log(event: LogEvent) {
        self.primary.log(event: event)
        self.secondary.log(event: event)
    }
}