sealed interface IExercise {
    val id: Int
}

sealed class Exercise {
    @Serializable
    data class Remote(
        override val id: Int,
    ) : IExercise {
        fun toCacheEntity() = DB(
            id = id,
        )
    }

    data class Model(
        val isFavorite: Boolean,
        override val id: Int,
    ) : IExercise {
        fun toRemote() = Remote(
            id = id,
        )
    }
    data class DB(
        override val id: Int,
    ) : IExercise, RealmObject() {
        fun toModel(isFavorite: Boolean = false) = Model(
            id = id, isFavorite = isFavorite,
        )
    }
}