@DslMarker annotation class MenuConfigurationPart

@Suppress("unused")
fun menuConfig(builder: MenuConfiguration.() -> Unit) = MenuConfiguration(builder)

@MenuConfigurationPart
class MenuConfiguration(
        inline val builder: MenuConfiguration.() -> Unit
)
{
    lateinit var header: MenuHeader

    lateinit var content: MenuContent

    init
    {
        builder()
    }

    inline fun header(builder: MenuHeader.() -> Unit)
    {
        this.header = MenuHeader().apply(builder)
    }

    inline fun content(builder: MenuContent.() -> Unit)
    {
        this.content = MenuContent().apply(builder)
    }

    override fun equals(other: Any?): Boolean = TODO()

    override fun hashCode(): Int = TODO()
}

@MenuConfigurationPart
class MenuHeader
{
    lateinit var userEmail: () -> String

    val viewControllers: MutableList<AViewController> = mutableListOf()

    /**
     * [SEPARATOR_SETTING_INVISIBLE] - no separator
     * [SEPARATOR_SETTING_FULL_WIDTH] - full width separator
     * [SEPARATOR_SETTING_MARGINS] - separator with margins
     */
    @SeparatorWidthSetting
    var separatorWidthSetting: Int = SEPARATOR_SETTING_INVISIBLE

    var hasLogout = true

    operator fun AViewController.unaryPlus()
    {
        viewControllers.add(this)
    }

    companion object
    {
        @IntDef(SEPARATOR_SETTING_INVISIBLE, SEPARATOR_SETTING_FULL_WIDTH, SEPARATOR_SETTING_MARGINS)
        @Retention(AnnotationRetention.SOURCE)
        annotation class SeparatorWidthSetting

        const val SEPARATOR_SETTING_INVISIBLE = 0
        const val SEPARATOR_SETTING_FULL_WIDTH = 1
        const val SEPARATOR_SETTING_MARGINS = 2
    }
}

@MenuConfigurationPart
class MenuContent
{
    val items = mutableListOf<DiverseRecyclerAdapter.RecyclerItem<*, *>>()

    operator fun DiverseRecyclerAdapter.RecyclerItem<*, *>?.unaryPlus()
    {
        this ?: return

        items.add(this)
    }
}