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A basic port to https://ktor.io/docs/server-status-pages.html

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/*
 * Copyright 2014-2022 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
 */

package dev.programadorthi.routing.statuspages

import kotlin.reflect.KClass

internal actual fun selectNearestParentClass(
    cause: Throwable,
    keys: List>,
): KClass<*>? = keys.minByOrNull { distance(cause.javaClass, it.java) }

private fun distance(
    child: Class<*>,
    parent: Class<*>,
): Int {
    var result = 0
    var current = child
    while (current != parent) {
        current = current.superclass
        result++
    }

    return result
}