package org.jetbrains.bsp.testkit

import java.util.AbstractMap

object FlatMapUtils {
  fun flatten(map: Map<String, Any>): Map<String, Any> = map.entries.flatMap { flatten(it) }.associate { "/${it.key}" to it.value }

  private fun flatten(entry: Map.Entry<String, Any>): List<Map.Entry<String, Any>> =
    when (val value = entry.value) {
      is Map<*, *> ->
        value.entries.flatMap { e ->
          flatten(AbstractMap.SimpleEntry("${entry.key}/${e.key}", e.value!!))
        }

      is List<*> ->
        value.indices
          .map { i ->
            AbstractMap.SimpleEntry("${entry.key}/$i", value[i]!!)
          }.flatMap { flatten(it) }

      else -> listOf(entry)
    }
}