Main.kt

import java.time.Instant
import java.util.*

fun main(args: Array<String>) {

    var historyStructure = listOf("id", "timestamp", "subtype")
    val list = mutableListOf<Map<String, Any?>>()

    val event = mapOf(
        "id" to UUID.randomUUID(),
        "timestamp" to Instant.now().toEpochMilli(),
        "subtype" to "PAYMENT~INTERNAL"
    )

    val record = event
        .filterKeys { key -> key in historyStructure }

    list.add(record)

    val event1 = mapOf(
        "id" to UUID.randomUUID(),
        "timestamp" to Instant.now().toEpochMilli(),
        "subtype" to null
    )

    val record1 = event1
        .filterKeys { key -> key in historyStructure }

    list.add(record1)

    var count = 0
    list.forEach { storedRecord ->
        if (storedRecord["subtype"] == "PAYMENT~INTERNAL") {
            count++
        }
    }
    println(count)

    historyStructure = historyStructure.toMutableList().apply { this.add("simId") }

    var count1 = 0
    list.forEach { storedRecord ->
        if (storedRecord["simId"] == "test-sim") {
            count1++
        }
    }
    println(count1)

    val event2 = mapOf(
        "id" to UUID.randomUUID(),
        "timestamp" to Instant.now().toEpochMilli(),
        "subtype" to null,
        "simId" to "test-sim"
    )

    val record2 = event2
        .filterKeys { key -> key in historyStructure }

    list.add(record2)

    var count2 = 0
    list.forEach { storedRecord ->
        if (storedRecord["simId"] == "test-sim") {
            count2++
        }
    }
    println(count2)

    historyStructure = historyStructure.toMutableList().apply { this.remove("subtype") }

    val event3 = mapOf(
        "id" to UUID.randomUUID(),
        "timestamp" to Instant.now().toEpochMilli(),
        "subtype" to "PAYMENT~EXTERNAL",
        "simId" to "test-sim"
    )

    val record3 = event3
        .filterKeys { key -> key in historyStructure }

    list.add(record3)

    var count3 = 0
    list.forEach { storedRecord ->
        if (storedRecord["simId"] == "test-sim") {
            count3++
        }
    }
    println(count3)


}