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Kotlin logging library with structured logging and coroutines support

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/*

   Copyright 2021-2024 Michael Strasser.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       https://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

*/

package io.klogging.rendering

import io.klogging.events.EventItems
import kotlinx.serialization.json.JsonArray
import kotlinx.serialization.json.JsonElement
import kotlinx.serialization.json.JsonObject
import kotlinx.serialization.json.JsonPrimitive

/**
 * Serialize a map with string keys to JSON.
 */
public fun serializeMap(map: EventItems): String {
    val element = map.toJsonElement()
    return element.toString()
}

private fun primitive(value: Any): JsonPrimitive = when (value) {
    is Number -> JsonPrimitive(value)
    is Boolean -> JsonPrimitive(value)
    else -> JsonPrimitive(value.toString())
}

private fun List<*>.toJsonElement(): JsonElement {
    val list: MutableList = mutableListOf()
    this.forEach {
        val value = it ?: return@forEach
        when (value) {
            is Map<*, *> -> list.add((value).toJsonElement())
            is List<*> -> list.add(value.toJsonElement())
            else -> list.add(primitive(value))
        }
    }
    return JsonArray(list)
}

private fun Map<*, *>.toJsonElement(): JsonElement {
    val map: MutableMap = mutableMapOf()
    this.forEach {
        val key = it.key as? String ?: return@forEach
        val value = it.value ?: return@forEach
        when (value) {
            is Map<*, *> -> map[key] = (value).toJsonElement()
            is List<*> -> map[key] = value.toJsonElement()
            else -> map[key] = primitive(value)
        }
    }
    return JsonObject(map)
}