Manage AI Prompts in Kotlin

import java.net.URI
import java.net.http.HttpClient
import java.net.http.HttpRequest
import java.net.http.HttpResponse
import kotlinx.serialization.Serializable
import kotlinx.serialization.json.Json

@Serializable
data class PromptResponse(val content: String)

suspend fun fetchPrompt(
    apiKey: String,
    promptId: String,
    vars: Map<String, String> = emptyMap(),
): String = withContext(Dispatchers.IO) {
    val params  = (mapOf("_version" to "latest") + vars)
        .entries.joinToString("&") { "${it.key}=${it.value}" }
    val url     = "https://www.promptforge-app.com/api/v1/prompts/$promptId?$params"

    val request = HttpRequest.newBuilder()
        .uri(URI.create(url))
        .header("Authorization", "Bearer $apiKey")
        .GET().build()

    val body = HttpClient.newHttpClient()
        .send(request, HttpResponse.BodyHandlers.ofString())
        .body()

    Json.decodeFromString<PromptResponse>(body).content
}