package link.roadio.riff.userstate.android

import android.app.Application
import android.os.Process
import link.roadio.riff.userstate.ContentIds
import link.roadio.riff.userstate.contentHex
import java.util.concurrent.atomic.AtomicLong

/** Runtime provenance is meaningful control identity, never a persisted user clock. */
object RuntimeIds {
    private val ordinal = AtomicLong()
    private val incarnation by lazy {
        ContentIds().id("process-incarnation") {
            text(Application.getProcessName())
            int(Process.myPid())
            long(Process.getStartElapsedRealtime())
        }
    }

    fun epoch(domain: String): String = ContentIds().id(domain) { long(incarnation) }.contentHex()

    fun reference(
        domain: String,
        fields: List<String>,
    ): String =
        ContentIds()
            .id(domain) {
                long(incarnation)
                long(ordinal.updateAndGet { Math.addExact(it, 1L) })
                int(fields.size)
                fields.forEach(::text)
            }.contentHex()
}