package link.roadio.riff.userstate.android

import android.icu.lang.UCharacter
import android.icu.text.BreakIterator
import android.icu.text.Normalizer2
import link.roadio.riff.userstate.model.ProfileStateModel
import java.util.Locale

/** Android's existing Unicode naming semantics are shared by ingress and accepted-snapshot reads. */
object AndroidUserStateValidation {
    fun canonicalName(name: String): String {
        require(name.isNotBlank() && name == name.trim())
        val iterator = BreakIterator.getCharacterInstance(Locale.ROOT).apply { setText(name) }
        var count = 0
        while (iterator.next() != BreakIterator.DONE) require(++count <= 120) { "Queue name exceeds 120 grapheme clusters" }
        return UCharacter.foldCase(Normalizer2.getNFKCInstance().normalize(name), true)
    }

    fun profile(profile: ProfileStateModel) {
        val names = profile.savedQueues.filter { it.kind == 0 }.map { canonicalName(checkNotNull(it.name)) }
        require(names.toSet().size == names.size) { "Duplicate Music playlist name" }
        profile.savedQueues.filter { it.kind == 1 }.forEach { canonicalName(checkNotNull(it.name)) }
    }
}