package com.vanta.smsgateway

import android.content.Context
import android.telephony.SubscriptionInfo
import android.telephony.SubscriptionManager

object SubscriptionHelper {

    // Returns eSIM subId if found, else first active sim, else system default
    fun getESimSubId(context: Context): Int {
        val sm = context.getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE) as SubscriptionManager
        return try {
            val list: List<SubscriptionInfo> = sm.activeSubscriptionInfoList ?: emptyList()
            val esim = list.firstOrNull { it.isEmbedded }
            esim?.subscriptionId
                ?: list.firstOrNull()?.subscriptionId
                ?: SubscriptionManager.getDefaultSmsSubscriptionId()
        } catch (_: SecurityException) {
            SubscriptionManager.getDefaultSmsSubscriptionId()
        }
    }

    fun describe(context: Context): String {
        val sm = context.getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE) as SubscriptionManager
        return try {
            val list = sm.activeSubscriptionInfoList ?: emptyList()
            if (list.isEmpty()) return "No active SIMs"
            list.joinToString(" | ") {
                "${if (it.isEmbedded) "eSIM" else "SIM${it.simSlotIndex + 1}"}: ${it.displayName}"
            }
        } catch (_: SecurityException) { "Permission denied" }
    }
}