package com.dmc.callcrm.data

import android.Manifest
import android.annotation.SuppressLint
import android.content.Context
import android.content.pm.PackageManager
import android.os.Build
import android.telephony.SubscriptionManager
import androidx.core.content.ContextCompat

data class SimInfo(
    val slotIndex: Int,
    val subscriptionId: Int,
    val carrier: String,
    val number: String?      // often null on modern Android; user types it manually
)

object SimHelper {

    private fun hasPhonePerm(ctx: Context) =
        ContextCompat.checkSelfPermission(ctx, Manifest.permission.READ_PHONE_STATE) ==
            PackageManager.PERMISSION_GRANTED

    @SuppressLint("MissingPermission")
    fun listSims(ctx: Context): List<SimInfo> {
        if (!hasPhonePerm(ctx)) return emptyList()
        val sm = ContextCompat.getSystemService(ctx, SubscriptionManager::class.java)
            ?: return emptyList()
        val subs = try { sm.activeSubscriptionInfoList } catch (e: SecurityException) { null }
            ?: return emptyList()

        return subs.map { s ->
            val number = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
                // getNumber may still be empty depending on carrier
                try { s.number } catch (e: Exception) { null }
            } else {
                @Suppress("DEPRECATION") s.number
            }
            SimInfo(
                slotIndex = s.simSlotIndex,
                subscriptionId = s.subscriptionId,
                carrier = s.carrierName?.toString() ?: "SIM ${s.simSlotIndex + 1}",
                number = number?.ifBlank { null }
            )
        }.sortedBy { it.slotIndex }
    }
}