yaotp/app/src/main/java/com/chameth/yaotp/viewmodel/OtpItemViewModel.kt

package com.chameth.yaotp.viewmodel

import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import com.chameth.yaotp.accounts.Account
import com.chameth.yaotp.algos.Otp
import com.chameth.yaotp.algos.currentTime
import kotlin.math.max

class OtpItemViewModel : ViewModel() {

    var account: Account? = null
    set(value) {
        value?.let {
            label.value = it.label
            otp.value = it.generateOtp()
            showTime.value = it.timeBased
            timeLeft.value = if (it.timeBased) "${calculateTimeLeft(otp.value?.expiresAt ?: 0)}s" else ""
        }
    }

    val label = MutableLiveData<String>()
    val otp = MutableLiveData<Otp>()
    val showTime = MutableLiveData<Boolean>()
    val timeLeft = MutableLiveData<String>()

    internal fun calculateTimeLeft(expiry: Long, currentTime: Long = currentTime())= max(0, expiry - currentTime)

}