refactor: WalletViewModel BalancePrefs
This commit is contained in:
@@ -0,0 +1,67 @@
|
||||
package com.bitcointxoko.gudariwallet.data
|
||||
|
||||
import android.content.Context
|
||||
import android.content.SharedPreferences
|
||||
import androidx.core.content.edit
|
||||
import com.bitcointxoko.gudariwallet.util.WalletConstants
|
||||
|
||||
/**
|
||||
* Wraps the single SharedPreferences file used for persisting wallet UI state:
|
||||
* balance, balance visibility, fiat currency selection, fiat rates, and
|
||||
* lightning address.
|
||||
*
|
||||
* Passed into [WalletViewModel] instead of a raw [Context] so the ViewModel
|
||||
* holds no Android framework references.
|
||||
*/
|
||||
class BalancePrefsStore(context: Context) {
|
||||
|
||||
// Exposed to FiatRateCache so both share the same prefs file
|
||||
internal val prefs: SharedPreferences = context.getSharedPreferences(
|
||||
WalletConstants.BALANCE_PREFS_NAME, Context.MODE_PRIVATE
|
||||
)
|
||||
|
||||
// ── Balance ───────────────────────────────────────────────────────────────
|
||||
|
||||
val savedBalanceSats: Long
|
||||
get() = prefs.getLong(WalletConstants.BALANCE_PREFS_KEY, -1L)
|
||||
|
||||
val balanceSavedAt: Long
|
||||
get() = prefs.getLong(WalletConstants.BALANCE_PREFS_SAVED_AT, 0L)
|
||||
|
||||
fun persistBalance(sats: Long) {
|
||||
prefs.edit {
|
||||
putLong(WalletConstants.BALANCE_PREFS_KEY, sats)
|
||||
putLong(WalletConstants.BALANCE_PREFS_SAVED_AT, System.currentTimeMillis())
|
||||
}
|
||||
}
|
||||
|
||||
// ── Balance visibility ────────────────────────────────────────────────────
|
||||
|
||||
val isBalanceHidden: Boolean
|
||||
get() = prefs.getBoolean("balance_hidden", false)
|
||||
|
||||
fun setBalanceHidden(hidden: Boolean) {
|
||||
prefs.edit { putBoolean("balance_hidden", hidden) }
|
||||
}
|
||||
|
||||
// ── Fiat currency selection ───────────────────────────────────────────────
|
||||
|
||||
val selectedCurrency: String?
|
||||
get() = prefs.getString("fiat_currency", null)
|
||||
|
||||
fun setSelectedCurrency(currency: String?) {
|
||||
prefs.edit {
|
||||
if (currency != null) putString("fiat_currency", currency)
|
||||
else remove("fiat_currency")
|
||||
}
|
||||
}
|
||||
|
||||
// ── Lightning address ─────────────────────────────────────────────────────
|
||||
|
||||
val lightningAddress: String?
|
||||
get() = prefs.getString("lightning_address", null)
|
||||
|
||||
fun setLightningAddress(address: String) {
|
||||
prefs.edit { putString("lightning_address", address) }
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,109 @@
|
||||
package com.bitcointxoko.gudariwallet.data
|
||||
|
||||
import android.content.SharedPreferences
|
||||
import android.util.Log
|
||||
import androidx.core.content.edit
|
||||
import com.google.gson.Gson
|
||||
import com.google.gson.reflect.TypeToken
|
||||
|
||||
private const val TAG = "FiatRateCache"
|
||||
|
||||
/**
|
||||
* Two-tier (in-memory + SharedPreferences) cache for fiat exchange rates
|
||||
* and the supported-currency list.
|
||||
*
|
||||
* Receives the already-open [prefs] instance from [BalancePrefsStore] so that
|
||||
* all wallet prefs stay in a single file.
|
||||
*/
|
||||
class FiatRateCache(store: BalancePrefsStore) {
|
||||
private val prefs = store.prefs
|
||||
|
||||
// ── Rate ─────────────────────────────────────────────────────────────────
|
||||
|
||||
private var cachedRate : Double? = null
|
||||
private var rateLastFetchedAt : Long = 0L
|
||||
private var cachedRateCurrency : String = ""
|
||||
|
||||
/**
|
||||
* Returns a fresh in-memory rate for [currency] if it is younger than
|
||||
* [ttlMs], then falls back to the last persisted float, then returns null.
|
||||
*/
|
||||
fun getRate(currency: String, ttlMs: Long): Double? {
|
||||
val now = System.currentTimeMillis()
|
||||
val age = now - rateLastFetchedAt
|
||||
|
||||
if (cachedRate != null && cachedRateCurrency == currency && age < ttlMs) {
|
||||
Log.d(TAG, "FIAT [RATE CACHE ] $currency — in-memory hit (age ${age / 1000}s)")
|
||||
return cachedRate
|
||||
}
|
||||
|
||||
// Cold-start fallback: last persisted rate
|
||||
val persisted = prefs.getFloat("fiat_rate_$currency", 0f).toDouble()
|
||||
if (persisted > 0.0) {
|
||||
Log.d(TAG, "FIAT [RATE STALE ] $currency — using persisted rate $persisted")
|
||||
return persisted
|
||||
}
|
||||
|
||||
return null
|
||||
}
|
||||
|
||||
/**
|
||||
* Stores a freshly fetched [rate] for [currency] in memory and on disk.
|
||||
*/
|
||||
fun putRate(currency: String, rate: Double) {
|
||||
val now = System.currentTimeMillis()
|
||||
cachedRate = rate
|
||||
rateLastFetchedAt = now
|
||||
cachedRateCurrency = currency
|
||||
prefs.edit {
|
||||
putFloat("fiat_rate_$currency", rate.toFloat())
|
||||
putLong("fiat_rate_fetched_at_$currency", now)
|
||||
}
|
||||
Log.d(TAG, "FIAT [RATE FRESH ] 1 $currency = $rate sats — cached + persisted")
|
||||
}
|
||||
|
||||
/** Clears the in-memory rate (e.g. when the user switches currency). */
|
||||
fun invalidateRate() {
|
||||
cachedRate = null
|
||||
rateLastFetchedAt = 0L
|
||||
cachedRateCurrency = ""
|
||||
}
|
||||
|
||||
// ── Currency list ─────────────────────────────────────────────────────────
|
||||
|
||||
private var cachedCurrencies: List<String>? = null
|
||||
private val gson = Gson()
|
||||
|
||||
/**
|
||||
* Returns the cached currency list (memory → disk → null).
|
||||
* Callers are responsible for fetching from the network on a null result.
|
||||
*/
|
||||
fun getCurrencies(): List<String>? {
|
||||
cachedCurrencies?.let {
|
||||
Log.d(TAG, "FIAT [CURRENCIES] in-memory hit (${it.size} currencies)")
|
||||
return it
|
||||
}
|
||||
|
||||
val json = prefs.getString("fiat_currencies_json", null) ?: return null
|
||||
return runCatching {
|
||||
val type = object : TypeToken<List<String>>() {}.type
|
||||
val list: List<String> = gson.fromJson(json, type)
|
||||
Log.d(TAG, "FIAT [CURRENCIES] prefs hit (${list.size} currencies)")
|
||||
list.also { cachedCurrencies = it }
|
||||
}.getOrElse { e ->
|
||||
Log.w(TAG, "FIAT [CURRENCIES] prefs parse failed — ${e.message}")
|
||||
null
|
||||
}
|
||||
}
|
||||
|
||||
/** Stores [currencies] in memory and on disk. */
|
||||
fun putCurrencies(currencies: List<String>) {
|
||||
if (currencies.isEmpty()) return
|
||||
cachedCurrencies = currencies
|
||||
prefs.edit { putString("fiat_currencies_json", gson.toJson(currencies)) }
|
||||
Log.d(TAG, "FIAT [CURRENCIES] cached ${currencies.size} currencies")
|
||||
}
|
||||
|
||||
val currentRate: Double?
|
||||
get() = cachedRate.takeIf { cachedRateCurrency.isNotBlank() }
|
||||
}
|
||||
Reference in New Issue
Block a user