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Diffstat (limited to 'wallet/src/main/java/net/taler/wallet/balances/BalanceManager.kt')
| -rw-r--r-- | wallet/src/main/java/net/taler/wallet/balances/BalanceManager.kt | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/wallet/src/main/java/net/taler/wallet/balances/BalanceManager.kt b/wallet/src/main/java/net/taler/wallet/balances/BalanceManager.kt new file mode 100644 index 0000000..42e67cf --- /dev/null +++ b/wallet/src/main/java/net/taler/wallet/balances/BalanceManager.kt @@ -0,0 +1,137 @@ +/* + * This file is part of GNU Taler + * (C) 2024 Taler Systems S.A. + * + * GNU Taler is free software; you can redistribute it and/or modify it under the + * terms of the GNU General Public License as published by the Free Software + * Foundation; either version 3, or (at your option) any later version. + * + * GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR + * A PARTICULAR PURPOSE. See the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along with + * GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/> + */ + +package net.taler.wallet.balances + +import android.util.Log +import androidx.annotation.UiThread +import androidx.lifecycle.LiveData +import androidx.lifecycle.MutableLiveData +import androidx.lifecycle.distinctUntilChanged +import kotlinx.coroutines.CoroutineScope +import kotlinx.coroutines.launch +import kotlinx.serialization.Serializable +import kotlinx.serialization.encodeToString +import kotlinx.serialization.json.Json +import net.taler.common.CurrencySpecification +import net.taler.wallet.TAG +import net.taler.wallet.backend.TalerErrorInfo +import net.taler.wallet.backend.WalletBackendApi +import org.json.JSONObject + +@Serializable +data class BalanceResponse( + val balances: List<BalanceItem> +) + +@Serializable +data class GetCurrencySpecificationResponse( + val currencySpecification: CurrencySpecification, +) + +sealed class BalanceState { + data object None: BalanceState() + data object Loading: BalanceState() + + data class Success( + val balances: List<BalanceItem>, + ): BalanceState() + + data class Error( + val error: TalerErrorInfo, + ): BalanceState() +} + +class BalanceManager( + private val api: WalletBackendApi, + private val scope: CoroutineScope, +) { + private val mBalances = MutableLiveData<List<BalanceItem>>(emptyList()) + val balances: LiveData<List<BalanceItem>> = mBalances + + private val mState = MutableLiveData<BalanceState>(BalanceState.None) + val state: LiveData<BalanceState> = mState.distinctUntilChanged() + + private val currencySpecs: MutableMap<ScopeInfo, CurrencySpecification?> = mutableMapOf() + + @UiThread + fun loadBalances() { + mState.value = BalanceState.Loading + scope.launch { + val response = api.request("getBalances", BalanceResponse.serializer()) + response.onError { + Log.e(TAG, "Error retrieving balances: $it") + mState.postValue(BalanceState.Error(it)) + } + response.onSuccess { + mBalances.postValue(it.balances) + scope.launch { + // Fetch missing currency specs for all balances + it.balances.forEach { balance -> + if (!currencySpecs.containsKey(balance.scopeInfo)) { + currencySpecs[balance.scopeInfo] = getCurrencySpecification(balance.scopeInfo) + } + } + + mState.postValue( + BalanceState.Success(it.balances.map { balance -> + val spec = currencySpecs[balance.scopeInfo] + balance.copy( + available = balance.available.withSpec(spec), + pendingIncoming = balance.pendingIncoming.withSpec(spec), + pendingOutgoing = balance.pendingOutgoing.withSpec(spec), + ) + }), + ) + } + } + } + } + + private suspend fun getCurrencySpecification(scopeInfo: ScopeInfo): CurrencySpecification? { + var spec: CurrencySpecification? = null + api.request("getCurrencySpecification", GetCurrencySpecificationResponse.serializer()) { + val json = Json.encodeToString(scopeInfo) + Log.d(TAG, "BalanceManager: $json") + put("scope", JSONObject(json)) + }.onSuccess { + spec = it.currencySpecification + }.onError { + Log.e(TAG, "Error getting currency spec for scope $scopeInfo: $it") + } + + return spec + } + + @Deprecated("Please find spec via scopeInfo instead", ReplaceWith("getSpecForScopeInfo")) + fun getSpecForCurrency(currency: String): CurrencySpecification? { + val state = mState.value + if (state !is BalanceState.Success) return null + + return state.balances.find { it.currency == currency }?.available?.spec + } + + fun getSpecForScopeInfo(scopeInfo: ScopeInfo): CurrencySpecification? { + val state = mState.value + if (state !is BalanceState.Success) return null + + return state.balances.find { it.scopeInfo == scopeInfo }?.available?.spec + } + + fun resetBalances() { + mState.value = BalanceState.None + } +}
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