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/*
* This file is part of GNU Taler
* (C) 2020 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.transactions
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.kotlin.readValue
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch
import net.taler.wallet.backend.WalletBackendApi
import net.taler.wallet.history.History
import net.taler.wallet.history.HistoryEvent
import org.json.JSONObject
sealed class TransactionsResult {
object Error : TransactionsResult()
class Success(val transactions: History) : TransactionsResult()
}
class TransactionManager(
private val walletBackendApi: WalletBackendApi,
private val scope: CoroutineScope,
private val mapper: ObjectMapper
) {
private val mProgress = MutableLiveData<Boolean>()
val progress: LiveData<Boolean> = mProgress
var selectedCurrency: String? = null
var selectedEvent: HistoryEvent? = null
private val mTransactions = MutableLiveData<TransactionsResult>()
val transactions: LiveData<TransactionsResult> = mTransactions
fun loadTransactions() {
mProgress.postValue(true)
walletBackendApi.sendRequest("getHistory", null) { isError, result ->
scope.launch(Dispatchers.Default) {
onTransactionsLoaded(isError, result)
}
}
}
private fun onTransactionsLoaded(isError: Boolean, result: JSONObject) {
if (isError) {
mTransactions.postValue(TransactionsResult.Error)
return
}
val transactions = History()
val json = result.getJSONArray("history")
val currency = selectedCurrency
for (i in 0 until json.length()) {
val event: HistoryEvent = mapper.readValue(json.getString(i))
if (event.showToUser && (currency == null || event.isCurrency(currency))) {
transactions.add(event)
}
}
transactions.reverse() // show latest first
mProgress.postValue(false)
mTransactions.postValue(TransactionsResult.Success(transactions))
}
}
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