/*
* 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
*/
package net.taler.wallet.transactions
import androidx.annotation.UiThread
import androidx.annotation.WorkerThread
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.switchMap
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 org.json.JSONObject
import java.util.HashMap
import java.util.LinkedList
sealed class TransactionsResult {
object Error : TransactionsResult()
class Success(val transactions: List) : TransactionsResult()
}
class TransactionManager(
private val walletBackendApi: WalletBackendApi,
private val scope: CoroutineScope,
private val mapper: ObjectMapper
) {
private val mProgress = MutableLiveData()
val progress: LiveData = mProgress
var selectedCurrency: String? = null
var selectedTransaction: Transaction? = null
val searchQuery = MutableLiveData(null)
private val allTransactions = HashMap>()
private val mTransactions = HashMap>()
val transactions: LiveData
@UiThread
get() = searchQuery.switchMap { query ->
val currency = selectedCurrency
check(currency != null) { "Did not select currency before getting transactions" }
loadTransactions(query)
mTransactions[currency]!! // non-null because filled in [loadTransactions]
}
@UiThread
fun loadTransactions(searchQuery: String? = null) {
val currency = selectedCurrency ?: return
val liveData = mTransactions.getOrPut(currency) { MutableLiveData() }
if (searchQuery == null && allTransactions.containsKey(currency)) {
liveData.value = TransactionsResult.Success(allTransactions[currency]!!)
}
if (liveData.value == null) mProgress.value = true
val request = JSONObject(mapOf("currency" to currency))
searchQuery?.let { request.put("search", it) }
walletBackendApi.sendRequest("getTransactions", request) { isError, result ->
if (isError) {
liveData.postValue(TransactionsResult.Error)
mProgress.postValue(false)
} else {
val currencyToUpdate = if (searchQuery == null) currency else null
scope.launch(Dispatchers.Default) {
onTransactionsLoaded(liveData, currencyToUpdate, result)
}
}
}
}
@WorkerThread
private fun onTransactionsLoaded(
liveData: MutableLiveData,
currency: String?, // only non-null if we should update all transactions cache
result: JSONObject
) {
val transactionsArray = result.getString("transactions")
val transactions: LinkedList = mapper.readValue(transactionsArray)
// TODO remove when fixed in wallet-core
transactions.sortWith(compareBy({ it.pending }, { it.timestamp.ms }, { it.transactionId }))
transactions.reverse() // show latest first
mProgress.postValue(false)
liveData.postValue(TransactionsResult.Success(transactions))
// update all transactions on UiThread if there was a currency
currency?.let {
scope.launch(Dispatchers.Main) { allTransactions[currency] = transactions }
}
}
@UiThread
fun hasPending(currency: String): Boolean {
val result = mTransactions[currency]?.value ?: return false
return if (result is TransactionsResult.Success) {
result.transactions.any { it.pending }
} else false
}
}