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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.merchantpos.order
import androidx.annotation.UiThread
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.Transformations
import net.taler.common.CombinedLiveData
import net.taler.lib.common.Amount
import net.taler.merchantpos.config.Category
import net.taler.merchantpos.config.ConfigProduct
import net.taler.merchantpos.order.RestartState.DISABLED
import net.taler.merchantpos.order.RestartState.ENABLED
import net.taler.merchantpos.order.RestartState.UNDO
internal enum class RestartState { ENABLED, DISABLED, UNDO }
internal interface LiveOrder {
val order: LiveData<Order>
val orderTotal: LiveData<Amount>
val restartState: LiveData<RestartState>
val modifyOrderAllowed: LiveData<Boolean>
val lastAddedProduct: ConfigProduct?
val selectedProductKey: String?
fun restartOrUndo()
fun selectOrderLine(product: ConfigProduct?)
fun increaseSelectedOrderLine()
fun decreaseSelectedOrderLine()
}
internal class MutableLiveOrder(
val id: Int,
private val currency: String,
private val productsByCategory: HashMap<Category, ArrayList<ConfigProduct>>
) : LiveOrder {
private val availableCategories: Map<Int, Category>
get() = productsByCategory.keys.map { it.id to it }.toMap()
override val order: MutableLiveData<Order> =
MutableLiveData(Order(id, currency, availableCategories))
override val orderTotal: LiveData<Amount> = Transformations.map(order) { it.total }
override val restartState = MutableLiveData(DISABLED)
private val selectedOrderLine = MutableLiveData<ConfigProduct>()
override val selectedProductKey: String?
get() = selectedOrderLine.value?.id
override val modifyOrderAllowed =
CombinedLiveData(restartState, selectedOrderLine) { restartState, selectedOrderLine ->
restartState != DISABLED && selectedOrderLine != null
}
override var lastAddedProduct: ConfigProduct? = null
private var undoOrder: Order? = null
@UiThread
internal fun addProduct(product: ConfigProduct) {
lastAddedProduct = product
order.value = order.value!! + product
restartState.value = ENABLED
}
@UiThread
internal fun removeProduct(product: ConfigProduct) {
val modifiedOrder = order.value!! - product
order.value = modifiedOrder
restartState.value = if (modifiedOrder.products.isEmpty()) DISABLED else ENABLED
}
@UiThread
internal fun isEmpty() = order.value!!.products.isEmpty()
@UiThread
override fun restartOrUndo() {
if (restartState.value == UNDO) {
order.value = undoOrder
restartState.value = ENABLED
undoOrder = null
} else {
undoOrder = order.value
order.value = Order(id, currency, availableCategories)
restartState.value = UNDO
}
}
@UiThread
override fun selectOrderLine(product: ConfigProduct?) {
selectedOrderLine.value = product
}
@UiThread
override fun increaseSelectedOrderLine() {
val orderLine = selectedOrderLine.value ?: throw IllegalStateException()
addProduct(orderLine)
}
@UiThread
override fun decreaseSelectedOrderLine() {
val orderLine = selectedOrderLine.value ?: throw IllegalStateException()
removeProduct(orderLine)
}
}
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