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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.core.os.LocaleListCompat
+import com.fasterxml.jackson.annotation.JsonIgnore
+import com.fasterxml.jackson.annotation.JsonInclude
+import com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL
+import com.fasterxml.jackson.annotation.JsonProperty
+import net.taler.merchantpos.Amount
+import java.util.*
+import java.util.Locale.LanguageRange
+import kotlin.collections.ArrayList
+import kotlin.collections.HashMap
+
+data class Category(
+ val id: Int,
+ val name: String,
+ @JsonProperty("name_i18n")
+ val nameI18n: Map<String, String>?
+) {
+ var selected: Boolean = false
+ val localizedName: String get() = getLocalizedString(nameI18n, name)
+}
+
+@JsonInclude(NON_NULL)
+abstract class Product {
+ @get:JsonProperty("product_id")
+ abstract val productId: String?
+ abstract val description: String
+ @get:JsonProperty("description_i18n")
+ abstract val descriptionI18n: Map<String, String>?
+ abstract val price: String
+ @get:JsonProperty("delivery_location")
+ abstract val location: String?
+ abstract val image: String?
+ @get:JsonIgnore
+ val localizedDescription: String
+ get() = getLocalizedString(descriptionI18n, description)
+}
+
+data class ConfigProduct(
+ @JsonIgnore
+ val id: String = UUID.randomUUID().toString(),
+ override val productId: String?,
+ override val description: String,
+ override val descriptionI18n: Map<String, String>?,
+ override val price: String,
+ override val location: String?,
+ override val image: String?,
+ val categories: List<Int>,
+ @JsonIgnore
+ val quantity: Int = 0
+) : Product() {
+ val priceAsDouble by lazy { Amount.fromString(price).amount.toDouble() }
+
+ override fun equals(other: Any?) = other is ConfigProduct && id == other.id
+ override fun hashCode() = id.hashCode()
+}
+
+data class ContractProduct(
+ override val productId: String?,
+ override val description: String,
+ override val descriptionI18n: Map<String, String>?,
+ override val price: String,
+ override val location: String?,
+ override val image: String?,
+ val quantity: Int
+) : Product() {
+ constructor(product: ConfigProduct) : this(
+ product.productId,
+ product.description,
+ product.descriptionI18n,
+ product.price,
+ product.location,
+ product.image,
+ product.quantity
+ )
+}
+
+private fun getLocalizedString(map: Map<String, String>?, default: String): String {
+ // just return the default, if it is the only element
+ if (map == null) return default
+ // create a priority list of language ranges from system locales
+ val locales = LocaleListCompat.getDefault()
+ val priorityList = ArrayList<LanguageRange>(locales.size())
+ for (i in 0 until locales.size()) {
+ priorityList.add(LanguageRange(locales[i].toLanguageTag()))
+ }
+ // create a list of locales available in the given map
+ val availableLocales = map.keys.mapNotNull {
+ if (it == "_") return@mapNotNull null
+ val list = it.split("_")
+ when (list.size) {
+ 1 -> Locale(list[0])
+ 2 -> Locale(list[0], list[1])
+ 3 -> Locale(list[0], list[1], list[2])
+ else -> null
+ }
+ }
+ val match = Locale.lookup(priorityList, availableLocales)
+ return match?.toString()?.let { map[it] } ?: default
+}
+
+data class Order(val id: Int, val availableCategories: Map<Int, Category>) {
+ val products = ArrayList<ConfigProduct>()
+ val title: String = id.toString()
+ val summary: String
+ get() {
+ if (products.size == 1) return products[0].description
+ return getCategoryQuantities().map { (category: Category, quantity: Int) ->
+ "$quantity x ${category.localizedName}"
+ }.joinToString()
+ }
+ val total: Double
+ get() {
+ var total = 0.0
+ products.forEach { product ->
+ val price = product.priceAsDouble
+ total += price * product.quantity
+ }
+ return total
+ }
+ val totalAsString: String
+ get() = String.format("%.2f", total)
+
+ operator fun plus(product: ConfigProduct): Order {
+ val i = products.indexOf(product)
+ if (i == -1) {
+ products.add(product.copy(quantity = 1))
+ } else {
+ val quantity = products[i].quantity
+ products[i] = products[i].copy(quantity = quantity + 1)
+ }
+ return this
+ }
+
+ operator fun minus(product: ConfigProduct): Order {
+ val i = products.indexOf(product)
+ if (i == -1) return this
+ val quantity = products[i].quantity
+ if (quantity <= 1) {
+ products.remove(product)
+ } else {
+ products[i] = products[i].copy(quantity = quantity - 1)
+ }
+ return this
+ }
+
+ private fun getCategoryQuantities(): HashMap<Category, Int> {
+ val categories = HashMap<Category, Int>()
+ products.forEach { product ->
+ val categoryId = product.categories[0]
+ val category = availableCategories.getValue(categoryId)
+ val oldQuantity = categories[category] ?: 0
+ categories[category] = oldQuantity + product.quantity
+ }
+ return categories
+ }
+
+ /**
+ * Returns a map of i18n summaries for each locale present in *all* given [Category]s
+ * or null if there's no locale that fulfills this criteria.
+ */
+ val summaryI18n: Map<String, String>?
+ get() {
+ if (products.size == 1) return products[0].descriptionI18n
+ val categoryQuantities = getCategoryQuantities()
+ // get all available locales
+ val availableLocales = categoryQuantities.mapNotNull { (category, _) ->
+ val nameI18n = category.nameI18n
+ // if one category doesn't have locales, we can return null here already
+ nameI18n?.keys ?: return null
+ }.flatten().toHashSet()
+ // remove all locales not supported by all categories
+ categoryQuantities.forEach { (category, _) ->
+ // category.nameI18n should be non-null now
+ availableLocales.retainAll(category.nameI18n!!.keys)
+ if (availableLocales.isEmpty()) return null
+ }
+ return availableLocales.map { locale ->
+ Pair(
+ locale, categoryQuantities.map { (category, quantity) ->
+ // category.nameI18n should be non-null now
+ "$quantity x ${category.nameI18n!![locale]}"
+ }.joinToString()
+ )
+ }.toMap()
+ }
+
+}