Fix production alternative duplicates

Having twice the same choice wasn't supported so far.
This can happen with Alexandria's bonuses (4 primary resources, or 3 secondary)
associated to the yellow Market/Caravansery cards.

Resolves:
https://github.com/joffrey-bion/seven-wonders/issues/19

4 files changed, 10 insertions, 9 deletions

diff --git a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/converters/Boards.kt b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/converters/Boards.kt
index 7ff870cf..0d8369ac 100644
--- a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/converters/Boards.kt
+++ b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/converters/Boards.kt
@@ -73,7 +73,7 @@ internal fun InternalWonderStage.toApiWonderStage(isLastBuiltStage: Boolean, las
 internal fun InternalProduction.toApiProduction(): ApiProduction =
     ApiProduction(
         fixedResources = getFixedResources().toCountedResourcesList(),
-        alternativeResources = getAlternativeResources()
+        alternativeResources = getAlternativeResources().sortedBy { it.size }
     )
 
 internal fun InternalRequirements.toApiRequirements(): ApiRequirements =
diff --git a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/data/serializers/ProductionSerializer.kt b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/data/serializers/ProductionSerializer.kt
index 467b0912..c98f20a8 100644
--- a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/data/serializers/ProductionSerializer.kt
+++ b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/data/serializers/ProductionSerializer.kt
@@ -24,14 +24,14 @@ internal class ProductionSerializer : JsonSerializer<Production>, JsonDeserializ
         }
     }
 
-    private fun serializeAsChoice(choices: Set<Set<ResourceType>>, context: JsonSerializationContext): JsonElement {
+    private fun serializeAsChoice(choices: List<Set<ResourceType>>, context: JsonSerializationContext): JsonElement {
         if (choices.isEmpty()) {
             return JsonNull.INSTANCE
         }
         if (choices.size > 1) {
             throw IllegalArgumentException("Cannot serialize a production with more than one choice")
         }
-        val str = choices.flatten().map { it.symbol }.joinToString("/")
+        val str = choices[0].map { it.symbol }.joinToString("/")
         return context.serialize(str)
     }
 
diff --git a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/BestPriceCalculator.kt b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/BestPriceCalculator.kt
index 85b07a80..dd2d2cae 100644
--- a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/BestPriceCalculator.kt
+++ b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/BestPriceCalculator.kt
@@ -15,7 +15,7 @@ data class TransactionPlan(val price: Int, val possibleTransactions: Set<Resourc
 private class ResourcePool(
     val provider: Provider?,
     private val rules: TradingRules,
-    choices: Set<Set<ResourceType>>
+    choices: List<Set<ResourceType>>
 ) {
     val choices: Set<MutableSet<ResourceType>> = choices.mapTo(HashSet()) { it.toMutableSet() }
 
diff --git a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/Production.kt b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/Production.kt
index 46ec66f7..4f9bbe90 100644
--- a/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/Production.kt
+++ b/sw-engine/src/main/kotlin/org/luxons/sevenwonders/engine/resources/Production.kt
@@ -5,11 +5,12 @@ import java.util.EnumSet
 
 data class Production internal constructor(
     private val fixedResources: MutableResources = mutableResourcesOf(),
-    private val alternativeResources: MutableSet<Set<ResourceType>> = mutableSetOf()
+    // cannot be a Set because the same choices can be there multiple times
+    private val alternativeResources: MutableList<Set<ResourceType>> = mutableListOf()
 ) {
     fun getFixedResources(): Resources = fixedResources
 
-    fun getAlternativeResources(): Set<Set<ResourceType>> = alternativeResources
+    fun getAlternativeResources(): List<Set<ResourceType>> = alternativeResources
 
     fun addFixedResource(type: ResourceType, quantity: Int) = fixedResources.add(type, quantity)
 
@@ -25,8 +26,8 @@ data class Production internal constructor(
         alternativeResources.addAll(production.getAlternativeResources())
     }
 
-    internal fun asChoices(): Set<Set<ResourceType>> {
-        val fixedAsChoices = fixedResources.toList().mapTo(HashSet()) { EnumSet.of(it) }
+    internal fun asChoices(): List<Set<ResourceType>> {
+        val fixedAsChoices = fixedResources.toList().map { EnumSet.of(it) }
         return fixedAsChoices + alternativeResources
     }
 
@@ -42,7 +43,7 @@ data class Production internal constructor(
 
     private fun containedInAlternatives(
         resources: MutableResources,
-        alternatives: MutableSet<Set<ResourceType>>
+        alternatives: MutableList<Set<ResourceType>>
     ): Boolean {
         if (resources.isEmpty()) {
             return true