Rearrange code for pruchasing stuff.

core/src/com/unciv/logic/automation/NextTurnAutomation.kt

@@ -22,11 +22,23 @@ class NextTurnAutomation{
         exchangeLuxuries(civInfo)
         declareWar(civInfo)
         automateCityBombardment(civInfo)
+        buyBuildingOrUnit(civInfo)
         automateUnits(civInfo)
         reassignWorkedTiles(civInfo)
         trainSettler(civInfo)
     }
 
+    private fun buyBuildingOrUnit(civInfo: CivilizationInfo) {
+        //allow ai spending money to purchase building & unit. Buying staff has slightly lower priority than buying tech.
+        for (city in civInfo.cities.sortedByDescending{ it.population.population }) {
+            val construction = city.cityConstructions.getCurrentConstruction()
+            if (construction.canBePurchased()
+                    && city.civInfo.gold / 3 >= construction.getGoldCost(civInfo.policies.getAdoptedPolicies()) ) {
+                city.cityConstructions.purchaseBuilding(construction.name)
+            }
+        }
+    }
+
     private fun exchangeTechs(civInfo: CivilizationInfo) {
         val otherCivList = civInfo.diplomacy.values.map { it.otherCiv() }.
                 filter { it.playerType == PlayerType.AI && !it.isBarbarianCivilization() }.
@@ -51,7 +63,7 @@ class NextTurnAutomation{
                     tradeLogic.currentTrade.theirOffers.add(theirOffer)
                 } else {
                     //try to buy tech with money, not spending more than 1/3 of treasury
-                    if (ourGold / 3 >= theirValue)
+                    if (ourGold / 2 >= theirValue)
                     {
                         tradeLogic.currentTrade.ourOffers.add(TradeOffer("Gold".tr(), TradeType.Gold, 0, theirValue))
                         tradeLogic.currentTrade.theirOffers.add(theirOffer)
@@ -73,10 +85,14 @@ class NextTurnAutomation{
             val costs = techsGroups.keys.sorted()
 
             val tech: Technology
-            if (techsGroups[costs[0]]!!.size == 1 || costs.size == 1) {
-                tech = techsGroups[costs[0]]!!.getRandom()
+            val techsCheapest = techsGroups[costs[0]]!!
+            //Do not consider advanced techs if only one tech left in cheapest groupe
+            if (techsCheapest.size == 1 || costs.size == 1) {
+                tech = techsCheapest.getRandom()
             } else {
-                tech = (techsGroups[costs[0]]!! + techsGroups[costs[1]]!!).getRandom()
+                //Choose randomly between cheapest and second cheapest groupe
+                val techsAdvanced = techsGroups[costs[1]]!!
+                tech = (techsCheapest + techsAdvanced).getRandom()
             }
             civInfo.tech.techsToResearch.add(tech.name)
         }
@@ -199,4 +215,4 @@ class NextTurnAutomation{
         }
     }
 
-}
+}

core/src/com/unciv/logic/city/CityConstructions.kt

@@ -126,11 +126,6 @@ class CityConstructions {
         inProgressConstructions[currentConstruction] = inProgressConstructions[currentConstruction]!! + productionToAdd
     }
 
-    fun canBePruchasedWithGold(construction: IConstruction): Boolean {
-        return construction !is SpecialConstruction &&
-                !(construction is Building && construction.isWonder)
-    }
-
     fun nextTurn(cityStats: Stats) {
         var construction = getConstruction(currentConstruction)
         if(construction is SpecialConstruction) return
@@ -150,14 +145,6 @@ class CityConstructions {
         val productionCost = construction.getProductionCost(cityInfo.civInfo.policies.adoptedPolicies)
         if (inProgressConstructions[currentConstruction]!! >= productionCost) {
             constructionComplete(construction)
-
-            //allow ai spending money to purchase building & unit. Buying staff has slightly lower priority than buying tech.
-            while (cityInfo.civInfo.playerType == PlayerType.AI
-                    && cityInfo.population.population >= 5
-                    && canBePruchasedWithGold(getConstruction(currentConstruction))
-                    && cityInfo.civInfo.gold / 5 >= getConstruction(currentConstruction).getGoldCost(cityInfo.civInfo.policies.getAdoptedPolicies()) ) {
-                purchaseBuilding(currentConstruction)
-            }
         }
     }
 

core/src/com/unciv/logic/city/IConstruction.kt

@@ -8,6 +8,7 @@ interface IConstruction : INamed, ICivilopedia {
     fun getGoldCost(adoptedPolicies: HashSet<String>): Int
     fun isBuildable(construction: CityConstructions): Boolean
     fun postBuildEvent(construction: CityConstructions)  // Yes I'm hilarious.
+    fun canBePurchased(): Boolean
 }
 
 
@@ -35,6 +36,9 @@ open class SpecialConstruction(override var name: String, override val descripti
         }
     }
 
+    override fun canBePurchased(): Boolean {
+        return false
+    }
 
     override fun getProductionCost(adoptedPolicies: HashSet<String>): Int {
         throw Exception("Impossible!")

core/src/com/unciv/logic/trade/TradeLogic.kt

@@ -91,7 +91,7 @@ class TradeLogic(val ourCivilization:CivilizationInfo, val otherCivilization: Ci
                     return value
                 }
             }
-            TradeType.Technology -> return sqrt(GameBasics.Technologies[offer.name]!!.cost.toDouble()).toInt()*10
+            TradeType.Technology -> return sqrt(GameBasics.Technologies[offer.name]!!.cost.toDouble()).toInt()*20
             TradeType.Strategic_Resource -> {
                 if(otherCivIsRecieving) {
                     val resources = ourCivilization.getCivResourcesByName()
@@ -211,4 +211,4 @@ class TradeLogic(val ourCivilization:CivilizationInfo, val otherCivilization: Ci
         transferTrade(ourCivilization,otherCivilization,currentTrade)
         transferTrade(otherCivilization,ourCivilization,currentTrade.reverse())
     }
-}
+}

core/src/com/unciv/models/gamebasics/Building.kt

@@ -149,6 +149,9 @@ class Building : NamedStats(), IConstruction{
         return stats
     }
 
+    override fun canBePurchased(): Boolean {
+        return !isWonder
+    }
 
     override fun getProductionCost(adoptedPolicies: HashSet<String>): Int {
         return if (!isWonder && culture != 0f && adoptedPolicies.contains("Piety")) (cost * 0.85).toInt()

core/src/com/unciv/models/gamebasics/unit/BaseUnit.kt

@@ -81,6 +81,10 @@ class BaseUnit : INamed, IConstruction, ICivilopedia {
         return unit
     }
 
+    override fun canBePurchased(): Boolean {
+        return true
+    }
+
     override fun getProductionCost(adoptedPolicies: HashSet<String>): Int = cost
 
     override fun getGoldCost(adoptedPolicies: HashSet<String>): Int {

core/src/com/unciv/ui/cityscreen/ConstructionsTable.kt

@@ -8,7 +8,6 @@ import com.badlogic.gdx.scenes.scene2d.ui.Table
 import com.badlogic.gdx.scenes.scene2d.ui.TextButton
 import com.badlogic.gdx.utils.Align
 import com.unciv.logic.city.CityInfo
-import com.unciv.logic.city.IConstruction
 import com.unciv.logic.city.SpecialConstruction
 import com.unciv.models.gamebasics.Building
 import com.unciv.models.gamebasics.GameBasics
@@ -124,7 +123,7 @@ class ConstructionsTable(val cityScreen: CityScreen) : Table(CameraStageBaseScre
 
         row()
         val purchaseConstructionButton: TextButton
-        if (city.cityConstructions.canBePruchasedWithGold(construction)) {
+        if (construction.canBePurchased()) {
             val buildingGoldCost = construction.getGoldCost(city.civInfo.policies.getAdoptedPolicies())
             purchaseConstructionButton = TextButton("Buy for [$buildingGoldCost] gold".tr(), CameraStageBaseScreen.skin)
             purchaseConstructionButton.onClick("coin") {