First attempt to make per-difficulty configurations for AI

AI/Nullkiller/Engine/PriorityEvaluator.cpp

@@ -1349,7 +1349,8 @@ float PriorityEvaluator::evaluate(Goals::TSubgoal task, int priorityTier)
 	else
 	{
 		float score = 0;
-		float maxWillingToLose = ai->cb->getTownsInfo().empty() || (evaluationContext.isDefend && evaluationContext.threatTurns == 0) ? 1 : 0.25;
+		const bool amIInDanger = ai->cb->getTownsInfo().empty() || (evaluationContext.isDefend && evaluationContext.threatTurns == 0);
+		const float maxWillingToLose = amIInDanger ? 1 : ai->settings->getMaxArmyLossTarget();
 
 		bool arriveNextWeek = false;
 		if (ai->cb->getDate(Date::DAY_OF_WEEK) + evaluationContext.turn > 7)

AI/Nullkiller/Engine/Settings.cpp

@@ -54,6 +54,7 @@ namespace NKAI
 		maxGoldPressure = node["maxGoldPressure"].Float();
 		retreatThresholdRelative = node["retreatThresholdRelative"].Float();
 		retreatThresholdAbsolute = node["retreatThresholdAbsolute"].Float();
+		maxArmyLossTarget = node["maxArmyLossTarget"].Float();
 		safeAttackRatio = node["safeAttackRatio"].Float();
 		allowObjectGraph = node["allowObjectGraph"].Bool();
 		updateHitmapOnTileReveal = node["updateHitmapOnTileReveal"].Bool();

AI/Nullkiller/Engine/Settings.h

@@ -31,6 +31,7 @@ namespace NKAI
 		float retreatThresholdRelative;
 		float retreatThresholdAbsolute;
 		float safeAttackRatio;
+		float maxArmyLossTarget;
 		bool allowObjectGraph;
 		bool useTroopsFromGarrisons;
 		bool updateHitmapOnTileReveal;
@@ -45,6 +46,7 @@ namespace NKAI
 		float getRetreatThresholdRelative() const { return retreatThresholdRelative; }
 		float getRetreatThresholdAbsolute() const { return retreatThresholdAbsolute; }
 		float getSafeAttackRatio() const { return safeAttackRatio; }
+		float getMaxArmyLossTarget() const { return maxArmyLossTarget; }
 		int getMaxRoamingHeroes() const { return maxRoamingHeroes; }
 		int getMainHeroTurnDistanceLimit() const { return mainHeroTurnDistanceLimit; }
 		int getScoutHeroTurnDistanceLimit() const { return scoutHeroTurnDistanceLimit; }

config/ai/nkai/nkai-settings.json

@@ -1,60 +1,96 @@
 {
+	// "maxRoamingHeroes" - AI will never recruit new heroes above this value.
+	// Note that AI might end up with more heroes - due to prisons or if he has large number of heroes on start
+	//
+	// "maxpass" - ???
+	//
+	// "mainHeroTurnDistanceLimit" - AI will only run pathfinding for specified number of turns for his main hero. 
+	// "scoutHeroTurnDistanceLimit" - AI will only run pathfinding for specified number of turns for his secondary (scout) heroes
+	// Limiting this will make AI faster, but may result in AI being unable to discover objects outside of this range
+	//
+	// "maxGoldPressure" - ???
+	//
+	// "useTroopsFromGarrisons" - AI can take troops from garrisons on map. 
+	// Note that at the moment AI will not deliberately seek out such garrisons, he can only take troops from them when passing through.
+	// This option is always disabled on H3 RoE campaign maps to be in line with H3 AI
+	//
+	// "openMap" - AI will use map reveal cheat if cheats are enabled and AI is not allied with human player
+	// This improves AI decision making, but may lead AI to deliberately targeting targets that he should not be able to see at the moment
+	//
+	// "allowObjectGraph" - if used, AI will build "cache" for pathfinder on first turn, which should make AI faster. Requires openMap.
+	//
+	// "pathfinderBucketsCount" - ???
+	// "pathfinderBucketSize" - ???
+	//
+	// "retreatThresholdRelative" - AI will consider retreating from battle only if his troops are less than specified ratio compated to enemy
+	// "retreatThresholdAbsolute" - AI will consider retreating from battle only if total fight value of his troops are less than specified value
+	//
+	// "maxArmyLossTarget" - AI will try keep army loss below specified target
+	//
+	// "safeAttackRatio" - TODO: figure out how exactly it affects AI decision making
+	//
+	// "useFuzzy" - allow using of fuzzy logic. TODO: better description
+	
+	
 	"pawn" : {
-		"maxRoamingHeroes" : 8,
+		"maxRoamingHeroes" : 3,
 		"maxpass" : 30,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,
-		"openMap": false,
+		"openMap": true,
 		"allowObjectGraph": false,
 		"pathfinderBucketsCount" : 1, // old value: 3,
 		"pathfinderBucketSize" : 32, // old value: 7,
-		"retreatThresholdRelative" : 0.3,
-		"retreatThresholdAbsolute" : 10000,
+		"retreatThresholdRelative" : 0,
+		"retreatThresholdAbsolute" : 0,
 		"safeAttackRatio" : 1.1,
+		"maxArmyLossTarget" : 0.5,
 		"useFuzzy" : false
 	},
 	
 	"knight" : {
-		"maxRoamingHeroes" : 8,
+		"maxRoamingHeroes" : 3,
 		"maxpass" : 30,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,
-		"openMap": false,
+		"openMap": true,
 		"allowObjectGraph": false,
 		"pathfinderBucketsCount" : 1, // old value: 3,
 		"pathfinderBucketSize" : 32, // old value: 7,
-		"retreatThresholdRelative" : 0.3,
-		"retreatThresholdAbsolute" : 10000,
+		"retreatThresholdRelative" : 0.1,
+		"retreatThresholdAbsolute" : 5000,
 		"safeAttackRatio" : 1.1,
+		"maxArmyLossTarget" : 0.35,
 		"useFuzzy" : false
 	},
 	
 	"rook" : {
-		"maxRoamingHeroes" : 8,
+		"maxRoamingHeroes" : 4,
 		"maxpass" : 30,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
 		"maxGoldPressure" : 0.3,
 		"updateHitmapOnTileReveal" : false,
 		"useTroopsFromGarrisons" : true,
-		"openMap": false,
+		"openMap": true,
 		"allowObjectGraph": false,
 		"pathfinderBucketsCount" : 1, // old value: 3,
 		"pathfinderBucketSize" : 32, // old value: 7,
 		"retreatThresholdRelative" : 0.3,
 		"retreatThresholdAbsolute" : 10000,
 		"safeAttackRatio" : 1.1,
+		"maxArmyLossTarget" : 0.25,
 		"useFuzzy" : false
 	},
 	
 	"queen" : {
-		"maxRoamingHeroes" : 8,
+		"maxRoamingHeroes" : 6,
 		"maxpass" : 30,
 		"mainHeroTurnDistanceLimit" : 10,
 		"scoutHeroTurnDistanceLimit" : 5,
@@ -68,6 +104,7 @@
 		"retreatThresholdRelative" : 0.3,
 		"retreatThresholdAbsolute" : 10000,
 		"safeAttackRatio" : 1.1,
+		"maxArmyLossTarget" : 0.25,
 		"useFuzzy" : false
 	},
 	
@@ -86,6 +123,7 @@
 		"retreatThresholdRelative" : 0.3,
 		"retreatThresholdAbsolute" : 10000,
 		"safeAttackRatio" : 1.1,
+		"maxArmyLossTarget" : 0.25,
 		"useFuzzy" : false
 	}
 }