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477 lines
13 KiB
C++
477 lines
13 KiB
C++
/*
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* DefenceBehavior.cpp, part of VCMI engine
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*
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* Authors: listed in file AUTHORS in main folder
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*
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* License: GNU General Public License v2.0 or later
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* Full text of license available in license.txt file, in main folder
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*
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*/
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#include "StdInc.h"
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#include "DefenceBehavior.h"
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#include "../AIGateway.h"
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#include "../Engine/Nullkiller.h"
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#include "../AIUtility.h"
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#include "../Goals/BuyArmy.h"
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#include "../Goals/ExecuteHeroChain.h"
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#include "../Behaviors/CaptureObjectsBehavior.h"
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#include "../Goals/RecruitHero.h"
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#include "../Goals/DismissHero.h"
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#include "../Goals/Composition.h"
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#include "../Goals/CaptureObject.h"
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#include "../Markers/DefendTown.h"
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#include "../Goals/ExchangeSwapTownHeroes.h"
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namespace NKAI
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{
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const float THREAT_IGNORE_RATIO = 2;
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using namespace Goals;
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std::string DefenceBehavior::toString() const
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{
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return "Defend towns";
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}
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Goals::TGoalVec DefenceBehavior::decompose(const Nullkiller * ai) const
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{
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Goals::TGoalVec tasks;
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for(auto town : ai->cb->getTownsInfo())
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{
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evaluateDefence(tasks, town, ai);
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}
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return tasks;
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}
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bool isThreatUnderControl(const CGTownInstance * town, const HitMapInfo & threat, const Nullkiller * ai, const std::vector<AIPath> & paths)
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{
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int dayOfWeek = ai->cb->getDate(Date::DAY_OF_WEEK);
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for(const AIPath & path : paths)
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{
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bool threatIsWeak = path.getHeroStrength() / (float)threat.danger > THREAT_IGNORE_RATIO;
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bool needToSaveGrowth = threat.turn == 0 && dayOfWeek == 7;
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if(threatIsWeak && !needToSaveGrowth)
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{
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if((path.exchangeCount == 1 && path.turn() < threat.turn)
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|| path.turn() < threat.turn - 1
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|| (path.turn() < threat.turn && threat.turn >= 2))
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{
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace(
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"Hero %s can eliminate danger for town %s using path %s.",
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path.targetHero->getObjectName(),
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town->getObjectName(),
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path.toString());
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#endif
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return true;
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}
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}
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}
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return false;
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}
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void handleCounterAttack(
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const CGTownInstance * town,
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const HitMapInfo & threat,
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const HitMapInfo & maximumDanger,
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const Nullkiller * ai,
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Goals::TGoalVec & tasks)
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{
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if(threat.hero.validAndSet()
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&& threat.turn <= 1
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&& (threat.danger == maximumDanger.danger || threat.turn < maximumDanger.turn))
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{
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auto heroCapturingPaths = ai->pathfinder->getPathInfo(threat.hero->visitablePos());
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auto goals = CaptureObjectsBehavior::getVisitGoals(heroCapturingPaths, ai, threat.hero.get());
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for(int i = 0; i < heroCapturingPaths.size(); i++)
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{
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AIPath & path = heroCapturingPaths[i];
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TSubgoal goal = goals[i];
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if(!goal || goal->invalid() || !goal->isElementar()) continue;
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Composition composition;
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composition.addNext(DefendTown(town, threat, path, true)).addNext(goal);
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tasks.push_back(Goals::sptr(composition));
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}
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}
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}
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bool handleGarrisonHeroFromPreviousTurn(const CGTownInstance * town, Goals::TGoalVec & tasks, const Nullkiller * ai)
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{
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if(ai->isHeroLocked(town->garrisonHero.get()))
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{
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logAi->trace(
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"Hero %s in garrison of town %s is supposed to defend the town",
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town->garrisonHero->getNameTranslated(),
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town->getNameTranslated());
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return true;
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}
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if(!town->visitingHero)
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{
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if(ai->cb->getHeroCount(ai->playerID, false) < GameConstants::MAX_HEROES_PER_PLAYER)
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{
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logAi->trace(
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"Extracting hero %s from garrison of town %s",
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town->garrisonHero->getNameTranslated(),
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town->getNameTranslated());
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tasks.push_back(Goals::sptr(Goals::ExchangeSwapTownHeroes(town, nullptr).setpriority(5)));
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return true;
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}
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else if(ai->heroManager->getHeroRole(town->garrisonHero.get()) == HeroRole::MAIN)
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{
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auto armyDismissLimit = 1000;
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auto heroToDismiss = ai->heroManager->findWeakHeroToDismiss(armyDismissLimit);
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if(heroToDismiss)
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{
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tasks.push_back(Goals::sptr(Goals::DismissHero(heroToDismiss).setpriority(5)));
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return true;
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}
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}
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}
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return false;
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}
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void DefenceBehavior::evaluateDefence(Goals::TGoalVec & tasks, const CGTownInstance * town, const Nullkiller * ai) const
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{
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logAi->trace("Evaluating defence for %s", town->getNameTranslated());
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auto threatNode = ai->dangerHitMap->getObjectThreat(town);
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std::vector<HitMapInfo> threats = ai->dangerHitMap->getTownThreats(town);
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threats.push_back(threatNode.fastestDanger); // no guarantee that fastest danger will be there
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if(town->garrisonHero && handleGarrisonHeroFromPreviousTurn(town, tasks, ai))
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{
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return;
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}
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if(!threatNode.fastestDanger.hero)
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{
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logAi->trace("No threat found for town %s", town->getNameTranslated());
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return;
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}
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uint64_t reinforcement = ai->armyManager->howManyReinforcementsCanBuy(town->getUpperArmy(), town);
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if(reinforcement)
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{
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logAi->trace("Town %s can buy defence army %lld", town->getNameTranslated(), reinforcement);
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tasks.push_back(Goals::sptr(Goals::BuyArmy(town, reinforcement).setpriority(0.5f)));
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}
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auto paths = ai->pathfinder->getPathInfo(town->visitablePos());
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for(auto & threat : threats)
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{
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logAi->trace(
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"Town %s has threat %lld in %s turns, hero: %s",
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town->getNameTranslated(),
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threat.danger,
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std::to_string(threat.turn),
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threat.hero ? threat.hero->getNameTranslated() : std::string("<no hero>"));
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handleCounterAttack(town, threat, threatNode.maximumDanger, ai, tasks);
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if(isThreatUnderControl(town, threat, ai, paths))
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{
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continue;
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}
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evaluateRecruitingHero(tasks, threat, town, ai);
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if(paths.empty())
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{
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logAi->trace("No ways to defend town %s", town->getNameTranslated());
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continue;
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}
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std::vector<int> pathsToDefend;
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std::map<const CGHeroInstance *, std::vector<int>> defferedPaths;
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for(int i = 0; i < paths.size(); i++)
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{
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auto & path = paths[i];
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace(
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"Hero %s can defend town with force %lld in %s turns, cost: %f, path: %s",
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path.targetHero->getObjectName(),
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path.getHeroStrength(),
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std::to_string(path.turn()),
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path.movementCost(),
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path.toString());
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#endif
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auto townDefenseStrength = town->garrisonHero
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? town->garrisonHero->getTotalStrength()
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: (town->visitingHero ? town->visitingHero->getTotalStrength() : town->getUpperArmy()->getArmyStrength());
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if(town->visitingHero && path.targetHero == town->visitingHero.get())
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{
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if(path.getHeroStrength() < townDefenseStrength)
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continue;
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}
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else if(town->garrisonHero && path.targetHero == town->garrisonHero.get())
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{
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if(path.getHeroStrength() < townDefenseStrength)
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continue;
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}
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if(path.turn() <= threat.turn - 2)
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{
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Defer defence of %s by %s because he has enough time to reach the town next turn",
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town->getObjectName(),
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path.targetHero->getObjectName());
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#endif
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defferedPaths[path.targetHero].push_back(i);
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continue;
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}
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if(path.targetHero == town->visitingHero.get() && path.exchangeCount == 1)
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{
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Put %s to garrison of town %s",
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path.targetHero->getObjectName(),
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town->getObjectName());
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#endif
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// dismiss creatures we are not able to pick to be able to hide in garrison
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if(town->garrisonHero
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|| town->getUpperArmy()->stacksCount() == 0
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|| (town->getUpperArmy()->getArmyStrength() < 500 && town->fortLevel() >= CGTownInstance::CITADEL))
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{
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tasks.push_back(
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Goals::sptr(Composition()
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.addNext(DefendTown(town, threat, path.targetHero))
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.addNext(ExchangeSwapTownHeroes(town, town->visitingHero.get(), HeroLockedReason::DEFENCE))));
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}
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continue;
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}
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// main without army and visiting scout with army, very specific case
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if(town->visitingHero && town->getUpperArmy()->stacksCount() == 0
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&& path.targetHero != town->visitingHero.get() && path.exchangeCount == 1 && path.turn() == 0
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&& ai->heroManager->evaluateHero(path.targetHero) > ai->heroManager->evaluateHero(town->visitingHero.get())
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&& 10 * path.targetHero->getTotalStrength() < town->visitingHero->getTotalStrength())
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{
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path.heroArmy = town->visitingHero.get();
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tasks.push_back(
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Goals::sptr(Composition()
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.addNext(DefendTown(town, threat, path))
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.addNextSequence({
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sptr(ExchangeSwapTownHeroes(town, town->visitingHero.get())),
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sptr(ExecuteHeroChain(path, town)),
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sptr(ExchangeSwapTownHeroes(town, path.targetHero, HeroLockedReason::DEFENCE))
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})));
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continue;
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}
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if(threat.turn == 0 || (path.turn() <= threat.turn && path.getHeroStrength() * SAFE_ATTACK_CONSTANT >= threat.danger))
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{
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if(ai->arePathHeroesLocked(path))
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{
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Can not move %s to defend town %s. Path is locked.",
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path.targetHero->getObjectName(),
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town->getObjectName());
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#endif
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continue;
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}
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pathsToDefend.push_back(i);
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}
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}
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for(int i : pathsToDefend)
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{
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AIPath & path = paths[i];
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for(int j : defferedPaths[path.targetHero])
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{
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AIPath & defferedPath = paths[j];
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if(defferedPath.getHeroStrength() >= path.getHeroStrength()
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&& defferedPath.turn() <= path.turn())
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{
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continue;
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}
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}
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Composition composition;
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composition.addNext(DefendTown(town, threat, path));
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TGoalVec sequence;
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if(town->garrisonHero && path.targetHero == town->garrisonHero.get() && path.exchangeCount == 1)
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{
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composition.addNext(ExchangeSwapTownHeroes(town, town->garrisonHero.get(), HeroLockedReason::DEFENCE));
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tasks.push_back(Goals::sptr(composition));
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Locking hero %s in garrison of %s",
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town->garrisonHero.get()->getObjectName(),
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town->getObjectName());
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#endif
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continue;
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}
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else if(town->visitingHero && path.targetHero != town->visitingHero && !path.containsHero(town->visitingHero))
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{
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if(town->garrisonHero)
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{
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if(ai->heroManager->getHeroRole(town->visitingHero.get()) == HeroRole::SCOUT
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&& town->visitingHero->getArmyStrength() < path.heroArmy->getArmyStrength() / 20)
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{
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if(path.turn() == 0)
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sequence.push_back(sptr(DismissHero(town->visitingHero.get())));
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}
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else
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{
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Cancel moving %s to defend town %s as the town has garrison hero",
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path.targetHero->getObjectName(),
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town->getObjectName());
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#endif
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continue;
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}
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}
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else if(path.turn() == 0)
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{
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sequence.push_back(sptr(ExchangeSwapTownHeroes(town, town->visitingHero.get())));
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}
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}
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Move %s to defend town %s",
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path.targetHero->getObjectName(),
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town->getObjectName());
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#endif
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sequence.push_back(sptr(ExecuteHeroChain(path, town)));
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composition.addNextSequence(sequence);
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auto firstBlockedAction = path.getFirstBlockedAction();
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if(firstBlockedAction)
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{
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auto subGoal = firstBlockedAction->decompose(ai, path.targetHero);
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#if NKAI_TRACE_LEVEL >= 2
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logAi->trace("Decomposing special action %s returns %s", firstBlockedAction->toString(), subGoal->toString());
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#endif
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if(subGoal->invalid())
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{
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Path is invalid. Skipping");
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#endif
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continue;
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}
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composition.addNext(subGoal);
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}
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tasks.push_back(Goals::sptr(composition));
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}
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}
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logAi->debug("Found %d tasks", tasks.size());
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}
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void DefenceBehavior::evaluateRecruitingHero(Goals::TGoalVec & tasks, const HitMapInfo & threat, const CGTownInstance * town, const Nullkiller * ai) const
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{
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if(town->hasBuilt(BuildingID::TAVERN)
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&& ai->cb->getResourceAmount(EGameResID::GOLD) > GameConstants::HERO_GOLD_COST)
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{
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auto heroesInTavern = ai->cb->getAvailableHeroes(town);
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for(auto hero : heroesInTavern)
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{
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if(hero->getTotalStrength() < threat.danger)
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continue;
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auto myHeroes = ai->cb->getHeroesInfo();
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#if NKAI_TRACE_LEVEL >= 1
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logAi->trace("Hero %s can be recruited to defend %s", hero->getObjectName(), town->getObjectName());
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#endif
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bool needSwap = false;
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const CGHeroInstance * heroToDismiss = nullptr;
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if(town->visitingHero)
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{
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if(!town->garrisonHero)
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needSwap = true;
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else
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{
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if(town->visitingHero->getArmyStrength() < town->garrisonHero->getArmyStrength())
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{
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if(town->visitingHero->getArmyStrength() >= hero->getArmyStrength())
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continue;
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heroToDismiss = town->visitingHero.get();
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}
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else if(town->garrisonHero->getArmyStrength() >= hero->getArmyStrength())
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continue;
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else
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{
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needSwap = true;
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heroToDismiss = town->garrisonHero.get();
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}
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}
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// avoid dismissing one weak hero in order to recruit another.
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if(heroToDismiss && heroToDismiss->getArmyStrength() + 500 > hero->getArmyStrength())
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continue;
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}
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else if(ai->heroManager->heroCapReached())
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{
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heroToDismiss = ai->heroManager->findWeakHeroToDismiss(hero->getArmyStrength());
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if(!heroToDismiss)
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continue;
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}
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TGoalVec sequence;
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Goals::Composition recruitHeroComposition;
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if(needSwap)
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sequence.push_back(sptr(ExchangeSwapTownHeroes(town, town->visitingHero.get())));
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if(heroToDismiss)
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sequence.push_back(sptr(DismissHero(heroToDismiss)));
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sequence.push_back(sptr(Goals::RecruitHero(town, hero)));
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tasks.push_back(sptr(Goals::Composition().addNext(DefendTown(town, threat, hero)).addNextSequence(sequence)));
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}
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}
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}
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}
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