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241 lines
7.9 KiB
C++
241 lines
7.9 KiB
C++
/*
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* AttackPossibility.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 "AttackPossibility.h"
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#include "../../lib/CStack.h" // TODO: remove
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// Eventually only IBattleInfoCallback and battle::Unit should be used,
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// CUnitState should be private and CStack should be removed completely
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uint64_t averageDmg(const DamageRange & range)
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{
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return (range.min + range.max) / 2;
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}
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AttackPossibility::AttackPossibility(BattleHex from, BattleHex dest, const BattleAttackInfo & attack)
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: from(from), dest(dest), attack(attack)
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{
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}
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int64_t AttackPossibility::damageDiff() const
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{
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return defenderDamageReduce - attackerDamageReduce - collateralDamageReduce + shootersBlockedDmg;
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}
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int64_t AttackPossibility::attackValue() const
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{
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return damageDiff();
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}
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/// <summary>
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/// How enemy damage will be reduced by this attack
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/// Half bounty for kill, half for making damage equal to enemy health
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/// Bounty - the killed creature average damage calculated against attacker
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/// </summary>
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int64_t AttackPossibility::calculateDamageReduce(
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const battle::Unit * attacker,
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const battle::Unit * defender,
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uint64_t damageDealt,
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const CBattleInfoCallback & cb)
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{
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const float HEALTH_BOUNTY = 0.5;
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const float KILL_BOUNTY = 1.0 - HEALTH_BOUNTY;
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vstd::amin(damageDealt, defender->getAvailableHealth());
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// FIXME: provide distance info for Jousting bonus
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auto attackerUnitForMeasurement = attacker;
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if(attackerUnitForMeasurement->isTurret())
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{
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auto ourUnits = cb.battleGetUnitsIf([&](const battle::Unit * u) -> bool
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{
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return u->unitSide() == attacker->unitSide() && !u->isTurret();
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});
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if(ourUnits.empty())
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attackerUnitForMeasurement = defender;
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else
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attackerUnitForMeasurement = ourUnits.front();
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}
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auto enemyDamageBeforeAttack = cb.battleEstimateDamage(defender, attackerUnitForMeasurement, 0);
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auto enemiesKilled = damageDealt / defender->getMaxHealth() + (damageDealt % defender->getMaxHealth() >= defender->getFirstHPleft() ? 1 : 0);
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auto enemyDamage = averageDmg(enemyDamageBeforeAttack.damage);
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auto damagePerEnemy = enemyDamage / (double)defender->getCount();
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return (int64_t)(damagePerEnemy * (enemiesKilled * KILL_BOUNTY + damageDealt * HEALTH_BOUNTY / (double)defender->getMaxHealth()));
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}
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int64_t AttackPossibility::evaluateBlockedShootersDmg(const BattleAttackInfo & attackInfo, BattleHex hex, const HypotheticBattle & state)
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{
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int64_t res = 0;
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if(attackInfo.shooting)
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return 0;
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auto attacker = attackInfo.attacker;
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auto hexes = attacker->getSurroundingHexes(hex);
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for(BattleHex tile : hexes)
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{
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auto st = state.battleGetUnitByPos(tile, true);
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if(!st || !state.battleMatchOwner(st, attacker))
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continue;
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if(!state.battleCanShoot(st))
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continue;
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// FIXME: provide distance info for Jousting bonus
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BattleAttackInfo rangeAttackInfo(st, attacker, 0, true);
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rangeAttackInfo.defenderPos = hex;
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BattleAttackInfo meleeAttackInfo(st, attacker, 0, false);
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meleeAttackInfo.defenderPos = hex;
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auto rangeDmg = state.battleEstimateDamage(rangeAttackInfo);
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auto meleeDmg = state.battleEstimateDamage(meleeAttackInfo);
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int64_t gain = averageDmg(rangeDmg.damage) - averageDmg(meleeDmg.damage) + 1;
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res += gain;
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}
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return res;
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}
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AttackPossibility AttackPossibility::evaluate(const BattleAttackInfo & attackInfo, BattleHex hex, const HypotheticBattle & state)
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{
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auto attacker = attackInfo.attacker;
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auto defender = attackInfo.defender;
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const std::string cachingStringBlocksRetaliation = "type_BLOCKS_RETALIATION";
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static const auto selectorBlocksRetaliation = Selector::type()(BonusType::BLOCKS_RETALIATION);
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const auto attackerSide = state.playerToSide(state.battleGetOwner(attacker));
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const bool counterAttacksBlocked = attacker->hasBonus(selectorBlocksRetaliation, cachingStringBlocksRetaliation);
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AttackPossibility bestAp(hex, BattleHex::INVALID, attackInfo);
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std::vector<BattleHex> defenderHex;
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if(attackInfo.shooting)
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defenderHex = defender->getHexes();
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else
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defenderHex = CStack::meleeAttackHexes(attacker, defender, hex);
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for(BattleHex defHex : defenderHex)
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{
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if(defHex == hex) // should be impossible but check anyway
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continue;
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AttackPossibility ap(hex, defHex, attackInfo);
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ap.attackerState = attacker->acquireState();
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ap.shootersBlockedDmg = bestAp.shootersBlockedDmg;
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const int totalAttacks = ap.attackerState->getTotalAttacks(attackInfo.shooting);
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if (!attackInfo.shooting)
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ap.attackerState->setPosition(hex);
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std::vector<const battle::Unit*> units;
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if (attackInfo.shooting)
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units = state.getAttackedBattleUnits(attacker, defHex, true, BattleHex::INVALID);
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else
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units = state.getAttackedBattleUnits(attacker, defHex, false, hex);
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// ensure the defender is also affected
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bool addDefender = true;
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for(auto unit : units)
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{
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if (unit->unitId() == defender->unitId())
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{
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addDefender = false;
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break;
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}
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}
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if(addDefender)
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units.push_back(defender);
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for(auto u : units)
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{
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if(!ap.attackerState->alive())
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break;
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auto defenderState = u->acquireState();
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ap.affectedUnits.push_back(defenderState);
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for(int i = 0; i < totalAttacks; i++)
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{
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int64_t damageDealt, damageReceived, defenderDamageReduce, attackerDamageReduce;
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DamageEstimation retaliation;
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auto attackDmg = state.battleEstimateDamage(ap.attack, &retaliation);
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vstd::amin(attackDmg.damage.min, defenderState->getAvailableHealth());
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vstd::amin(attackDmg.damage.max, defenderState->getAvailableHealth());
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vstd::amin(retaliation.damage.min, ap.attackerState->getAvailableHealth());
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vstd::amin(retaliation.damage.max, ap.attackerState->getAvailableHealth());
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damageDealt = averageDmg(attackDmg.damage);
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defenderDamageReduce = calculateDamageReduce(attacker, defender, damageDealt, state);
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ap.attackerState->afterAttack(attackInfo.shooting, false);
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//FIXME: use ranged retaliation
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damageReceived = 0;
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attackerDamageReduce = 0;
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if (!attackInfo.shooting && defenderState->ableToRetaliate() && !counterAttacksBlocked)
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{
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damageReceived = averageDmg(retaliation.damage);
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attackerDamageReduce = calculateDamageReduce(defender, attacker, damageReceived, state);
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defenderState->afterAttack(attackInfo.shooting, true);
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}
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bool isEnemy = state.battleMatchOwner(attacker, u);
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// this includes enemy units as well as attacker units under enemy's mind control
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if(isEnemy)
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ap.defenderDamageReduce += defenderDamageReduce;
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// damaging attacker's units (even those under enemy's mind control) is considered friendly fire
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if(attackerSide == u->unitSide())
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ap.collateralDamageReduce += defenderDamageReduce;
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if(u->unitId() == defender->unitId() ||
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(!attackInfo.shooting && CStack::isMeleeAttackPossible(u, attacker, hex)))
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{
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//FIXME: handle RANGED_RETALIATION ?
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ap.attackerDamageReduce += attackerDamageReduce;
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}
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ap.attackerState->damage(damageReceived);
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defenderState->damage(damageDealt);
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if (!ap.attackerState->alive() || !defenderState->alive())
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break;
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}
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}
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if(!bestAp.dest.isValid() || ap.attackValue() > bestAp.attackValue())
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bestAp = ap;
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}
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// check how much damage we gain from blocking enemy shooters on this hex
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bestAp.shootersBlockedDmg = evaluateBlockedShootersDmg(attackInfo, hex, state);
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#if BATTLE_TRACE_LEVEL>=1
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logAi->trace("BattleAI best AP: %s -> %s at %d from %d, affects %d units: d:%lld a:%lld c:%lld s:%lld",
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attackInfo.attacker->unitType()->getJsonKey(),
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attackInfo.defender->unitType()->getJsonKey(),
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(int)bestAp.dest, (int)bestAp.from, (int)bestAp.affectedUnits.size(),
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bestAp.defenderDamageReduce, bestAp.attackerDamageReduce, bestAp.collateralDamageReduce, bestAp.shootersBlockedDmg);
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#endif
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//TODO other damage related to attack (eg. fire shield and other abilities)
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return bestAp;
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}
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