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<?php |
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declare(strict_types=1); |
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namespace AardsGerds\Game\Fight; |
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use AardsGerds\Game\Build\Talent\Effect\BlockImmunity; |
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use AardsGerds\Game\Shared\IntegerValue; |
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final class Block |
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{ |
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private const MINIMAL_CHANCE = 0.1; |
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private const MAXIMAL_CHANCE = 0.9; |
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/** |
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* Bonus per level of (advantage in) weapon mastery |
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* For example: 6 level vs 0 level = 6 x 0.05 + 6 x 0.5 = 0.6 |
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*/ |
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private const BONUS_FOR_WEAPON_MASTERY = 0.05; |
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/** |
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* Bonus per point of advantage in strength, limited to 100 points |
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* For example: 150 points vs 50 points = 100 x 0.005 = 0.5 |
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*/ |
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private const BONUS_FOR_STRENGTH = 0.005; |
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/** |
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* @example |
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* attacker: 2 wm, 50 str |
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* target: 4 wm, 80 str |
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* bonus for wm: 4 x 0.05 = 0.2 |
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* bonus for advantage: 2 x 0.05 + 30 x 0.005 = 0.1 + 0.15 = 0.25 |
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* expected chance: minimal + bonuses = 0.1 + 0.2 + 0.25 = 0.55 |
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* |
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* @example |
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* attacker: 4 wm, 80 str |
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* target: 2 wm, 50 str |
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* bonus for wm: 2 x 0.05 = 0.1 |
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* bonus for advantage: 0 |
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* expected chance: minimal + bonuses = 0.1 + 0.1 = 0.2 |
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*/ |
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public static function calculateChance( |
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Fighter $attacker, |
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Fighter $target, |
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Attack $attack, |
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): IntegerValue { |
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if (self::cannotHappen($attack)) { |
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return new IntegerValue(0); |
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} |
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$chance = self::MINIMAL_CHANCE; |
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$bonusForWeaponMastery = $target->getWeaponMasteryLevel()->get() * self::BONUS_FOR_WEAPON_MASTERY; |
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$chance += $bonusForWeaponMastery; |
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if ($target->getWeaponMasteryLevel()->isGreaterThan($attacker->getWeaponMasteryLevel())) { |
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$advantageInWeaponMastery = $target->getWeaponMasteryLevel()->diff($attacker->getWeaponMasteryLevel()); |
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$chance += $advantageInWeaponMastery->get() * self::BONUS_FOR_WEAPON_MASTERY; |
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} |
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if ($target->getStrength()->isGreaterThan($attacker->getStrength())) { |
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$advantageInStrength = $target->getStrength()->diff($attacker->getStrength()); |
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$chance += $advantageInStrength->get() * self::BONUS_FOR_STRENGTH; |
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} |
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if ($chance > self::MAXIMAL_CHANCE) { |
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$chance = self::MAXIMAL_CHANCE; |
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} |
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return new IntegerValue((int) ($chance * 1000)); |
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} |
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private static function cannotHappen(Attack $attack): bool |
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{ |
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return $attack->getEffects()->has(BlockImmunity::getName()) || $attack instanceof EtherumAttack; |
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} |
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} |
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Assasz /
aards-gerds
