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* useAICombat Hook - AI Combat System Integration
*
* Custom hook for AI combat behavior with strategic decision-making.
*
* Manages AI opponent behavior including:
* - Strategic decision-making via DecisionTree
* - Combo attack sequences
* - Adaptive difficulty based on player skill
* - Performance monitoring (<10ms target for decisions)
*
* Side effects:
* - Manages internal state for AI actions and aggression
* - Sets up intervals/timers for AI action scheduling
* - Updates state in response to combat events and round status
*
* @param config Configuration object for AI combat behavior.
* @param config.player The AI-controlled player state.
* @param config.opponent The opponent player state.
* @param config.personality The AI's personality archetype.
* @param config.adaptiveDifficulty Adaptive difficulty system instance.
* @param config.arenaBounds Arena boundaries for movement validation.
* @param config.roundStarted Whether the combat round has started.
* @param config.roundEnded Whether the combat round has ended.
* @param config.isPaused Whether the game is paused.
* @param config.onExecuteAction Callback to execute AI actions.
* @param config.onStanceChange Callback to handle stance changes.
*
* @returns AI combat state and control functions
*
* @example
* ```typescript
* const { aiState } = useAICombat({
* player: aiPlayer,
* opponent: humanPlayer,
* personality: AI_PERSONALITIES.AGGRESSIVE_STRIKER,
* adaptiveDifficulty,
* arenaBounds,
* roundStarted,
* roundEnded,
* isPaused,
* onExecuteAction: handleAction,
* onStanceChange: handleStanceChange,
* });
* ```
*/
import { getArchetypePhysicalAttributes } from "@/data/archetypePhysicalAttributes";
import {
AdaptiveDifficulty,
AIActionType,
AIComboSystem,
AIDecisionTree,
AIPersonality,
CombatContext,
DifficultyParameters,
getArchetypeBehavior,
getNextComboTechnique,
getSignatureMove,
interpolateDifficultyParameters,
shouldExecuteSignatureMove,
} from "@/systems/ai";
import { physicalReachCalculator } from "@/systems/physics";
import { PlayerState } from "@/systems/player";
import { KoreanTechniquesSystem } from "@/systems/trigram/KoreanTechniques";
import { KOREAN_VITAL_POINTS } from "@/systems/vitalpoint/KoreanVitalPoints";
import { KoreanTechnique } from "@/systems/vitalpoint/types";
import {
CombatAttackType,
DamageType,
PlayerArchetype,
Position,
TrigramStance,
} from "@/types";
import { STANCE_REACH_MODIFIERS } from "@/types/physics";
import { getBalanceState } from "@/utils/player3DHelpers";
import { useCallback, useEffect, useMemo, useRef, useState } from "react";
const AI_DECISION_THRESHOLD_MS = 10; // Threshold for slow decision warnings
const WARNING_THROTTLE_MS = 5000; // Throttle performance warnings to every 5 seconds
/**
* Technique range system (physics-first: meters)
* All distances and ranges are in meters - no pixel conversions for game logic
*
* Each technique has a reachConfig with baseExtension multiplier
* Applied to archetype's limb length: reach = (limbLength/100) × baseExtension × stanceModifier
*
* @korean 기술 범위 시스템 (물리 우선: 미터)
*/
/**
* Get viable techniques based on distance, stance, and stamina
*
* Filters techniques that:
* - Match current stance
* - Are within effective range of opponent
* - Have sufficient stamina to execute
* - Applies selection bias against recently used techniques (avoid >70% repetition)
*
* @korean 거리, 자세, 체력에 따른 실행 가능한 기술 선택
*
* @param distance - Distance to opponent in meters (physics-first)
* @param stance - Current trigram stance
* @param stamina - Available stamina
* @param archetype - Player archetype for specialized techniques
* @param recentTechniques - Array of recently used technique IDs (for variation)
* @returns Array of viable techniques sorted by effectiveness with variation bias
*/
function getViableTechniques(
distance: number,
stance: TrigramStance,
stamina: number,
archetype: PlayerState["archetype"],
recentTechniques: string[] = [],
): readonly KoreanTechnique[] {
const stanceTechniques = KoreanTechniquesSystem.getAllAvailableTechniques(
stance,
archetype,
);
Iif (stanceTechniques.length === 0) {
return [];
}
const viableTechniques = stanceTechniques.filter((tech) => {
const physicalAttributes = getArchetypePhysicalAttributes(archetype);
const animType = tech.animationType;
let maxReach: number;
if (animType) {
maxReach = physicalReachCalculator.calculateMaxReach(
physicalAttributes,
animType,
stance,
);
} else E{
const limbLength =
tech.reachConfig.bodyPart === "leg"
? physicalAttributes.legLength
: physicalAttributes.armLength;
let bodyPivot: number;
if (tech.reachConfig.bodyPart === "leg") {
bodyPivot = 0.25; // meters for kicks
} else {
const shoulderOffset = physicalAttributes.shoulderWidth / 2 / 100;
const torsoRotation = 0.1;
bodyPivot = shoulderOffset + torsoRotation;
}
const stanceModifier = STANCE_REACH_MODIFIERS[stance];
maxReach =
(limbLength / 100 + bodyPivot) *
tech.reachConfig.baseExtension *
stanceModifier;
}
const inRange = distance <= maxReach;
const hasStamina = stamina >= tech.staminaCost;
return inRange && hasStamina;
});
const recentUseCounts = new Map<string, number>();
for (const tech of viableTechniques) {
recentUseCounts.set(
tech.id,
recentTechniques.filter((id) => id === tech.id).length,
);
}
return viableTechniques.sort((a, b) => {
const baseEffectivenessA = (a.damage ?? 0) * (a.accuracy ?? 0.8);
const baseEffectivenessB = (b.damage ?? 0) * (b.accuracy ?? 0.8);
const recentUsesA = recentUseCounts.get(a.id) ?? 0;
const recentUsesB = recentUseCounts.get(b.id) ?? 0;
const penaltyA = Math.min(0.6, recentUsesA * 0.2);
const penaltyB = Math.min(0.6, recentUsesB * 0.2);
const finalEffectivenessA = baseEffectivenessA * (1 - penaltyA);
const finalEffectivenessB = baseEffectivenessB * (1 - penaltyB);
return finalEffectivenessB - finalEffectivenessA;
});
}
/**
* Select optimal vital point for attack based on stance compatibility and archetype priority
*
* Prioritizes vital points by:
* 1. Archetype vital target priority (health/pain/consciousness/balanced)
* 2. Stance compatibility (must be in effectiveStances array)
* 3. Base damage threshold (>25 damage preferred)
* 4. Targeting difficulty vs AI skill level
*
* @korean 자세 효과 및 원형 우선순위에 따른 최적 급소 선택
*
* @param stance - Current trigram stance
* @param difficultyLevel - AI difficulty level (0.0-1.0)
* @param archetype - Player archetype for priority targeting
* @returns Vital point ID or null if no suitable target
*/
function selectOptimalVitalPoint(
stance: TrigramStance,
difficultyLevel: number,
archetype: PlayerState["archetype"],
): string | null {
Iif (KOREAN_VITAL_POINTS.length === 0) {
return null;
}
const behavior = getArchetypeBehavior(archetype);
const effectivePoints = KOREAN_VITAL_POINTS.filter((point) =>
point.effectiveStances?.includes(stance),
);
Iif (effectivePoints.length === 0) {
const fallbackPoint =
KOREAN_VITAL_POINTS[
Math.floor(Math.random() * KOREAN_VITAL_POINTS.length)
];
return fallbackPoint?.id ?? null;
}
const HIGH_DAMAGE_THRESHOLD = 25;
const highDamagePoints = effectivePoints.filter(
(point) => (point.baseDamage ?? 0) > HIGH_DAMAGE_THRESHOLD,
);
const targetPoints =
highDamagePoints.length > 0 ? highDamagePoints : effectivePoints;
const sortedPoints = [...targetPoints].sort((a, b) => {
const baseSuitabilityA =
(a.baseDamage ?? 0) *
(1 - Math.abs(difficultyLevel - a.targetingDifficulty));
const baseSuitabilityB =
(b.baseDamage ?? 0) *
(1 - Math.abs(difficultyLevel - b.targetingDifficulty));
const priorityMultiplierA = getVitalPointPriorityScore(
a,
behavior.vitalTargetPriority,
);
const priorityMultiplierB = getVitalPointPriorityScore(
b,
behavior.vitalTargetPriority,
);
const finalSuitabilityA = baseSuitabilityA * priorityMultiplierA;
const finalSuitabilityB = baseSuitabilityB * priorityMultiplierB;
return finalSuitabilityB - finalSuitabilityA;
});
return sortedPoints[0]?.id ?? null;
}
/**
* Calculate priority score for vital point based on archetype targeting preference
*
* @korean 원형 타격 우선순위 점수 계산
*
* @param vitalPoint - Vital point to score
* @param priority - Archetype vital target priority
* @returns Priority multiplier (1.0 = neutral, >1.0 = preferred, <1.0 = deprioritized)
*/
function getVitalPointPriorityScore(
vitalPoint: (typeof KOREAN_VITAL_POINTS)[0],
priority: import("@/systems/ai/AIPersonality").VitalTargetPriority,
): number {
const effects = vitalPoint.effects ?? [];
switch (priority) {
case "health":
return (vitalPoint.baseDamage ?? 0) > 30 ? 1.5 : 1.0;
case "pain":
const hasPainEffect = effects.some(
(e) =>
String(e).toLowerCase().includes("pain") ||
String(e).toLowerCase().includes("disorientation"),
);
return hasPainEffect ? 1.5 : 1.0;
case "consciousness":
const hasConsciousnessEffect = effects.some(
(e) =>
String(e).toLowerCase().includes("unconscious") ||
String(e).toLowerCase().includes("stun") ||
String(e).toLowerCase().includes("breathless"),
);
return hasConsciousnessEffect ? 1.5 : 1.0;
case "balanced":
default:
return 1.0;
}
}
/**
* Check if a technique is a signature move for the given archetype
*
* Signature techniques are identified by:
* - Damage type and attack type matching archetype preferences
* - Ki/Stamina costs indicating advanced techniques
* - Specific technique characteristics (e.g., nerve strikes for Amsalja)
*
* @korean 원형 대표 기술 확인
*
* @param technique - Technique to check
* @param archetype - Player archetype
* @returns True if technique is signature for the archetype
*/
function isSignatureTechnique(
technique: KoreanTechnique,
archetype: PlayerState["archetype"],
): boolean {
const damageType = technique.damageType;
const attackType = technique.type;
const isAdvanced =
(technique.kiCost ?? 0) >= 10 || (technique.staminaCost ?? 0) >= 15;
switch (archetype) {
case PlayerArchetype.MUSA:
return (
damageType === DamageType.JOINT ||
damageType === DamageType.CRUSHING ||
(damageType === DamageType.BLUNT && isAdvanced)
);
case PlayerArchetype.AMSALJA:
return (
damageType === DamageType.NERVE ||
damageType === DamageType.PRESSURE ||
attackType === CombatAttackType.NERVE_STRIKE ||
attackType === CombatAttackType.PRESSURE_POINT
);
case PlayerArchetype.HACKER:
return (
damageType === DamageType.INTERNAL ||
damageType === DamageType.NERVE ||
(isAdvanced && (technique.accuracy ?? 0) >= 0.8) // High accuracy represents calculation
);
case PlayerArchetype.JEONGBO_YOWON:
return (
damageType === DamageType.PRESSURE ||
damageType === DamageType.JOINT ||
attackType === CombatAttackType.GRAPPLE
);
case PlayerArchetype.JOJIK_POKRYEOKBAE:
return (
(technique.damage ?? 0) >= 30 || // High raw damage
damageType === DamageType.SLASHING || // Brutal cutting
damageType === DamageType.PIERCING // Dirty stabbing techniques
);
default:
return false;
}
}
/**
* Update technique usage frequency and rotation queue
*
* Tracks technique usage for diversity enforcement:
* 1. Updates usage frequency counter
* 2. Adds to recent techniques queue (last 5)
* 3. Marks as used in current match
* 4. Resets "all used" when all 4 archetype techniques completed
*
* @korean 기술 사용 빈도 및 순환 큐 업데이트
*
* @param techniqueId - ID of technique just used
* @param rotationQueue - Technique rotation tracking object
* @param archetypeTechniqueIds - All technique IDs for this archetype (for reset detection)
*/
function updateTechniqueRotation(
techniqueId: string,
rotationQueue: TechniqueRotationQueue,
archetypeTechniqueIds: Set<string>,
): void {
const current = rotationQueue.frequency.get(techniqueId) ?? 0;
rotationQueue.frequency.set(techniqueId, current + 1);
rotationQueue.totalAttacks++;
rotationQueue.used.push(techniqueId);
Iif (rotationQueue.used.length > 5) {
rotationQueue.used.shift(); // Keep only last 5
}
rotationQueue.allUsed.add(techniqueId);
let allTechniquesUsed = true;
for (const techId of archetypeTechniqueIds) {
Eif (!rotationQueue.allUsed.has(techId)) {
allTechniquesUsed = false;
break;
}
}
Iif (allTechniquesUsed) {
rotationQueue.allUsed.clear();
}
}
/**
* Check if technique is overused (exceeds 40% threshold)
*
* Enforces variety by identifying techniques that have been
* used more than 40% of total attacks.
*
* @korean 기술 과다 사용 확인 (40% 임계값)
*
* @param techniqueId - Technique ID to check
* @param rotationQueue - Technique rotation tracking object
* @returns True if technique exceeds 40% usage threshold
*/
function isOverused(
techniqueId: string,
rotationQueue: TechniqueRotationQueue,
): boolean {
if (rotationQueue.totalAttacks === 0) {
return false;
}
const uses = rotationQueue.frequency.get(techniqueId) ?? 0;
const percentage = uses / rotationQueue.totalAttacks;
return percentage > 0.4; // >40% threshold
}
/**
* Select technique with rotation bias for diversity
*
* Prioritizes techniques in this order:
* 1. Never used in this match (highest priority)
* 2. Not used in last 5 techniques (avoid repetition)
* 3. Any viable technique (fallback)
*
* Within each priority tier, selects by effectiveness (damage × accuracy).
*
* @korean 다양성을 위한 순환 편향 기술 선택
*
* @param viableTechniques - Techniques that are viable (range, stamina, stance)
* @param rotationQueue - Technique rotation tracking object
* @returns Best technique with rotation bias applied
*/
function selectTechniqueWithRotation(
viableTechniques: readonly KoreanTechnique[],
rotationQueue: TechniqueRotationQueue,
): KoreanTechnique | undefined {
Iif (viableTechniques.length === 0) {
return undefined;
}
const balancedTechniques = viableTechniques.filter(
(t) => !isOverused(t.id, rotationQueue),
);
const candidates =
balancedTechniques.length > 0 ? balancedTechniques : viableTechniques;
Iif (balancedTechniques.length === 0 && rotationQueue.totalAttacks > 0) {
rotationQueue.frequency.clear();
rotationQueue.totalAttacks = 0;
}
const neverUsed = candidates.filter((t) => !rotationQueue.allUsed.has(t.id));
Eif (neverUsed.length > 0) {
return [...neverUsed].sort((a, b) => {
const effA = (a.damage ?? 0) * (a.accuracy ?? 0.8);
const effB = (b.damage ?? 0) * (b.accuracy ?? 0.8);
return effB - effA;
})[0];
}
const unusedRecently = candidates.filter(
(t) => !rotationQueue.used.includes(t.id),
);
if (unusedRecently.length > 0) {
return [...unusedRecently].sort((a, b) => {
const effA = (a.damage ?? 0) * (a.accuracy ?? 0.8);
const effB = (b.damage ?? 0) * (b.accuracy ?? 0.8);
return effB - effA;
})[0];
}
return [...candidates].sort((a, b) => {
const effA = (a.damage ?? 0) * (a.accuracy ?? 0.8);
const effB = (b.damage ?? 0) * (b.accuracy ?? 0.8);
return effB - effA;
})[0];
}
/**
* Filter techniques by cooldown availability
*
* Returns only techniques that are off cooldown and ready to use.
* If all techniques are on cooldown, returns empty array.
*
* @korean 재사용 대기시간별 기술 필터링
*
* @param techniques - Techniques to filter
* @param cooldownMap - Map of technique ID to last use timestamp
* @returns Techniques that are off cooldown
*/
function filterByCooldown(
techniques: readonly KoreanTechnique[],
cooldownMap: TechniqueCooldownMap,
): readonly KoreanTechnique[] {
const now = Date.now();
return techniques.filter((t) => {
const lastUsed = cooldownMap.get(t.id) ?? 0;
const cooldown = (t.recoveryTime ?? 0) + (t.executionTime ?? 0); // Total cooldown time
const timeSinceUse = now - lastUsed;
return timeSinceUse >= cooldown;
});
}
/**
* Get all techniques for an archetype (for cross-stance usage)
*
* Returns all 4 techniques available to the archetype,
* regardless of stance requirements.
*
* @korean 원형의 모든 기술 가져오기 (교차 자세 사용)
*
* @param archetype - Player archetype
* @returns All techniques for the archetype
*/
function getAllArchetypeTechniques(
archetype: PlayerState["archetype"],
): readonly KoreanTechnique[] {
return KoreanTechniquesSystem.getTechniquesByArchetype(archetype);
}
/**
* Apply cross-stance damage modifier to technique
*
* Creates a modified copy of the technique with 80% damage for cross-stance usage.
* This prevents mutation of the original technique object.
*
* **Design Rationale for 80% Effectiveness:**
* Cross-stance techniques are performed from a non-optimal stance, reducing
* power generation and body mechanics efficiency. The 80% modifier reflects:
* - Suboptimal weight transfer and leverage
* - Reduced muscle engagement from non-ideal positioning
* - Decreased stability and balance during execution
*
* This is consistent with Korean martial arts philosophy where proper stance
* (자세) is fundamental to technique effectiveness. Other properties like
* accuracy and execution time remain unchanged as the technique mechanics
* themselves are unchanged, only the power generation is affected.
*
* @korean 교차 자세 피해 배율 적용 (80% 효과)
*
* @param technique - Original technique
* @param isCrossStance - Whether technique is from different stance
* @returns Modified technique with 80% damage if cross-stance, original otherwise
*/
function applyCrossStanceDamageModifier(
technique: KoreanTechnique,
isCrossStance: boolean,
): KoreanTechnique {
Eif (!isCrossStance || !technique.damage) {
return technique;
}
return {
...technique,
damage: Math.floor(technique.damage * 0.8),
};
}
/**
* Helper to select technique for AI action with rotation and cooldown awareness
*
* Enhanced technique selection with:
* - Technique rotation queue for diversity (prevents >70% repetition → targets <40%)
* - Cooldown-aware filtering (prioritizes ready techniques)
* - Cross-stance fallback (uses other techniques at 80% effectiveness)
* - Archetype signature bias (maintains 40%+ signature technique usage)
*
* @korean 순환 및 재사용 대기시간을 고려한 기술 선택
*
* @param isSpecialTechnique - Whether to filter for high-cost special techniques
* @param context - Current combat context
* @param player - AI player state
* @param adaptiveDifficulty - Adaptive difficulty system
* @param rotationQueue - Technique rotation tracking object
* @param cooldownMap - Technique cooldown tracking map
* @returns Selected technique, vital point, action type, and cross-stance flag
*/
function selectTechniqueForAction(
isSpecialTechnique: boolean,
context: CombatContext,
player: PlayerState,
adaptiveDifficulty: AdaptiveDifficulty,
rotationQueue: TechniqueRotationQueue,
cooldownMap: TechniqueCooldownMap,
): {
technique?: KoreanTechnique;
vitalPoint?: string;
actionType: string;
isCrossStance?: boolean;
} {
Iif (shouldExecuteSignatureMove(player.archetype, context)) {
const signatureMoveId = getSignatureMove(player.archetype);
const allTechniques = getAllArchetypeTechniques(player.archetype);
const signatureTechnique = allTechniques.find(
(t) => t.id === signatureMoveId,
);
if (signatureTechnique) {
const now = Date.now();
const lastUsed = cooldownMap.get(signatureMoveId) ?? 0;
const techniqueCooldown =
(signatureTechnique.recoveryTime ?? 0) +
(signatureTechnique.executionTime ?? 0);
const cooldownRemaining = Math.max(
0,
techniqueCooldown - (now - lastUsed),
);
if (
cooldownRemaining === 0 &&
player.stamina >= signatureTechnique.staminaCost &&
player.ki >= signatureTechnique.kiCost
) {
console.log(
`[AI] Executing signature move: ${signatureMoveId} for ${player.archetype}`,
);
const difficultyLevel = adaptiveDifficulty.calculatePlayerSkill();
const vitalPoint =
selectOptimalVitalPoint(
player.currentStance,
difficultyLevel,
player.archetype,
) ?? undefined;
return {
technique: signatureTechnique,
vitalPoint,
actionType: "signature_move",
isCrossStance: signatureTechnique.stance !== player.currentStance,
};
}
}
}
const viableTechniques = getViableTechniques(
context.distanceToOpponent,
player.currentStance,
player.stamina,
player.archetype,
rotationQueue.used, // Pass recent techniques for penalty
);
const readyTechniques = filterByCooldown(viableTechniques, cooldownMap);
let candidates =
readyTechniques.length > 0 ? readyTechniques : viableTechniques;
if (isSpecialTechnique) {
const specialCandidates = candidates.filter(
(tech) => tech.kiCost >= 10 || tech.staminaCost >= 15,
);
candidates = specialCandidates.length > 0 ? specialCandidates : candidates;
}
let isCrossStance = false;
if (candidates.length === 0) {
const allTechniques = getAllArchetypeTechniques(player.archetype);
const crossStanceTechniques = allTechniques.filter(
(t) =>
t.stance !== player.currentStance &&
context.distanceToOpponent <= (t.reachConfig?.baseExtension ?? 1.0) &&
player.stamina >= t.staminaCost &&
!isOverused(t.id, rotationQueue), // Apply rotation diversity to cross-stance
);
const readyCrossStance = filterByCooldown(
crossStanceTechniques,
cooldownMap,
);
candidates =
readyCrossStance.length > 0 ? readyCrossStance : crossStanceTechniques;
isCrossStance = candidates.length > 0;
}
if (candidates.length > 0) {
const signatureTechniques = candidates.filter((tech) =>
isSignatureTechnique(tech, player.archetype),
);
const useSignature = signatureTechniques.length > 0 && Math.random() < 0.6;
const selectedCandidates = useSignature ? signatureTechniques : candidates;
const technique = selectTechniqueWithRotation(
selectedCandidates,
rotationQueue,
);
Eif (technique) {
const difficultyLevel = adaptiveDifficulty.calculatePlayerSkill();
const vitalPoint =
selectOptimalVitalPoint(
player.currentStance,
difficultyLevel,
player.archetype,
) ?? undefined;
const finalTechnique = applyCrossStanceDamageModifier(
technique,
isCrossStance,
);
return {
technique: finalTechnique,
vitalPoint,
actionType: isSpecialTechnique ? "technique" : "attack",
isCrossStance,
};
}
}
return { actionType: "idle" };
}
/**
* Determine if AI should switch stance laterality based on personality and tactical situation.
*
* Strategic laterality decisions in Korean martial arts:
* - **Aggressive personality**: Prefers matched stances (same laterality) for offensive advantage
* Matched stances expose centerlines, creating attack opportunities
* - **Defensive personality**: Prefers mismatched stances (opposite laterality) for protection
* Mismatched stances naturally guard centerlines with lead hand
* - **Health-based modifier**: Low health increases defensive preference
*
* @param aiLaterality - AI's current stance laterality
* @param opponentLaterality - Opponent's stance laterality
* @param personality - AI personality archetype
* @param aiHealth - AI's current health (0-100)
* @param lastSwitchTime - Timestamp of last laterality switch
* @param currentTime - Current timestamp for cooldown check
* @returns true if AI should switch laterality, false otherwise
*
* @korean AI 측면성 전환 결정
*/
function shouldAISwitchLaterality(
aiLaterality: "left" | "right",
opponentLaterality: "left" | "right",
personality: AIPersonality,
aiHealth: number,
lastSwitchTime: number,
currentTime: number,
): boolean {
const LATERALITY_COOLDOWN = 3000;
if (currentTime - lastSwitchTime < LATERALITY_COOLDOWN) {
return false;
}
const isMatched = aiLaterality === opponentLaterality;
const aggressionFactor = personality.aggressionLevel;
const defenseFactor = personality.defensePreference;
const healthFactor = aiHealth / 100;
const effectiveAggression = aggressionFactor * Math.max(0.3, healthFactor);
const effectiveDefense = defenseFactor * (1.2 - healthFactor * 0.2);
if (effectiveAggression > 0.6 && !isMatched) {
return Math.random() < 0.3; // 30% chance to switch to matched
}
if (effectiveDefense > 0.6 && isMatched) {
return Math.random() < 0.25; // 25% chance to switch to mismatched
}
if (aiHealth < 30 && isMatched) {
return Math.random() < 0.4; // 40% chance when critically low health
}
return false;
}
/**
* AI state management
*/
interface AIState {
nextAction: number;
targetPosition: Position;
lastActionType: string;
consecutiveAttacks: number;
actionCooldown: number;
aggressionLevel: number;
selectedTechnique?: KoreanTechnique;
targetVitalPoint?: string;
recentTechniques: string[]; // Track last 5 techniques for variation
}
/**
* Technique rotation queue for enforcing variety
*
* Tracks technique usage to prevent repetitive patterns:
* - Last 5 techniques used (for immediate variation)
* - All techniques used in current match (for full arsenal tracking)
* - Usage frequency per technique (for 40% threshold enforcement)
* - Total attacks counter (for percentage calculation)
*
* @korean 기술 순환 큐 (다양성 강화)
*/
interface TechniqueRotationQueue {
used: string[]; // Last 5 technique IDs (FIFO)
allUsed: Set<string>; // All techniques used this match
frequency: Map<string, number>; // Usage count per technique ID
totalAttacks: number; // Total attack count for percentage calculation
}
/**
* Technique cooldown tracking
*
* Maps technique ID to timestamp of last use
* Used for cooldown-aware technique selection
*
* @korean 기술 재사용 대기시간 추적
*/
type TechniqueCooldownMap = Map<string, number>;
/**
* AI combat hook configuration
*/
interface UseAICombatConfig {
readonly player: PlayerState;
readonly opponent: PlayerState;
readonly personality: AIPersonality;
readonly adaptiveDifficulty: AdaptiveDifficulty;
readonly isPaused: boolean;
readonly roundStarted: boolean;
readonly roundEnded: boolean;
readonly arenaBounds: {
readonly x: number;
readonly y: number;
readonly width: number;
readonly height: number;
readonly scale?: number;
readonly worldWidthMeters: number; // Arena width in meters for physics calculations
readonly worldDepthMeters: number; // Arena depth in meters for physics calculations
};
readonly onExecuteAction: (
action: string,
targetPosition?: Position,
selectedTechnique?: KoreanTechnique,
targetVitalPoint?: string,
) => void;
readonly onStanceChange?: (stance: TrigramStance) => void;
readonly onLateralityChange?: () => void;
readonly playerLaterality?: "left" | "right";
readonly opponentLaterality?: "left" | "right";
}
/**
* AI combat hook return type
*/
interface UseAICombatReturn {
readonly aiState: AIState;
readonly comboSystem: AIComboSystem;
readonly decisionTree: AIDecisionTree;
readonly adjustedPersonality: AIPersonality;
readonly executeAIAction: (
action: string,
targetPosition?: Position,
selectedTechnique?: KoreanTechnique,
targetVitalPoint?: string,
) => void;
readonly currentDifficultyParams: DifficultyParameters;
readonly updateDifficultyTarget: (newParams: DifficultyParameters) => void;
}
/**
* Custom hook for AI combat behavior
*/
export function useAICombat(config: UseAICombatConfig): UseAICombatReturn {
const {
player,
opponent,
personality,
adaptiveDifficulty,
isPaused,
roundStarted,
roundEnded,
arenaBounds,
onExecuteAction,
onStanceChange,
onLateralityChange,
playerLaterality,
opponentLaterality,
} = config;
const comboSystem = useMemo(() => new AIComboSystem(), []);
const decisionTree = useMemo(() => new AIDecisionTree(), []);
const adjustedPersonality = useMemo(
() => adaptiveDifficulty.adjustAIPersonality(personality),
[adaptiveDifficulty, personality],
);
const lastSkillLevelRef = useRef(0.5);
useEffect(() => {
const newSkillLevel = adaptiveDifficulty.calculatePlayerSkill();
if (Math.abs(newSkillLevel - lastSkillLevelRef.current) > 0.01) {
lastSkillLevelRef.current = newSkillLevel;
decisionTree.setDifficultyLevel(newSkillLevel);
}
}, [adaptiveDifficulty, decisionTree]);
const [currentParams, setCurrentParams] = useState<DifficultyParameters>(() =>
adaptiveDifficulty.getDifficultyParameters(),
);
const [targetParams, setTargetParams] = useState<DifficultyParameters>(() =>
adaptiveDifficulty.getDifficultyParameters(),
);
const startParamsRef = useRef<DifficultyParameters>(currentParams);
const transitionStartTimeRef = useRef<number>(0);
const transitionDurationMs = 10000; // 10 seconds for smooth transition
const [aiState, setAiState] = useState<AIState>(() => {
const now = Date.now();
return {
nextAction: now,
targetPosition: player.position,
lastActionType: "idle",
consecutiveAttacks: 0,
actionCooldown: 500,
aggressionLevel: adjustedPersonality.aggressionLevel,
selectedTechnique: undefined,
targetVitalPoint: undefined,
recentTechniques: [],
};
});
const lastDecisionTimeRef = useRef(0);
const [initialMatchTime] = useState(() => Date.now());
const matchStartTimeRef = useRef(initialMatchTime);
const previousDamageRef = useRef(0);
const [initialActionTime] = useState(() => Date.now());
const nextActionRef = useRef(initialActionTime);
const lastWarningTimeRef = useRef(0);
const lastLateralitySwitchRef = useRef(0); // Track last laterality switch for cooldown
const techniqueRotationQueueRef = useRef<TechniqueRotationQueue>({
used: [],
allUsed: new Set(),
frequency: new Map(),
totalAttacks: 0,
});
const techniqueCooldownMapRef = useRef<TechniqueCooldownMap>(new Map());
const archetypeTechniqueIds = useMemo(() => {
const allTechs = getAllArchetypeTechniques(player.archetype);
return new Set(allTechs.map((t) => t.id));
}, [player.archetype]);
const [initialStanceFatigue] = useState(() => ({
currentStance: player.currentStance,
lastSwitchTime: Date.now(),
}));
const stanceFatigueRef = useRef(initialStanceFatigue);
useEffect(() => {
if (roundStarted) {
matchStartTimeRef.current = Date.now();
previousDamageRef.current = player.totalDamageReceived;
decisionTree.reset();
comboSystem.resetCombo();
stanceFatigueRef.current = {
currentStance: player.currentStance,
lastSwitchTime: Date.now(),
};
techniqueRotationQueueRef.current = {
used: [],
allUsed: new Set(),
frequency: new Map(),
totalAttacks: 0,
};
techniqueCooldownMapRef.current.clear();
}
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [roundStarted, decisionTree, comboSystem]);
useEffect(() => {
if (!roundStarted || roundEnded || isPaused) {
return;
}
Iif (player.currentStance !== stanceFatigueRef.current.currentStance) {
stanceFatigueRef.current = {
currentStance: player.currentStance,
lastSwitchTime: Date.now(),
};
}
}, [player.currentStance, roundStarted, roundEnded, isPaused]);
useEffect(() => {
if (isPaused || !roundStarted || roundEnded) {
return;
}
let animationFrameId: number;
let isComplete = false;
const animate = () => {
Iif (isComplete) return;
const now = Date.now();
const elapsed = now - transitionStartTimeRef.current;
const progress = Math.min(1.0, elapsed / transitionDurationMs);
Iif (progress < 1.0) {
const interpolated = interpolateDifficultyParameters(
startParamsRef.current,
targetParams,
progress,
);
setCurrentParams(interpolated);
animationFrameId = requestAnimationFrame(animate);
} else {
setCurrentParams(targetParams);
isComplete = true;
}
};
animationFrameId = requestAnimationFrame(animate);
return () => {
Eif (animationFrameId) {
cancelAnimationFrame(animationFrameId);
}
};
}, [isPaused, roundStarted, roundEnded, targetParams, transitionDurationMs]);
useEffect(() => {
decisionTree.setDifficultyParameters(currentParams);
}, [decisionTree, currentParams]);
/**
* Execute AI action callback
*
* Passes technique and vital point directly to avoid React state async issues
*
* @korean AI 행동 실행 콜백
*/
const executeAIAction = useCallback(
(
action: string,
targetPosition?: Position,
selectedTechnique?: KoreanTechnique,
targetVitalPoint?: string,
) => {
onExecuteAction(action, targetPosition, selectedTechnique, targetVitalPoint);
},
[onExecuteAction],
);
/**
* Update difficulty target parameters
* Triggers smooth interpolation to new difficulty level
*
* @korean 난이도 목표 매개변수 업데이트
*/
const updateDifficultyTarget = useCallback(
(newParams: DifficultyParameters) => {
startParamsRef.current = currentParams;
transitionStartTimeRef.current = Date.now();
setTargetParams(newParams);
},
[currentParams],
);
/**
* Build combat context for decision-making.
*
* **Physics-first**: Positions are now in METERS, so distance is already in meters.
* No scale conversion needed - direct physics-based calculations.
*
* @korean 전투 컨텍스트 구축
*/
const buildCombatContext = useCallback((): CombatContext => {
const dx = player.position.x - opponent.position.x;
const dy = player.position.y - opponent.position.y;
const distanceInMeters = Math.sqrt(dx * dx + dy * dy);
const recentDamageTaken = Math.max(
0,
player.totalDamageReceived - previousDamageRef.current,
);
previousDamageRef.current = player.totalDamageReceived;
const opponentBalance = getBalanceState(opponent.balance);
return {
playerPosition: player.position,
opponentPosition: opponent.position,
playerHealth: player.health,
playerMaxHealth: player.maxHealth,
playerKi: player.ki,
playerMaxKi: player.maxKi,
playerStamina: player.stamina,
playerMaxStamina: player.maxStamina,
opponentHealth: opponent.health,
opponentStance: opponent.currentStance,
playerStance: player.currentStance,
distanceToOpponent: distanceInMeters, // Physics-first: distance in meters
timeInMatch: Date.now() - matchStartTimeRef.current,
isOpponentAttacking: opponent.combatState === "attacking",
recentDamageTaken,
opponentBalance, // Added for kill mode detection
opponentStamina: opponent.stamina, // Added for vulnerability exploitation (Issue #enhance-intelligence-operative-ai)
opponentMaxStamina: opponent.maxStamina, // Added for vulnerability exploitation
opponentKi: opponent.ki, // Added for vulnerability exploitation (Issue #enhance-intelligence-operative-ai)
opponentMaxKi: opponent.maxKi, // Added for vulnerability exploitation
stanceFatigue: {
timeInStance: Date.now() - stanceFatigueRef.current.lastSwitchTime,
},
arenaBounds,
};
}, [player, opponent, arenaBounds]);
/**
* AI decision loop (fixed memory leak - issue #2529466989)
*/
useEffect(() => {
if (isPaused || !roundStarted || roundEnded) {
return;
}
const aiInterval = setInterval(() => {
const now = Date.now();
if (now < nextActionRef.current) {
return;
}
const decisionStart = performance.now();
const context = buildCombatContext();
const decision = decisionTree.makeDecision(
context,
adjustedPersonality,
comboSystem,
);
const decisionTime = performance.now() - decisionStart;
Iif (decisionTime > AI_DECISION_THRESHOLD_MS) {
const now = Date.now();
if (now - lastWarningTimeRef.current > WARNING_THROTTLE_MS) {
console.warn(
`AI decisions running slow: ${decisionTime.toFixed(2)}ms`,
);
lastWarningTimeRef.current = now;
}
}
lastDecisionTimeRef.current = decisionTime;
let actionType = "idle";
let newTargetPosition = aiState.targetPosition;
let newConsecutiveAttacks = aiState.consecutiveAttacks;
let selectedTechnique: KoreanTechnique | undefined;
let targetVitalPoint: string | undefined;
switch (decision.action) {
case AIActionType.ATTACK:
{
const result = selectTechniqueForAction(
false,
context,
player,
adaptiveDifficulty,
techniqueRotationQueueRef.current,
techniqueCooldownMapRef.current,
);
selectedTechnique = result.technique;
targetVitalPoint = result.vitalPoint;
actionType = result.actionType;
Eif (selectedTechnique) {
updateTechniqueRotation(
selectedTechnique.id,
techniqueRotationQueueRef.current,
archetypeTechniqueIds,
);
techniqueCooldownMapRef.current.set(
selectedTechnique.id,
Date.now(),
);
const nextComboTechnique = getNextComboTechnique(
selectedTechnique.id,
player.archetype,
);
Iif (nextComboTechnique) {
comboSystem.startCombo(player, opponent, adjustedPersonality);
}
}
Eif (actionType === "attack") {
newConsecutiveAttacks++;
}
}
break;
case AIActionType.TECHNIQUE:
{
const result = selectTechniqueForAction(
true,
context,
player,
adaptiveDifficulty,
techniqueRotationQueueRef.current,
techniqueCooldownMapRef.current,
);
selectedTechnique = result.technique;
targetVitalPoint = result.vitalPoint;
actionType = result.actionType;
Iif (selectedTechnique) {
updateTechniqueRotation(
selectedTechnique.id,
techniqueRotationQueueRef.current,
archetypeTechniqueIds,
);
techniqueCooldownMapRef.current.set(
selectedTechnique.id,
Date.now(),
);
const nextComboTechnique = getNextComboTechnique(
selectedTechnique.id,
player.archetype,
);
if (nextComboTechnique) {
comboSystem.startCombo(player, opponent, adjustedPersonality);
}
}
Iif (actionType === "attack" || actionType === "technique") {
newConsecutiveAttacks++;
}
}
break;
case AIActionType.COMBO:
Eif (!comboSystem.isComboActive()) {
comboSystem.startCombo(player, opponent, adjustedPersonality);
}
Iif (
comboSystem.shouldContinueCombo(
player,
opponent,
adjustedPersonality,
)
) {
const technique = comboSystem.getNextComboTechnique();
actionType = technique ? "technique" : "attack";
newConsecutiveAttacks++;
} else {
comboSystem.resetCombo();
actionType = "idle";
}
break;
case AIActionType.DEFEND:
actionType = "defend";
newConsecutiveAttacks = 0;
break;
case AIActionType.COUNTER:
actionType = "counter";
newConsecutiveAttacks = 0;
break;
case AIActionType.RETREAT:
actionType = "retreat";
newTargetPosition = decision.targetPosition ?? aiState.targetPosition;
newConsecutiveAttacks = 0;
break;
case AIActionType.APPROACH:
actionType = "approach";
newTargetPosition = decision.targetPosition ?? opponent.position;
newConsecutiveAttacks = 0;
break;
case AIActionType.CIRCLE:
actionType = "circle";
newTargetPosition = decision.targetPosition ?? aiState.targetPosition;
newConsecutiveAttacks = 0;
break;
case AIActionType.STANCE_CHANGE:
if (decision.targetStance && onStanceChange) {
onStanceChange(decision.targetStance);
}
actionType = "idle";
newConsecutiveAttacks = 0;
break;
case AIActionType.FEINT:
actionType = "feint";
newConsecutiveAttacks = 0;
break;
case AIActionType.WAIT:
default:
actionType = "idle";
newConsecutiveAttacks = 0;
break;
}
Iif (onLateralityChange && playerLaterality && opponentLaterality) {
const shouldSwitch = shouldAISwitchLaterality(
opponentLaterality, // Laterality for player index 1 (AI-controlled in this hook)
playerLaterality, // Laterality for player index 0 (human-controlled in this hook)
adjustedPersonality,
player.health,
lastLateralitySwitchRef.current,
now,
);
if (shouldSwitch) {
onLateralityChange();
lastLateralitySwitchRef.current = now;
}
}
const actionCooldown =
actionType === "attack" || actionType === "technique"
? 200 + Math.random() * 150 // 200-350ms for attacks
: 150 + Math.random() * 150; // 150-300ms for movement/defense
nextActionRef.current = now + actionCooldown;
setAiState((prevState) => {
let updatedRecentTechniques = [...prevState.recentTechniques];
if (selectedTechnique) {
updatedRecentTechniques.push(selectedTechnique.id);
Iif (updatedRecentTechniques.length > 5) {
updatedRecentTechniques = updatedRecentTechniques.slice(-5);
}
}
return {
nextAction: nextActionRef.current,
targetPosition: newTargetPosition,
lastActionType: actionType,
consecutiveAttacks: newConsecutiveAttacks,
actionCooldown,
aggressionLevel: adjustedPersonality.aggressionLevel,
selectedTechnique,
targetVitalPoint,
recentTechniques: updatedRecentTechniques,
};
});
executeAIAction(actionType, newTargetPosition, selectedTechnique, targetVitalPoint);
}, 50); // 50ms loop for responsive AI
return () => clearInterval(aiInterval);
}, [
isPaused,
roundStarted,
roundEnded,
buildCombatContext,
decisionTree,
adjustedPersonality,
comboSystem,
executeAIAction,
onStanceChange,
onLateralityChange,
player,
opponent,
aiState,
playerLaterality,
opponentLaterality,
adaptiveDifficulty,
archetypeTechniqueIds,
]);
return {
aiState,
comboSystem,
decisionTree,
adjustedPersonality,
executeAIAction,
currentDifficultyParams: currentParams,
updateDifficultyTarget,
};
}
|