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* Limb Exposure System for Counter-Attack Detection
*
* **Korean**: 사지 노출 시스템 (Saji Nochul System)
*
* Analyzes technique animations to determine when limbs become exposed and vulnerable
* during attack execution. This enables:
* - Defensive counter-attacks (반격 - banggyeok)
* - Breaking techniques (파쇄기 - paswaegi)
* - Exploiting overextension (과다신장 약점 - gwada sinjang yakjeom)
*
* **Martial Arts Philosophy**:
* - **허점공격** (Heojeom Gonggyeok) - Attacking openings/weaknesses
* - **후수필승** (Husu Pilseung) - Victory through counter-attack timing
* - **이순응변** (Isun Eungbyeon) - Adapt and exploit opponent's mistakes
*
* @module systems/combat/LimbExposureSystem
* @korean 사지노출시스템
*/
import type { KoreanTechnique } from "../vitalpoint/types";
import type {
BreakingResult,
BreakingTarget,
CounterOpportunity,
ExposedLimbType,
LimbExposureWindow,
PhysicalReachConfig,
} from "../../types/physics";
import { BREAKING_STATUS_EFFECT_IDS } from "./BreakingStatusEffects";
/**
* Breaking technique constants
* **Korean**: 파쇄기술 상수
*/
/**
* Minimum effective force required to successfully execute a breaking technique.
* Force below this threshold will not break joints/bones.
* Typical damage values range from 20-80, with 40 being the minimum for effective breaks.
* @korean 파쇄최소힘
*/
const BREAKING_FORCE_THRESHOLD = 40;
/**
* Maximum effective force for calculating break severity on 0-1 scale.
* Force values above 80 are clamped to 1.0 severity (complete break).
* @korean 파쇄최대힘
*/
const BREAKING_MAX_FORCE = 80;
/**
* Maximum range in meters for executing counter-attacks.
* Counter-attacks are close-range defensive techniques requiring proximity.
* @korean 반격최대거리
*/
const MAX_COUNTER_RANGE_METERS = 1.0;
/**
* Calculate counter-attack opportunities from a technique's reach configuration.
*
* **Korean**: 반격 기회 계산
*
* Analyzes the technique's execution timeline and limb exposure to identify
* windows where the opponent is vulnerable to counter-attacks.
*
* @param technique - The technique being executed
* @param currentTime - Current time in technique execution (ms)
* @returns Counter opportunity if one exists, undefined otherwise
*
* @public
* @korean 반격기회계산
*/
export function calculateCounterOpportunity(
technique: KoreanTechnique,
currentTime: number
): CounterOpportunity | undefined {
const { reachConfig, executionTime } = technique;
// No exposure window defined, no counter opportunity
if (!reachConfig.exposureWindow) {
return undefined;
}
const exposure = reachConfig.exposureWindow;
// Calculate absolute timing of exposure window
const windowStart = executionTime * exposure.startTime;
const windowEnd = windowStart + exposure.duration;
// Check if current time is within the exposure window
if (currentTime < windowStart || currentTime > windowEnd) {
return undefined;
}
// Determine recommended counter techniques based on exposed limb
const recommendedCounters = getRecommendedCounters(
exposure.exposedLimb,
reachConfig,
exposure.allowsBreaking
);
return {
exposedLimb: exposure.exposedLimb,
windowStart,
windowDuration: exposure.duration,
vulnerabilityMultiplier: exposure.vulnerabilityMultiplier,
allowsBreaking: exposure.allowsBreaking,
recommendedCounters,
};
}
/**
* Get recommended counter-technique IDs for an exposed limb.
*
* **Korean**: 추천 반격 기술 조회
*
* Returns technique IDs that would be effective against the exposed limb.
* These IDs are string-based and should match techniques in the game's
* technique library. When implementing, validate these IDs exist.
*
* **Note**: These are example/placeholder IDs. Actual implementation should
* reference real technique definitions or use a typed enum of technique IDs.
*
* @param exposedLimb - The limb that is exposed
* @param reachConfig - Reach configuration of the attacking technique
* @param allowsBreaking - Whether breaking techniques are viable
* @returns Array of recommended counter-technique IDs (unvalidated strings)
*
* @internal
* @korean 추천반격기술조회
*/
function getRecommendedCounters(
exposedLimb: ExposedLimbType,
reachConfig: PhysicalReachConfig,
allowsBreaking: boolean
): readonly string[] {
const counters: string[] = [];
// Breaking techniques for overextended limbs
if (allowsBreaking) {
if (exposedLimb.includes("leg") || exposedLimb.includes("ankle")) {
counters.push("leg_sweep", "ankle_break", "knee_stomp");
} else if (exposedLimb.includes("knee")) {
counters.push("knee_break", "hyperextension_kick");
} else if (exposedLimb.includes("arm") || exposedLimb.includes("elbow")) {
counters.push("arm_bar", "elbow_break", "joint_lock");
E} else if (exposedLimb.includes("wrist")) {
counters.push("wrist_lock", "wrist_break");
}
}
// Vital point strikes on exposed limbs
if (exposedLimb.includes("arm")) {
counters.push("ulnar_nerve_strike", "radial_nerve_pressure");
} else if (exposedLimb.includes("leg")) {
counters.push("peroneal_nerve_strike", "thigh_pressure_point");
}
// Counter-strikes based on body part type
if (reachConfig.bodyPart === "leg") {
counters.push("leg_parry_counter", "inside_leg_kick");
E} else if (reachConfig.bodyPart === "arm") {
counters.push("arm_trap_counter", "redirect_punch");
}
return counters;
}
/**
* Calculate vulnerability multiplier for a technique at a specific time.
*
* **Korean**: 취약성 배수 계산
*
* Determines how vulnerable the attacker is at a given point in their
* technique execution. Useful for damage calculation during counter-attacks.
*
* @param technique - The technique being executed
* @param currentTime - Current time in technique execution (ms)
* @returns Vulnerability multiplier (1.0 = normal, >1.0 = more vulnerable)
*
* @public
* @korean 취약성배수계산
*/
export function calculateVulnerabilityMultiplier(
technique: KoreanTechnique,
currentTime: number
): number {
const { reachConfig, executionTime, recoveryTime } = technique;
// No exposure window, return baseline vulnerability
if (!reachConfig.exposureWindow) {
return 1.0;
}
const exposure = reachConfig.exposureWindow;
const windowStart = executionTime * exposure.startTime;
const windowEnd = windowStart + exposure.duration;
// Before exposure window: slight vulnerability during wind-up
if (currentTime < windowStart) {
return 1.1;
}
// Within exposure window: maximum vulnerability
if (currentTime <= windowEnd) {
return exposure.vulnerabilityMultiplier;
}
// Recovery phase: moderate vulnerability
const recoveryStart = executionTime;
const recoveryEnd = executionTime + recoveryTime;
if (currentTime > recoveryStart && currentTime <= recoveryEnd) {
const recoveryProgress = (currentTime - recoveryStart) / recoveryTime;
// Linearly decrease from max vulnerability to baseline
return (
exposure.vulnerabilityMultiplier -
(exposure.vulnerabilityMultiplier - 1.0) * recoveryProgress
);
}
// After recovery: baseline vulnerability
return 1.0;
}
/**
* Determine which limb is exposed based on technique and animation state.
*
* **Korean**: 노출된 사지 결정
*
* Analyzes the technique's body part and animation to determine which
* specific limb (left/right) is currently exposed.
*
* @param technique - The technique being executed
* @param isLeftSided - Whether the technique uses the left side
* @returns The exposed limb type
*
* @public
* @korean 노출사지결정
*/
export function determineExposedLimb(
technique: KoreanTechnique,
isLeftSided: boolean = false
): ExposedLimbType {
const { reachConfig } = technique;
// If exposure window explicitly defines the limb, use it
if (reachConfig.exposureWindow?.exposedLimb) {
return reachConfig.exposureWindow.exposedLimb;
}
// Otherwise, infer from body part and sidedness
const side = isLeftSided ? "left" : "right";
switch (reachConfig.bodyPart) {
case "arm":
// Determine joint based on reach extension
if (reachConfig.baseExtension > 0.8) {
return `${side}_arm` as ExposedLimbType;
} else if (reachConfig.baseExtension > 0.5) {
return `${side}_elbow` as ExposedLimbType;
} else {
return `${side}_wrist` as ExposedLimbType;
}
case "leg":
// Kicks expose different parts based on extension
if (reachConfig.baseExtension > 1.0) {
return `${side}_leg` as ExposedLimbType;
} else if (reachConfig.baseExtension > 0.7) {
return `${side}_knee` as ExposedLimbType;
} else E{
return `${side}_ankle` as ExposedLimbType;
}
case "torso":
// Torso techniques typically expose arms
return `${side}_arm` as ExposedLimbType;
default:
return "right_arm";
}
}
/**
* Map exposed limb to breaking technique target.
*
* **Korean**: 노출 사지를 파쇄 목표로 매핑
*
* Converts an exposed limb type to the appropriate breaking target
* for joint and limb breaking techniques.
*
* @param exposedLimb - The exposed limb
* @returns The breaking target joint/bone
*
* @public
* @korean 파쇄목표매핑
*/
export function mapLimbToBreakingTarget(
exposedLimb: ExposedLimbType
): BreakingTarget {
if (exposedLimb.includes("ankle")) return "ankle";
if (exposedLimb.includes("knee")) return "knee";
if (exposedLimb.includes("elbow")) return "elbow";
if (exposedLimb.includes("wrist")) return "wrist";
// Default mapping for general limbs
if (exposedLimb.includes("leg")) return "knee";
Eif (exposedLimb.includes("arm")) return "elbow";
return "elbow"; // Default fallback
}
/**
* Calculate breaking technique effectiveness.
*
* **Korean**: 파쇄 기술 효과 계산
*
* Determines the result of a breaking technique applied to an exposed limb,
* considering the vulnerability window, force applied, and target joint.
*
* @param breakingTechnique - The breaking technique being applied (reserved for future use)
* @param counterOpportunity - The counter opportunity being exploited
* @param force - Force/damage of the breaking technique (typically 20-80 range)
* @returns Result of the breaking attempt
*
* @remarks
* The breakingTechnique parameter is currently unused but reserved for future
* extensibility. It may be used to apply technique-specific modifiers or
* validate technique compatibility with the breaking target.
*
* @public
* @korean 파쇄기술효과계산
*/
export function calculateBreakingResult(
breakingTechnique: KoreanTechnique,
counterOpportunity: CounterOpportunity,
force: number
): BreakingResult {
// Note: breakingTechnique parameter reserved for future use
// (e.g., technique-specific breaking modifiers)
void breakingTechnique;
const target = mapLimbToBreakingTarget(counterOpportunity.exposedLimb);
// Breaking only works during valid windows
if (!counterOpportunity.allowsBreaking) {
return {
success: false,
target,
severity: 0,
damage: force * 0.5, // Reduced damage without breaking
mobilityReduction: 0,
statusEffects: [],
};
}
// Calculate breaking severity based on force and vulnerability
const effectiveForce = force * counterOpportunity.vulnerabilityMultiplier;
const baseSuccess = effectiveForce > BREAKING_FORCE_THRESHOLD;
const severity = Math.min(effectiveForce / BREAKING_MAX_FORCE, 1.0);
if (!baseSuccess) {
return {
success: false,
target,
severity: 0,
damage: effectiveForce * 0.7,
mobilityReduction: 0,
statusEffects: [],
};
}
// Successful break - apply appropriate effects
// Status effect IDs from BREAKING_STATUS_EFFECT_IDS constants
// See src/systems/combat/BreakingStatusEffects.ts for all available IDs
const statusEffects: string[] = [BREAKING_STATUS_EFFECT_IDS.PAIN];
let mobilityReduction: number;
// Severity-based effects
if (severity > 0.8) {
// Severe break - dislocation or fracture
statusEffects.push(
BREAKING_STATUS_EFFECT_IDS.SEVERE_INJURY,
BREAKING_STATUS_EFFECT_IDS.DISABLED_LIMB
);
mobilityReduction = 0.6;
Eif (target === "ankle" || target === "knee") {
statusEffects.push(BREAKING_STATUS_EFFECT_IDS.IMPAIRED_MOBILITY);
mobilityReduction = 0.8; // Leg breaks severely impact movement
}
} else if (severity > 0.5) {
// Moderate break
statusEffects.push(BREAKING_STATUS_EFFECT_IDS.INJURED_LIMB);
mobilityReduction = 0.4;
} else E{
// Minor break - sprain or strain
statusEffects.push(BREAKING_STATUS_EFFECT_IDS.SPRAINED_JOINT);
mobilityReduction = 0.2;
}
// Bleeding for bone breaks
Eif (severity > 0.6) {
statusEffects.push(BREAKING_STATUS_EFFECT_IDS.BLEEDING);
}
return {
success: true,
target,
severity,
damage: effectiveForce,
mobilityReduction,
statusEffects,
};
}
/**
* Check if a defender can execute a counter-attack.
*
* **Korean**: 반격 실행 가능 여부 확인
*
* Validates whether a defender is in position and has the resources
* to execute a counter-attack against an exposed limb.
*
* @param defenderStamina - Defender's current stamina
* @param counterTechnique - The counter technique to execute
* @param distance - Distance between attacker and defender (meters)
* @returns Whether the counter can be executed
*
* @public
* @korean 반격실행가능확인
*/
export function canExecuteCounter(
defenderStamina: number,
counterTechnique: KoreanTechnique,
distance: number
): boolean {
// Check stamina requirement
if (defenderStamina < counterTechnique.staminaCost) {
return false;
}
// Counter must be executable at current distance
if (distance > MAX_COUNTER_RANGE_METERS) {
return false;
}
return true;
}
/**
* Generate limb exposure window for a technique.
*
* **Korean**: 사지 노출 시간 생성
*
* Creates a default limb exposure window for techniques that don't
* explicitly define one, based on heuristics from the technique type
* and reach configuration.
*
* @param technique - The technique to generate exposure for
* @returns Generated limb exposure window
*
* @public
* @korean 사지노출시간생성
*/
export function generateLimbExposureWindow(
technique: KoreanTechnique
): LimbExposureWindow {
const { reachConfig, executionTime } = technique;
const exposedLimb = determineExposedLimb(technique);
// High extension = high vulnerability
const isHighExtension = reachConfig.baseExtension > 1.0;
const isMediumExtension = reachConfig.baseExtension > 0.8;
// Determine vulnerability based on extension
let vulnerabilityMultiplier: number;
let allowsBreaking: boolean;
if (isHighExtension) {
vulnerabilityMultiplier = 2.2; // Very vulnerable
allowsBreaking = true;
} else if (isMediumExtension) {
vulnerabilityMultiplier = 1.6;
allowsBreaking = false;
} else {
vulnerabilityMultiplier = 1.2; // Low extension, low vulnerability
allowsBreaking = false;
}
// Exposure starts during peak extension (typically 40-60% of execution)
const startTime = 0.5;
// Duration scales with execution time (20-40% of execution)
const durationRatio = isHighExtension ? 0.4 : 0.25;
const duration = Math.floor(executionTime * durationRatio);
return {
exposedLimb,
startTime,
duration,
vulnerabilityMultiplier,
allowsBreaking,
};
}
export default {
calculateCounterOpportunity,
calculateVulnerabilityMultiplier,
determineExposedLimb,
mapLimbToBreakingTarget,
calculateBreakingResult,
canExecuteCounter,
generateLimbExposureWindow,
};
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