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* System for managing Korean martial arts vital point (급소) targeting and damage calculation.
*
* **Korean**: 급소 시스템 (Vital Point System)
*
* The VitalPointSystem implements anatomical targeting mechanics based on traditional
* Korean martial arts knowledge of 70 vital points (급소). It handles hit detection,
* damage calculation, and status effect application for precise strikes.
*
* ## Vital Point Philosophy
*
* Korean martial arts identify specific anatomical locations that, when struck precisely,
* can cause disproportionate effects. The system categorizes points by:
*
* - **Location**: Head, neck, torso, limbs, and core
* - **Category**: Neurological, vascular, respiratory, muscular, skeletal, etc.
* - **Severity**: Minor, moderate, major, critical, lethal
* - **Effects**: Unconsciousness, paralysis, pain, stunning, etc.
*
* ## Meridian Integration (경락 통합)
*
* The system integrates Traditional Korean Medicine (TKM) meridian theory:
* - **Time-of-Day Flow**: +30% effectiveness at meridian peak hours
* - **Meridian Disruption**: Status effects from energy flow blockage
* - **Elemental Relationships**: 五行 (Wu Xing) elemental advantages
*
* ## Key Features
*
* - Distance-based hit detection with accuracy falloff
* - Severity multipliers for damage calculation
* - Targeted vs. proximity-based strikes
* - Bilingual Korean-English vital point names
* - Realistic anatomical positioning
* - Meridian state tracking and flow calculation
*
* @example
* ```typescript
* const vitalPointSystem = new VitalPointSystem();
*
* // Process a strike at specific position with time-of-day
* const result = vitalPointSystem.processHit(
* { x: 100, y: 50 }, // Target position
* { width: 10, height: 10 }, // Hit box
* "GB-20", // Optional: target specific vital point
* 14 // Optional: hour of day for meridian flow
* );
*
* if (result.hit && result.vitalPointHit) {
* console.log(`Hit ${result.vitalPointHit.names.english}!`);
* console.log(`Damage: ${result.damage}, Severity: ${result.severity}`);
* console.log(`Meridian bonus: ${result.meridianMultiplier}x`);
* }
* ```
*
* @public
* @category Vital Point System
* @korean 급소시스템
*/
import {
PlayerArchetype,
Position,
TrigramStance,
VitalPointSeverity,
} from "../types/common";
import { convertToStatusEffect } from "./EffectCalculator";
import { StatusEffect } from "./types";
import {
calculateEnhancedVulnerability,
calculateMeridianFlow,
generateMeridianEffects,
} from "./vitalpoint/KoreanAnatomy";
import { getMeridiansForVitalPoint } from "./vitalpoint/MeridianVitalPointMapping";
import { VitalPoint, VitalPointHitResult } from "./vitalpoint/types";
import { VITAL_POINTS_DATA } from "./vitalpoint/VitalPointsData";
/**
* Amount of meridian disruption added per vital point hit (15%)
*/
const DISRUPTION_INCREMENT_PER_HIT = 0.15;
export class VitalPointSystem {
private vitalPoints: VitalPoint[] = [];
private meridianStates: Map<string, number> = new Map(); // Tracks disruption level per meridian
private currentHour: number = 12; // Default to noon
/**
* Creates a new VitalPointSystem instance.
*
* Initializes the system with comprehensive Korean vital points database
* and meridian state tracking.
*
* @param initialHour - Optional initial hour of day (0-23) for meridian flow calculations
*/
constructor(initialHour: number = 12) {
// Initialize with comprehensive Korean vital points database
this.initializeVitalPoints();
this.currentHour = initialHour;
}
/**
* Sets the current hour of day for meridian flow calculations.
*
* **Korean**: 시간 설정
*
* @param hour - Hour of day (0-23)
* @throws Error if hour is not a finite number
*
* @example
* ```typescript
* vitalPointSystem.setCurrentHour(20); // 8 PM - Pericardium peak time
* ```
*
* @public
* @korean 시간설정
*/
setCurrentHour(hour: number): void {
if (!Number.isFinite(hour)) {
throw new Error("Hour must be a finite number");
}
this.currentHour = Math.max(0, Math.min(23, Math.floor(hour)));
}
/**
* Gets the current hour of day used for meridian calculations.
*
* **Korean**: 현재 시간 조회
*
* @returns Current hour (0-23)
*
* @public
* @korean 시간조회
*/
getCurrentHour(): number {
return this.currentHour;
}
/**
* Updates meridian disruption state for a specific meridian.
*
* **Korean**: 경락 차단 상태 업데이트
*
* @param meridianId - ID of the meridian
* @param disruptionLevel - Disruption level (0-1, where 1 is fully blocked)
*
* @public
* @korean 경락차단업데이트
*/
setMeridianDisruption(meridianId: string, disruptionLevel: number): void {
this.meridianStates.set(
meridianId,
Math.max(0, Math.min(1, disruptionLevel))
);
}
/**
* Gets the current disruption level for a meridian.
*
* **Korean**: 경락 차단 수준 조회
*
* @param meridianId - ID of the meridian
* @returns Disruption level (0-1)
*
* @public
* @korean 경락차단조회
*/
getMeridianDisruption(meridianId: string): number {
return this.meridianStates.get(meridianId) ?? 0;
}
/**
* Clears all meridian disruption states (e.g., after rest or healing).
*
* **Korean**: 경락 상태 초기화
*
* @public
* @korean 경락초기화
*/
clearMeridianDisruptions(): void {
this.meridianStates.clear();
}
/**
* Processes a hit at a specific position to determine vital point impact.
*
* Evaluates whether a strike lands on or near a vital point, calculating
* damage and effects based on accuracy, severity, and meridian flow.
* Supports both targeted strikes (specific vital point ID) and proximity-based detection.
*
* Enhanced with archetype-specific modifiers for realistic combat simulation.
*
* ## Hit Detection Algorithm
*
* 1. If targetedVitalPointId provided, validate that specific point
* 2. Otherwise, find closest vital point to target position
* 3. Calculate distance from strike to vital point
* 4. Apply accuracy falloff based on distance (max 50px)
* 5. Calculate meridian flow bonus based on time of day
* 6. Apply meridian disruption if applicable
* 7. Apply archetype offensive/defensive modifiers
* 8. Apply enhanced vulnerability with stance and anatomical zone
* 9. Return hit result with damage multipliers and effects
*
* @param targetPosition - Position where strike lands
* @param _hitBox - Size of hit box (currently unused, reserved for future)
* @param targetedVitalPointId - Optional specific vital point being targeted
* @param hour - Optional hour of day (0-23) for meridian flow calculation
* @param attackerArchetype - Optional attacker's archetype (default: MUSA)
* @param defenderArchetype - Optional defender's archetype (default: MUSA)
* @param defenderStance - Optional defender's trigram stance (default: GEON)
* @returns Hit result with damage, effects, severity, and meridian multiplier
*
* @example
* ```typescript
* // Proximity-based strike
* const result1 = vitalPointSystem.processHit(
* { x: 100, y: 50 },
* { width: 10, height: 10 }
* );
*
* // Targeted strike with archetype modifiers and stance
* const result2 = vitalPointSystem.processHit(
* { x: 100, y: 50 },
* { width: 10, height: 10 },
* "head_temple",
* 2, // Liver meridian peak hour
* PlayerArchetype.AMSALJA, // Assassin attacker (+30% effect)
* PlayerArchetype.MUSA, // Warrior defender (+20% resistance)
* TrigramStance.GEON // Heaven stance (exposes head +20%)
* );
* ```
*
* @public
* @korean 타격처리
*/
processHit(
targetPosition: Position,
_hitBox: { width: number; height: number }, // Prefixed with underscore to indicate intentionally unused
targetedVitalPointId?: string | null,
hour?: number,
attackerArchetype?: PlayerArchetype,
defenderArchetype?: PlayerArchetype,
defenderStance?: TrigramStance
): VitalPointHitResult {
// Use provided hour or current system hour
const effectiveHour = hour ?? this.currentHour;
const effectiveAttackerArchetype =
attackerArchetype ?? PlayerArchetype.MUSA;
const effectiveDefenderArchetype =
defenderArchetype ?? PlayerArchetype.MUSA;
const effectiveDefenderStance = defenderStance ?? TrigramStance.GEON;
// If a specific vital point is targeted, check that one
if (targetedVitalPointId) {
const targetVitalPoint = this.getVitalPointById(targetedVitalPointId);
if (targetVitalPoint) {
return this.calculateVitalPointHit(
targetVitalPoint,
targetPosition,
effectiveHour,
effectiveAttackerArchetype,
effectiveDefenderArchetype,
effectiveDefenderStance
);
}
}
// Otherwise, find the closest vital point
const closestVitalPoint = this.findClosestVitalPoint(targetPosition);
Iif (!closestVitalPoint) {
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
// Calculate distance to determine hit accuracy
const distance = this.calculateDistance(
targetPosition,
closestVitalPoint.position
);
const maxHitDistance = 50; // pixels
if (distance <= maxHitDistance) {
return this.calculateVitalPointHit(
closestVitalPoint,
targetPosition,
effectiveHour,
effectiveAttackerArchetype,
effectiveDefenderArchetype,
effectiveDefenderStance
);
}
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
/**
* Retrieves a vital point by its unique identifier.
*
* @param id - Vital point identifier (e.g., "GB-20", "head_temple")
* @returns Vital point if found, null otherwise
*
* @example
* ```typescript
* const temple = vitalPointSystem.getVitalPointById("head_temple");
* if (temple) {
* console.log(temple.names.korean); // "태양혈"
* }
* ```
*
* @public
* @korean 급소조회
*/
getVitalPointById(id: string): VitalPoint | null {
return this.vitalPoints.find((vp) => vp.id === id) ?? null;
}
/**
* Gets all registered vital points in the system.
*
* @returns Read-only array of all vital points
*
* @example
* ```typescript
* const allPoints = vitalPointSystem.getVitalPoints();
* console.log(`${allPoints.length} vital points registered`);
* ```
*
* @public
* @korean 급소목록조회
*/
getVitalPoints(): readonly VitalPoint[] {
return this.vitalPoints;
}
/**
* Calculates hit result for a technique-based attack.
*
* Determines whether a technique successfully lands on a vital point,
* factoring in technique accuracy, attacker position, and randomness.
* Used for AI and player technique execution.
*
* @param technique - Technique being executed with accuracy property
* @param attackerPosition - Position where attack originates
* @param _defenderPosition - Defender position (reserved for future use)
* @param _defenderStance - Defender stance (reserved for future use)
* @returns Hit result with damage and effects
*
* @example
* ```typescript
* const technique = {
* id: "geon-thunder-strike",
* accuracy: 0.85
* };
*
* const result = vitalPointSystem.calculateHit(
* technique,
* { x: 100, y: 50 },
* { x: 120, y: 50 },
* TrigramStance.GEON
* );
* ```
*
* @public
* @korean 기술타격계산
*/
calculateHit(
technique: any,
attackerPosition: Position,
_defenderPosition: Position, // Prefixed with underscore to indicate intentionally unused
_defenderStance: any // Prefixed with underscore to indicate intentionally unused
): VitalPointHitResult {
// Find closest vital point to attack
const closestVitalPoint = this.findClosestVitalPoint(attackerPosition);
Iif (!closestVitalPoint) {
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
// Calculate hit based on technique accuracy and distance
const distance = this.calculateDistance(
attackerPosition,
closestVitalPoint.position
);
const hitChance = technique.accuracy * (1 - distance / 100);
if (Math.random() < hitChance) {
return {
hit: true,
vitalPointHit: closestVitalPoint,
damage: this.calculateBaseDamage(closestVitalPoint, distance),
effects: [],
severity: closestVitalPoint.severity,
};
}
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
/**
* Finds the closest vital point to a given position.
*
* Uses Euclidean distance to determine proximity.
*
* @param position - Target position
* @returns Closest vital point or null if none registered
*
* @private
* @korean 최근접급소검색
*/
private findClosestVitalPoint(position: Position): VitalPoint | null {
Iif (this.vitalPoints.length === 0) return null;
let closest = this.vitalPoints[0];
let minDistance = this.calculateDistance(position, closest.position);
for (const vitalPoint of this.vitalPoints) {
const distance = this.calculateDistance(position, vitalPoint.position);
if (distance < minDistance) {
minDistance = distance;
closest = vitalPoint;
}
}
return closest;
}
/**
* Calculates Euclidean distance between two positions.
*
* @param pos1 - First position
* @param pos2 - Second position
* @returns Distance in pixels
*
* @private
* @korean 거리계산
*/
private calculateDistance(pos1: Position, pos2: Position): number {
const dx = pos1.x - pos2.x;
const dy = pos1.y - pos2.y;
return Math.sqrt(dx * dx + dy * dy);
}
/**
* Calculates vital point hit result with accuracy, damage, and meridian effects.
*
* **Korean**: 급소타격결과계산
*
* Enhanced with comprehensive effect calculation including:
* - Duration based on accuracy, severity, and archetype modifiers
* - Intensity scaling with hit accuracy
* - Critical hit bonuses for accuracy >= 0.9
* - Archetype offensive/defensive modifiers
*
* @param vitalPoint - Vital point being struck
* @param hitPosition - Exact position of strike
* @param hour - Hour of day for meridian flow calculation
* @param attackerArchetype - Attacker's archetype (default: MUSA)
* @param defenderArchetype - Defender's archetype (default: MUSA)
* @returns Hit result with calculated damage, accuracy, and meridian bonuses
*
* @private
* @korean 급소타격결과계산
*/
private calculateVitalPointHit(
vitalPoint: VitalPoint,
hitPosition: Position,
hour: number,
attackerArchetype: PlayerArchetype = PlayerArchetype.MUSA,
defenderArchetype: PlayerArchetype = PlayerArchetype.MUSA,
defenderStance: TrigramStance = TrigramStance.GEON
): VitalPointHitResult {
const distance = this.calculateDistance(hitPosition, vitalPoint.position);
const baseDamage = this.calculateBaseDamage(vitalPoint, distance);
const now = Date.now(); // Single timestamp for all effects
// Calculate hit accuracy (0-1 scale based on distance)
const accuracy = Math.max(0, 1 - distance / 50);
// Get meridians for this vital point
const meridians = getMeridiansForVitalPoint(vitalPoint.id);
// Calculate meridian flow effectiveness (highest value if multiple meridians)
let meridianMultiplier = 1.0;
const allMeridianEffects: StatusEffect[] = [];
Eif (meridians.length > 0) {
// Use the best meridian flow multiplier
meridianMultiplier = Math.max(
...meridians.map((meridianId) =>
calculateMeridianFlow(meridianId, hour)
)
);
// Generate meridian disruption effects for each affected meridian
meridians.forEach((meridianId) => {
const currentDisruption = this.getMeridianDisruption(meridianId);
const newDisruption = Math.min(
1,
currentDisruption + DISRUPTION_INCREMENT_PER_HIT
);
this.setMeridianDisruption(meridianId, newDisruption);
// Generate effects if disruption is significant (using shared timestamp)
const effects = generateMeridianEffects(meridianId, newDisruption, now);
allMeridianEffects.push(...effects);
});
}
// Calculate enhanced vulnerability based on anatomical zone, stance, meridian flow, and time
const meridianStates: Record<string, number> = {};
meridians.forEach((meridianId) => {
// Convert disruption (0=normal, 1=blocked) to flow state (1=normal, 0=blocked)
const disruption = this.getMeridianDisruption(meridianId);
meridianStates[meridianId] = 1.0 - disruption;
});
const vulnerabilityMultiplier = calculateEnhancedVulnerability(
vitalPoint.position,
hour,
defenderStance,
meridianStates
);
// Apply all multipliers to damage: base × meridian flow × vulnerability
const finalDamage = Math.floor(
baseDamage * meridianMultiplier * vulnerabilityMultiplier
);
// Convert VitalPointEffect to StatusEffect with comprehensive calculations
const vitalPointStatusEffects: StatusEffect[] = vitalPoint.effects.map(
(effect) =>
convertToStatusEffect(
effect,
accuracy,
vitalPoint.severity,
attackerArchetype,
defenderArchetype,
vitalPoint.id,
now
)
);
// Combine vital point effects with meridian effects
const combinedEffects = [...vitalPointStatusEffects, ...allMeridianEffects];
return {
hit: true,
vitalPointHit: vitalPoint,
damage: finalDamage,
effects: combinedEffects,
severity: vitalPoint.severity,
accuracy,
meridianMultiplier,
meridianEffects: allMeridianEffects,
multiplier: vulnerabilityMultiplier,
};
}
/**
* Calculates base damage for a vital point strike.
*
* Applies distance-based falloff to vital point's base damage value.
* Closer strikes deal more damage up to maximum base damage.
*
* @param vitalPoint - Vital point with base damage property
* @param distance - Distance from strike to vital point center
* @returns Calculated damage value
*
* @private
* @korean 기본피해계산
*/
private calculateBaseDamage(
vitalPoint: VitalPoint,
distance: number
): number {
const baseDamage = vitalPoint.baseDamage ?? 10;
const distanceModifier = Math.max(0.1, 1 - distance / 100);
return Math.floor(baseDamage * distanceModifier);
}
/**
* Initializes the system with comprehensive Korean vital points.
*
* Loads all 70 Korean vital points from the comprehensive database
* covering head, torso, arms, and legs with proper categorization.
*
* @private
* @korean 급소초기화
*/
private initializeVitalPoints(): void {
// Load all 70 vital points from the comprehensive database
this.vitalPoints = [...VITAL_POINTS_DATA];
}
}
export default VitalPointSystem;
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