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* Combat State System for managing Ready/Shaken/Vulnerable/Helpless states.
*
* **Korean**: 전투 상태 시스템 (Combat State System)
*
* Implements the combat readiness state machine based on cumulative damage,
* pain, consciousness, and balance. Each state affects player capabilities
* with specific multipliers.
*
* ## Combat States
*
* - **🟢 READY**: 100% capability - perfect combat condition
* - **🟡 SHAKEN**: 80% capability - slightly compromised, -20% accuracy
* - **🟠 VULNERABLE**: 60% capability - significantly exposed, -40% defense
* - **🔴 HELPLESS**: 20% capability - near incapacitation, cannot block
*
* @module systems/combat/CombatStateSystem
* @category Combat System
* @korean 전투상태시스템
*/
import { PlayerState } from "../player";
/**
* Combat readiness states representing player combat effectiveness.
*
* **Korean**: 전투 준비 상태
*/
export enum CombatReadinessState {
/** 🟢 Ready - Full combat capability (100%) */
READY = "ready",
/** 🟡 Shaken - Reduced effectiveness (80%) */
SHAKEN = "shaken",
/** 🟠 Vulnerable - Significantly impaired (60%) */
VULNERABLE = "vulnerable",
/** 🔴 Helpless - Near incapacitation (20%) */
HELPLESS = "helpless",
}
/**
* State capability modifiers for each combat state.
*
* **Korean**: 상태 능력 배율
*/
interface StateCapability {
/** Overall capability percentage */
readonly capability: number;
/** Accuracy modifier (affects hit chance and damage output) */
readonly accuracyModifier: number;
/** Defense modifier (affects damage reduction) */
readonly defenseModifier: number;
/** Damage modifier (affects outgoing damage) */
readonly damageModifier: number;
/** Damage taken multiplier (affects incoming damage) */
readonly damageTakenMultiplier: number;
/** Movement speed modifier */
readonly speedModifier: number;
/** Can perform blocking actions */
readonly canBlock: boolean;
/** Can execute techniques */
readonly canExecuteTechniques: boolean;
}
/**
* Combat State System managing readiness state transitions.
*
* Evaluates player condition and determines current combat readiness state.
* States degrade based on:
* - Cumulative damage (health loss)
* - Pain overload
* - Consciousness reduction
* - Balance disruption
*
* @example
* ```typescript
* const combatStateSystem = new CombatStateSystem();
*
* // Determine current state
* const state = combatStateSystem.determineState(player);
*
* // Get capability modifiers
* const capability = combatStateSystem.getCapability(state);
* console.log(`Capability: ${capability.capability}%`);
*
* // Apply modifiers to damage calculation
* const modifiedDamage = baseDamage * capability.accuracyModifier;
* ```
*
* @public
* @korean 전투상태시스템
*/
export class CombatStateSystem {
/**
* State capability definitions with modifiers per state.
*
* Based on acceptance criteria:
* - READY: 100% capability (baseline)
* - SHAKEN: -15% accuracy, -10% damage
* - VULNERABLE: -30% accuracy, -25% damage, +50% damage taken
* - HELPLESS: Cannot attack, cannot block, +100% damage taken
*/
private readonly stateCapabilities: Record<CombatReadinessState, StateCapability> = {
[CombatReadinessState.READY]: {
capability: 1.0, // 100%
accuracyModifier: 1.0,
defenseModifier: 1.0,
damageModifier: 1.0,
damageTakenMultiplier: 1.0, // Normal damage taken
speedModifier: 1.0,
canBlock: true,
canExecuteTechniques: true,
},
[CombatReadinessState.SHAKEN]: {
capability: 0.85, // 85%
accuracyModifier: 0.85, // -15% accuracy
defenseModifier: 1.0,
damageModifier: 0.9, // -10% damage
damageTakenMultiplier: 1.0, // Normal damage taken
speedModifier: 0.95,
canBlock: true,
canExecuteTechniques: true,
},
[CombatReadinessState.VULNERABLE]: {
capability: 0.7, // 70%
accuracyModifier: 0.7, // -30% accuracy
defenseModifier: 0.75,
damageModifier: 0.75, // -25% damage
damageTakenMultiplier: 1.5, // +50% damage taken
speedModifier: 0.8,
canBlock: true,
canExecuteTechniques: true,
},
[CombatReadinessState.HELPLESS]: {
capability: 0.0, // 0%
accuracyModifier: 0.0, // Cannot attack
defenseModifier: 0.0,
damageModifier: 0.0, // Cannot attack
damageTakenMultiplier: 2.0, // +100% damage taken (2x)
speedModifier: 0.3,
canBlock: false, // Cannot block
canExecuteTechniques: false,
},
};
/**
* Determines the current combat readiness state based on player condition.
*
* Evaluates health, pain, consciousness, balance, and recent hits to determine
* the most appropriate combat state. State transitions follow acceptance criteria:
* - READY → SHAKEN: After taking 2-3 hits or significant vital point strike
* - SHAKEN → VULNERABLE: After additional 2 hits or loss of 30% body part health
* - VULNERABLE → HELPLESS: After head trauma, pain >80, or knock-down
* - Recovery: HELPLESS → READY over 5 seconds if no additional hits
*
* @param player - Current player state
* @param currentTime - Current timestamp in milliseconds
* @returns Current combat readiness state
*
* @example
* ```typescript
* const state = combatStateSystem.determineState(player, Date.now());
* if (state === CombatReadinessState.HELPLESS) {
* console.log("Player is near incapacitation!");
* }
* ```
*
* @public
* @korean 상태결정
*/
determineState(player: PlayerState, currentTime?: number): CombatReadinessState {
const healthPercent = player.health / player.maxHealth;
const pain = player.pain;
const consciousness = player.consciousness;
const balance = player.balance;
// Count recent hits (within last 10 seconds)
const recentHits = this.countRecentHits(player, currentTime, 10000);
// Check for recovery from HELPLESS state
// If player was helpless and recovery conditions are met, allow normal state determination
// Recovery overrides low stats if enough time has passed without hits
if (player.lastHelplessStateTime && currentTime) {
const timeSinceHelpless = currentTime - player.lastHelplessStateTime;
const noRecentHits = this.countRecentHits(player, currentTime, 5000) === 0;
// Recovery: HELPLESS → normal state after 5 seconds if no additional hits
if (timeSinceHelpless >= 5000 && noRecentHits) {
// Player has recovered - skip HELPLESS check and determine state normally
// This allows recovery even if stats are still low
// Continue to normal state determination below
I} else if (timeSinceHelpless < 5000) {
// Still in recovery period, check if should remain HELPLESS
const stillCritical = healthPercent <= 0.3 || pain > 80 || consciousness <= 20 || balance <= 20;
if (stillCritical) {
return CombatReadinessState.HELPLESS;
}
}
}
// Check for HELPLESS state (worst condition) - only if not in recovery
// Triggers: health <= 30%, pain > 80, consciousness <= 20, balance <= 20, or head trauma
const hasHeadTrauma = player.bodyPartHealth
? (player.bodyPartHealth.head / (player.bodyPartMaxHealth?.head ?? 100)) < 0.5
: false;
// Only enter HELPLESS if not already recovering
const isRecovering = player.lastHelplessStateTime && currentTime
&& (currentTime - player.lastHelplessStateTime) >= 5000
&& this.countRecentHits(player, currentTime, 5000) === 0;
if (!isRecovering && (
healthPercent <= 0.3 ||
pain > 80 ||
consciousness <= 20 ||
balance <= 20 ||
hasHeadTrauma
)) {
return CombatReadinessState.HELPLESS;
}
// Check for VULNERABLE state
// Triggers: health <= 50%, pain > 60, consciousness <= 40, balance <= 40,
// or 30% body part health loss
const hasBodyPartDamage = this.checkBodyPartHealthLoss(player, 0.3);
if (
healthPercent <= 0.5 ||
pain > 60 ||
consciousness <= 40 ||
balance <= 40 ||
hasBodyPartDamage ||
recentHits >= 4 // Additional 2 hits from SHAKEN (total 4-5 hits)
) {
return CombatReadinessState.VULNERABLE;
}
// Check for SHAKEN state
// Triggers: health <= 70%, pain > 30, consciousness <= 60, balance <= 60,
// or 2-3 recent hits
if (
healthPercent <= 0.7 ||
pain > 30 ||
consciousness <= 60 ||
balance <= 60 ||
recentHits >= 2 // 2-3 hits triggers SHAKEN
) {
return CombatReadinessState.SHAKEN;
}
// Default to READY state
return CombatReadinessState.READY;
}
/**
* Gets the capability modifiers for a specific combat state.
*
* Returns all modifiers that should be applied to player actions
* based on their current combat readiness.
*
* @param state - Combat readiness state
* @returns Capability modifiers for the state
*
* @example
* ```typescript
* const capability = combatStateSystem.getCapability(
* CombatReadinessState.SHAKEN
* );
*
* // Apply to damage calculation
* const finalDamage = baseDamage * capability.accuracyModifier;
*
* // Check if can block
* if (!capability.canBlock) {
* console.log("Cannot block in this state!");
* }
* ```
*
* @public
* @korean 능력조회
*/
getCapability(state: CombatReadinessState): StateCapability {
return this.stateCapabilities[state];
}
/**
* Applies combat state modifiers to a player state.
*
* Creates a modified player state with capability reductions
* based on current combat readiness.
*
* @param player - Current player state
* @param state - Combat readiness state to apply
* @returns Modified player state with applied modifiers
*
* @example
* ```typescript
* const state = combatStateSystem.determineState(player);
* const modifiedPlayer = combatStateSystem.applyStateModifiers(
* player,
* state
* );
* ```
*
* @public
* @korean 상태적용
*/
applyStateModifiers(
player: PlayerState,
state: CombatReadinessState
): PlayerState {
const capability = this.getCapability(state);
return {
...player,
attackPower: Math.floor(player.attackPower * capability.damageModifier),
defense: Math.floor(player.defense * capability.defenseModifier),
speed: Math.floor(player.speed * capability.speedModifier),
isBlocking: player.isBlocking && capability.canBlock,
isStunned: player.isStunned || !capability.canExecuteTechniques,
};
}
/**
* Gets bilingual name for combat state.
*
* @param state - Combat readiness state
* @returns Korean and English state names
*
* @public
* @korean 상태이름
*/
getStateName(state: CombatReadinessState): { korean: string; english: string } {
const names: Record<CombatReadinessState, { korean: string; english: string }> = {
[CombatReadinessState.READY]: {
korean: "준비완료",
english: "Ready",
},
[CombatReadinessState.SHAKEN]: {
korean: "동요상태",
english: "Shaken",
},
[CombatReadinessState.VULNERABLE]: {
korean: "취약상태",
english: "Vulnerable",
},
[CombatReadinessState.HELPLESS]: {
korean: "무력상태",
english: "Helpless",
},
};
return names[state];
}
/**
* Gets emoji indicator for combat state.
*
* @param state - Combat readiness state
* @returns Emoji representing the state
*
* @public
* @korean 상태아이콘
*/
getStateEmoji(state: CombatReadinessState): string {
const emojis: Record<CombatReadinessState, string> = {
[CombatReadinessState.READY]: "🟢",
[CombatReadinessState.SHAKEN]: "🟡",
[CombatReadinessState.VULNERABLE]: "🟠",
[CombatReadinessState.HELPLESS]: "🔴",
};
return emojis[state];
}
/**
* Counts recent hits within a time window.
*
* @param player - Current player state
* @param currentTime - Current timestamp (milliseconds)
* @param timeWindow - Time window to check in milliseconds
* @returns Number of hits within the time window
*
* @private
* @korean 최근타격횟수
*/
private countRecentHits(
player: PlayerState,
currentTime: number | undefined,
timeWindow: number
): number {
if (!currentTime || !player.recentHitTimestamps) {
return 0;
}
const cutoffTime = currentTime - timeWindow;
return player.recentHitTimestamps.filter(
(timestamp) => timestamp >= cutoffTime
).length;
}
/**
* Checks if any body part has lost more than the specified percentage of health.
*
* @param player - Current player state
* @param lossThreshold - Health loss threshold (0.0 to 1.0)
* @returns True if any body part has lost more than the threshold
*
* @private
* @korean 신체부위손상확인
*/
private checkBodyPartHealthLoss(
player: PlayerState,
lossThreshold: number
): boolean {
if (!player.bodyPartHealth || !player.bodyPartMaxHealth) {
return false;
}
const bodyParts: Array<keyof typeof player.bodyPartHealth> = [
"head",
"neck",
"torsoUpper",
"torsoLower",
"armLeft",
"armRight",
"legLeft",
"legRight",
];
for (const part of bodyParts) {
const current = player.bodyPartHealth[part];
const max = player.bodyPartMaxHealth[part];
const healthPercent = current / max;
const lossPercent = 1 - healthPercent;
if (lossPercent >= lossThreshold) {
return true;
}
}
return false;
}
/**
* Records a hit on the player and updates recent hit tracking.
*
* Should be called by combat system when player takes a hit.
* Maintains a rolling window of the last 10 hit timestamps.
*
* @param player - Current player state
* @param currentTime - Timestamp of the hit
* @returns Updated player state with recorded hit
*
* @public
* @korean 타격기록
*/
recordHit(player: PlayerState, currentTime: number): PlayerState {
const recentHits = player.recentHitTimestamps ?? [];
// Add new hit timestamp and keep only last 10
const updatedHits = [...recentHits, currentTime].slice(-10);
return {
...player,
recentHitTimestamps: updatedHits,
hitsTaken: player.hitsTaken + 1,
};
}
/**
* Updates player when entering HELPLESS state.
*
* Records the timestamp for recovery tracking.
*
* @param player - Current player state
* @param currentTime - Timestamp when entering helpless state
* @returns Updated player state
*
* @public
* @korean 무력상태기록
*/
enterHelplessState(player: PlayerState, currentTime: number): PlayerState {
return {
...player,
lastHelplessStateTime: currentTime,
};
}
/**
* Checks if player can recover from HELPLESS state.
*
* Recovery occurs after 5 seconds with no additional hits.
*
* @param player - Current player state
* @param currentTime - Current timestamp
* @returns True if recovery is possible
*
* @public
* @korean 회복가능확인
*/
canRecoverFromHelpless(player: PlayerState, currentTime: number): boolean {
if (!player.lastHelplessStateTime) {
return false;
}
const timeSinceHelpless = currentTime - player.lastHelplessStateTime;
const noRecentHits = this.countRecentHits(player, currentTime, 5000) === 0;
return timeSinceHelpless >= 5000 && noRecentHits;
}
}
export default CombatStateSystem;
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