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* Adaptive Difficulty System for Korean Martial Arts Combat
* Tracks player skill metrics and adjusts AI difficulty dynamically
*/
import { AIPersonality } from "./AIPersonality";
/**
* Player skill metrics tracked for adaptive difficulty
*/
export interface PlayerSkillMetrics {
averageAccuracy: number; // 0.0-1.0: Hit rate
comboCount: number; // Total combos executed
perfectBlocks: number; // Perfect timing blocks
reactionTime: number; // Average reaction time in ms
vitalPointHits: number; // Successful vital point strikes
stanceTransitions: number; // Effective stance changes
damageEfficiency: number; // 0.0-1.0: Damage dealt vs taken ratio
matchesPlayed: number; // Total matches for scaling
}
/**
* Difficulty tier levels
*/
export enum DifficultyTier {
BEGINNER = 0,
NOVICE = 1,
INTERMEDIATE = 2,
ADVANCED = 3,
EXPERT = 4,
MASTER = 5,
}
/**
* Adaptive Difficulty System
*/
export class AdaptiveDifficulty {
private playerSkillMetrics: PlayerSkillMetrics;
private readonly skillDecay = 0.95; // Gradual skill decay between matches
private readonly learningRate = 0.1; // How quickly to adapt
constructor() {
this.playerSkillMetrics = {
averageAccuracy: 0.5,
comboCount: 0,
perfectBlocks: 0,
reactionTime: 800,
vitalPointHits: 0,
stanceTransitions: 0,
damageEfficiency: 0.5,
matchesPlayed: 0,
};
}
/**
* Update player skill metrics based on match performance
*/
updateSkillMetrics(matchData: {
hitsLanded: number;
totalAttacks: number;
combosExecuted: number;
perfectBlockCount: number;
avgReactionTimeMs: number;
vitalPointsHit: number;
effectiveStanceChanges: number;
damageDealt: number;
damageTaken: number;
}): void {
const { metrics } = this;
// Update accuracy with learning rate
const matchAccuracy =
matchData.totalAttacks > 0
? matchData.hitsLanded / matchData.totalAttacks
: 0.5;
metrics.averageAccuracy =
metrics.averageAccuracy * (1 - this.learningRate) +
matchAccuracy * this.learningRate;
// Update combo count
metrics.comboCount += matchData.combosExecuted;
// Update perfect blocks
metrics.perfectBlocks += matchData.perfectBlockCount;
// Update reaction time
Eif (matchData.avgReactionTimeMs > 0) {
metrics.reactionTime =
metrics.reactionTime * (1 - this.learningRate) +
matchData.avgReactionTimeMs * this.learningRate;
}
// Update vital point hits
metrics.vitalPointHits += matchData.vitalPointsHit;
// Update stance transitions
metrics.stanceTransitions += matchData.effectiveStanceChanges;
// Update damage efficiency
const matchEfficiency =
matchData.damageTaken > 0
? Math.min(1, matchData.damageDealt / matchData.damageTaken)
: matchData.damageDealt > 0
? 1.0 // Perfect defense with damage dealt
: 0.5; // No damage on either side
metrics.damageEfficiency =
metrics.damageEfficiency * (1 - this.learningRate) +
matchEfficiency * this.learningRate;
// Increment matches played
metrics.matchesPlayed += 1;
// Apply skill decay to prevent over-adjustment
this.applySkillDecay();
}
/**
* Apply gradual skill decay to prevent over-adjustment
*/
private applySkillDecay(): void {
const { metrics } = this;
metrics.averageAccuracy =
metrics.averageAccuracy * this.skillDecay +
0.5 * (1 - this.skillDecay);
metrics.damageEfficiency =
metrics.damageEfficiency * this.skillDecay +
0.5 * (1 - this.skillDecay);
}
/**
* Calculate overall player skill level (0.0 - 1.0)
*/
calculatePlayerSkill(): number {
const { metrics } = this;
// Weight different skill components
const accuracyScore = metrics.averageAccuracy * 0.3;
const comboScore = Math.min(1, metrics.comboCount / 20) * 0.2;
const blockScore = Math.min(1, metrics.perfectBlocks / 10) * 0.2;
const reactionScore = Math.max(0, 1 - metrics.reactionTime / 1000) * 0.15;
const vitalScore = Math.min(1, metrics.vitalPointHits / 15) * 0.15;
return accuracyScore + comboScore + blockScore + reactionScore + vitalScore;
}
/**
* Get current difficulty tier
*/
getDifficultyTier(): DifficultyTier {
const skillLevel = this.calculatePlayerSkill();
if (skillLevel < 0.2) return DifficultyTier.BEGINNER;
if (skillLevel < 0.4) return DifficultyTier.NOVICE;
Iif (skillLevel < 0.6) return DifficultyTier.INTERMEDIATE;
Iif (skillLevel < 0.75) return DifficultyTier.ADVANCED;
if (skillLevel < 0.9) return DifficultyTier.EXPERT;
return DifficultyTier.MASTER;
}
/**
* Adjust AI personality based on player skill
*/
adjustAIPersonality(personality: AIPersonality): AIPersonality {
const skillLevel = this.calculatePlayerSkill();
const tier = this.getDifficultyTier();
// Scale factors based on difficulty tier
const aggressionScale = 1 + tier * 0.1; // +10% per tier
const feintScale = 1 + tier * 0.15; // +15% per tier
const comboScale = 1 + tier * 0.12; // +12% per tier
const stanceScale = 1 + tier * 0.08; // +8% per tier
return {
...personality,
aggressionLevel: Math.min(
0.95,
personality.aggressionLevel * aggressionScale
),
feintChance: Math.min(0.6, personality.feintChance * feintScale),
comboTendency: Math.min(0.85, personality.comboTendency * comboScale),
stanceSwitchFrequency: Math.min(
0.9,
personality.stanceSwitchFrequency * stanceScale
),
// Adjust retreat threshold - better players face more aggressive AI
tacticalRetreatThreshold: Math.max(
0.1,
personality.tacticalRetreatThreshold * (1 - skillLevel * 0.3)
),
};
}
/**
* Get skill metrics
*/
getMetrics(): Readonly<PlayerSkillMetrics> {
return { ...this.playerSkillMetrics };
}
/**
* Reset skill metrics
*/
reset(): void {
this.playerSkillMetrics = {
averageAccuracy: 0.5,
comboCount: 0,
perfectBlocks: 0,
reactionTime: 800,
vitalPointHits: 0,
stanceTransitions: 0,
damageEfficiency: 0.5,
matchesPlayed: 0,
};
}
/**
* Get difficulty adjustment recommendation
*/
getDifficultyRecommendation(): {
tier: DifficultyTier;
tierName: string;
skillLevel: number;
shouldIncrease: boolean;
message: string;
} {
const skillLevel = this.calculatePlayerSkill();
const tier = this.getDifficultyTier();
const shouldIncrease = skillLevel > 0.7 && tier < DifficultyTier.MASTER;
const tierNames = [
"Beginner (초보)",
"Novice (입문)",
"Intermediate (중급)",
"Advanced (고급)",
"Expert (전문)",
"Master (달인)",
];
let message = "";
if (shouldIncrease) {
message = "Player shows mastery - increasing difficulty";
} else if (skillLevel < 0.3) {
message = "Player struggling - maintaining current difficulty";
} else E{
message = "Player performing well - difficulty appropriate";
}
return {
tier,
tierName: tierNames[tier],
skillLevel,
shouldIncrease,
message,
};
}
/**
* Export metrics for persistence
*/
exportMetrics(): string {
return JSON.stringify(this.playerSkillMetrics);
}
/**
* Import metrics from persistence
*/
importMetrics(data: string): boolean {
try {
const metrics = JSON.parse(data) as PlayerSkillMetrics;
this.playerSkillMetrics = metrics;
return true;
} catch {
return false;
}
}
/**
* Get reference to metrics (for internal use)
*/
private get metrics(): PlayerSkillMetrics {
return this.playerSkillMetrics;
}
}
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