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import { StanceLaterality } from "./types";
/**
* Enhanced stance effectiveness matrix for Korean martial arts
* Based on traditional I-Ching trigram relationships
*/
const STANCE_EFFECTIVENESS_MATRIX: Record<
TrigramStance,
Partial<Record<TrigramStance, number>>
> = {
[TrigramStance.GEON]: { [TrigramStance.GON]: 1.2, [TrigramStance.SON]: 0.8 },
[TrigramStance.GON]: { [TrigramStance.GEON]: 0.8, [TrigramStance.GAM]: 1.2 },
[TrigramStance.TAE]: { [TrigramStance.JIN]: 1.2, [TrigramStance.GAN]: 0.8 },
[TrigramStance.JIN]: { [TrigramStance.TAE]: 0.8, [TrigramStance.SON]: 1.2 },
[TrigramStance.LI]: { [TrigramStance.GAM]: 0.8, [TrigramStance.TAE]: 0.8 },
[TrigramStance.GAM]: {
// water extinguishes fire:
[TrigramStance.LI]: 1.2,
[TrigramStance.GON]: 0.8,
},
[TrigramStance.SON]: { [TrigramStance.GEON]: 1.2, [TrigramStance.JIN]: 0.8 },
[TrigramStance.GAN]: { [TrigramStance.TAE]: 1.2, [TrigramStance.LI]: 0.8 },
};
export class TrigramCalculator {
/**
* Calculate effectiveness of one stance against another
*/
calculateStanceEffectiveness(
attackerStance: TrigramStance,
defenderStance: TrigramStance
): number {
if (attackerStance === defenderStance) {
return 1.0; // Neutral when same stance
}
const effectiveness =
STANCE_EFFECTIVENESS_MATRIX[attackerStance]?.[defenderStance];
return effectiveness ?? 1.0; // Default to neutral if no specific relationship
}
/**
* Get the optimal counter stance for a given stance
*/
getCounterStance(targetStance: TrigramStance): TrigramStance {
let bestCounter = TrigramStance.GEON;
let bestEffectiveness = 0;
// Find stance with highest effectiveness against target
for (const stance of Object.values(TrigramStance)) {
const effectiveness = this.calculateStanceEffectiveness(
stance,
targetStance
);
if (effectiveness > bestEffectiveness) {
bestEffectiveness = effectiveness;
bestCounter = stance;
}
}
return bestCounter;
}
/**
* Calculate transition difficulty between stances
*/
calculateTransitionDifficulty(
fromStance: TrigramStance,
toStance: TrigramStance
): number {
if (fromStance === toStance) return 0;
// Base difficulty for any transition
const baseDifficulty = 0.5;
// Get stance order for adjacency calculation
const stanceOrder = Object.values(TrigramStance);
const fromIndex = stanceOrder.indexOf(fromStance);
const toIndex = stanceOrder.indexOf(toStance);
if (fromIndex === -1 || toIndex === -1) {
return 1.0; // Unknown stances, high difficulty
}
// Calculate distance (adjacent stances are easier)
const distance = Math.min(
Math.abs(toIndex - fromIndex),
stanceOrder.length - Math.abs(toIndex - fromIndex)
);
// Normalize distance to 0-1 range and add base difficulty
const normalizedDistance = distance / (stanceOrder.length / 2);
return baseDifficulty + normalizedDistance * 0.5;
}
/**
* Calculate stance effectiveness between attacker and defender
*/
static calculateStanceEffectiveness(
attackerStance: TrigramStance,
defenderStance: TrigramStance
): number {
// Use the effectiveness matrix from constants
const effectiveness =
STANCE_EFFECTIVENESS_MATRIX[attackerStance]?.[defenderStance];
return effectiveness ?? 1.0; // Default neutral effectiveness
}
/**
* Get optimal counter stance against opponent stance
*/
static getCounterStance(opponentStance: TrigramStance): TrigramStance {
// Find the stance that has highest effectiveness against opponent
const stances = Object.values(TrigramStance);
let bestCounter = TrigramStance.GEON;
let bestEffectiveness = 0;
stances.forEach((stance) => {
const effectiveness = this.calculateStanceEffectiveness(
stance,
opponentStance
);
if (effectiveness > bestEffectiveness) {
bestEffectiveness = effectiveness;
bestCounter = stance;
}
});
return bestCounter;
}
/**
* Calculate difficulty of transitioning between stances
*/
static calculateTransitionDifficulty(
fromStance: TrigramStance,
toStance: TrigramStance
): number {
if (fromStance === toStance) {
return 0; // No transition needed
}
// Base difficulty for any transition
const baseDifficulty = 0.5;
// Get stance order for adjacency calculation
const stanceOrder = Object.values(TrigramStance);
const fromIndex = stanceOrder.indexOf(fromStance);
const toIndex = stanceOrder.indexOf(toStance);
Iif (fromIndex === -1 || toIndex === -1) {
return 1.0; // Unknown stances, high difficulty
}
// Calculate distance (adjacent stances are easier)
const distance = Math.min(
Math.abs(toIndex - fromIndex),
stanceOrder.length - Math.abs(toIndex - fromIndex)
);
// Normalize distance to 0-1 range and add base difficulty
const normalizedDistance = distance / (stanceOrder.length / 2);
return baseDifficulty + normalizedDistance * 0.5;
}
/**
* Calculate laterality modifier based on stance matching.
*
* In Korean martial arts, matched stances (both fighters in same laterality)
* create tactical advantages for mid-level attacks as centerlines are more exposed.
* Mismatched stances (opposite laterality) provide defensive advantages as lead guards
* naturally protect the centerline.
*
* @param attackerLaterality - Attacker's stance laterality (left or right)
* @param defenderLaterality - Defender's stance laterality (left or right)
* @param attackLevel - Attack level: "high", "mid", or "low"
* @returns Damage multiplier (1.0 = neutral, >1.0 = advantage, <1.0 = disadvantage)
*
* @example
* ```typescript
* // Matched stances: attacker gains mid-level advantage
* const modifier = TrigramCalculator.calculateLateralityModifier("left", "left", "mid");
* // Returns 1.15 (+15% effectiveness)
*
* // Mismatched stances: defender's guard protects centerline
* const modifier = TrigramCalculator.calculateLateralityModifier("left", "right", "mid");
* // Returns 0.90 (-10% effectiveness)
* ```
*
* @public
* @korean 측면성수정자계산
*/
static calculateLateralityModifier(
attackerLaterality: StanceLaterality,
defenderLaterality: StanceLaterality,
attackLevel: "high" | "mid" | "low" = "mid"
): number {
const isMatched = attackerLaterality === defenderLaterality;
// Laterality primarily affects mid-level attacks (centerline attacks)
if (attackLevel === "mid") {
// Matched stances: Open centerline = offensive advantage
// Mismatched stances: Protected centerline = defensive advantage
return isMatched ? 1.15 : 0.90;
}
// High and low attacks less affected by laterality
// Slight tactical variation still exists
if (attackLevel === "high") {
return isMatched ? 1.05 : 0.98;
}
if (attackLevel === "low") {
return isMatched ? 1.03 : 0.99;
}
// Default neutral
return 1.0;
}
} // end of class
export { STANCE_EFFECTIVENESS_MATRIX };
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