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79 lines
2.6 KiB
79 lines
2.6 KiB
import { RankDataManager } from '../../../manager/RankDataManager';
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import { aiLog } from './AiLog';
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/** 普通字策略类型（Rank.aiusetext 两档） */
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export enum AiTextPolicyType {
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/** 类型 1：等级优先 */
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Type1 = 1,
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/** 类型 2：单字冲级 */
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Type2 = 2,
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}
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/** 开战时按对手段位权重抽样，整局固定 */
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export interface AiBattlePersonality {
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/** 本局普通字策略类型 */
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readonly textPolicy: AiTextPolicyType;
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}
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/** 从 Rank.aiusetext 加权抽样整局策略 */
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export class AiBattlePersonalityFactory {
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/**
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* 按对手段位配表抽样 personality。
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* @param opponentRankId 对手段位 id
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* @param seed 随机种子
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*/
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roll(opponentRankId: number, seed: number): AiBattlePersonality | null {
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const rank = RankDataManager.getRankConfig(opponentRankId);
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if (!rank) {
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console.warn('[AiBattlePersonalityFactory] Rank missing，使用默认策略', opponentRankId);
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return {
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textPolicy: AiTextPolicyType.Type1,
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};
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}
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const text = this._pickType(rank.aiusetext, 2, seed ^ 0x85ebca6b, 1);
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if (text == null) {
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console.warn('[AiBattlePersonalityFactory] 权重无效，使用默认策略', opponentRankId);
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return {
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textPolicy: AiTextPolicyType.Type1,
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};
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}
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return {
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textPolicy: text as AiTextPolicyType,
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};
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}
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/**
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* 加权抽类型（返回 1-based 类型号）。
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* @param weights 权重数组
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* @param expectLen 期望长度
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* @param seed 种子
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* @param typeBase 起始类型号
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*/
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private _pickType(weights: number[] | undefined, expectLen: number, seed: number, typeBase: number): number | null {
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if (!weights || weights.length !== expectLen) {
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aiLog('[AiBattlePersonalityFactory] weight length invalid', expectLen);
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return null;
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}
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const w: number[] = [];
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let total = 0;
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for (let i = 0; i < expectLen; i++) {
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const v = Math.max(0, Math.floor(Number(weights[i]) || 0));
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w.push(v);
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total += v;
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}
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if (total <= 0) {
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aiLog('[AiBattlePersonalityFactory] weight total <= 0');
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return null;
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}
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let x = (Math.floor(Number(seed) || 0) >>> 0) || 1;
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x ^= x << 13;
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x ^= x >>> 17;
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x ^= x << 5;
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let roll = ((x >>> 0) / 4294967296) * total;
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for (let i = 0; i < expectLen; i++) {
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roll -= w[i];
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if (roll < 0) return typeBase + i;
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}
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return typeBase + expectLen - 1;
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}
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}
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