151 lines
3.8 KiB
TypeScript
151 lines
3.8 KiB
TypeScript
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Fluxer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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import {LIMIT_KEY_SCOPES, LIMIT_KEYS, type LimitKey, type LimitScope} from '@fluxer/constants/src/LimitConfigMetadata';
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import type {EvaluationContext, LimitFilter, LimitMatchContext, LimitRule} from '@fluxer/limits/src/LimitTypes';
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interface RankedRule {
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rule: LimitRule;
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specificity: number;
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originalIndex: number;
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}
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function areRequiredEntriesPresent(required: Array<string> | undefined, available: Set<string>): boolean {
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if (!required || required.length === 0) {
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return true;
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}
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for (const entry of required) {
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if (!available.has(entry)) {
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return false;
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}
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}
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return true;
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}
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function shouldApplyLimitForContext(
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scope: LimitScope,
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evaluationContext: EvaluationContext,
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hasTraitFilters: boolean,
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hasGuildFilters: boolean,
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): boolean {
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if (evaluationContext === 'user') {
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return scope === 'user' || scope === 'both';
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}
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if (scope === 'both') {
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return true;
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}
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if (scope === 'user') {
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return !hasGuildFilters;
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}
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if (hasGuildFilters) {
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return true;
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}
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return !hasTraitFilters;
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}
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function isValidLimitValue(value: number | undefined): value is number {
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if (typeof value !== 'number') {
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return false;
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}
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if (!Number.isFinite(value)) {
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return false;
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}
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return value >= 0;
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}
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export function ruleMatches(filters: LimitFilter | undefined, ctx: LimitMatchContext): boolean {
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if (!filters) {
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return true;
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}
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if (!areRequiredEntriesPresent(filters.traits, ctx.traits)) {
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return false;
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}
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if (!areRequiredEntriesPresent(filters.guildFeatures, ctx.guildFeatures)) {
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return false;
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}
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return true;
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}
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export function calculateSpecificity(filters: LimitFilter | undefined): number {
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if (!filters) {
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return 0;
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}
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const traitCount = filters.traits?.length ?? 0;
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const guildFeatureCount = filters.guildFeatures?.length ?? 0;
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return traitCount + guildFeatureCount;
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}
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export function compareSpecificity(a: LimitFilter | undefined, b: LimitFilter | undefined): number {
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return calculateSpecificity(a) - calculateSpecificity(b);
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}
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export function sortRulesBySpecificity(rules: Array<LimitRule>): Array<LimitRule> {
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const rankedRules: Array<RankedRule> = rules.map((rule, index) => ({
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rule,
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specificity: calculateSpecificity(rule.filters),
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originalIndex: index,
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}));
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rankedRules.sort((a, b) => {
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if (a.specificity !== b.specificity) {
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return a.specificity - b.specificity;
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}
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return a.originalIndex - b.originalIndex;
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});
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return rankedRules.map((rankedRule) => rankedRule.rule);
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}
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export function applyRuleToResolvedLimits(
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resolved: Record<LimitKey, number>,
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rule: LimitRule,
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evaluationContext: EvaluationContext,
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): void {
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const hasGuildFilters = (rule.filters?.guildFeatures?.length ?? 0) > 0;
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const hasTraitFilters = (rule.filters?.traits?.length ?? 0) > 0;
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for (const key of LIMIT_KEYS) {
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const value = rule.limits[key];
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if (!isValidLimitValue(value)) {
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continue;
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}
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const scope = LIMIT_KEY_SCOPES[key];
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if (!shouldApplyLimitForContext(scope, evaluationContext, hasTraitFilters, hasGuildFilters)) {
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continue;
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}
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const currentValue = resolved[key] ?? 0;
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resolved[key] = Math.max(currentValue, value);
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}
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}
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