77 lines
2.5 KiB
TypeScript
77 lines
2.5 KiB
TypeScript
export type BucketUsageBucket = {
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tags: string[];
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necessity: "NECESSARY" | "BOTH" | "UNNECESSARY";
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windowDays: number;
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};
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export type BucketUsageEntry = {
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amountDollars: number;
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occurredAt: string | Date;
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necessity: "NECESSARY" | "BOTH" | "UNNECESSARY";
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tags: string[];
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isRecurring: boolean;
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entryType?: "SPENDING" | "INCOME";
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};
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const MS_PER_DAY = 24 * 60 * 60 * 1000;
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function toDateOnly(value: string | Date) {
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if (value instanceof Date) {
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return new Date(Date.UTC(value.getUTCFullYear(), value.getUTCMonth(), value.getUTCDate()));
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}
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if (!value) return null;
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const parsed = new Date(`${value}T00:00:00Z`);
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if (Number.isNaN(parsed.getTime())) return null;
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return parsed;
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}
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function daysBetween(today: Date, occurred: Date) {
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return Math.floor((today.getTime() - occurred.getTime()) / MS_PER_DAY);
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}
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function hasAllTags(bucketTags: string[], entryTags: string[]) {
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if (!bucketTags.length) return true;
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if (!entryTags.length) return false;
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const entrySet = new Set(entryTags.map(tag => tag.toLowerCase()));
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return bucketTags.every(tag => entrySet.has(tag.toLowerCase()));
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}
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export function calculateBucketUsage(bucket: BucketUsageBucket, entries: BucketUsageEntry[], today: string | Date) {
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const windowDays = Number(bucket.windowDays || 0);
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if (!Number.isFinite(windowDays) || windowDays <= 0)
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return { totalUsage: 0, matchedCount: 0 };
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const todayDate = toDateOnly(today);
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if (!todayDate) return { totalUsage: 0, matchedCount: 0 };
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const bucketNecessity = bucket.necessity;
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let totalUsage = 0;
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let matchedCount = 0;
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entries.forEach(entry => {
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if (entry.entryType && entry.entryType !== "SPENDING") return;
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if (entry.isRecurring) return;
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if (!hasAllTags(bucket.tags || [], entry.tags || [])) return;
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const occurred = toDateOnly(entry.occurredAt);
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if (!occurred) return;
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const diffDays = daysBetween(todayDate, occurred);
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if (diffDays < 0 || diffDays > windowDays - 1) return;
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const entryNecessity = entry.necessity;
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if (bucketNecessity !== "BOTH") {
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if (entryNecessity === "BOTH") {
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totalUsage += entry.amountDollars / 2;
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matchedCount += 1;
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return;
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}
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if (entryNecessity !== bucketNecessity) return;
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}
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totalUsage += entry.amountDollars;
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matchedCount += 1;
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});
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return { totalUsage, matchedCount };
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}
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