feat: initial commit

src/utils/rate-limiter.ts

@@ -0,0 +1,49 @@
+const DAILY_LIMIT = 3
+const STORAGE_KEY = "writing-check-usage"
+
+interface UsageRecord {
+  date: string
+  count: number
+}
+
+export function canUseWritingCheck(): boolean {
+  const record = getUsageRecord()
+  const today = getToday()
+  if (record.date !== today) return true
+  return record.count < DAILY_LIMIT
+}
+
+export function recordWritingCheckUsage(): void {
+  const today = getToday()
+  const record = getUsageRecord()
+  if (record.date !== today) {
+    setUsageRecord({ date: today, count: 1 })
+  } else {
+    setUsageRecord({ date: today, count: record.count + 1 })
+  }
+}
+
+export function getRemainingChecks(): number {
+  const record = getUsageRecord()
+  const today = getToday()
+  if (record.date !== today) return DAILY_LIMIT
+  return Math.max(0, DAILY_LIMIT - record.count)
+}
+
+function getToday(): string {
+  return new Date().toISOString().split("T")[0]
+}
+
+function getUsageRecord(): UsageRecord {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY)
+    if (!raw) return { date: "", count: 0 }
+    return JSON.parse(raw) as UsageRecord
+  } catch {
+    return { date: "", count: 0 }
+  }
+}
+
+function setUsageRecord(record: UsageRecord): void {
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(record))
+}