Init commit

server/core/lib/timeserie.ts

@@ -0,0 +1,61 @@
+import { logger } from '@server/helpers/logger.js'
+
+function buildGroupByAndBoundaries (startDateString: string, endDateString: string) {
+  const startDate = new Date(startDateString)
+  const endDate = new Date(endDateString)
+
+  const groupInterval = buildGroupInterval(startDate, endDate)
+
+  logger.debug('Found "%s" group interval.', groupInterval, { startDate, endDate })
+
+  // Remove parts of the date we don't need
+  if (groupInterval.endsWith(' month') || groupInterval.endsWith(' months')) {
+    startDate.setDate(1)
+    startDate.setHours(0, 0, 0, 0)
+  } else if (groupInterval.endsWith(' day') || groupInterval.endsWith(' days')) {
+    startDate.setHours(0, 0, 0, 0)
+  } else if (groupInterval.endsWith(' hour') || groupInterval.endsWith(' hours')) {
+    startDate.setMinutes(0, 0, 0)
+  } else {
+    startDate.setSeconds(0, 0)
+  }
+
+  return {
+    groupInterval,
+    startDate,
+    endDate
+  }
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  buildGroupByAndBoundaries
+}
+
+// ---------------------------------------------------------------------------
+
+function buildGroupInterval (startDate: Date, endDate: Date): string {
+  const aYear = 31536000
+  const aMonth = 2678400
+  const aDay = 86400
+  const anHour = 3600
+  const aMinute = 60
+
+  const diffSeconds = (endDate.getTime() - startDate.getTime()) / 1000
+
+  if (diffSeconds >= 6 * aYear) return '6 months'
+  if (diffSeconds >= 2 * aYear) return '1 month'
+  if (diffSeconds >= 6 * aMonth) return '7 days'
+  if (diffSeconds >= 2 * aMonth) return '2 days'
+
+  if (diffSeconds >= 15 * aDay) return '1 day'
+  if (diffSeconds >= 8 * aDay) return '12 hours'
+  if (diffSeconds >= 4 * aDay) return '6 hours'
+
+  if (diffSeconds >= 15 * anHour) return '1 hour'
+
+  if (diffSeconds >= 180 * aMinute) return '10 minutes'
+
+  return '1 minute'
+}