Client - init distance converter

fittrackee_client/src/utils/units.ts

@@ -0,0 +1,52 @@
+import { IUnit, TFactor, TUnit } from '@/types/units'
+
+export const units: Record<string, IUnit> = {
+  ft: {
+    unit: 'ft',
+    system: 'imperial',
+    multiplier: 1,
+  },
+  mi: {
+    unit: 'mi',
+    system: 'imperial',
+    multiplier: 5280,
+  },
+  m: {
+    unit: 'm',
+    system: 'metric',
+    multiplier: 1,
+  },
+  km: {
+    unit: 'm',
+    system: 'metric',
+    multiplier: 1000,
+  },
+}
+
+const factors: TFactor = {
+  metric: {
+    imperial: 3.280839895,
+    metric: 1,
+  },
+  imperial: {
+    metric: 1 / 3.280839895,
+    imperial: 1,
+  },
+}
+
+export const convertDistance = (
+  distance: number,
+  from: TUnit,
+  to: TUnit,
+  digits: number | null = 3
+): number => {
+  const unitFrom = units[from]
+  const unitTo = units[to]
+  const convertedDistance =
+    (distance * unitFrom.multiplier * factors[unitFrom.system][unitTo.system]) /
+    unitTo.multiplier
+  if (digits !== null) {
+    return parseFloat(convertedDistance.toFixed(digits))
+  }
+  return convertedDistance
+}