refactor: move timezone functions to util file

new-lamassu-admin/src/utils/timezones.js

@@ -0,0 +1,53 @@
+import * as R from 'ramda'
+
+const getPossibleUTCDSTPairs = timezones =>
+  R.map(
+    it => ({
+      utcOffset: it.utcOffset,
+      dstOffset: it.dstOffset,
+      utcOffsetStr: it.utcOffsetStr,
+      dstOffsetStr: it.dstOffsetStr
+    }),
+    R.uniqBy(
+      it => [it.utcOffset, it.dstOffset, it.utcOffsetStr, it.dstOffsetStr],
+      timezones
+    )
+  )
+
+const finalTimezones = timezones =>
+  R.sort(
+    R.ascend(R.prop('utcOffset')),
+    R.map(
+      it => ({
+        utcOffset: it.utcOffset,
+        dstOffset: it.dstOffset,
+        utcOffsetStr: it.utcOffsetStr,
+        dstOffsetStr: it.dstOffsetStr,
+        cities: R.map(
+          ite => {
+            const regionCityPair = R.split('/', ite.name)
+            return { region: regionCityPair[0], city: regionCityPair[1] }
+          },
+          R.filter(
+            itx =>
+              R.eqProps('utcOffset', it, itx) &&
+              R.eqProps('dstOffset', it, itx) &&
+              R.includes('/', itx.name),
+            timezones
+          )
+        )
+      }),
+      getPossibleUTCDSTPairs(timezones)
+    )
+  )
+
+const buildLabel = tz => {
+  return `UTC${tz.utcOffsetStr}${
+    tz.utcOffset !== tz.dstOffset ? ' (Daylight Saving Time)' : ''
+  }`
+}
+
+const getTzLabels = timezones =>
+  R.map(it => ({ label: buildLabel(it), code: it }), finalTimezones(timezones))
+
+export { getTzLabels }