add validation for seasons payments

process/payments/validation.ts

@@ -2,7 +2,8 @@
 /* eslint-disable no-case-declarations */
 import { counting, max, min, sort } from 'radash/dist/array';
 import type RootStore from 'stores/root';
-import { areEqual } from 'tools/array';
+import { areEqual, isSorted, shift } from 'tools/array';
+import { SEASONS_PERIODS, SEASONS_PERIOD_NUMBER } from './lib/seasons-constants';
 
 export default function validatePaymentsTable({ $calculation, $tables }: RootStore) {
   switch ($calculation.getElementValue('radioGraphType')) {
@@ -92,12 +93,23 @@ export default function validatePaymentsTable({ $calculation, $tables }: RootSto
         return 'Не выбран тип сезонности';
       }
 
-      const highSeasonStart = $calculation.getElementValue('selectHighSeasonStart');
-      if (!highSeasonStart) {
+      const highSeasonStartOption = $calculation.getElementOption('selectHighSeasonStart');
+      if (!highSeasonStartOption) {
         return 'Не выбрано смещение сезонности';
       }
 
-      // TODO: seasons validation
+      {
+        const seasons = $tables.payments.values.slice(1, SEASONS_PERIOD_NUMBER + 1);
+        const shiftNumber = Number.parseInt(highSeasonStartOption.label, 10) - 2;
+        const unshiftedSeasons = shift(seasons, -shiftNumber);
+
+        const positions = SEASONS_PERIODS[seasonType];
+        const seasonsValues = positions.map((position) => unshiftedSeasons[position]);
+
+        if (isSorted(seasonsValues)) {
+          return 'Сезонные платежи должны убывать';
+        }
+      }
 
       break;
     }

tools/array.ts

@@ -25,3 +25,7 @@ export function shift<T>(arr: Array<T>, n: number) {
 
   return [...arr.slice(-shiftNumber, arr.length), ...arr.slice(0, -shiftNumber)];
 }
+
+export function isSorted(arr: Array<number>) {
+  return arr.every((value, index, array) => !index || array[index - 1] <= value);
+}