Calculate payday correctly

lib/utils/payday.test.ts

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+import { getPayday, countDaysBeforePayday, countDaysAfterPayday, countDaysAfterBlock } from './payday';
+import { WorkspaceDBScheme } from '@hawk.so/types';
+import { ObjectId } from 'mongodb';
+
+/**
+ * Mock the Date constructor to allow controlling "now"
+ */
+let mockedNow: number | null = null;
+
+const setMockedNow = (date: Date): void => {
+  mockedNow = date.getTime();
+};
+
+const resetMockedNow = (): void => {
+  mockedNow = null;
+};
+
+// Override Date constructor
+const RealDate = Date;
+global.Date = class extends RealDate {
+  /**
+   * Constructor for mocked Date class
+   * @param args - arguments passed to Date constructor
+   */
+  constructor(...args: unknown[]) {
+    if (args.length === 0 && mockedNow !== null) {
+      super(mockedNow);
+    } else {
+      super(...(args as []));
+    }
+  }
+
+  public static now(): number {
+    return mockedNow !== null ? mockedNow : RealDate.now();
+  }
+} as DateConstructor;
+
+describe('Payday utility functions', () => {
+  afterEach(() => {
+    resetMockedNow();
+  });
+
+  describe('getPayday', () => {
+    it('should return paidUntil date when provided', () => {
+      const lastChargeDate = new Date('2025-11-01');
+      const paidUntil = new Date('2025-12-15');
+
+      const result = getPayday(lastChargeDate, paidUntil);
+
+      expect(result).toEqual(paidUntil);
+    });
+
+    it('should calculate payday as one month after lastChargeDate when paidUntil is not provided', () => {
+      const lastChargeDate = new Date('2025-11-01');
+
+      const result = getPayday(lastChargeDate);
+
+      expect(result.getFullYear()).toBe(2025);
+      expect(result.getMonth()).toBe(11); // December (0-indexed)
+      expect(result.getDate()).toBe(1);
+    });
+
+    it('should handle year transition correctly', () => {
+      const lastChargeDate = new Date('2025-12-15');
+
+      const result = getPayday(lastChargeDate);
+
+      expect(result.getFullYear()).toBe(2026);
+      expect(result.getMonth()).toBe(0); // January (0-indexed)
+      expect(result.getDate()).toBe(15);
+    });
+
+    it('should add one day when isDebug is true', () => {
+      const lastChargeDate = new Date('2025-12-01');
+
+      const result = getPayday(lastChargeDate, null, true);
+
+      expect(result.getFullYear()).toBe(2025);
+      expect(result.getMonth()).toBe(11); // December (0-indexed)
+      expect(result.getDate()).toBe(2);
+    });
+
+    it('should prioritize paidUntil over debug mode', () => {
+      const lastChargeDate = new Date('2025-11-01');
+      const paidUntil = new Date('2025-12-15');
+
+      const result = getPayday(lastChargeDate, paidUntil, true);
+
+      expect(result).toEqual(paidUntil);
+    });
+
+    it('should handle end of month dates correctly', () => {
+      const lastChargeDate = new Date('2025-01-31');
+
+      const result = getPayday(lastChargeDate);
+
+      // JavaScript will adjust to the last day of February
+      expect(result.getFullYear()).toBe(2025);
+      expect(result.getMonth()).toBe(2); // March (0-indexed)
+      expect(result.getDate()).toBe(3); // Adjusted from Feb 31 to Mar 3
+    });
+  });
+
+  describe('countDaysBeforePayday', () => {
+    it('should return positive days when payday is in the future', () => {
+      const now = new Date('2025-12-01');
+      const lastChargeDate = new Date('2025-11-20');
+
+      setMockedNow(now);
+
+      const result = countDaysBeforePayday(lastChargeDate);
+
+      expect(result).toBe(19); // Dec 20 - Dec 1 = 19 days
+    });
+
+    it('should return 0 when payday is today', () => {
+      // Payday is calculated as one month after lastChargeDate, so Dec 20 12pm
+      const now = new Date('2025-12-20T12:00:00.000Z');
+      const lastChargeDate = new Date('2025-11-20T12:00:00.000Z');
+
+      setMockedNow(now);
+
+      const result = countDaysBeforePayday(lastChargeDate);
+
+      expect(result).toBe(0);
+    });
+
+    it('should return negative days when payday has passed', () => {
+      const now = new Date('2025-12-25');
+      const lastChargeDate = new Date('2025-11-20');
+
+      setMockedNow(now);
+
+      const result = countDaysBeforePayday(lastChargeDate);
+
+      expect(result).toBe(-5); // Dec 20 - Dec 25 = -5 days
+    });
+
+    it('should use paidUntil when provided', () => {
+      const now = new Date('2025-12-01');
+      const lastChargeDate = new Date('2025-10-01');
+      const paidUntil = new Date('2025-12-15');
+
+      setMockedNow(now);
+
+      const result = countDaysBeforePayday(lastChargeDate, paidUntil);
+
+      expect(result).toBe(14); // Dec 15 - Dec 1 = 14 days
+    });
+
+    it('should work correctly in debug mode', () => {
+      const now = new Date('2025-12-01T00:00:00Z');
+      const lastChargeDate = new Date('2025-11-30T00:00:00Z');
+
+      setMockedNow(now);
+
+      const result = countDaysBeforePayday(lastChargeDate, null, true);
+
+      expect(result).toBe(0); // Next day is Dec 1, same as now
+    });
+
+    it('should handle cross-year payday correctly', () => {
+      const now = new Date('2025-12-20');
+      const lastChargeDate = new Date('2025-12-15');
+
+      setMockedNow(now);
+
+      const result = countDaysBeforePayday(lastChargeDate);
+
+      expect(result).toBe(26); // Jan 15, 2026 - Dec 20, 2025 = 26 days
+    });
+  });
+
+  describe('countDaysAfterPayday', () => {
+    it('should return 0 when payday is today', () => {
+      const now = new Date('2025-12-20T12:00:00Z');
+      const lastChargeDate = new Date('2025-11-20T00:00:00Z');
+
+      setMockedNow(now);
+
+      const result = countDaysAfterPayday(lastChargeDate);
+
+      expect(result).toBe(0);
+    });
+
+    it('should return positive days when payday has passed', () => {
+      const now = new Date('2025-12-25');
+      const lastChargeDate = new Date('2025-11-20');
+
+      setMockedNow(now);
+
+      const result = countDaysAfterPayday(lastChargeDate);
+
+      expect(result).toBe(5); // Dec 25 - Dec 20 = 5 days
+    });
+
+    it('should return negative days when payday is in the future', () => {
+      const now = new Date('2025-12-01');
+      const lastChargeDate = new Date('2025-11-20');
+
+      setMockedNow(now);
+
+      const result = countDaysAfterPayday(lastChargeDate);
+
+      expect(result).toBe(-19); // Dec 1 - Dec 20 = -19 days
+    });
+
+    it('should use paidUntil when provided', () => {
+      const now = new Date('2025-12-20');
+      const lastChargeDate = new Date('2025-10-01');
+      const paidUntil = new Date('2025-12-15');
+
+      setMockedNow(now);
+
+      const result = countDaysAfterPayday(lastChargeDate, paidUntil);
+
+      expect(result).toBe(5); // Dec 20 - Dec 15 = 5 days
+    });
+
+    it('should work correctly in debug mode', () => {
+      const now = new Date('2025-12-03T00:00:00Z');
+      const lastChargeDate = new Date('2025-12-01T00:00:00Z');
+
+      setMockedNow(now);
+
+      const result = countDaysAfterPayday(lastChargeDate, null, true);
+
+      expect(result).toBe(1); // Dec 3 - Dec 2 = 1 day
+    });
+
+    it('should be the inverse of countDaysBeforePayday', () => {
+      const now = new Date('2025-12-15');
+      const lastChargeDate = new Date('2025-11-20');
+
+      setMockedNow(now);
+
+      const daysBefore = countDaysBeforePayday(lastChargeDate);
+      const daysAfter = countDaysAfterPayday(lastChargeDate);
+
+      expect(daysBefore).toBe(-daysAfter);
+    });
+  });
+
+  describe('countDaysAfterBlock', () => {
+    it('should return undefined when blockedDate is not set', () => {
+      const workspace: WorkspaceDBScheme = {
+        _id: new ObjectId(),
+        name: 'Test Workspace',
+        inviteHash: 'test-hash',
+        tariffPlanId: new ObjectId(),
+        billingPeriodEventsCount: 0,
+        lastChargeDate: new Date(),
+        accountId: 'test-account',
+        balance: 0,
+        blockedDate: null,
+      };
+
+      const result = countDaysAfterBlock(workspace);
+
+      expect(result).toBeUndefined();
+    });
+
+    it('should return 0 when workspace was blocked today', () => {
+      const now = new Date('2025-12-18T12:00:00Z');
+      const blockedDate = new Date('2025-12-18T00:00:00Z');
+
+      setMockedNow(now);
+
+      const workspace: WorkspaceDBScheme = {
+        _id: new ObjectId(),
+        name: 'Test Workspace',
+        inviteHash: 'test-hash',
+        tariffPlanId: new ObjectId(),
+        billingPeriodEventsCount: 0,
+        lastChargeDate: new Date(),
+        accountId: 'test-account',
+        balance: 0,
+        blockedDate,
+      };
+
+      const result = countDaysAfterBlock(workspace);
+
+      expect(result).toBe(0);
+    });
+
+    it('should return correct number of days after block', () => {
+      const now = new Date('2025-12-18');
+      const blockedDate = new Date('2025-12-10');
+
+      setMockedNow(now);
+
+      const workspace: WorkspaceDBScheme = {
+        _id: new ObjectId(),
+        name: 'Test Workspace',
+        inviteHash: 'test-hash',
+        tariffPlanId: new ObjectId(),
+        billingPeriodEventsCount: 0,
+        lastChargeDate: new Date(),
+        accountId: 'test-account',
+        balance: 0,
+        blockedDate,
+      };
+
+      const result = countDaysAfterBlock(workspace);
+
+      expect(result).toBe(8); // Dec 18 - Dec 10 = 8 days
+    });
+
+    it('should handle cross-month blocks correctly', () => {
+      const now = new Date('2025-12-05');
+      const blockedDate = new Date('2025-11-28');
+
+      setMockedNow(now);
+
+      const workspace: WorkspaceDBScheme = {
+        _id: new ObjectId(),
+        name: 'Test Workspace',
+        inviteHash: 'test-hash',
+        tariffPlanId: new ObjectId(),
+        billingPeriodEventsCount: 0,
+        lastChargeDate: new Date(),
+        accountId: 'test-account',
+        balance: 0,
+        blockedDate,
+      };
+
+      const result = countDaysAfterBlock(workspace);
+
+      expect(result).toBe(7); // Dec 5 - Nov 28 = 7 days
+    });
+
+    it('should handle cross-year blocks correctly', () => {
+      const now = new Date('2026-01-05');
+      const blockedDate = new Date('2025-12-28');
+
+      setMockedNow(now);
+
+      const workspace: WorkspaceDBScheme = {
+        _id: new ObjectId(),
+        name: 'Test Workspace',
+        inviteHash: 'test-hash',
+        tariffPlanId: new ObjectId(),
+        billingPeriodEventsCount: 0,
+        lastChargeDate: new Date(),
+        accountId: 'test-account',
+        balance: 0,
+        blockedDate,
+      };
+
+      const result = countDaysAfterBlock(workspace);
+
+      expect(result).toBe(8); // Jan 5, 2026 - Dec 28, 2025 = 8 days
+    });
+  });
+});