import { describe, expect, it } from 'vitest';

import { isReminderDue } from '@/lib/services/document-reminders';

const now = new Date('2026-04-28T12:00:00Z');

function args(overrides: Partial<Parameters<typeof isReminderDue>[0]> = {}) {
  return {
    status: 'sent' as const,
    documensoId: 'doc-1',
    remindersDisabled: false,
    reminderCadenceOverride: null,
    templateCadenceDays: 7,
    lastReminderAt: null,
    now,
    ...overrides,
  };
}

describe('isReminderDue', () => {
  it('returns true when no prior reminder exists and cadence is set', () => {
    expect(isReminderDue(args())).toBe(true);
  });

  it('returns false when document is completed', () => {
    expect(isReminderDue(args({ status: 'completed' }))).toBe(false);
  });

  it('returns false when document has no Documenso id', () => {
    expect(isReminderDue(args({ documensoId: null }))).toBe(false);
  });

  it('returns false when reminders are disabled per-doc', () => {
    expect(isReminderDue(args({ remindersDisabled: true }))).toBe(false);
  });

  it('returns false when neither override nor template cadence is set', () => {
    expect(isReminderDue(args({ templateCadenceDays: null }))).toBe(false);
  });

  it('respects per-doc override over template default', () => {
    // 1-day override, last fired 12h ago → not due
    const lastReminderAt = new Date(now.getTime() - 12 * 60 * 60 * 1000);
    expect(
      isReminderDue(args({ templateCadenceDays: 7, reminderCadenceOverride: 1, lastReminderAt })),
    ).toBe(false);

    // 1-day override, last fired 25h ago → due
    const earlier = new Date(now.getTime() - 25 * 60 * 60 * 1000);
    expect(
      isReminderDue(
        args({
          templateCadenceDays: 7,
          reminderCadenceOverride: 1,
          lastReminderAt: earlier,
        }),
      ),
    ).toBe(true);
  });

  it('treats template cadence as the fallback when no override', () => {
    // 7-day template, last fired 6 days ago → not due
    const lastReminderAt = new Date(now.getTime() - 6 * 24 * 60 * 60 * 1000);
    expect(isReminderDue(args({ lastReminderAt }))).toBe(false);

    // 7 days exactly → due
    const sevenDays = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000);
    expect(isReminderDue(args({ lastReminderAt: sevenDays }))).toBe(true);
  });
});