import { afterEach, describe, expect, it, vi } from 'vitest';
import {
  formatDistanceLabel,
  getPresenceStatus,
  isDiscoverGridItem,
  profileAgeFromBirthDate,
  readDiscoverGridItems,
} from './discover-profile-formatters';

describe('profileAgeFromBirthDate', () => {
  it('returns null for empty or invalid dates', () => {
    expect(profileAgeFromBirthDate(null)).toBeNull();
    expect(profileAgeFromBirthDate('not-a-date')).toBeNull();
  });

  it('computes age from ISO birth date', () => {
    expect(profileAgeFromBirthDate('2000-01-01')).toBeGreaterThanOrEqual(25);
  });
});

describe('formatDistanceLabel', () => {
  it('formats metric distances', () => {
    expect(formatDistanceLabel(500)).toBe('500 m');
    expect(formatDistanceLabel(1500)).toBe('1.5 km');
    expect(formatDistanceLabel(15000)).toBe('15 km');
  });

  it('formats imperial distances', () => {
    expect(formatDistanceLabel(10, 'imperial')).toMatch(/ft$/);
    expect(formatDistanceLabel(2000, 'imperial')).toMatch(/mi$/);
  });
});

describe('getPresenceStatus', () => {
  afterEach(() => {
    vi.useRealTimers();
  });

  it('classifies lastSeen windows', () => {
    vi.useFakeTimers();
    vi.setSystemTime(new Date('2026-01-01T12:00:00Z'));
    expect(getPresenceStatus(null)).toBe('offline');
    expect(getPresenceStatus('not-a-date')).toBe('offline');
    expect(getPresenceStatus('2026-01-01T11:58:00Z')).toBe('online');
    expect(getPresenceStatus('2026-01-01T06:00:00Z')).toBe('recent');
    expect(getPresenceStatus('2025-12-01T12:00:00Z')).toBe('offline');
  });
});

describe('discover grid helpers', () => {
  it('type-guards and reads nested grid items', () => {
    expect(isDiscoverGridItem(null)).toBe(false);
    expect(isDiscoverGridItem({ kind: 'profile' })).toBe(true);
    expect(isDiscoverGridItem({ kind: 'ad' })).toBe(true);
    expect(isDiscoverGridItem({ kind: 'other' })).toBe(false);

    const data = {
      discover: {
        items: [
          { kind: 'profile', id: 'p1', person: { id: 'p1' } },
          { kind: 'ad', id: 'a1' },
          { kind: 'nope' },
          null,
        ],
      },
    };
    expect(readDiscoverGridItems(data, 'discover.items')).toHaveLength(2);
    expect(readDiscoverGridItems(data, 'discover.missing')).toEqual([]);
    expect(readDiscoverGridItems({}, 'a.b')).toEqual([]);

    vi.useFakeTimers();
    vi.setSystemTime(new Date('2026-06-15T00:00:00Z'));
    expect(profileAgeFromBirthDate('2000-07-01')).toBe(25);
    expect(profileAgeFromBirthDate('2000-06-15')).toBe(26);
    expect(profileAgeFromBirthDate('2099-01-01')).toBeNull();
    vi.useRealTimers();
  });
});