/**
 * Regression guard for the age-4 savable/expiring arithmetic actually
 * reaching the Dashboard UI.
 *
 * Domain rule (see AGENTS.md "Domain rules" and
 * backend/app/config.py's `LeaveRules`): after the child turns 4, only 96
 * days may be saved *per child* — for a `couple` workspace with two
 * parents, that's a 48-day cap *per parent*, not 96 each. A prior bug
 * modelled a two-parent family as able to save 192 days combined by
 * applying the per-child cap to each parent independently — see
 * `AnalyticsService`'s module docstring, which documents this exact
 * failure mode. This test asserts the invariant holds in the API response
 * AND that the Dashboard renders those same numbers (not some other,
 * separately-computed figure) — the historically-buggy progress bar was a
 * *wiring* defect, not a backend one.
 */
import { test, expect } from '@playwright/test'
import { apiGetOverview, apiLogin, DEMO_EMAIL, DEMO_PASSWORD } from '../support/api'
import { loadSeedFixture } from '../support/fixture'

test('per-parent expiring/savable figures respect the 48/96 age-4 cap, and the Dashboard shows the same numbers', async ({
  page,
}) => {
  const fixture = loadSeedFixture()
  const token = await apiLogin(DEMO_EMAIL, DEMO_PASSWORD)
  const overview = await apiGetOverview(token, fixture.workspaceId, fixture.childId)

  // Ground truth from the API, independent of anything rendered.
  expect(overview.parent_projections.length).toBe(2) // seed_demo.py: Alex + Sam
  for (const projection of overview.parent_projections) {
    expect(projection.savable_after_b4).toBeLessThanOrEqual(projection.savable_cap_at_b4)
    expect(projection.savable_after_b4).toBeGreaterThanOrEqual(0)
    expect(projection.expiring_at_b4).toBeGreaterThanOrEqual(0)
  }
  // The literal regression this guards: a two-parent workspace's per-parent
  // caps must sum to the per-CHILD ceiling (96), never double it (192).
  const capSum = overview.parent_projections.reduce((sum, p) => sum + p.savable_cap_at_b4, 0)
  expect(capSum).toBeLessThanOrEqual(96)
  const savableSum = overview.parent_projections.reduce((sum, p) => sum + p.savable_after_b4, 0)
  expect(savableSum).toBeLessThanOrEqual(96)

  // Now confirm the Dashboard actually surfaces these same figures.
  await page.goto('/')
  await expect(page.getByTestId('dashboard')).toBeVisible()

  for (const projection of overview.parent_projections) {
    const metric = page.getByTestId(`metric-expiring-parent-${projection.personal_data_uuid}`)
    await expect(metric).toBeVisible()
    const value = metric.locator('[data-testid^="metric-value-"]')
    await expect(value).toHaveText(String(projection.expiring_at_b4))
  }

  const combinedMetric = page.getByTestId('metric-expiring-combined')
  await expect(combinedMetric).toBeVisible()
  const combinedValue = combinedMetric.locator('[data-testid^="metric-value-"]')
  await expect(combinedValue).toHaveText(String(overview.combined_expiring_at_b4))
})