app/frontend/tests/panel.spec.ts

import { expect, test } from "@playwright/test"
import type { PanelDef } from "../src/client"
import { api, apiPage, deleteAll } from "./utils/api"

/**
 * A panel carrying more than one dashboard draws the way between them.
 *
 * The rail is part of what the screen shows rather than chrome beside it: it
 * is inside the canvas, scaled with it, and wearing the dashboard's own look.
 * Drawn outside, it was a strip of the app's design bolted to the edge of
 * somebody's wall panel — and on a scaled canvas it did not even line up.
 *
 * It is also as tall as what it carries. Stretched end to end, a panel with
 * two dashboards showed a pill nine tenths empty.
 */

const flowName = `test_panel_${Date.now().toString(36)}`
const first = `${flowName}_a`
const second = `${flowName}_b`
/** The instance's own panels, put back by the teardown. */
let panels: PanelDef[] | null = null

test.use({ storageState: "playwright/.auth/user.json" })
test.describe.configure({ mode: "serial" })

test.beforeAll(async ({ browser }) => {
  const page = await apiPage(browser)
  await api(page, `/flows/${flowName}`, {
    method: "PUT",
    data: {
      name: flowName,
      title: "Panel",
      version: 1,
      nodes: [
        {
          id: "emit",
          type: "python",
          provides: [{ name: "level", dtype: "float" }],
        },
      ],
    },
  })
  const flow = await (await api(page, `/flows/${flowName}?draft=true`)).json()
  await api(page, `/flows/${flowName}/publish`, {
    method: "POST",
    data: { version: flow.definition.version },
  })
  await api(page, `/messages/${flowName}.level`, {
    method: "POST",
    data: { value: 4 },
  })

  for (const name of [first, second]) {
    await api(page, `/dashboards/${name}`, { method: "POST" })
    const doc = await (await api(page, `/dashboards/${name}?draft=true`)).json()
    doc.settings = { look: { value: "glass" } }
    doc.widgets = [
      {
        id: "stat",
        type: "stat",
        title: "Level",
        layout: { lg: { x: 0, y: 0, w: 3, h: 2 } },
        config: { message: `${flowName}.level`, dtype: "float" },
      },
    ]
    const put = await (
      await api(page, `/dashboards/${name}`, { method: "PUT", data: doc })
    ).json()
    await api(page, `/dashboards/${name}/publish`, {
      method: "POST",
      data: { version: put.version },
    })
  }

  // Saving is a whole-list replace, and a panel that disappears takes the
  // credential of the screen hanging on it. So append to what is there, and
  // keep the list for the teardown to put back.
  const config = await (await api(page, "/panels/")).json()
  const existing: PanelDef[] = (config.panels ?? []).filter(
    (p: PanelDef) => p.id !== flowName,
  )
  panels = existing
  await api(page, "/panels/", {
    method: "PUT",
    data: {
      panels: [
        ...existing,
        { id: flowName, title: "Hall", dashboards: [first, second] },
      ],
    },
  })
  await page.close()
})

test.afterAll(async ({ browser }) => {
  // Restoring the list is also what removes this spec's own panel.
  if (panels) {
    const page = await apiPage(browser)
    await api(page, "/panels/", { method: "PUT", data: { panels } })
    await page.close()
  }
  await deleteAll(browser, [
    `/dashboards/${first}`,
    `/dashboards/${second}`,
    `/flows/${flowName}`,
  ])
})

test("the rail is drawn on the panel, in the panel's own look", async ({
  page,
}) => {
  await page.goto(`/panel/${flowName}?d=${first}`)
  const rail = page.getByTestId("panel-rail")
  await rail.waitFor({ timeout: 20000 })

  const canvas = (await page.getByTestId("canvas-surface").boundingBox())!
  const box = (await rail.boundingBox())!
  expect(box.x, "the rail starts left of the panel").toBeGreaterThanOrEqual(
    canvas.x - 1,
  )
  expect(box.y, "the rail starts above the panel").toBeGreaterThanOrEqual(
    canvas.y - 1,
  )
  expect(
    box.x + box.width,
    "the rail runs off the right of the panel",
  ).toBeLessThanOrEqual(canvas.x + canvas.width + 1)
  expect(
    box.y + box.height,
    "the rail runs off the bottom of the panel",
  ).toBeLessThanOrEqual(canvas.y + canvas.height + 1)

  // Inside the canvas is also what makes it wear the look: the attributes and
  // the palette are stated on the canvas, and inheritance does the rest.
  const inside = await rail.evaluate(
    (el) => el.closest("[data-testid=canvas-surface]") !== null,
  )
  expect(inside, "the rail is drawn outside the panel it belongs to").toBe(true)

  // As tall as what it carries rather than as tall as the panel: a rail of
  // two stretched end to end is mostly empty pill.
  expect(
    box.height,
    "the rail is stretched to the height of the panel",
  ).toBeLessThan(canvas.height / 2)
  const centres = Math.abs(
    box.y + box.height / 2 - (canvas.y + canvas.height / 2),
  )
  expect(centres, "the rail is not centred in its column").toBeLessThan(2)

  // And the arrangement keeps clear of it rather than sitting under it.
  const tile = (await page.getByTestId("widget-frame").first().boundingBox())!
  expect(tile.x, "a widget is drawn under the rail").toBeGreaterThanOrEqual(
    box.x + box.width,
  )
})

test("the rail switches the panel between its dashboards", async ({ page }) => {
  await page.goto(`/panel/${flowName}?d=${first}`)
  await page.getByTestId(`panel-rail-${second}`).click()
  await expect(page).toHaveURL(new RegExp(`d=${second}`))
  await expect(page.getByTestId(`panel-rail-${second}`)).toHaveAttribute(
    "aria-current",
    "page",
  )
})