/**
 * Visual verification for the integrated local stack (root `make verify`).
 *
 * Logs into the dashboard with the bootstrap superuser and captures the app
 * shell plus the website hero in both themes. This is the standard "did the
 * change actually work" gate — look at the PNGs, do not just trust the build.
 *
 * Env (all set by the root Makefile):
 *   APP_URL, WEBSITE_URL, FIRST_SUPERUSER, FIRST_SUPERUSER_PASSWORD
 *   SCREENSHOT_DIR (default: ./screenshots)
 */
import { mkdir } from "node:fs/promises"
import { chromium } from "@playwright/test"

const APP_URL = process.env.APP_URL || "http://app.localhost"
const WEBSITE_URL = process.env.WEBSITE_URL || "http://localhost"
const EMAIL = process.env.FIRST_SUPERUSER
const PASSWORD = process.env.FIRST_SUPERUSER_PASSWORD
const OUT = process.env.SCREENSHOT_DIR || "screenshots"

if (!EMAIL || !PASSWORD) {
  console.error(
    "FIRST_SUPERUSER / FIRST_SUPERUSER_PASSWORD are unset — run from the root `make verify`.",
  )
  process.exit(1)
}

/**
 * The two shapes the app is drawn for: a desktop, and a phone. Below `md` it
 * is a different layout rather than a narrower one — see the Responsive
 * section of the root DESIGN-GUIDELINES.md — so it wants its own shots.
 */
const VIEWPORTS = [
  { name: "", viewport: { width: 1440, height: 900 } },
  { name: "mobile", viewport: { width: 390, height: 844 } },
]

/** Force the theme through the same storage key the pre-paint script reads. */
async function withTheme(browser, theme, viewport) {
  const context = await browser.newContext({
    viewport,
    colorScheme: theme,
    isMobile: viewport.width < 768,
    hasTouch: viewport.width < 768,
  })
  await context.addInitScript((t) => {
    localStorage.setItem("fluksio-ui-theme", t)
  }, theme)
  return context
}

// Chromium pins *.localhost to loopback (RFC 6761), so /etc/hosts cannot point
// it at Traefik. The containerised run (root `make verify-docker`) passes the
// mapping through here instead; empty on a host run.
const RESOLVER = process.env.HOST_RESOLVER_RULES
const browser = await chromium.launch(
  RESOLVER ? { args: [`--host-resolver-rules=${RESOLVER}`] } : {},
)

for (const theme of ["light", "dark"]) {
  for (const { name, viewport } of VIEWPORTS) {
    const dir = name ? `${OUT}/${theme}/${name}` : `${OUT}/${theme}`
    await mkdir(dir, { recursive: true })
    const context = await withTheme(browser, theme, viewport)
    const page = await context.newPage()

    await page.goto(`${WEBSITE_URL}/`, { waitUntil: "networkidle" })
    // networkidle fires before the staggered entrance animations settle, which
    // would capture buttons mid-fade and make contrast look broken.
    await page.waitForTimeout(1500)
    await page.screenshot({ path: `${dir}/website-hero.png` })

    await page.goto(`${APP_URL}/login`, { waitUntil: "networkidle" })
    await page.screenshot({ path: `${dir}/app-login.png` })

    await page.getByTestId("email-input").fill(EMAIL)
    await page.getByTestId("password-input").fill(PASSWORD)
    await page.getByRole("button", { name: /log in/i }).click()
    await page.waitForURL(`${APP_URL}/`, { timeout: 15000 })
    await page.waitForLoadState("networkidle")
    // Home's sections fetch independently, so networkidle can fall between them
    // and photograph the skeletons. The flow table is the last of them to land.
    await page
      .getByText(/activity over the last/i)
      .first()
      .waitFor({ timeout: 15000 })
    await page.waitForTimeout(1500)
    await page.screenshot({ path: `${dir}/app-dashboard.png` })

    await captureFlows(page, dir)
    await captureDashboards(page, dir)
    await captureMedia(page, dir)
    await captureRuns(page, dir)
    await captureWorkers(page, dir)

    await context.close()
    console.log(
      `  wrote ${dir}/{website-hero,app-login,app-dashboard,app-flows,app-flow-panel,app-panel,app-runs,app-run,app-run-context,app-workers}.png`,
    )
  }
}

await browser.close()

/**
 * The experiment log: the table, one run in full, and a dashboard read against
 * the runs someone picked. Skipped on an instance that has never run anything,
 * where all three would photograph the same empty state.
 */
async function captureRuns(page, dir) {
  await page.goto(`${APP_URL}/runs`, { waitUntil: "networkidle" })
  await page.waitForTimeout(1000)
  await page.screenshot({ path: `${dir}/app-runs.png` })

  const rows = page.getByTestId("run-row")
  if (!(await rows.count())) return

  // Two runs compared, which is the whole point of the screen.
  const boxes = page.getByTestId("run-select")
  await boxes.nth(0).click()
  if ((await boxes.count()) > 1) await boxes.nth(1).click()
  await page.waitForTimeout(1500)
  await page.screenshot({ path: `${dir}/app-runs-compare.png`, fullPage: true })

  // A dashboard read against those two runs: the same page a live run is
  // watched on, showing finished ones. This is the seam the feature exists for.
  const picked = await page
    .getByTestId("run-link")
    .evaluateAll((links) =>
      links.slice(0, 2).map((a) => a.getAttribute("href")),
    )
  const ids = picked
    .map((href) => (href || "").split("/").pop())
    .filter(Boolean)
  // The API is its own host here; the SPA's origin does not proxy /api.
  const apiUrl = APP_URL.replace("//app.", "//api.")
  const results = await page.evaluate(async (base) => {
    const answer = await fetch(`${base}/api/v1/dashboards/`, {
      headers: {
        Authorization: `Bearer ${localStorage.getItem("access_token")}`,
      },
    })
    if (!answer.ok) return null
    const body = await answer.json()
    return (body.data || [])
      .map((one) => one.name)
      .find((n) => n.endsWith("_results"))
  }, apiUrl)
  if (results && ids.length) {
    await page.goto(`${APP_URL}/view/${results}?runs=${ids.join(",")}`, {
      waitUntil: "networkidle",
    })
    await page.waitForTimeout(2000)
    await page.screenshot({ path: `${dir}/app-run-context.png` })
  }

  // The dashboard that pins the last few runs, drawn live rather than in a
  // context: the other half of the same idea.
  await page.goto(`${APP_URL}/view/demo_training`, { waitUntil: "networkidle" })
  await page.waitForTimeout(2500)
  await page.screenshot({ path: `${dir}/app-runs-pinned.png` })

  await page.goto(`${APP_URL}/runs`, { waitUntil: "networkidle" })
  await page.getByTestId("run-link").first().click()
  await page.waitForURL(/\/runs\/.+/, { timeout: 15000 })
  await page.waitForLoadState("networkidle")
  await page.waitForTimeout(1500)
  await page.screenshot({ path: `${dir}/app-run.png`, fullPage: true })
}

/**
 * A dashboard as a wall panel sees it. Seeds one if the instance has none, so
 * the shot shows the grid rather than an empty-state message.
 */
async function captureDashboards(page, dir) {
  await page.goto(`${APP_URL}/dashboards`, { waitUntil: "networkidle" })

  if (!(await page.getByTestId("dashboard-card").count())) {
    await page.getByTestId("new-dashboard").click()
    await page.getByTestId("new-dashboard-name").fill("panel")
    await page.getByTestId("create-dashboard").click()
    await page.waitForURL(/\/dashboards\/.+/, { timeout: 15000 })
    // A widget, so the grid has something in it worth photographing.
    await page.getByTestId("add-widget").click()
    await page.getByTestId("add-widget-stat").click()
    await page.waitForSelector("[data-testid=widget-settings]")
    await page.getByTestId("toggle-edit").click()
  } else {
    await page.getByTestId("dashboard-card").first().click()
    await page.waitForURL(/\/dashboards\/.+/, { timeout: 15000 })
  }

  await page.waitForTimeout(1500)
  await page.screenshot({ path: `${dir}/app-panel.png` })
}

/**
 * A media tile drawing what a camera published, where there is one.
 *
 * Skipped unless the media example is seeded (root `make seed-example-media`),
 * since it is the one shot that needs a source of frames. The bytes arrive as
 * a blob — pushed down the socket, or fetched with the session's credential,
 * which no `img` could carry on its own — so a `blob:` source is the proof the
 * whole path ran rather than that a picture is merely present.
 *
 * The one page that cannot wait for `networkidle`: a camera publishing several
 * frames a second is a socket that never goes quiet, which is the point of it.
 * The blob source below is a stronger wait anyway — it says a frame arrived,
 * where idleness only ever said the page stopped asking.
 */
async function captureMedia(page, dir) {
  const answer = await page.goto(`${APP_URL}/view/camera`, {
    waitUntil: "domcontentloaded",
  })
  if (!answer?.ok()) return

  const picture = page.locator("img[alt='Test camera']")
  try {
    await picture.waitFor({ timeout: 15000 })
    await page.waitForFunction(
      () =>
        document
          .querySelector("img[alt='Test camera']")
          ?.src?.startsWith("blob:") ?? false,
      { timeout: 15000 },
    )
  } catch {
    console.warn(
      "  media tile drew nothing — is `make seed-example-media` run?",
    )
    return
  }
  await page.waitForTimeout(500)
  await page.screenshot({ path: `${dir}/app-media.png` })
}

/**
 * The flow editor, empty-handed if the instance has no flows yet: seeds one
 * with a node so the canvas and the node panel are both worth looking at.
 */
/** Every machine a node can run on, and the sizes it can ask for. */
async function captureWorkers(page, dir) {
  await page.goto(`${APP_URL}/workers`, { waitUntil: "networkidle" })
  await page.getByText(/^Sizes$/).waitFor({ timeout: 15000 })
  await page.waitForTimeout(500)
  await page.screenshot({ path: `${dir}/app-workers.png`, fullPage: true })
}

async function captureFlows(page, dir) {
  await page.goto(`${APP_URL}/flows`, { waitUntil: "networkidle" })

  if (await page.getByTestId("flow-card").count()) {
    await page.getByTestId("flow-card").first().click()
  } else {
    await page.getByTestId("new-flow").click()
    await page.getByTestId("new-flow-name").fill("first_flow")
    await page.getByTestId("create-flow").click()
  }
  await page.waitForURL(/\/flows\/.+/, { timeout: 15000 })
  // The canvas paints before the flow detail arrives, so counting nodes right
  // away reads 0 for a populated flow — and the seeding below would then add a
  // node to somebody's real flow. Wait until it says which of the two it is.
  await page
    .locator(".react-flow__node, [data-testid=flow-empty]")
    .first()
    .waitFor({ timeout: 15000 })

  if (!(await page.locator(".react-flow__node").count())) {
    await page.getByTestId("add-node").click()
    await page
      .getByRole("option", { name: /function/i })
      .first()
      .click()
    await page.waitForSelector(".react-flow__node")
  }

  // Adding a node opens its panel; the canvas shot wants it out of the way.
  await page.keyboard.press("Escape")
  // The dock and the title bar slide in; let them land before the shutter.
  await page.waitForTimeout(1200)
  await page.screenshot({ path: `${dir}/app-flows.png` })

  await page.locator(".react-flow__node").first().click()
  await page.waitForSelector("[data-testid=node-panel], .monaco-editor", {
    timeout: 15000,
  })
  await page.waitForTimeout(1500)
  await page.screenshot({ path: `${dir}/app-flow-panel.png` })
}