/** Capture the production frontend against a live, real local Rust/Gemma fixture. */
import { mkdir, writeFile } from "node:fs/promises";
import { resolve, dirname } from "node:path";
import { fileURLToPath } from "node:url";
import assert from "node:assert/strict";
import { createHash } from "node:crypto";
import { readFile } from "node:fs/promises";
import { execFileSync } from "node:child_process";
process.env.PLAYWRIGHT_BROWSERS_PATH = "0";
const { chromium } = await import("playwright");
const repository = resolve(dirname(fileURLToPath(import.meta.url)), "../..");
const target = new URL(
  process.env.SEARCHI_CAPTURE_URL ?? "http://127.0.0.1:1431/?capture=1",
);
assert(
  target.protocol === "http:" &&
    ["127.0.0.1", "localhost"].includes(target.hostname),
  "Capture must use an owned loopback server",
);
assert(
  target.searchParams.get("capture") === "1",
  "The explicit capture adapter must be enabled",
);
const out = resolve(
  repository,
  process.env.SEARCHI_CAPTURE_OUTPUT ?? "docs/screenshots",
);
const infoResponse = await fetch(new URL("/capture-info", target), {
  signal: AbortSignal.timeout(15000),
});
assert(infoResponse.ok, "Real fixture backend is not ready");
const info = await infoResponse.json();
assert(
  info.mode === "readme-capture" && info.ready === true,
  "Requires an initialized real-engine capture backend",
);
await mkdir(out, { recursive: true });
const browser = await chromium.launch({
  headless: true,
  args: [
    "--disable-gpu",
    "--disable-accelerated-video-decode",
    "--disable-webgl",
  ],
});
const failures = [];
const evidence = [];
const measured = [];
let latestMeasured;
const source = {
  base_commit: execFileSync("git", ["rev-parse", "HEAD"], {
    cwd: repository,
    encoding: "utf8",
  }).trim(),
  working_tree_dirty:
    execFileSync("git", ["status", "--porcelain"], {
      cwd: repository,
      encoding: "utf8",
    }).trim().length > 0,
};
try {
  const context = await browser.newContext({
    viewport: { width: 1440, height: 1000 },
    deviceScaleFactor: 1,
    colorScheme: "light",
    reducedMotion: "reduce",
  });
  await context.route("**/*", (route) => {
    const url = new URL(route.request().url());
    return url.origin === target.origin ||
      ["data:", "blob:"].includes(url.protocol)
      ? route.continue()
      : route.abort();
  });
  const page = await context.newPage();
  page.on("pageerror", (error) => failures.push(String(error)));
  await page.goto(target.href, { waitUntil: "networkidle", timeout: 30000 });
  await page.waitForFunction(
    () =>
      document
        .querySelector("#semantic-status")
        ?.textContent?.includes("Semantic search ready"),
    {},
    { timeout: 120000 },
  );
  await page.evaluate(async () => {
    await document.fonts.ready;
  });
  assert(
    await page
      .locator(".brand-symbol")
      .evaluate((image) => image.complete && image.naturalWidth > 0),
    "Brand asset failed to load",
  );
  async function query(text, debug = false) {
    const awaited = page.waitForResponse(
      (response) => {
        if (
          new URL(response.url()).pathname !==
          "/capture-api/hybrid_search_measured"
        )
          return false;
        const args = response.request().postDataJSON();
        return args?.query === text && Boolean(args.debugPerformance) === debug;
      },
      { timeout: 60000 },
    );
    await page.locator("#query").fill(text);
    const response = await awaited;
    assert(response.ok(), "Real measured engine query failed");
    const body = await response.json();
    assert(
      Array.isArray(body.results) && body.metrics,
      "Measured backend response missing actual results/metrics",
    );
    latestMeasured = {
      query: text,
      mode: debug ? "debug" : "basic",
      result_count: body.results.length,
      metrics: body.metrics,
      first_filename: body.results[0]?.filename,
      first_source: body.results[0]?.source,
    };
    measured.push(latestMeasured);
    await page.waitForFunction(
      (expected) => {
        const summary =
          document.querySelector("#result-summary")?.textContent ?? "";
        return (
          document.querySelector("#query")?.value === expected.query &&
          summary.includes("KEYWORD + MEANING") &&
          document.querySelector("#results .result strong")?.textContent ===
            expected.filename &&
          document.querySelectorAll("#results .result").length ===
            expected.count
        );
      },
      {
        query: text,
        filename: latestMeasured.first_filename,
        count: latestMeasured.result_count,
      },
      { timeout: 60000 },
    );
    assert(
      (await page.locator("#results .result").count()) > 0,
      `Real query returned no matches: ${text}`,
    );
    await page.locator("#results .result").first().click();
    await page.waitForFunction(
      () => !document.querySelector("#preview")?.hidden,
    );
    if (text === "cancel the supplier partnership") {
      assert.equal(
        latestMeasured.first_filename,
        "Supplier Agreement.pdf",
        "Contract query must retrieve the known PDF fixture",
      );
      assert.equal(
        latestMeasured.first_source?.kind,
        "page",
        "PDF match must retain actual page source",
      );
      assert.equal(
        latestMeasured.first_source?.number,
        2,
        "Termination clause must be on actual page2",
      );
      const passage = await page.locator("#preview-text").innerText();
      assert.match(
        passage,
        /sixty|\b60\b/i,
        "Actual PDF preview is missing notice period",
      );
      assert.match(
        passage,
        /terminat/i,
        "Actual PDF preview is missing termination section",
      );
      const literalWords = ["supplier", "partnership"];
      const rowMarks = await page
        .locator("#results .result")
        .first()
        .locator('.snippet mark[data-match="literal"]')
        .allTextContents();
      const passageMarks = await page
        .locator('#preview-text mark[data-match="literal"]')
        .allTextContents();
      for (const word of literalWords) {
        assert(
          rowMarks.some((mark) => mark.toLowerCase() === word),
          `Result snippet must highlight actual query word ${word}`,
        );
        assert(
          passageMarks.some((mark) => mark.toLowerCase() === word),
          `PDF passage must highlight actual query word ${word}`,
        );
      }
      const why = page.locator("#match-reason");
      const disclosure = why.locator("xpath=ancestor::details[1]");
      assert.equal(
        await disclosure.count(),
        1,
        "Match reason must live in a compact disclosure",
      );
      assert.equal(
        await disclosure.evaluate((element) => element.open),
        false,
        "Why details should stay collapsed by default",
      );
      await disclosure.locator(":scope > summary").click();
      await why.waitFor({ state: "visible" });
      assert.match(
        await page.locator("#match-reason").innerText(),
        /page\s*2/i,
        "Match explanation must use actual PDF page2",
      );
      await disclosure.locator(":scope > summary").click();
      assert.equal(
        await disclosure.evaluate((element) => element.open),
        false,
        "Normal screenshot must preserve collapsed why details",
      );
      latestMeasured.ui_checks = {
        literal_query_marks: true,
        actual_page_explanation: true,
        why_disclosure_collapsed_by_default: true,
      };
    }
    if (text === "mountains reflected in calm water") {
      assert.equal(
        latestMeasured.first_filename,
        "Mountain Lake.jpg",
        "Visual query must retrieve the known licensed lake",
      );
      assert.equal(
        await page.locator("#preview-text mark").count(),
        0,
        "Meaning-only photo result must not invent word-level alignment",
      );
      latestMeasured.ui_checks = { meaning_only_image_has_no_text_marks: true };
    }
    await page.evaluate(
      () =>
        new Promise((resolve) =>
          requestAnimationFrame(() => requestAnimationFrame(resolve)),
        ),
    );
  }
  async function screenshot(name, queryText) {
    assert.deepEqual(failures, [], "Frontend page errors occurred");
    const path = resolve(out, `${name}.png`);
    await page.screenshot({ path, animations: "disabled", fullPage: false });
    const selected = await page.locator("#preview-title").innerText();
    assert.equal(
      selected,
      latestMeasured.first_filename,
      "Selected DOM result is not the actual first hybrid result",
    );
    evidence.push({
      file: `${name}.png`,
      sha256: createHash("sha256")
        .update(await readFile(path))
        .digest("hex"),
      query: queryText,
      mode: latestMeasured.mode,
      result_count: latestMeasured.result_count,
      selected_filename: selected,
      first_source_kind: latestMeasured.first_source?.kind,
      first_source_number: latestMeasured.first_source?.number,
      theme: await page.evaluate(() =>
        matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light",
      ),
      summary: await page.locator("#result-summary").innerText(),
      state_assertions: {
        semantic_ready: true,
        hybrid_final: true,
        image_visible: name === "media-search",
        actual_worker_inference:
          latestMeasured.mode === "debug" &&
          latestMeasured.metrics.trace.some(
            (span) => span.counters.worker_inference_us > 0,
          ),
        ...latestMeasured.ui_checks,
      },
    });
  }
  const documentQuery = "cancel the supplier partnership";
  await query(documentQuery);
  await screenshot("search-light", documentQuery);
  await page.emulateMedia({ colorScheme: "dark" });
  await screenshot("search-dark", documentQuery);
  await page.emulateMedia({ colorScheme: "light" });
  const imageQuery = "mountains reflected in calm water";
  await query(imageQuery);
  await page.waitForFunction(
    () => {
      const image = document.querySelector("#media-preview img");
      return (
        image instanceof HTMLImageElement &&
        image.complete &&
        image.naturalWidth > 0
      );
    },
    {},
    { timeout: 60000 },
  );
  await screenshot("media-search", imageQuery);
  await page.locator("#settings > summary").click();
  await page.locator("#performance-toggle").check();
  await page.locator("#settings > summary").click();
  // Use a genuinely unseen query so this screenshot records real inference,
  // rather than attributing a bounded query-vector cache hit to the worker.
  const performanceQuery = "how can we cancel the supplier partnership";
  await query(performanceQuery, true);
  await page.locator("#performance-panel").waitFor({ state: "visible" });
  await page.locator("#performance-panel summary").click();
  await page.waitForFunction(
    () =>
      document
        .querySelector("#performance-detail")
        ?.textContent?.includes("hybrid") ||
      document
        .querySelector("#performance-detail")
        ?.textContent?.includes("Hybrid"),
  );
  assert(
    latestMeasured.metrics.trace?.some(
      (span) => span.counters.worker_inference_us > 0,
    ),
    "Detailed trace did not record real worker inference",
  );
  await page
    .locator("#performance-detail .performance-span")
    .filter({ hasText: "worker inference" })
    .first()
    .scrollIntoViewIfNeeded();
  await screenshot("performance-details", performanceQuery);
  const semanticResponse = await context.request.post(
    new URL("/capture-api/semantic_status", target).href,
    {
      headers: { "X-Searchi-Capture-Token": info.token, Origin: target.origin },
      data: {},
    },
  );
  assert(semanticResponse.ok(), "Actual semantic status unavailable");
  const semantic = await semanticResponse.json();
  assert.equal(
    semantic.worker_info?.model,
    "google/embeddinggemma-2",
    "Capture requires the actual Google model",
  );
  assert.equal(
    semantic.worker_info?.threads,
    1,
    "Capture inference requires one CPU thread",
  );
  assert.equal(
    semantic.worker_info?.device,
    "cpu",
    "Capture worker is not CPU",
  );
  await writeFile(
    resolve(out, "capture-manifest.json"),
    JSON.stringify(
      {
        kind: "browser-rendered-production-ui-real-cpu-engine",
        source,
        viewport: { width: 1440, height: 1000 },
        runner: { playwright: "1.64.0", chromium: browser.version() },
        backend: {
          mode: info.mode,
          model: semantic.worker_info.model,
          device: semantic.worker_info.device,
          runtime: semantic.worker_info.runtime,
          threads: semantic.worker_info.threads,
          dimensions: semantic.worker_info.dimensions,
          ready: info.ready,
          rust_build_profile: info.rust_build_profile,
        },
        cpu_flags: [
          "--disable-gpu",
          "--disable-accelerated-video-decode",
          "--disable-webgl",
        ],
        native_window_chrome: false,
        native_visual_qa_complete: false,
        measured_queries: measured,
        screenshots: evidence,
      },
      null,
      2,
    ) + "\n",
  );
  console.log(
    `Captured ${evidence.length} real-engine UI screenshots in ${out}`,
  );
  await context.close();
} finally {
  await browser.close();
}