import { expect, test } from "@playwright/test";
import fs from "node:fs/promises";
import path from "node:path";
import { previewDocumentHtml } from "../src/cvPreview";

const original = path.resolve("../docs/redesign/phase-5/p5-09-readiness/evidence/fidelity");

test("[PRES-C09 C12] original flowing/boundary fixtures retain native PDF page membership", async ({ page }) => {
  const baseline = JSON.parse(await fs.readFile(path.join(original, "fidelity-results.json"), "utf8"));
  for (const fixture of baseline.fixtures.filter((fixture: { pass: boolean }) => !fixture.pass)) {
    await page.setContent(previewDocumentHtml(await fs.readFile(path.join(original, fixture.fixture, "render.html"), "utf8"), 1122.52));
    await expect.poll(() => page.evaluate(() => document.documentElement.dataset.cvPreviewReady)).toBe("true");
    expect(await page.evaluate(() => Number(document.documentElement.dataset.cvPreviewPages)), fixture.fixture).toBe(fixture.pdfPages);
    const membership = await page.evaluate(() => {
      const width = Number(document.documentElement.dataset.cvPreviewWidth);
      const walker = document.createTreeWalker(document.querySelector(".page")!, NodeFilter.SHOW_TEXT);
      const markers: { token: string; page: number }[] = [];
      let node;
      while ((node = walker.nextNode())) for (const match of (node.textContent || "").matchAll(/\b[SEBPR]\d{2}\b/g)) {
        const range = document.createRange();
        range.setStart(node, match.index!); range.setEnd(node, match.index! + match[0].length);
        markers.push({ token: match[0], page: Math.floor(range.getClientRects()[0].x / width) + 1 });
      }
      return markers;
    });
    expect(membership, fixture.fixture).toEqual(fixture.comparisons.map((marker: { token: string; pdfPage: number }) => ({ token: marker.token, page: marker.pdfPage })));
    expect(await page.evaluate(() => document.body.innerText)).not.toContain("HIDDEN-MARKER");
  }
});

test("[PRES-C06 C09] pagination waits for image layout and publishes one settled measurement", async ({ page }) => {
  let releaseImage!: () => void;
  const gate = new Promise<void>(resolve => { releaseImage = resolve; });
  await page.route("**/pagination-photo.svg", async route => {
    await gate;
    await route.fulfill({ contentType: "image/svg+xml", body: '<svg xmlns="http://www.w3.org/2000/svg" width="200" height="100"><rect width="200" height="100" fill="navy"/></svg>' });
  });
  const html = '<html><head><style>:root{--cv-page-margin:16mm}body{margin:0}.page{width:210mm;min-height:297mm}@media print{.page{width:auto;min-height:0}}</style></head><body><div class="page"><img alt="Synthetic fixture" src="http://localhost:3300/pagination-photo.svg" style="width:20mm"></div></body></html>';
  await page.setContent(previewDocumentHtml(html, 1122.52), { waitUntil: "domcontentloaded" });
  expect(await page.evaluate(() => document.documentElement.dataset.cvPreviewReady)).toBeUndefined();
  await page.evaluate(() => {
    document.documentElement.dataset.readyEvents = "0";
    window.addEventListener("cv-preview-ready", () => { document.documentElement.dataset.readyEvents = String(Number(document.documentElement.dataset.readyEvents) + 1); });
  });
  releaseImage();
  await expect.poll(() => page.evaluate(() => document.documentElement.dataset.cvPreviewReady)).toBe("true");
  expect(await page.evaluate(() => ({ events: document.documentElement.dataset.readyEvents, pages: document.documentElement.dataset.cvPreviewPages }))).toEqual({ events: "1", pages: "1" });
  expect(await page.evaluate(() => document.querySelector("img")!.getBoundingClientRect().height)).toBeCloseTo(10 * 96 / 25.4, 1);
  await page.evaluate(() => new Promise<void>(resolve => requestAnimationFrame(() => requestAnimationFrame(() => resolve()))));
  expect(await page.evaluate(() => document.documentElement.dataset.readyEvents)).toBe("1");
});

for (const fixture of [{ name: "default-modern", pages: 1 }, { name: "long-en-minimal", pages: 4 }]) {
  test(`[PRES-C06 C09] initially hidden ${fixture.name} preview waits for physical layout`, async ({ page }, info) => {
    const html = await fs.readFile(path.join(original, fixture.name, "render.html"), "utf8");
    await page.setContent('<div id="preview-pane" style="display:none"><iframe title="Fixture CV" style="width:210mm;height:297mm;border:0"></iframe></div>');
    await page.locator("iframe").evaluate((frame, documentHtml) => { (frame as HTMLIFrameElement).srcdoc = documentHtml; }, previewDocumentHtml(html, 1122.52));
    const documentPage = page.frameLocator("iframe").locator(".page");
    await expect(documentPage).toBeAttached();
    const before = await documentPage.evaluate(async () => {
      await document.fonts.ready;
      await new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));
      document.documentElement.dataset.readyEvents = "0";
      window.addEventListener("cv-preview-ready", () => { document.documentElement.dataset.readyEvents = String(Number(document.documentElement.dataset.readyEvents) + 1); });
      return { width: document.querySelector(".page")!.getBoundingClientRect().width, ready: document.documentElement.dataset.cvPreviewReady };
    });
    expect(before.width).toBe(0);
    expect(before.ready, "a hidden document must not publish a settled zero-width layout").toBeUndefined();
    await page.locator("#preview-pane").evaluate(element => { (element as HTMLElement).style.display = "block"; });
    await expect.poll(() => documentPage.evaluate(() => document.documentElement.dataset.cvPreviewReady)).toBe("true");
    const after = await documentPage.evaluate(() => ({
      width: Number(document.documentElement.dataset.cvPreviewWidth),
      flowWidth: document.querySelector("[data-cv-preview-flow]")!.getBoundingClientRect().width,
      pages: Number(document.documentElement.dataset.cvPreviewPages),
      events: document.documentElement.dataset.readyEvents,
      durationMs: Number(document.documentElement.dataset.cvPreviewDurationMs),
    }));
    expect(after.width).toBeCloseTo(210 * 96 / 25.4, 1);
    expect(after.flowWidth).toBeCloseTo(210 * 96 / 25.4, 1);
    expect(after.pages).toBe(fixture.pages);
    expect(after.events).toBe("1");
    await page.locator("#preview-pane").evaluate(element => { (element as HTMLElement).style.display = "none"; });
    await page.setViewportSize({ width: 844, height: 390 });
    await page.locator("#preview-pane").evaluate(element => { (element as HTMLElement).style.display = "block"; element.querySelector("iframe")!.style.transform = "scale(.45)"; });
    await documentPage.evaluate(() => new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve))));
    expect(await documentPage.evaluate(() => ({ width: Number(document.documentElement.dataset.cvPreviewWidth), pages: Number(document.documentElement.dataset.cvPreviewPages), events: document.documentElement.dataset.readyEvents })))
      .toEqual({ width: after.width, pages: fixture.pages, events: "1" });
    await info.attach("initially-hidden-preview", { body: JSON.stringify({ fixture: fixture.name, before, after }), contentType: "application/json" });
  });
}