import { existsSync, readFileSync } from "node:fs";
import { resolve } from "node:path";
import { createServer, type ViteDevServer } from "vite";
import type { Page } from "@playwright/test";
import { clickNavigationLink, expect, test } from "../helpers/serve-dist";

const textSpacingOverride = `
  * {
    line-height: 1.5 !important;
    letter-spacing: 0.12em !important;
    word-spacing: 0.16em !important;
  }
  p { margin-block-end: 2em !important; }
`;

const stylesheetFiles = [
  "src/styles/tokens.css",
  "src/styles/base.css",
  "src/styles/layout.css",
  "src/styles/components.css",
  "src/styles/world.css",
  "src/styles/print.css",
];

type ServerRenderer = { render: (url: string, inputs: unknown) => Promise<string> };
type InputValidator = { validateProductionInputs: (content: unknown, manifest: unknown, site: unknown, preparedAssetRoot: URL) => unknown };

let mediaVite: ViteDevServer;
let syntheticMediaDocument = "";

function mediaStyles(): string {
  return stylesheetFiles
    .map((file) => {
      const path = resolve(process.cwd(), file);
      return existsSync(path) ? readFileSync(path, "utf8") : "";
    })
    .join("\n");
}

function withSyntheticProjectMedia(contentInput: unknown, manifestInput: unknown): { content: unknown; manifest: unknown } {
  const content = structuredClone(contentInput) as {
    projects: { selected: Array<{ assetIds: string[]; media?: unknown; mediaLayout?: unknown }> };
  };
  const manifest = structuredClone(manifestInput) as { assets: Array<Record<string, unknown>> };
  const media = [
    { kind: "image", assetId: "synthetic-reflow-one", alt: "Synthetic profile evidence.", caption: "Fictional demo profile." },
    { kind: "image", assetId: "synthetic-reflow-two", alt: "Synthetic settings evidence.", caption: "Fictional demo settings." },
    { kind: "image", assetId: "synthetic-reflow-three", alt: "Synthetic schedule evidence.", caption: "Fictional demo schedule." },
  ] as const;
  const project = content.projects.selected[0]!;

  project.assetIds = media.map((presentation) => presentation.assetId);
  project.media = media;
  project.mediaLayout = "portrait-strip";
  manifest.assets.push(...media.map((presentation, index) => ({
    id: presentation.assetId,
    fileName: `${presentation.assetId}.webp`,
    sha256: `${index + 1}`.repeat(64),
    mediaType: "image/webp",
    width: 800,
    height: 1200,
    durationMs: null,
    rightsHolder: "Synthetic test fixture",
    license: "Test-only synthetic asset",
    attribution: "Synthetic test fixture",
  })));

  return { content, manifest };
}

test.beforeAll(async () => {
  mediaVite = await createServer({ server: { middlewareMode: true, hmr: false, ws: false }, appType: "custom" });
  const { render } = await mediaVite.ssrLoadModule("/src/entry-server.ts") as ServerRenderer;
  const { validateProductionInputs } = await mediaVite.ssrLoadModule("/src/content/schemas.ts") as InputValidator;
  const fixture = (file: string): unknown => JSON.parse(readFileSync(resolve(process.cwd(), file), "utf8")) as unknown;
  const syntheticFixture = withSyntheticProjectMedia(
    fixture("content/public/portfolio-content.json"),
    fixture("content/public/asset-manifest.json"),
  );
  const inputs = validateProductionInputs(
    syntheticFixture.content,
    syntheticFixture.manifest,
    fixture("config/site.preview.json"),
    new URL("file:///prepared-assets/"),
  );
  syntheticMediaDocument = `<!doctype html><html lang="en"><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>${mediaStyles()}</style></head><body>${await render("/", inputs)}</body></html>`;
});

test.afterAll(async () => {
  await mediaVite.close();
});

async function assertReflowGeometry(page: Page): Promise<void> {
  const result = await page.evaluate(() => {
    const root = document.documentElement;
    const horizontalCandidates = [
      ...document.querySelectorAll<HTMLElement>(
        ".site-header, .portfolio-main, .portfolio-section, .site-footer, .drive-controls, .journey-hud, h1, h2, h3, p, a, button, input, select, figure, img, video, table",
      ),
    ].filter((element) => {
      const style = getComputedStyle(element);
      const rect = element.getBoundingClientRect();
      return (
        style.display !== "none" &&
        style.visibility !== "hidden" &&
        rect.width > 0 &&
        rect.height > 0
      );
    });
    const clippedText = [
      ...document.querySelectorAll<HTMLElement>(
        "h1, h2, h3, p, li, dt, dd, a, button, label, figcaption, caption, th, td",
      ),
    ].filter((element) => {
      if (element.classList.contains("visually-hidden")) return false;
      const style = getComputedStyle(element);
      return style.overflow === "hidden" || style.textOverflow === "ellipsis";
    });
    const horizontalFailures = horizontalCandidates.flatMap((element) => {
      const rect = element.getBoundingClientRect();
      if (rect.left >= -1 && rect.right <= root.clientWidth + 1) return [];
      return [
        {
          element: element.outerHTML.slice(0, 140),
          left: rect.left,
          right: rect.right,
          clientWidth: root.clientWidth,
        },
      ];
    });
    return {
      clientWidth: root.clientWidth,
      scrollWidth: root.scrollWidth,
      horizontalFailures,
      clippedText: clippedText.map((element) =>
        element.outerHTML.slice(0, 140),
      ),
    };
  });

  expect(result.scrollWidth).toBeLessThanOrEqual(result.clientWidth + 1);
  expect(result.horizontalFailures).toEqual([]);
  expect(result.clippedText).toEqual([]);

  await clickNavigationLink(page, "#contact");
  await expect(page.locator("#contact-heading")).toBeFocused();
  await expect(page.locator('#contact a[href^="mailto:"]')).toBeVisible();
}

test("reflows at a 320 CSS pixel mobile viewport without lost content or controls", async ({
  page,
  distUrl,
}, testInfo) => {
  test.skip(
    testInfo.project.name !== "mobile-chromium",
    "Mobile CSS viewport gate.",
  );
  await page.setViewportSize({ width: 320, height: 800 });
  await page.goto(distUrl, { waitUntil: "domcontentloaded" });
  await assertReflowGeometry(page);
});

test("reflows in desktop Chromium at the effective 320 CSS pixel width produced by 400 percent zoom", async ({
  page,
  distUrl,
}, testInfo) => {
  test.skip(
    testInfo.project.name !== "desktop-chromium",
    "Desktop zoom-equivalent gate.",
  );
  await page.setViewportSize({ width: 320, height: 225 });
  await page.goto(distUrl, { waitUntil: "domcontentloaded" });
  await assertReflowGeometry(page);
});

test("preserves content and controls with the WCAG text-spacing override", async ({
  page,
  distUrl,
}) => {
  await page.setViewportSize({ width: 320, height: 800 });
  await page.goto(distUrl, { waitUntil: "domcontentloaded" });
  await page.addStyleTag({ content: textSpacingOverride });
  await assertReflowGeometry(page);
});

test("keeps synthetic portrait media in DOM order at 320 CSS pixels", async ({ page }) => {
  await page.setViewportSize({ width: 320, height: 800 });
  await page.setContent(syntheticMediaDocument);

  const gallery = page.locator('.project-media-gallery[data-media-layout="portrait-strip"]');
  await expect(gallery).toHaveCount(1);
  expect(await gallery.evaluate((node) => node.scrollWidth <= node.clientWidth || getComputedStyle(node).overflowX === "auto")).toBe(true);
  expect(await gallery.locator("figure").evaluateAll((figures) => figures.map((figure) => figure.textContent)))
    .toEqual(["Fictional demo profile.", "Fictional demo settings.", "Fictional demo schedule."]);
  expect(await page.evaluate(() => document.documentElement.scrollWidth <= document.documentElement.clientWidth)).toBe(true);
});