import assert from "node:assert/strict";
import { readdirSync, readFileSync } from "node:fs";
import { extname, join } from "node:path";
import test from "node:test";
import { fileURLToPath } from "node:url";

const layout = readFileSync(new URL("../src/app/layout.tsx", import.meta.url), "utf8");
const siteStyles = readFileSync(new URL("../src/app/site-styles.ts", import.meta.url), "utf8");
const adminLayout = readFileSync(new URL("../src/app/admin/layout.tsx", import.meta.url), "utf8");
const adminCss = readFileSync(new URL("../src/app/admin/admin.css", import.meta.url), "utf8");
const homePage = readFileSync(new URL("../src/app/page.tsx", import.meta.url), "utf8");
const loginPage = readFileSync(new URL("../src/app/login/page.tsx", import.meta.url), "utf8");

test("Inter is loaded through next/font and applied as a CSS variable", () => {
  assert.match(layout, /import localFont from "next\/font\/local"/);
  assert.doesNotMatch(layout, /from ["']next\/font\/google["']/);
  assert.match(layout, /src: "\.\/fonts\/InterVariable-latin\.woff2"/);
  assert.match(layout, /display: "swap"/);
  assert.match(layout, /variable: "--font-inter"/);
  assert.match(layout, /className=\{inter\.variable\}/);
  assert.match(readFileSync(new URL("../src/app/globals.css", import.meta.url), "utf8"), /var\(--font-inter, Inter\)/);
  assert.match(
    readFileSync(new URL("../src/components/admin/admin-app.tsx", import.meta.url), "utf8"),
    /var\(--font-inter, Inter\)/,
  );
});

test("Inter is vendored locally so production builds do not fetch Google Fonts", () => {
  const font = readFileSync(new URL("../src/app/fonts/InterVariable-latin.woff2", import.meta.url));
  assert.equal(Buffer.from(font.subarray(0, 4)).toString(), "wOF2");
  assert.ok(font.byteLength > 20_000);
  const srcRoot = fileURLToPath(new URL("../src/", import.meta.url));
  const stack = [srcRoot];
  while (stack.length > 0) {
    const dir = stack.pop()!;
    for (const entry of readdirSync(dir, { withFileTypes: true })) {
      const fullPath = join(dir, entry.name);
      if (entry.isDirectory()) {
        stack.push(fullPath);
        continue;
      }
      if (![".ts", ".tsx", ".js", ".jsx", ".css"].includes(extname(entry.name))) continue;
      const source = readFileSync(fullPath, "utf8");
      assert.doesNotMatch(
        source,
        /from ["']next\/font\/google["']|fonts\.googleapis\.com/,
        `${fullPath} must not fetch Google Fonts at build time`,
      );
    }
  }
});

test("site chrome owns globals.css; admin does not import it", () => {
  assert.match(siteStyles, /import "\.\/globals\.css"/);
  assert.match(siteStyles, /import "\.\/birth-time-choice\.css"/);
  assert.doesNotMatch(layout, /globals\.css|birth-time-choice\.css|site-styles/);
  assert.match(homePage, /import "@\/app\/site-styles"/);
  assert.match(loginPage, /import "\.\.\/site-styles"/);
  assert.doesNotMatch(adminLayout, /globals\.css|site-styles/);
  assert.doesNotMatch(
    readFileSync(new URL("../src/app/error.tsx", import.meta.url), "utf8"),
    /site-styles|globals\.css/,
  );
  assert.doesNotMatch(
    readFileSync(new URL("../src/app/not-found.tsx", import.meta.url), "utf8"),
    /site-styles|globals\.css/,
  );
  assert.match(adminCss, /--font-body: StyreneB, var\(--font-inter, Inter\)/);
});

test("root error and not-found pages do not depend on Tailwind utilities or Button", () => {
  const errorPage = readFileSync(new URL("../src/app/error.tsx", import.meta.url), "utf8");
  const notFoundPage = readFileSync(new URL("../src/app/not-found.tsx", import.meta.url), "utf8");
  for (const source of [errorPage, notFoundPage]) {
    assert.doesNotMatch(source, /className="flex/);
    assert.doesNotMatch(source, /min-h-svh/);
    assert.doesNotMatch(source, /text-muted-foreground/);
    assert.doesNotMatch(source, /@\/components\/ui\/button/);
  }
});