import { mkdtemp, mkdir, readFile, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join, resolve } from 'node:path';
import { pathToFileURL } from 'node:url';
import { afterEach, describe, expect, it } from 'vitest';
import { loadProductionInputs } from '@/content/load-production-inputs';
import { createPageMetadata, createStaticHostArtifacts } from '@/content/metadata';
import { render } from '@/entry-server';
import { assemblePrerenderedHtml, type ViteManifest } from '../../scripts/prerender.mjs';
import { verifyArtifactDirectory } from '../../scripts/verify-artifacts.mjs';
import type { ProductionInputs, SiteConfig } from '@/content/types';

const repositoryRoot = process.cwd();
const locations = {
  contentJson: pathToFileURL(resolve(repositoryRoot, 'content/public/portfolio-content.json')),
  assetManifestJson: pathToFileURL(resolve(repositoryRoot, 'content/public/asset-manifest.json')),
  preparedAssetRoot: pathToFileURL(`${resolve(repositoryRoot, 'inputs/prepared-assets')}/`),
  siteConfigJson: pathToFileURL(resolve(repositoryRoot, 'config/site.preview.json')),
};
const manifest: ViteManifest = {
  'index.html': {
    file: 'assets/index-test.js',
    src: 'index.html',
    isEntry: true,
    css: ['assets/index-test.css'],
  },
};
const template = `<!doctype html><html lang="en"><head><meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>Portfolio</title>
<!--portfolio-head-->
<script type="module" crossorigin src="/assets/index-test.js"></script>
<link rel="stylesheet" href="/assets/index-test.css"></head><body><div id="app"></div>
<!--portfolio-body--></body></html>`;

const temporaryDirectories: string[] = [];
afterEach(async () => {
  await Promise.all(temporaryDirectories.splice(0).map((directory) => rm(directory, { recursive: true, force: true })));
});

const writeValidArtifacts = async (site?: SiteConfig) => {
  const loaded = await loadProductionInputs(locations);
  const inputs: Readonly<ProductionInputs> = site === undefined ? loaded : { ...loaded, site };
  const directory = await mkdtemp(join(tmpdir(), 'portfolio-artifacts-'));
  temporaryDirectories.push(directory);
  await mkdir(join(directory, 'assets'));
  const html = assemblePrerenderedHtml(template, manifest, await render('/', inputs), inputs);
  const hostArtifacts = createStaticHostArtifacts(createPageMetadata(inputs.content, inputs.manifest, inputs.site), inputs.site);
  await Promise.all([
    writeFile(join(directory, 'index.html'), html),
    writeFile(join(directory, 'robots.txt'), hostArtifacts.robots),
    writeFile(join(directory, '_headers.example'), hostArtifacts.headers),
    writeFile(join(directory, '_redirects.example'), hostArtifacts.redirects),
    writeFile(join(directory, 'assets/index-test.js'), 'export {};\n'),
    writeFile(join(directory, 'assets/index-test.css'), 'body { margin: 0; }\n'),
    ...(hostArtifacts.sitemap === undefined
      ? []
      : [writeFile(join(directory, 'sitemap.xml'), hostArtifacts.sitemap)]),
  ]);
  return { directory, html, inputs };
};

describe('artifact verification', () => {
  it('accepts the complete private preview artifact set', async () => {
    const { directory, inputs } = await writeValidArtifacts();

    await expect(verifyArtifactDirectory(directory, inputs)).resolves.toBeUndefined();
  });

  it('accepts the pure production artifact path with canonical sitemap and allow policy', async () => {
    const productionSite: SiteConfig = {
      environment: 'production',
      canonicalUrl: 'https://portfolio.example.test/',
      buildId: 'production-test',
    };
    const { directory, inputs } = await writeValidArtifacts(productionSite);

    await expect(verifyArtifactDirectory(directory, inputs)).resolves.toBeUndefined();
  });

  it.each([
    {
      name: 'an unexpected preview sitemap',
      mutate: async (directory: string) => writeFile(join(directory, 'sitemap.xml'), '<urlset />'),
      error: /preview.*sitemap/i,
    },
    {
      name: 'a source map',
      mutate: async (directory: string) => writeFile(join(directory, 'assets/index-test.js.map'), '{}'),
      error: /source map|unexpected artifact/i,
    },
    {
      name: 'an unknown artifact',
      mutate: async (directory: string) => writeFile(join(directory, 'private-notes.txt'), 'notes'),
      error: /unexpected artifact/i,
    },
    {
      name: 'a prohibited private surface',
      mutate: async (directory: string) => writeFile(join(directory, 'assets/index-test.js'), 'const evidenceId = "fixture";'),
      error: /prohibited surface/i,
    },
  ])('rejects $name', async ({ mutate, error }) => {
    const { directory, inputs } = await writeValidArtifacts();
    await mutate(directory);

    await expect(verifyArtifactDirectory(directory, inputs)).rejects.toThrow(error);
  });

  it.each([
    {
      name: 'duplicate canonical metadata',
      mutate: (html: string) => html.replace('</head>', '<link rel="canonical" href="https://portfolio.localhost/" /></head>'),
      error: /exactly one canonical/i,
    },
    {
      name: 'duplicate H1 identity',
      mutate: (html: string) => html.replace('</main>', '<h1>Luca Pîslaru</h1></main>'),
      error: /exactly one h1/i,
    },
    {
      name: 'malformed JSON-LD',
      mutate: (html: string) => html.replace(/<script type="application\/ld\+json">.*?<\/script>/u, '<script type="application/ld+json">{</script>'),
      error: /json-ld/i,
    },
    {
      name: 'missing infrastructure evidence',
      mutate: (html: string) => html.replace('id="infrastructure"', 'id="removed-infrastructure"'),
      error: /section.*infrastructure/i,
    },
    {
      name: 'executable snapshot assignment',
      mutate: (html: string) => html.replace('<script id="portfolio-inputs" type="application/json">', '<script>window.__PORTFOLIO_INPUTS__='),
      error: /inert input snapshot|prohibited surface/i,
    },
  ])('rejects raw HTML with $name', async ({ mutate, error }) => {
    const { directory, html, inputs } = await writeValidArtifacts();
    await writeFile(join(directory, 'index.html'), mutate(html));

    await expect(verifyArtifactDirectory(directory, inputs)).rejects.toThrow(error);
  });

  it('rejects a missing crawl artifact', async () => {
    const { directory, inputs } = await writeValidArtifacts();
    await rm(join(directory, 'robots.txt'));

    await expect(verifyArtifactDirectory(directory, inputs)).rejects.toThrow(/robots/i);
  });

  it('checks the CSP hash against the actual serialized JSON-LD bytes', async () => {
    const { directory, inputs } = await writeValidArtifacts();
    const headersPath = join(directory, '_headers.example');
    const headers = await readFile(headersPath, 'utf8');
    await writeFile(headersPath, headers.replace(/sha256-[A-Za-z0-9+/=]+/u, 'sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA='));

    await expect(verifyArtifactDirectory(directory, inputs)).rejects.toThrow(/csp.*json-ld|json-ld.*csp/i);
  });
});