import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { describe, expect, it } from 'vitest';
import type { SiteConfig } from '@/content/types';
import {
  parseHashedArtifactManifest,
  renderNginxConfig,
  // @ts-expect-error The executable ESM build script intentionally has no publishable declaration file.
} from '../../scripts/generate-host-config.mjs';

const jsonLdHash = 'sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=';
const releaseManifestDigest = 'd'.repeat(64);
const productionSite: SiteConfig = {
  environment: 'production',
  canonicalUrl: 'https://portfolio.example.test/',
  buildId: 'release-1',
};
const previewSite: SiteConfig = {
  environment: 'preview',
  canonicalUrl: 'https://portfolio.localhost/',
  buildId: 'preview-1',
};
const manifest = {
  schema: 'portfolio-host-artifact-manifest/v1',
  files: [
    { path: 'assets/app-a1b2c3d4.css', sha256: 'b'.repeat(64) },
    { path: 'assets/app-a1b2c3d4.js', sha256: 'a'.repeat(64) },
    { path: 'assets/demo-c3d4e5f6.webm', sha256: 'c'.repeat(64) },
  ],
};

describe('generated Nginx static-host contract', () => {
  it('binds immutable caching to the exact hashed artifact manifest', () => {
    const config = renderNginxConfig({
      site: productionSite,
      jsonLdCspHash: jsonLdHash,
      artifactManifest: manifest,
      documentRoot: '/srv/portfolio/current',
      alternateHosts: ['www.portfolio.example.test'],
      tlsCertificatePath: '/etc/portfolio/tls/fullchain.pem',
      tlsKeyPath: '/etc/portfolio/tls/privkey.pem',
      manifestDigest: releaseManifestDigest,
    });

    for (const file of manifest.files) expect(config).toContain(`~^/${file.path.replaceAll('.', '\\.')}$`);
    expect(config).toContain('public, max-age=31536000, immutable');
    expect(config).toContain('public, max-age=0, must-revalidate');
    expect(config).toContain(
      'Requires standard MIME mappings and static-file defaults in the parent Nginx http context.',
    );
    expect(config).not.toContain('include /etc/nginx/mime.types;');
    expect(config).not.toContain('default_type application/octet-stream;');
    expect(config).not.toContain('sendfile on;');
    expect(config).toContain('max_ranges 1;');
    expect(config).not.toContain('max_ranges 0');
  });

  it('redirects HTTP and an alternate HTTPS host directly to the canonical HTTPS host', () => {
    const config = renderNginxConfig({
      site: productionSite,
      jsonLdCspHash: jsonLdHash,
      artifactManifest: manifest,
      documentRoot: '/srv/portfolio/current',
      alternateHosts: ['www.portfolio.example.test'],
      tlsCertificatePath: '/etc/portfolio/tls/fullchain.pem',
      tlsKeyPath: '/etc/portfolio/tls/privkey.pem',
      manifestDigest: releaseManifestDigest,
    });

    expect(config).toContain('listen 80;');
    expect(config).toContain('server_name portfolio.example.test www.portfolio.example.test;');
    expect(config.match(/return 308 https:\/\/portfolio\.example\.test\$request_uri;/gu)).toHaveLength(2);
    expect(config).not.toMatch(/return 30[127] /u);
    expect(config).not.toContain('http://portfolio.example.test');
  });

  it('applies exact browser headers and production indexability without public source maps', () => {
    const config = renderNginxConfig({
      site: productionSite,
      jsonLdCspHash: jsonLdHash,
      artifactManifest: manifest,
      documentRoot: '/srv/portfolio/current',
      alternateHosts: [],
      tlsCertificatePath: '/etc/portfolio/tls/fullchain.pem',
      tlsKeyPath: '/etc/portfolio/tls/privkey.pem',
      manifestDigest: releaseManifestDigest,
    });

    expect(config).toContain("default-src 'self'; script-src 'self' 'sha256-");
    expect(config).toContain("img-src 'self' data:");
    expect(config).toContain("connect-src 'self'");
    expect(config).toContain('add_header Strict-Transport-Security "max-age=31536000" always;');
    expect(config).toContain(`add_header X-Portfolio-Manifest-Digest "${releaseManifestDigest}" always;`);
    expect(config).toContain('gzip on;');
    expect(config).toContain('gzip_min_length 1;');
    expect(config).toContain('gzip_vary on;');
    expect(config).toContain('gzip_types text/css application/javascript application/json image/svg+xml;');
    expect(config).not.toContain('includeSubDomains');
    expect(config).not.toContain('X-Robots-Tag');
    expect(config).not.toMatch(/unsafe-inline|unsafe-eval|sourceMappingURL|\.map(?:\s|$)/u);
  });

  it('makes preview responses private and noindex without a sitemap or HSTS', () => {
    const config = renderNginxConfig({
      site: previewSite,
      jsonLdCspHash: jsonLdHash,
      artifactManifest: manifest,
      documentRoot: '/srv/portfolio/preview',
      alternateHosts: [],
    });

    expect(config).toContain('add_header X-Robots-Tag "noindex, nofollow, noarchive" always;');
    expect(config).toContain('private, no-store');
    expect(config).not.toContain('Strict-Transport-Security');
    expect(config).not.toContain('sitemap.xml');
    expect(config).not.toContain('X-Portfolio-Manifest-Digest');
  });

  it('rejects production configuration without the signed manifest digest', () => {
    expect(() => renderNginxConfig({
      site: productionSite,
      jsonLdCspHash: jsonLdHash,
      artifactManifest: manifest,
      documentRoot: '/srv/portfolio/current',
      alternateHosts: [],
      tlsCertificatePath: '/etc/portfolio/tls/fullchain.pem',
      tlsKeyPath: '/etc/portfolio/tls/privkey.pem',
    })).toThrow(/manifest digest/i);
  });

  it.each([
    {
      name: 'a source map',
      value: {
        ...manifest,
        files: [{ path: 'assets/app-a1b2c3d4.js.map', sha256: 'a'.repeat(64) }],
      },
    },
    {
      name: 'an external or unsafe path',
      value: {
        ...manifest,
        files: [{ path: '../app-a1b2c3d4.js', sha256: 'a'.repeat(64) }],
      },
    },
    {
      name: 'a non-canonical digest',
      value: {
        ...manifest,
        files: [{ path: 'assets/app-a1b2c3d4.js', sha256: 'A'.repeat(64) }],
      },
    },
  ])('rejects $name in the hashed artifact manifest', ({ value }) => {
    expect(() => parseHashedArtifactManifest(value)).toThrow(/artifact manifest/i);
  });

  it('rejects document-root values that cannot be emitted as one Nginx token', () => {
    expect(() =>
      renderNginxConfig({
        site: previewSite,
        jsonLdCspHash: jsonLdHash,
        artifactManifest: manifest,
        documentRoot: '/srv/portfolio/injected root',
        alternateHosts: [],
      }),
    ).toThrow(/document root/i);
  });

  it('ships a domain-neutral example instead of inventing Luca’s production hostname', () => {
    const example = readFileSync(resolve(process.cwd(), 'nginx.portfolio.conf.example'), 'utf8');

    expect(example).toContain('__CANONICAL_HOST__');
    expect(example).toContain('__JSON_LD_CSP_HASH__');
    expect(example).toContain('__MANIFEST_DIGEST__');
    expect(example).not.toContain('portfolio.example.test');
    expect(example).not.toMatch(/server_name\s+[a-z0-9.-]+\.[a-z]{2,}/iu);
  });
});