import fs from 'node:fs';

const STUB_MARKERS = ['临时补出', '服务号兜底', '服务号自动补出简版页面'];

export function isStubPublicHtmlContent(content) {
  const value = String(content ?? '');
  return STUB_MARKERS.some((marker) => value.includes(marker));
}

export function artifactFileExists(artifact) {
  const localPath = String(artifact?.localPath ?? '').trim();
  if (!localPath) return false;
  try {
    return fs.existsSync(localPath) && fs.statSync(localPath).isFile();
  } catch {
    return false;
  }
}

export function isStubPublicHtmlArtifact(artifact) {
  const localPath = String(artifact?.localPath ?? '').trim();
  if (!localPath) return false;
  try {
    return isStubPublicHtmlContent(fs.readFileSync(localPath, 'utf8'));
  } catch {
    return false;
  }
}

/** Real HTML artifacts only — never fall back to stub placeholders. */
export function filterSendableHtmlArtifacts(artifacts = []) {
  return artifacts.filter((artifact) => artifactFileExists(artifact) && !isStubPublicHtmlArtifact(artifact));
}

export function selectSendableHtmlArtifacts({ verifiedArtifacts = [], confirmedArtifacts = [] } = {}) {
  const candidates = verifiedArtifacts.length > 0 ? verifiedArtifacts : confirmedArtifacts;
  return filterSendableHtmlArtifacts(candidates);
}

export function verifyPageArtifactContent(artifact, { minBytes = 512 } = {}) {
  if (!artifactFileExists(artifact)) {
    return { ok: false, reason: 'missing_file' };
  }
  if (isStubPublicHtmlArtifact(artifact)) {
    return { ok: false, reason: 'stub_placeholder' };
  }
  const size = fs.statSync(artifact.localPath).size;
  if (size < minBytes) {
    return { ok: false, reason: 'too_small' };
  }
  const content = fs.readFileSync(artifact.localPath, 'utf8');
  if (!/<(?:html|body|main|article)\b/i.test(content)) {
    return { ok: false, reason: 'not_html_document' };
  }
  return { ok: true, reason: null };
}