/**
 * 从 MindSpace 公开 HTML 中解析 Page Data API 引用的 dataset 与读写意图。
 */

export function detectPageDataDatasetUsageFromHtml(html) {
  const text = String(html ?? '');
  const datasets = new Map();

  for (const match of text.matchAll(/\.insertRow\(\s*['"]([^'"]+)['"]/g)) {
    const name = match[1];
    const prev = datasets.get(name) ?? {};
    datasets.set(name, { ...prev, insert: true });
  }
  for (const match of text.matchAll(/\.listRows\(\s*['"]([^'"]+)['"]/g)) {
    const name = match[1];
    const prev = datasets.get(name) ?? {};
    datasets.set(name, { ...prev, read: true });
  }

  return datasets;
}

export function assertPolicyMatchesHtmlDatasets(html, policyDatasets) {
  const usage = detectPageDataDatasetUsageFromHtml(html);
  const htmlNames = [...usage.keys()].sort();
  const policyNames = Object.keys(policyDatasets ?? {}).sort();
  if (!htmlNames.length) return usage;
  if (htmlNames.join(',') !== policyNames.join(',')) {
    throw Object.assign(
      new Error(
        `Page Data 策略 dataset（${policyNames.join(', ') || '无'}）与 HTML 中 insertRow/listRows 引用的 dataset（${htmlNames.join(', ')}）不一致。请使用与页面脚本相同的 dataset 名称。`,
      ),
      {
        code: 'dataset_policy_html_mismatch',
        htmlDatasets: htmlNames,
        policyDatasets: policyNames,
      },
    );
  }
  return usage;
}

export function buildPageDataPolicyDatasetsFromRegistry({ html, registryDatasets, usage }) {
  const detected = usage ?? detectPageDataDatasetUsageFromHtml(html);
  if (!detected.size) return null;

  const registryMap = new Map(registryDatasets.map((dataset) => [dataset.name, dataset]));
  const datasets = {};

  for (const [name, perms] of detected) {
    const registered = registryMap.get(name);
    if (!registered) {
      throw Object.assign(
        new Error(`HTML 引用的 dataset「${name}」尚未注册，请先执行 private_data_register_dataset`),
        { code: 'dataset_not_registered', datasetName: name },
      );
    }

    const entry = {
      insert: false,
      read: false,
      update: false,
      softDelete: false,
      hardDelete: false,
      columns: {},
    };

    if (perms.insert && !perms.read) {
      entry.insert = true;
      entry.columns.insert = registered.columns?.insert ?? [];
    } else if (perms.read && !perms.insert) {
      entry.read = true;
      entry.columns.read = registered.columns?.read ?? [];
    } else {
      if (perms.insert) {
        entry.insert = true;
        entry.columns.insert = registered.columns?.insert ?? [];
      }
      if (perms.read) {
        entry.read = true;
        entry.columns.read = registered.columns?.read ?? [];
      }
    }

    datasets[name] = entry;
  }

  return datasets;
}