import path from 'node:path';
import { normalizeWorkspaceRelativePath } from './mindspace-workspace-relative-path.mjs';
import { validatePageForWechatDraft } from './mindspace-wechat-page-draft.mjs';

function normalizePublicHtmlRelativePath(relativePath) {
  const normalized = normalizeWorkspaceRelativePath(relativePath);
  if (!normalized || !normalized.startsWith('public/') || !normalized.toLowerCase().endsWith('.html')) {
    throw Object.assign(new Error('仅支持 workspace 公开 HTML 页面'), { code: 'invalid_public_html_path' });
  }
  return normalized;
}

function titleFromPublicHtml(html, relativePath) {
  const match = String(html ?? '').match(/<title[^>]*>([\s\S]*?)<\/title>/i);
  const fromTitle = match?.[1]?.replace(/\s+/g, ' ').trim();
  if (fromTitle) return fromTitle;
  const basename = path.basename(String(relativePath ?? ''), '.html');
  return basename || 'MindSpace 页面';
}

async function resolvePublicHtmlContext({
  user,
  relativePath,
  mindSpacePages,
  mindSpacePublications,
  readWorkspaceHtml,
}) {
  if (!mindSpacePages) {
    throw Object.assign(new Error('MindSpace 页面服务未启用'), { code: 'mindspace_unavailable' });
  }
  if (typeof readWorkspaceHtml !== 'function') {
    throw Object.assign(new Error('MindSpace 页面读取服务不可用'), { code: 'mindspace_read_unavailable' });
  }

  const normalized = normalizePublicHtmlRelativePath(relativePath);
  const { html: content } = await readWorkspaceHtml({
    userId: user.id,
    relativePath: normalized,
  });

  const page = await mindSpacePages.findPageByRelativePath(user.id, normalized);
  if (!page?.id) {
    throw Object.assign(new Error('无法识别页面对应的 MindSpace 记录'), { code: 'page_not_found' });
  }

  let publicUrl = '';
  if (mindSpacePublications?.getCurrent) {
    const publication = await mindSpacePublications.getCurrent(user.id, page.id);
    publicUrl = publication?.publicUrl ?? '';
  }

  return {
    normalized,
    content,
    page,
    pageTitle: page.title || titleFromPublicHtml(content, normalized),
    pageSummary: page.summary ?? '',
    publicUrl,
  };
}

export async function getQuickWechatDraftFromPublicHtmlStatus({
  user,
  relativePath,
  mindSpacePages,
  mindSpacePublications,
  readWorkspaceHtml,
  getWechatMpConfig,
  getWechatPageDraft,
}) {
  const configService = getWechatMpConfig?.();
  const config = configService
    ? await configService.getConfig(user.id)
    : { configured: false };

  let context = null;
  let validation = null;
  try {
    context = await resolvePublicHtmlContext({
      user,
      relativePath,
      mindSpacePages,
      mindSpacePublications,
      readWorkspaceHtml,
    });
    validation = validatePageForWechatDraft(context.content, {
      pageTitle: context.pageTitle,
      pageSummary: context.pageSummary,
      publicUrl: context.publicUrl,
    });
  } catch (error) {
    if (error?.code === 'page_not_found' || error?.code === 'invalid_public_html_path') {
      return {
        configured: Boolean(config.configured),
        pageId: null,
        canPush: false,
        validation: {
          ok: false,
          profile: 'unknown',
          blockers: [error.message],
          warnings: [],
          estimatedContentLength: 0,
        },
      };
    }
    throw error;
  }

  let latestRun = null;
  const draftService = getWechatPageDraft?.();
  if (draftService?.listRuns) {
    const runs = await draftService.listRuns(user.id, { pageId: context.page.id, limit: 1 });
    latestRun = runs[0] ?? null;
  }

  return {
    configured: Boolean(config.configured),
    pageId: context.page.id,
    pageTitle: context.pageTitle,
    canPush: Boolean(config.configured) && validation.ok,
    validation,
    latestRun,
  };
}

export async function quickWechatDraftFromPublicHtml({
  user,
  relativePath,
  mindSpacePages,
  mindSpacePublications,
  readWorkspaceHtml,
  getWechatPageDraft,
}) {
  const draftService = getWechatPageDraft?.();
  if (!draftService?.pushPageDraft) {
    throw Object.assign(new Error('公众号草稿推送未启用'), { code: 'wechat_draft_unavailable' });
  }

  const context = await resolvePublicHtmlContext({
    user,
    relativePath,
    mindSpacePages,
    mindSpacePublications,
    readWorkspaceHtml,
  });
  const validation = validatePageForWechatDraft(context.content, {
    pageTitle: context.pageTitle,
    pageSummary: context.pageSummary,
    publicUrl: context.publicUrl,
  });
  if (!validation.ok) {
    throw Object.assign(new Error(validation.blockers[0] ?? '页面不符合公众号草稿推送要求'), {
      code: 'wechat_draft_validation_failed',
      validation,
    });
  }

  return draftService.pushPageDraft(user.id, context.page.id, {
    triggeredBy: user.id,
    skipValidation: true,
  });
}