import { VercelRequest, VercelResponse } from '@vercel/node';
import { readFileSync } from 'fs';
import { join } from 'path';

const GITBOOK_API_TOKEN = process.env.GITBOOK_API_TOKEN || 'gb_api_jORqpp2qlvg7pwlPiIKHAbgcFIDJBIJ1pz09WpIg';
const GITBOOK_SPACE_ID = process.env.GITBOOK_SPACE_ID || '37ITJTgjD56eN3ZI5qtt';

const PAGES = [
  { title: 'Welcome to AeThex Documentation', slug: 'overview', file: '01-overview.md' },
  { title: 'Getting Started', slug: 'getting-started', file: '02-getting-started.md' },
  { title: 'Platform Guide', slug: 'platform', file: '03-platform.md' },
  { title: 'API Reference', slug: 'api-reference', file: '04-api-reference.md' },
  { title: 'Tutorials', slug: 'tutorials', file: '05-tutorials.md' },
  { title: 'CLI Tools', slug: 'cli', file: '06-cli.md' },
  { title: 'Code Examples', slug: 'examples', file: '07-examples.md' },
  { title: 'Integrations', slug: 'integrations', file: '08-integrations.md' },
  { title: 'Curriculum', slug: 'curriculum', file: '09-curriculum.md' },
];

async function makeRequest(method: string, path: string, body?: any): Promise<any> {
  const response = await fetch(`https://api.gitbook.com/v1${path}`, {
    method,
    headers: {
      Authorization: `Bearer ${GITBOOK_API_TOKEN}`,
      'Content-Type': 'application/json',
      'User-Agent': 'AeThex-Docs-Sync',
    },
    body: body ? JSON.stringify(body) : undefined,
  });

  if (!response.ok) {
    const errorText = await response.text();
    throw new Error(`API Error: ${response.status} - ${errorText}`);
  }

  return response.json();
}

export default async function handler(
  req: VercelRequest,
  res: VercelResponse,
) {
  // Only allow POST requests
  if (req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  try {
    const results = [];
    let successful = 0;
    let failed = 0;

    for (const page of PAGES) {
      try {
        const filePath = join(process.cwd(), 'docs-migration', page.file);
        const content = readFileSync(filePath, 'utf-8');

        const body = {
          title: page.title,
          description: `AeThex Documentation - ${page.title}`,
          document: {
            markdown: content,
          },
        };

        await makeRequest('POST', `/spaces/${GITBOOK_SPACE_ID}/pages`, body);
        results.push({ page: page.title, status: 'success' });
        successful++;
      } catch (error) {
        const errorMessage = error instanceof Error ? error.message : 'Unknown error';
        results.push({ page: page.title, status: 'failed', error: errorMessage });
        failed++;
      }

      // Small delay between requests
      await new Promise((resolve) => setTimeout(resolve, 500));
    }

    return res.status(200).json({
      message: 'Sync complete',
      successful,
      failed,
      results,
    });
  } catch (error) {
    const errorMessage = error instanceof Error ? error.message : 'Unknown error';
    return res.status(500).json({ error: errorMessage });
  }
}