const { chromium } = require('playwright');
const fs = require('fs');
const path = require('path');
const TurndownService = require('turndown');

const turndownService = new TurndownService();
const OUTPUT_DIR = process.env.OUTPUT_DIR || '/tmp/crawlapi';

function parseOptions(raw) {
  try {
    return JSON.parse(raw);
  } catch {
    return {};
  }
}

function parseUrl(raw) {
  try {
    return JSON.parse(raw);
  } catch {
    return raw.replace(/^"|"$/g, '');
  }
}

function ensureDir(dir) {
  if (!fs.existsSync(dir)) {
    fs.mkdirSync(dir, { recursive: true });
  }
}

function writeFile(filename, data) {
  ensureDir(OUTPUT_DIR);
  const filepath = path.join(OUTPUT_DIR, filename);
  fs.writeFileSync(filepath, data);
  return filepath;
}

async function run() {
  const endpoint = process.argv[2];
  const url = parseUrl(process.argv[3]);
  const options = parseOptions(process.argv[4]);

  const browser = await chromium.launch({ headless: true });
  const context = await browser.newContext({
    viewport: {
      width: options.width || 1440,
      height: options.height || 900,
    },
    userAgent: options.user_agent || undefined,
  });
  const page = await context.newPage();

  try {
    const timeout = (options.timeout || 30) * 1000;
    await page.goto(url, { waitUntil: 'networkidle', timeout });

    if (options.wait_for) {
      await page.waitForSelector(options.wait_for, { timeout });
    }

    let result = {};

    switch (endpoint) {
      case 'crawl': {
        const html = await page.content();
        const title = await page.title();
        result = { html, title, url: page.url() };
        break;
      }
      case 'content': {
        const html = await page.content();
        result = { html, url: page.url() };
        break;
      }
      case 'screenshot': {
        const screenshotOptions = { type: 'png' };
        if (options.full_page) {
          screenshotOptions.fullPage = true;
        }
        const buffer = await page.screenshot(screenshotOptions);
        const filepath = writeFile(`${Date.now()}.png`, buffer);
        result = { file_path: filepath, url: page.url() };
        break;
      }
      case 'pdf': {
        const buffer = await page.pdf({
          format: 'A4',
          printBackground: true,
        });
        const filepath = writeFile(`${Date.now()}.pdf`, buffer);
        result = { file_path: filepath, url: page.url() };
        break;
      }
      case 'markdown': {
        const html = await page.content();
        const markdown = turndownService.turndown(html);
        result = { markdown, url: page.url() };
        break;
      }
      case 'snapshot': {
        const html = await page.content();
        const screenshotBuffer = await page.screenshot({ type: 'png', fullPage: options.full_page || false });
        const filepath = writeFile(`${Date.now()}.png`, screenshotBuffer);
        result = { html, file_path: filepath, url: page.url() };
        break;
      }
      case 'scrape': {
        const selectors = options.selectors || ['h1', 'h2', 'p', 'a'];
        const data = {};
        for (const selector of selectors) {
          const elements = await page.locator(selector).all();
          const texts = [];
          for (const el of elements) {
            const text = await el.textContent();
            if (text) texts.push(text.trim());
          }
          data[selector] = texts;
        }
        result = { data, url: page.url() };
        break;
      }
      case 'json': {
        const title = await page.title();
        const description = await page.locator('meta[name="description"]').getAttribute('content').catch(() => null);
        const headings = await page.locator('h1, h2, h3').allTextContents();
        const links = await page.locator('a[href]').evaluateAll(els => els.map(el => ({ href: el.href, text: el.textContent?.trim() })));
        result = { title, description, headings, links: links.slice(0, 50), url: page.url() };
        break;
      }
      case 'links': {
        const links = await page.locator('a[href]').evaluateAll(els =>
          els.map(el => ({
            href: el.href,
            text: el.textContent?.trim() || '',
          })).filter(l => l.href)
        );
        result = { links: [...new Map(links.map(l => [l.href, l])).values()], url: page.url() };
        break;
      }
      default:
        throw new Error(`Unknown endpoint: ${endpoint}`);
    }

    console.log(JSON.stringify(result));
  } catch (error) {
    console.error(error.message);
    process.exit(1);
  } finally {
    await browser.close();
  }
}

run();