/*
 * Copyright (C) 2025 Jakub Žitník
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

import puppeteer from 'puppeteer';
import path from 'path';
import fs from 'fs';
import parseThisShit from './parse.js';
import 'dotenv/config';

const EMAIL = process.env.EMAIL;
const PASSWORD = process.env.PASSWORD;
const SHAREPOINT_URL = process.env.SHAREPOINT_URL || 'https://spsejecnacz.sharepoint.com/:x:/s/nastenka/ESy19K245Y9BouR5ksciMvgBu3Pn_9EaT0fpP8R6MrkEmg';
const VOLUME_PATH = path.resolve('./volume/browser');

async function clearDownloadsFolder() {
  try {
    await fs.promises.rm('./downloads', { recursive: true, force: true });
    await fs.promises.mkdir('./downloads');
  } catch (err) {
    console.error('Error:', err);
  }
}

async function handleError(page, err) {
  try {
    const errorsDir = path.resolve('./errors');
    if (!fs.existsSync(errorsDir)) fs.mkdirSync(errorsDir);

    const timestamp = new Date().toISOString().replace(/[:.]/g, '-');
    const filePath = path.join(errorsDir, `error-${timestamp}.png`);

    await page.screenshot({ path: filePath, fullPage: true });
    console.error(`❌ Error occurred. Screenshot saved: ${filePath}`);

    // Keep only last 10 screenshots
    const files = fs.readdirSync(errorsDir)
      .map(f => ({
        name: f,
        time: fs.statSync(path.join(errorsDir, f)).mtime.getTime()
      }))
      .sort((a, b) => b.time - a.time);

    if (files.length > 10) {
      const oldFiles = files.slice(10);
      for (const f of oldFiles) {
        fs.unlinkSync(path.join(errorsDir, f.name));
      }
    }
  } catch (screenshotErr) {
    console.error('Failed to take screenshot:', screenshotErr);
  }
  console.error(err);
}

(async () => {
  let browser, page;
  try {
    browser = await puppeteer.launch({
      headless: 'new',
      userDataDir: VOLUME_PATH,
      args: ['--no-sandbox', '--disable-setuid-sandbox']
    });
    [page] = await browser.pages();

    const downloadPath = path.resolve('./downloads');
    if (!fs.existsSync(downloadPath)) fs.mkdirSync(downloadPath);

    const client = await page.createCDPSession();
    await client.send('Page.setDownloadBehavior', {
      behavior: 'allow',
      downloadPath: downloadPath,
    });

    await page.goto(SHAREPOINT_URL, { waitUntil: 'networkidle2' });

    await new Promise(r => setTimeout(r, 3000));

    if (page.url().includes('login.')) {
      console.log('Logging in...');

      try {
        await page.waitForSelector('input[type="email"]', { timeout: 3000 });
        await page.type('input[type="email"]', EMAIL, { delay: 50 });
        await page.keyboard.press('Enter');
      } catch {
        try {
          await page.waitForSelector(".table");
          await page.click('.table');
        } catch {}
      }
      await new Promise(r => setTimeout(r, 2000));

      try {
        await page.waitForSelector('div[role="button"]', { timeout: 5000 });
        const signInButtons = await page.$$('div[role="button"]');
        for (const btn of signInButtons) {
          const text = await page.evaluate(el => el.innerText, btn);
          if (text && text.includes('with password')) {
            console.log('Clicking "Sign in with password"...');
            await btn.click();
            break;
          }
        }
      } catch {
        console.log('"Sign in with password" button not found, continuing...');
      }

      await page.waitForSelector('input[type="password"]', { timeout: 100000 });
      await page.type('input[type="password"]', PASSWORD, { delay: 50 });
      await page.keyboard.press('Enter');

      try {
        await page.waitForSelector('input[type="submit"]', { timeout: 10000 });
        await page.click('input[type="submit"]');
      } catch {
        console.log('No stay signed in prompt.');
      }

      await page.waitForNavigation({ waitUntil: 'networkidle2' });
    }

    await new Promise(r => setTimeout(r, 5000));

    const frameHandle = await page.waitForSelector('iframe');
    const frame = await frameHandle.contentFrame();

    await frame.waitForSelector('button[title="File"]', { timeout: 60000 });
    await frame.click('button[title="File"]');
    await new Promise(r => setTimeout(r, 500));

    try {
      await frame.waitForSelector('div[role="menuitem"][name="Create a Copy"]', { visible: true });
    } catch {
      await frame.click('button[title="File"]');
      await new Promise(r => setTimeout(r, 500));
    }
    await frame.click('div[role="menuitem"][name="Create a Copy"]');
    await new Promise(r => setTimeout(r, 500));

    await frame.waitForSelector('div[role="menuitem"][name="Download a Copy"]', { visible: true });
    await frame.click('div[role="menuitem"][name="Download a Copy"]');

    await new Promise(r => setTimeout(r, 10000));

    function waitForFile(filename, timeout = 30000) {
      return new Promise((resolve, reject) => {
        const start = Date.now();
        const interval = setInterval(() => {
          if (fs.existsSync(filename)) {
            clearInterval(interval);
            resolve();
          } else if (Date.now() - start > timeout) {
            clearInterval(interval);
            reject(new Error('Timeout waiting for file'));
          }
        }, 500);
      });
    }

    function getNewestFile(dir) {
      const files = fs.readdirSync(dir)
        .map(f => ({
          name: f,
          time: fs.statSync(path.join(dir, f)).mtime.getTime()
        }))
        .sort((a, b) => b.time - a.time);
      return files.length ? path.join(dir, files[0].name) : null;
    }

    const downloadedFilePath = getNewestFile(downloadPath);
    if (!downloadedFilePath) {
      throw new Error('No XLSX file found in download folder');
    }
    console.log('Waiting for file:', downloadedFilePath);
    await waitForFile(downloadedFilePath);

    await fs.promises.cp(downloadedFilePath, "db/current.xlsx");

    await parseThisShit(downloadedFilePath);
    await clearDownloadsFolder();

    await browser.close();
  } catch (err) {
    if (page) {
      await handleError(page, err);
    } else {
      console.error('Fatal error before page init:', err);
    }
    if (browser) await browser.close();
    process.exit(1);
  }
})();