const express = require('express');
const { exec } = require('child_process');
const path = require('path');
const cors = require('cors');
const fs = require('fs');
const cron = require('node-cron');
const app = express();
const port = 5001;

app.use(express.json());
app.use(cors());

function escapePythonString(str) {
  return str.replace(/\\/g, '\\\\')
            .replace(/'/g, "\\'")
            .replace(/\n/g, '\\n')
            .replace(/\t/g, '\\t');
}

// Read credentials from JSON file
const credentials = JSON.parse(fs.readFileSync(path.join(__dirname, 'credentials.json'), 'utf8'));
const escapedUsername = escapePythonString(credentials.username);
const escapedPassword = escapePythonString(credentials.password);

const baseDir = path.join(__dirname, 'downloads');
const dateStr = new Date().toISOString().split('T')[0];
const dateDir = path.join(baseDir, dateStr);

function downloadContent() {
  const influencers = JSON.parse(fs.readFileSync(path.join(__dirname, 'influencers.json'), 'utf8')).profiles;

  const script = `
import instaloader
import os

L = instaloader.Instaloader()
L.login('${escapedUsername}', '${escapedPassword}')
PROFILES = ${JSON.stringify(influencers)}
BASE_DIR = "${dateDir.replace(/\\/g, '/')}"

os.makedirs(BASE_DIR, exist_ok=True)

def download_posts(profile):
    profile_dir = os.path.join(BASE_DIR, profile)
    os.makedirs(profile_dir, exist_ok=True)
    L.dirname_pattern = profile_dir
    posts = instaloader.Profile.from_username(L.context, profile).get_posts()
    for post in posts:
        if post.typename == 'GraphVideo':  # Only download videos
            L.download_post(post, target=profile)
        elif post.typename == 'GraphImage':  # Only download images
            L.download_post(post, target=profile)

for profile in PROFILES:
    download_posts(profile)
`;

  const scriptPath = path.join(__dirname, 'download_script.py');
  fs.writeFileSync(scriptPath, script);

  exec(`python3 ${scriptPath}`, (error, stdout, stderr) => {
    if (error) {
      console.error(`Error: ${error.message}`);
    }
    if (stderr) {
      console.error(`Stderr: ${stderr}`);
    }
    console.log('Download complete');
  });
}

// Schedule the download task to run every hour
cron.schedule('0 * * * *', downloadContent);

// Run the download task immediately on server start
downloadContent();

// Endpoint to list downloaded files
app.get('/downloads', (req, res) => {
  fs.readdir(dateDir, (err, profiles) => {
    if (err) {
      return res.status(500).json({ error: err.message });
    }
    const allowedExtensions = ['.mp4', '.jpg', '.jpeg'];
    const fileList = profiles.flatMap(profileDir => {
      const profilePath = path.join(dateDir, profileDir);
      return fs.readdirSync(profilePath)
        .filter(file => allowedExtensions.includes(path.extname(file).toLowerCase()))
        .map(file => {
          const filePath = path.join(profileDir, file);
          console.log('Serving file:', filePath); // Log the file path
          return filePath;
        });
    });
    res.json(fileList);
  });
});

// Serve downloaded files statically
app.use('/static', express.static(path.join(__dirname, 'downloads')));

app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}`);
});