const express = require('express');
const matter = require('gray-matter');
const router = express.Router();
const { exec } = require('child_process');

let dir = process.argv[2] || '.';

router.get('/', (req, res) => {
    res.send('Welcome to our minimalist web application!')
});

router.get('/api/posts', (req, res) => {
  let page = req.query.page || 1;
  let limit = req.query.limit || 10;
  exec(`./routes/listPosts ${dir} ${page} ${limit}`, (error, stdout, stderr) => {
    if (error) {
      console.log(`error: ${error.message}`);
      return;
    }
    if (stderr) {
      console.log(`stderr: ${stderr}`);
      return;
    }
    let posts = stdout.split('\n').filter(Boolean);
    res.json(posts);
  });
});

router.get('/posts', (req, res) => {
  let page = req.query.page || 1;
  let limit = req.query.limit || 10;
  exec(`./routes/listPosts ${dir} ${page} ${limit}`, (error, stdout, stderr) => {
    if (error) {
      console.log(`error: ${error.message}`);
      return;
    }
    if (stderr) {
      console.log(`stderr: ${stderr}`);
      return;
    }
    let posts = stdout.split('\n').filter(Boolean);
    let html = '<h1>Posts List</h1><ul>';
    posts.forEach(post => {
        html += `<li><a href="/viewPost?filename=${post}">${post.replace('.yaml', '')}</a></li>`;
    });
    html += '</ul>';

    res.send(html);
  });
});

router.get('/viewPost', (req, res) => {
  let { filename } = req.query;
  exec(`./routes/viewPost --filename=${filename}`, (error, stdout, stderr) => {
    if (error) {
      console.log(`error: ${error.message}`);
      return;
    }
    if (stderr) {
      console.log(`stderr: ${stderr}`);
      return;
    }
    let post = matter(stdout)
    let { title, author, timestamp } = post.data
    let html=""

    if ( title ) {
      html += `<h1>${title}</h1>`
    }

    if ( author && timestamp ) {
      let date = new Date(parseInt(timestamp)).toLocaleString()
      html += `<header>Created by ${author} on ${date}</header>`
    }
    html += '<hr/>'
    html += `<p>${post.content}</p>`
    res.send(html);
  });
});

router.get('/api/viewPost', (req, res) => {
  let { filename } = req.query;
  exec(`./routes/viewPost --filename=${filename}`, (error, stdout, stderr) => {
    if (error) {
      console.log(`error: ${error.message}`);
      return;
    }
    if (stderr) {
      console.log(`stderr: ${stderr}`);
      return;
    }
    res.json(matter(stdout));
  });
});

/*app.listen(3000, () => {
  console.log('Server is running on port 3000');
});
*/

module.exports = router