const objectHash = require('object-hash');

const verifySignature = require('./verify-signature');
const { forum } = require('./db');

module.exports = async (req, res) => {
  const { hash } = req.params;
  console.log('read', hash);

  // Fetch content
  let data;
  try {
    data = await forum.get(req.params.hash);
  } catch (e) {
    console.log('read error:', e.message, hash);
    res.status(e.status).end();
    return;
  }

  data.embeddedData = data.embeddedData || undefined;

  const {
    authors, content, signature, embeddedData,
  } = data;

  console.log({ content, embeddedData });

  // Verify hash
  const derivedHash = objectHash({
    authors, content, signature, embeddedData,
  });
  if (derivedHash !== hash) {
    console.log('error: hash mismatch');
    res.status(500).end();
    return;
  }

  // Verify signature
  if (!verifySignature(data)) {
    console.log('error: signature verificaition failed');
    res.status(500).end();
    return;
  }

  // Return content
  res.json(data);
};