// vim: set sw=2 ts=2 sts=2 et :
const fs = require('node:fs/promises');
const http = require('node:http');
const https = require('node:https');
const path = require('node:path');

const HANDLERS = {
  'http': http,
  'https': https,
}

async function get_token() {
  const buf = await fs.readFile(
    process.env['PAPERLESS_TOKEN_FILE'],
    'utf-8',
  );
  return buf.trimEnd();
}

async function paperless_send(filepath) {
  if (!'PAPERLESS_URL' in process.env) {
    return
  }

  const filename = path.basename(filepath);
  const boundary = `------------------------${Math.random() * 1e16}`;
  const token = await get_token();
  const options = {
    method: 'POST',
    headers: {
      'Content-Type': `multipart/form-data; boundary=${boundary}`,
      'Authorization': `Token ${token}`,
    },
  };
  const url = new URL(
    process.env['PAPERLESS_URL'] + '/api/documents/post_document/'
  );
  console.log('Uploading', filename, 'to', url.toString());
  const handler = HANDLERS[url.protocol.slice(0, -1)];
  const req = handler.request(url, options, (res) => {
    console.log('Received HTTP status code', res.statusCode, 'from Paperless');
  });

  req.on('error', (e) => {
    console.error(e);
  });

  const header = `--${boundary}\r\n` +
    `Content-Disposition: form-data; name="document"; filename="${filename}"\r\n` +
    `\r\n`
  const trailer = `\r\n--${boundary}--\r\n`
  const f = await fs.open(filepath);
  const st = await f.stat();
  const length = header.length + st.size + trailer.length;
  req.setHeader('Content-Length', length.toString());
  req.write(header)
  while (1) {
    const d = await f.read();
    if (!d.bytesRead) {
      break;
    }
    req.write(d.buffer.slice(0, d.bytesRead));
  };
  await f.close();

  req.write(trailer);
  req.end();
  console.log('Upload complete');
}

module.exports = {
  async afterScan(fileInfo) {
    if (fileInfo.name.endsWith('.pdf')) {
      await paperless_send(fileInfo.fullname);
    }
  },

  afterDevices(devices) {
    devices
      .filter(d => d.id == 'escl:https://172.30.0.234:443')
      .forEach(device => {
        device.name = 'Canon PIXMA G7020';
        device.features['-x'].limits = [0, 216];
        device.features['-y'].limits = [0, 432];
        device.features['-y'].default = 279.4;
      });
  }
}