#!/usr/bin/env node

'use strict'

var stdin = require('get-stdin')
var eccrypto = require('eccrypto')

var command = process.argv[0]
var script = process.argv[1]
var public_key = process.argv[2]
var message = process.argv[3]

var pk, m

stdin.buffer().then(function(s) {

  if (!s.length && typeof message === 'undefined') {
    return process.stdout.write(JSON.stringify({
      error: 'public key or message not given'
    }), function() {
      process.exit(1)
    })
  }

  m = s || message

  if (!public_key) {
    return process.stdout.write(JSON.stringify({
      error: 'public key or message not given'
    }), function() {
      process.exit(1)
    })
  }

  try {
    pk = Buffer(public_key, 'hex')
  } catch (err) {
    return process.stdout.write(JSON.stringify({
      error: 'public key is not a hexadecimal string'
    }), function() {
      process.exit(1)
    })
  }

  return eccrypto.encrypt(pk, m)

}).then(function(encrypted) {
  process.stdout.write(JSON.stringify({
    iv: encrypted.iv.toString('hex'),
    ephemPublicKey: encrypted.ephemPublicKey.toString('hex'),
    ciphertext: encrypted.ciphertext.toString('hex'),
    mac: encrypted.mac.toString('hex')
  }), function() {
    process.exit(0)
  })
}).catch(function(err) {
  process.stdout.write(JSON.stringify({
    eccrypto_error: JSON.stringify(err)
  }), function() {
    process.exit(1)
  })
})