require('dotenv').config()

const io = require('socket.io-client')
const zerorpc = require('zerorpc')
const Readable = require('stream').Readable
const runner = require('./runner')

let remote, relay, rpc, rpc_connected = false

remote = io.connect(process.env.SOCKETIO_REMOTE)
remote.on('cmd', (data) => {
  console.log('cmd data', data)
  if (! data.cmd) return console.log('malformed param...?')
  console.log('got', data.cmd)
  switch (data.cmd) {
    case 'set_param':
      if (! data.payload) return
      rpc.invoke(data.cmd, data.payload.key, data.payload.value, (err, res, more) => {
        console.log('sent param, got response', res)
      })
      break
    case 'get_params':
    case 'get_last_frame':
      rpc.invoke(data.cmd, (err, res, more) => {
        console.log('got params', res)
        remote.emit('res', {
          cmd: data.cmd,
          res: res,
        })
      })
      break
    default:
      rpc.invoke('send_command', data.cmd, data.payload || null, (err, res, more) => {
        console.log('sent command', res)
        remote.emit('res', {
          cmd: data.cmd,
          res: res,
        })
      })
      break
  }
})

remote.on('system', (data) => {
  console.log('system:', data.cmd)
  switch(data.cmd) {
    case 'run_system_command':
      runner.run_system_command(data.payload, (error, stdout, stderr) => {
        remote.emit('system_res', {
          type: 'command_output',
          cmd: data.payload,
          error, stdout, stderr
        })
      })
      break
    case 'get_status':
      remote.emit('system_res', {
        type: 'relay_status',
        rpc_connected: rpc_connected,
        runner: runner.status(),
      })
      break
    default:
      remote.emit('system_res', { error: 'unknown system command' })
      break
  }
})

rpc = new zerorpc.Client()
rpc.connect('tcp://127.0.0.1:' + process.env.RPC_PORT)
rpc.on('error', function(error) {
  console.error('RPC server error:', error)
})
console.log('RPC listening on port ' + process.env.RPC_PORT)

relay = new zerorpc.Server({
  // Called when the worker starts up and is ready to receive params.
  connected: function(msg, reply) {
    reply()
    console.log('got connect from ' + msg)
    remote.emit('system_res', {
      type: 'rpc_connected',
      runner: runner.status(),
    })
    rpc_connected = true
    return true
  },

  send_frame: function(fn, meta, frame, reply) {
    reply()
    // console.log('got frame, ' + frame.length + ' bytes')
    remote.emit('frame', { fn: fn, meta: meta, frame: frame })
  },

  send_status: function(key, value, reply) {
    reply()
    remote.emit('status', { key: key, value: value })
  },

  disconnecting: function(){
    reply()
    remote.emit('system_res', {
      type: 'rpc_disconnected',
    })
    rpc_connected = false
    return true
  },
})
relay.on('error', function(error) {
  console.error('Relay server error:', error)
})
relay.bind('tcp://0.0.0.0:' + process.env.RELAY_PORT)
console.log('Relay listening on port ' + process.env.RELAY_PORT)

rpc.invoke('ping', (err, res, more) => {
  console.log('sent ping', res)
  if (res === 'pong') {
    remote.emit('system_res', {
      type: 'rpc_connected',
      runner: runner.status()
    })
    rpc_connected = true
  } else {
    remote.emit('system_res', {
      type: 'rpc_disconnected',
    })
    rpc_connected = false
  }
})

module.exports = { relay: relay, remote: remote, }