//
// print server module
//
// Neil Gershenfeld 
// (c) Massachusetts Institute of Technology 2017
// 
// This work may be reproduced, modified, distributed, performed, and 
// displayed for any purpose, but must acknowledge the mods
// project. Copyright is retained and must be preserved. The work is 
// provided as is; no warranty is provided, and users accept all 
// liability.
//
// closure
//
(function(){
//
// module globals
//
var mod = {}
//
// name
//
var name = 'WebSocket print'
//
// initialization
//
var init = function() {
   mod.address.value = '127.0.0.1'
   mod.port.value = 1234
   mod.printers.value = 'Printer not found'
   mod.socket = null
   socket_open()
   }
//
// inputs
//
var inputs = {
   file:{type:'',
      event:function(evt){
         if (evt.detail.type == 'file') {
            mod.job = evt.detail
            mod.label.nodeValue = 'send file to printer'
            mod.labelspan.style.fontWeight = 'bold'
            }
         else if (evt.detail.type == 'command') {
            mod.job = evt.detail
            mod.job.printer = mod.printers.value
            socket_send(JSON.stringify(mod.job))
            }
         }}}
//
// outputs
//
var outputs = {
   }
//
// interface
//
var interface = function(div){
   mod.div = div
   //
   // server
   //
   var a = document.createElement('a')
      a.href = './js/printserver.js'
      a.innerHTML = 'printserver:'
      a.target = '_blank'
   div.appendChild(a)
   div.appendChild(document.createElement('br'))
   div.appendChild(document.createTextNode('address: '))
   input = document.createElement('input')
      input.type = 'text'
      input.size = 10
      div.appendChild(input)
      mod.address = input
   div.appendChild(document.createElement('br'))
   div.appendChild(document.createTextNode('\u00a0\u00a0\u00a0\u00a0\u00a0port: '))
   input = document.createElement('input')
      input.type = 'text'
      input.size = 10
      div.appendChild(input)
      mod.port = input
   div.appendChild(document.createElement('br'))
   div.appendChild(document.createTextNode('\u00a0\u00a0status: '))
   input = document.createElement('input')
      input.type = 'text'
      input.size = 10
      div.appendChild(input)
      mod.status = input
   div.appendChild(document.createElement('br'))
   //
   // open/close
   //
   var btn = document.createElement('button')
      btn.style.margin = 1
      btn.appendChild(document.createTextNode('open'))
      btn.addEventListener('click',function() {
         socket_open()
         })
      div.appendChild(btn)
   var btn = document.createElement('button')
      btn.style.margin = 1
      btn.appendChild(document.createTextNode('close'))
      btn.addEventListener('click',function() {
         socket_close()
         })
      div.appendChild(btn)
   div.appendChild(document.createElement('br'))
   //
   // printer
   //
   div.appendChild(document.createTextNode('printer:'))
       div.appendChild(document.createElement('br'))
       var select = document.createElement('select')
       select.setAttribute('style', 'width:150px');
      var el = document.createElement('option')
          el.textContent = 'Printer not found'
          el.value = 'Printer not found'
          select.appendChild(el)
       div.appendChild(select)
       mod.printers = select 
   div.appendChild(document.createElement('br'))   
   var btn = document.createElement('button')
      btn.style.padding = mods.ui.padding
      btn.style.margin = 1
      var span = document.createElement('span')
         var text = document.createTextNode('waiting for file')
            mod.label = text
            span.appendChild(text)
         mod.labelspan = span
         btn.appendChild(span)
      btn.addEventListener('click',function(){
         if (mod.socket == null) {
            mod.status.value = "can't send, not open"
            }
         else if (mod.label.nodeValue == 'send file to printer') {
            mod.job.printer = mod.printers.value
            socket_send(JSON.stringify(mod.job))
            mod.label.nodeValue = 'cancel'
            }
         else if (mod.label.nodeValue == 'cancel') {
            socket_send('cancel')
            }
         })
      div.appendChild(btn)
   }
//
// local functions
//
function socket_open() {
   var url = "ws://"+mod.address.value+':'+mod.port.value
   mod.socket = new WebSocket(url)
   mod.socket.onopen = function(event) {
      mod.status.value = "socket opened"
      }
   mod.socket.onerror = function(event) {
      mod.status.value = "can not open socket"
      mod.socket = null
      }
   mod.socket.onmessage = function(event) {
      mod.status.value = event.data
      if ((event.data == 'done') || (event.data == 'cancel')
         || (event.data.slice(0,5) == 'error')) {
         mod.label.nodeValue = 'waiting for file'
         mod.labelspan.style.fontWeight = 'normal'
         }
       else if (event.data[0] === '{'){
         var printerInfo = JSON.parse(event.data)
         var printerList = printerInfo['printerList']
         if (printerList) {
            while (mod.printers.hasChildNodes()) {
               mod.printers.removeChild(mod.printers.lastChild);
               }

         for(var i = 0; i < printerList.length; i++){
            var printer = printerList[i];
            var el = document.createElement('option')
            el.textContent = printer
            el.value = printer
            mod.printers.appendChild(el)
            }
            var defaultPrinter = printerInfo['default']
            if(defaultPrinter && defaultPrinter.length>0){
               mod.printers.value = defaultPrinter
               }
            }
         }
      }
   }
function socket_close() {
   mod.socket.close()
   mod.status.value = "socket closed"
   mod.socket = null
   }
function socket_send(msg) {
   if (mod.socket != null) {
      mod.status.value = "send"
      mod.socket.send(msg)
      }
   else {
      mod.status.value = "can't send, not open"
      }
   }
//
// return values
//
return ({
   mod:mod,
   name:name,
   init:init,
   inputs:inputs,
   outputs:outputs,
   interface:interface
   })
}())