(function(){
  'use strict';  
  var app = window.LS || (window.LS = {});
  var u = app.utils;

  app.uploader = {};

  app.uploader.config = function(obj){
    return function(element, isInitialized, context){
      $(element).change(function(event){
        obj.file(element.files[0]);
        if (obj.reader.readyState != 1) {
          obj.reader.readAsDataURL(obj.file()); 
        }
      });
    };
  };

  app.uploader.controller = function(args) {
    var vm = this;

    vm.docid = m.prop(args.docid);
    vm.file = m.prop();
    vm.id = args.id; 
    vm.btnId = "#upload-"+vm.id+"-btn";
    vm.modalId = "#upload-"+vm.id+"-modal";
    vm.reader = new FileReader();
    vm.contents = m.prop();
    vm.isText = m.prop(false);

    vm.reader.onloadstart = function() {
      vm.contents("");
      $(vm.modalId).find(".btn-primary").attr("disabled", true);
    };

    vm.reader.onloadend = function() {
      vm.contents(vm.reader.result);
      $(vm.modalId).find(".btn-primary").removeAttr("disabled");
    };

    vm.save = function() {
      var doc = {id: vm.docid()};
      doc.data = vm.contents().split(',')[1];
      if (vm.isText()) {
        doc.data = window.atob(doc.data);
      }
      return Doc.put(doc, vm.file().type).then(args.onSuccess, args.onFailure);
    };
    
    vm.cancel = function(){
      $("input:file").val('');
    };
    
    return vm;
  };
    
  app.uploader.view = function(ctrl, args){
    var config = {
      title: "Upload Document",
      id: "upload-"+ctrl.id+"-modal",
      action: ctrl.save,
      dismiss: ctrl.cancel,
      actionText: "Upload",
      content: m("div.upload-form", [
        m(".form-group", [
        m("label", "Document ID"),
          m("input.form-control", {
            placeholder: "Enter document ID",
            onchange: m.withAttr("value", ctrl.docid),
            size: 35,
            value: ctrl.docid()
          })
        ]),
        m(".form-group", [
        m("label", "File"),
          m("input.form-control#upload-"+ctrl.id+"-btn", {type:"file", config: app.uploader.config(ctrl)}),
          m("p.help-block", "Select a file to upload as document.")
        ]),
        m(".checkbox", [
          m("label", [
            m("input", {type: "checkbox", value: ctrl.isText(), onchange: m.withAttr("value", ctrl.isText)}), 
            "Text File"
          ]),
          m("p.help-block", "Select if the file to upload contains textual content.")
        ])
      ])
    };
    return u.modal(config);
  };
  
}());