(function(global) {
  'use strict';

  // Module to handle file uploading in Steps
  global.DragNDropSteps = (function() {
    var droppedFiles = [];
    var filesValid = true;
    var totalSize = 0;

    function init(files) {
      for(var i = 0; i < files.length; i++) {
        droppedFiles.push(files[i]);
      }
      listItems();
    }

    // return the status of files if they are ready to submit
    function filesStatus() {
      return filesValid;
    }

    // loops through a list of files and display each file in a separate panel
    function listItems() {
      droppedFiles = droppedFiles.filter(Boolean);
      $('.panel-step-attachment-new').remove();
      _dragNdropAssetsOff();
      for(var i = 0; i < droppedFiles.length; i++) {
        $('#new-step-assets')
          .append(_uploadedAseetPreview(droppedFiles[i], i))
          .promise()
          .done(function() {
            _removeItemHandler(i);
          });
      }
      _validateTotalSize();
      dragNdropAssetsInit('steps');
    }

    // append the files to the form before submit
    function appendFilesToForm(ev) {
      var regex = /step\[assets_attributes\]\[[0-9]*\]\[id\]/;
      var prevEls = $('input').filter(function() {
        return this.name.match(regex);
      });
      droppedFiles = droppedFiles.filter(Boolean);
      var fd = new FormData($(ev.target).closest('form').get(0));
      for(var i = 0; i < droppedFiles.length; i++) {
        var index = i + prevEls.length;
        var name = 'step[assets_attributes][' + index + '][file]';
        fd.append(name, droppedFiles[i]);
      }
      droppedFiles = [];
      filesValid = true;
      totalSize = 0;
      _dragNdropAssetsOff();
      return fd;
    }

    function _validateFilesSize(file) {
      var maxSize = file.size/1048576;
      if(maxSize > <%= Constants::FILE_MAX_SIZE_MB %> && filesValid) {
        return "<p><%= I18n.t 'general.file.size_exceeded', file_size: Constants::FILE_MAX_SIZE_MB %></p>";
      }
      totalSize += parseInt(maxSize);
      return '';
    }

    function _validateTotalSize() {
      if(totalSize > <%= Constants::FILE_MAX_SIZE_MB %>) {
        filesValid = false;
        $.each($('.panel-step-attachment-new'), function() {
          $(this)
            .find('.panel-body')
            .append("<p class='dnd-error'><%= I18n.t('general.file.total_size', size: Constants::FILE_MAX_SIZE_MB) %></p>");
        });
      } else {
        $('.dnd-error').remove();
        filesValid = true;
      }
    }

    function _uploadedAseetPreview(asset, i) {
      var html = '<div class="panel panel-default panel-step-attachment-new">';
      html += '<div class="panel-heading">';
      html += '<span class="glyphicon glyphicon-file"></span>';
      html += '<%= I18n.t 'assets.drag_n_drop.file_label' %>';
      html += '<div class="pull-right">';
      html += '<a data-item-id="' + i + '" href="#">';
      html += '<span class="glyphicon glyphicon-remove"></span></a></div></div>';
      html += '<div class="panel-body">';
      html += '<label class="control-label">';
      html += '<%= I18n.t 'assets.drag_n_drop.file_label' %>:</label> ';
      html += truncateLongString(asset.name,
                                 <%= Constants::FILENAME_TRUNCATION_LENGTH %>);
      html += _validateFilesSize(asset);
      html += '</div></div>';
      return html;
    }

    function _removeItemHandler(id) {
      $('[data-item-id="' + id +'"]').off('click').on('click', function(e) {
        e.preventDefault();
        e.stopImmediatePropagation();
        e.stopPropagation();
        var $el = $(this);
        var index = $el.data('item-id');
        totalSize -= parseInt(droppedFiles[index]/1048576);
        droppedFiles[index] = null;
        $el.closest('.panel-step-attachment-new').remove();
        _validateTotalSize();
      });
    }

    function _dragNdropAssetsOff() {
      $('body').off('drag dragstart dragend dragover dragenter dragleave drop');
      $('.is-dragover').hide();
    }

    return Object.freeze({
      init: init,
      appendFilesToForm: appendFilesToForm,
      listItems: listItems,
      filesStatus: filesStatus
    });
  })();

  // Module to handle file uploading in Results
  global.DragNDropResults = (function() {
    var droppedFiles = [];
    var isValid = true;
    var totalSize = 0;

    function init(files) {
      var filesPresent = droppedFiles.length;
      for(var i = 0; i < files.length; i++) {
        droppedFiles.push(files[i]);
      }
      listItems(filesPresent);
    }

    // return the status of files if they are ready to submit
    function filesStatus() {
      return isValid;
    }

    // loops through a list of files and display each file in a separate panel
    function listItems(index) {
      _dragNdropAssetsOff();
      for(var i = index; i < droppedFiles.length; i++) {
          $('#new-result-assets-select')
            .after(_uploadedAseetPreview(droppedFiles[i], i))
            .promise()
            .done(function() {
              _removeItemHandler(i);
            });
      }
      _validateTotalSize();
      dragNdropAssetsInit('results');
    }

    // appent the files to the form before submit
    function _appendFilesToForm() {
      var regex = /result\[assets_attributes\]\[[0-9]*\]\[id\]/;
      var prevEls = $('input').filter(function() {
        return this.name.match(regex);
      });

      var fd = new FormData();
      var result_names = [];
      $.each($('input[rel="results[name]"]'), function() {
        result_names.push($(this).val());
      });
      result_names.reverse();
      for(var i = 0; i < droppedFiles.length; i++) {
        var index = i + prevEls.length;
        var file_name = 'results_files[' + index + ']';
        fd.append(file_name, droppedFiles[i]);
        fd.append('results_names[' + i + ']', result_names[i]);
      }
      destroyAll();
      return fd;
    }

    function _filerAndCheckFiles() {
      droppedFiles = droppedFiles.filter(Boolean);
      return (droppedFiles.length > 0);
    }

    function _validateFilesSize(file) {
      var maxSize = file.size/1048576;
      if(maxSize > <%= Constants::FILE_MAX_SIZE_MB %> && isValid) {
        return "<p><%= I18n.t 'general.file.size_exceeded', file_size: Constants::FILE_MAX_SIZE_MB %></p>";
      }
      totalSize += parseInt(maxSize);
      return '';
    }

    function _validateTotalSize() {
      if(totalSize > <%= Constants::FILE_MAX_SIZE_MB %>) {
        isValid = false;
        $.each($('.panel-result-attachment-new'), function() {
          $(this)
            .find('.panel-body')
            .append("<p class='dnd-error'><%= I18n.t('general.file.total_size', size: Constants::FILE_MAX_SIZE_MB) %></p>");
        });
      } else {
        $('.dnd-error').remove();
        isValid = true;
      }
    }

    function validateTextSize(input) {
      if(input.value.length > <%= Constants::NAME_MAX_LENGTH %>) {
        $(input).parent().find('.dnd-error').remove();
        $(input).after("<p class='dnd-error'><%= I18n.t('general.text.length_too_long', max_length: Constants::NAME_MAX_LENGTH) %></p>");
        isValid = false;
      } else {
        $(input).parent().find('.dnd-error').remove();
        isValid = true;
      }
    }

    function _uploadedAseetPreview(asset, i) {
      var html = '<div class="panel panel-default panel-result-attachment-new">';
      html += '<div class="panel-heading">';
      html += '<span class="glyphicon glyphicon-file"></span>';
      html += '<%= I18n.t 'assets.drag_n_drop.file_label' %>';
      html += '<div class="pull-right">';
      html += '<a data-item-id="' + i + '" href="#">';
      html += '<span class="glyphicon glyphicon-remove"></span></a></div></div>';
      html += '<div class="panel-body"><div class="form-group">';
      html += '<label class="control-label">Name</label>';
      html += '<input type="text" class="form-control" ';
      html += 'onChange="DragNDropResults.validateTextSize(this)"';
      html += ' rel="results[name]" name="results[name][' + i + ']">';
      html += '</div><div class="form-group"><label class="control-label">';
      html += '<%= I18n.t 'assets.drag_n_drop.file_label' %>:</label> ';
      html += truncateLongString(asset.name,
                                 <%= Constants::FILENAME_TRUNCATION_LENGTH %>);
      html += _validateFilesSize(asset);
      html += '</div></div>';
      return html;
    }

    function _removeItemHandler(id) {
      $('[data-item-id="' + id +'"]').off('click').on('click', function(e) {
        e.preventDefault();
        e.stopImmediatePropagation();
        e.stopPropagation();
        var $el = $(this);
        var index = $el.data('item-id');
        totalSize -= parseInt(droppedFiles[index]/1048576);
        droppedFiles[index] = null;
        $el.closest('.panel-result-attachment-new').remove();
        _validateTotalSize();
      });
    }

    function processResult(button) {
      if(isValid && _filerAndCheckFiles()) {
        animateSpinner();
        $.ajax({
          url: $(button).attr('data-href'),
          method: 'POST',
          data: _appendFilesToForm(),
          contentType: false,
          processData: false,
          success: function(data) {
            animateSpinner(null, false);
            $('#new-result-assets-select').parent().remove();
            $(data.html).prependTo('#results').promise().done(function() {
              $.each($('[data-container="new-reports"]').find('.result'),
                     function() {
                initFormSubmitLinks($(this));
                ResutlAssets.applyEditResultAssetCallback();
                Results.applyCollapseLinkCallBack();
                Results.toggleResultEditButtons(true);
                initPreviewModal();
                Comments.initialize();
                ResutlAssets.initNewResultAsset();
                Results.expandResult($(this));
              });

            });
            $('#results-toolbar').show();
          },
          error: function() {
            animateSpinner();
            location.reload();
          }
        })
      }
    }

    function destroyAll() {
      _dragNdropAssetsOff();
      droppedFiles = [];
      isValid = true;
      totalSize = 0;
    }

    function _dragNdropAssetsOff() {
      $('body').off('drag dragstart dragend dragover dragenter dragleave drop');
      $('.is-dragover').hide();
    }

    return Object.freeze({
      init: init,
      listItems: listItems,
      destroyAll: destroyAll,
      filesStatus: filesStatus,
      validateTextSize: validateTextSize,
      processResult: processResult
    });
  })();

  global.dragNdropAssetsInit = function(location) {
    var in_window = true;

    $('body').on('drag dragstart dragend dragover dragenter dragleave drop',
             function(e) {
      e.preventDefault();
      e.stopPropagation();
    }).on('dragover', function() {
      in_window = true;
      $('.is-dragover').show();
    }).on('dragleave', function() {
      in_window = false;
      setTimeout(function() {
        if(!in_window) {
          $('.is-dragover').hide();
        }
      }, 5000);

    }).on('drop', function(e) {
      $('.is-dragover').hide();
      var files = e.originalEvent.dataTransfer.files;
      if(location === 'steps') {
        DragNDropSteps.init(files);
      } else  {
        DragNDropResults.init(files);
      }
    });
  }

})(window);