/*jshint multistr:true */

this.recline = this.recline || {};
this.recline.View = this.recline.View || {};

// Views module following classic module pattern
(function($, my) {

// ## ColumnTransform
//
// View (Dialog) for doing data transformations (on columns of data).
my.ColumnTransform = Backbone.View.extend({
  className: 'transform-column-view modal fade in',
  template: ' \
    <div class="modal-header"> \
      <a class="close" data-dismiss="modal">×</a> \
      <h3>Functional transform on column {{name}}</h3> \
    </div> \
    <div class="modal-body"> \
      <div class="grid-layout layout-tight layout-full"> \
        <table> \
        <tbody> \
        <tr> \
          <td colspan="4"> \
            <div class="grid-layout layout-tight layout-full"> \
              <table rows="4" cols="4"> \
              <tbody> \
              <tr style="vertical-align: bottom;"> \
                <td colspan="4"> \
                  Expression \
                </td> \
              </tr> \
              <tr> \
                <td colspan="3"> \
                  <div class="input-container"> \
                    <textarea class="expression-preview-code"></textarea> \
                  </div> \
                </td> \
                <td class="expression-preview-parsing-status" width="150" style="vertical-align: top;"> \
                  No syntax error. \
                </td> \
              </tr> \
              <tr> \
                <td colspan="4"> \
                  <div id="expression-preview-tabs"> \
                    <span>Preview</span> \
                    <div id="expression-preview-tabs-preview"> \
                      <div class="expression-preview-container"> \
                      </div> \
                    </div> \
                  </div> \
                </td> \
              </tr> \
              </tbody> \
              </table> \
            </div> \
          </td> \
        </tr> \
        </tbody> \
        </table> \
      </div> \
    </div> \
    <div class="modal-footer"> \
      <button class="okButton btn primary">&nbsp;&nbsp;Update All&nbsp;&nbsp;</button> \
      <button class="cancelButton btn danger">Cancel</button> \
    </div> \
  ',

  events: {
    'click .okButton': 'onSubmit',
    'keydown .expression-preview-code': 'onEditorKeydown'
  },

  initialize: function() {
    this.el = $(this.el);
  },

  render: function() {
    var htmls = $.mustache(this.template, 
      {name: this.state.currentColumn}
      );
    this.el.html(htmls);
    // Put in the basic (identity) transform script
    // TODO: put this into the template?
    var editor = this.el.find('.expression-preview-code');
    editor.val("function(doc) {\n  doc['"+ this.state.currentColumn+"'] = doc['"+ this.state.currentColumn+"'];\n  return doc;\n}");
    editor.focus().get(0).setSelectionRange(18, 18);
    editor.keydown();
  },

  onSubmit: function(e) {
    var self = this;
    var funcText = this.el.find('.expression-preview-code').val();
    var editFunc = costco.evalFunction(funcText);
    if (editFunc.errorMessage) {
      my.notify("Error with function! " + editFunc.errorMessage);
      return;
    }
    this.el.modal('hide');
    my.notify("Updating all visible docs. This could take a while...", {persist: true, loader: true});
      var docs = self.model.currentDocuments.map(function(doc) {
       return doc.toJSON();
      });
    // TODO: notify about failed docs? 
    var toUpdate = costco.mapDocs(docs, editFunc).edited;
    var totalToUpdate = toUpdate.length;
    function onCompletedUpdate() {
      totalToUpdate += -1;
      if (totalToUpdate === 0) {
        my.notify(toUpdate.length + " documents updated successfully");
        alert('WARNING: We have only updated the docs in this view. (Updating of all docs not yet implemented!)');
        self.remove();
      }
    }
    // TODO: Very inefficient as we search through all docs every time!
    _.each(toUpdate, function(editedDoc) {
      var realDoc = self.model.currentDocuments.get(editedDoc.id);
      realDoc.set(editedDoc);
      realDoc.save().then(onCompletedUpdate).fail(onCompletedUpdate);
    });
    this.el.remove();
  },

  editPreviewTemplate: ' \
    <div class="expression-preview-table-wrapper"> \
      <table class="table table-condensed"> \
      <thead> \
      <tr> \
        <th class="expression-preview-heading"> \
          before \
        </th> \
        <th class="expression-preview-heading"> \
          after \
        </th> \
      </tr> \
      </thead> \
      <tbody> \
      {{#rows}} \
      <tr> \
        <td class="expression-preview-value"> \
          {{before}} \
        </td> \
        <td class="expression-preview-value"> \
          {{after}} \
        </td> \
      </tr> \
      {{/rows}} \
      </tbody> \
      </table> \
    </div> \
  ',

  onEditorKeydown: function(e) {
    var self = this;
    // if you don't setTimeout it won't grab the latest character if you call e.target.value
    window.setTimeout( function() {
      var errors = self.el.find('.expression-preview-parsing-status');
      var editFunc = costco.evalFunction(e.target.value);
      if (!editFunc.errorMessage) {
        errors.text('No syntax error.');
        var docs = self.model.currentDocuments.map(function(doc) {
          return doc.toJSON();
        });
        var previewData = costco.previewTransform(docs, editFunc, self.state.currentColumn);
        var $el = self.el.find('.expression-preview-container');
        var templated = $.mustache(self.editPreviewTemplate, {rows: previewData.slice(0,4)});
        $el.html(templated);
      } else {
        errors.text(editFunc.errorMessage);
      }
    }, 1, true);
  }
});

})(jQuery, recline.View);