(function () {

  "use strict";

  var debug = false;
  var pluginName = 'simpleTemplate';
  var attrPrefix = 'data-st-';
  var pluginAttr = attrPrefix + 'if';

  var lang = CKEDITOR.lang.detect('en') || 'en';
  CKEDITOR.lang[lang] = CKEDITOR.lang[lang] || {};
  CKEDITOR.lang[lang][pluginName] = {
    simpleTemplate: {
      toolbar: 'Template'
    },
    simpleTemplateRemove: {
      toolbar: 'Remove Template'
    },
    title: 'Simple Template',
    info: 'Template Properties',
    condition: 'Condition',
    comment: 'Comment',
    errEmpty: 'Condition can not be empty',
    errFormat: 'Condition is in wrong format',
    errPlaceholder: 'Unknown placeholder used in the condition'
  };

  CKEDITOR.lang[lang]['templatePlaceholder'] = {
    label: 'Template Placeholders'

  };

  debug && console.info(pluginName, 'init');

  function escapeHtml(unsafe) {
    return unsafe
      .replace(/&/g, "&")
      .replace(/</g, "&lt;")
      .replace(/>/g, "&gt;")
      .replace(/"/g, "&quot;")
      .replace(/'/g, "&#039;");
  }

  var initPlaceholderSpace = function (editor) {
    var placeholders = editor.config.templatePlaceholders;
    if (!placeholders || !placeholders.length) {
      return;
    }
    var spaceId = editor.ui.spaceId('templatePlaceholder');
    var renderSpace = function () {
      var html = 'Constants:';
      for (var i = 0, c = placeholders.length; i < c; ++i) {
        html += ' {' + escapeHtml(placeholders[i]) + '}';
      }
      return html;
    };

    editor.on('uiSpace', function (event) {
      if (event.data.space == 'bottom') {
        event.data.html = '<span id="' + spaceId + '_label" class="cke_voice_label">' + editor.lang.templatePlaceholder.label + '</span>'
        + '<span id="' + spaceId + '" class="cke_path" role="group" aria-labelledby="' + spaceId + '_label">' + renderSpace() + '</span>'
        + '<div style="clear: both;"></div>'
        + event.data.html;
      }
    });

    // Register the ui element to the focus manager.
    editor.on('uiReady', function () {
      var element = editor.ui.space('templatePlaceholder');
      element && editor.focusManager.add(element, 1);
    });
  };

  CKEDITOR.plugins.add(pluginName, {
    requires: 'dialog',
    onLoad: function () {
      debug && console.info(pluginName, 'plugin.onLoad');
      // console.log('[' + attrPrefix + 'if] {'
      //   + 'position: relative;'
      //   + 'border: 1px dashed #dfdfdf;'
      //   + '}'
      //   + '\n'
      //
      //   + '[' + attrPrefix + 'comment]::after {'
      //   + 'content: attr(data-st-comment);'
      //   + 'color: #353535;'
      //   + 'opacity: 0.5;'
      //   + 'font-size: 12px;'
      //   + 'line-height: 12px;'
      //   + 'position: absolute;'
      //   + 'right: 0;'
      //   + 'top: 0;'
      //   + '}'
      // );

    },
    init: function (editor) {
      debug && console.info(pluginName, 'plugin.init');
      var lang = editor.lang[pluginName];

      editor.addCommand('simpleTemplate', new CKEDITOR.dialogCommand('simpleTemplate'));
      editor.addCommand('simpleTemplateRemove', new CKEDITOR.simpleTemplateRemove());

      editor.ui.addButton && editor.ui.addButton('simpleTemplate', {
        label: lang.simpleTemplate.toolbar,
        command: 'simpleTemplate',
        toolbar: 'simpleTemplateBar,10',
        icon: this.path + 'icons/tpl.png'
      });
      editor.ui.addButton && editor.ui.addButton('simpleTemplateRemove', {
        label: lang.simpleTemplateRemove.toolbar,
        command: 'simpleTemplateRemove',
        toolbar: 'simpleTemplateBar,20',
        icon: this.path + 'icons/tpl-rm.png'
      });

      if (editor.addMenuItems) {
        editor.addMenuItems({
          simpleTemplate: {
            label: lang.title,
            command: 'simpleTemplate',
            group: 'simpleTemplateBar'
          }
        });
      }

      if (editor.contextMenu) {
        editor.contextMenu.addListener(function (element, selection) {
          if (element && element.hasAttribute(pluginAttr)) {
            return {simpleTemplate: CKEDITOR.TRISTATE_OFF};
          }
        });
      }

      initPlaceholderSpace(editor);
    },

    afterInit: function (editor) {
      editor.on('afterCommandExec', function (e) {
        var el;
        if (e.data.name == 'enter') {
          el = e.editor.getSelection().getStartElement();
          el.removeAttributes([pluginAttr, attrPrefix + 'comment']);
        }
      });
    }

  });



CKEDITOR.simpleTemplateRemove = function() {};
CKEDITOR.simpleTemplateRemove.prototype = {
  contextSensitive: 1,
  startDisabled: 1,

  exec: function(editor) {
    debug && console.log('simpleTemplateRemove.exec', arguments);
    var elements = editor.elementPath().elements;
    var element;
    for (var i = 0, c = elements.length; i < c; ++i) {
      if (elements[i].$.getAttribute('data-st-if')) {
        element = elements[i];
        break;
      }
    }
    if (element) {
      element.removeAttribute(pluginAttr);
      element.removeAttribute(attrPrefix + 'comment');
      this.refresh(editor, editor.elementPath());
    }
  },

  refresh: function (editor, path) {
    var elements = path.elements;
    var element;
    for (var i = 0, c = elements.length; i < c; ++i) {
      if (elements[i].$.getAttribute(pluginAttr)) {
        element = elements[i];
        break;
      }
    }

    if (element) {
      this.setState(CKEDITOR.TRISTATE_OFF);
    } else {
      this.setState(CKEDITOR.TRISTATE_DISABLED);
    }
  }
};

CKEDITOR.dialog.add('simpleTemplate', function (editor) {
  // editor.config.templatePlaceholders
  var langId = CKEDITOR.lang.detect('en') || 'en';
  var lang = CKEDITOR.lang[langId][pluginName];
  var setupValue = function (element) {
    if (element.hasAttribute(this.attr)) {
      var value = element.getAttribute(this.attr);
      this.setValue(value);
    }
  };
  var commitValue = function (element) {
    var value = CKEDITOR.tools.trim(this.getValue());
    if (value === '') {
      element.removeAttribute(this.attr);
    } else {
      element.setAttribute(this.attr, value);
    }
  };

  return {
      title: lang.title,
      minWidth: 350,
      minHeight: 150,
      contents: [
        {
          id: 'info',
          label: lang.info,
          title: lang.info,
          elements: [
            {
              id: 'comment',
              attr: attrPrefix + 'comment',
              type: 'text',
              label: lang.comment,
              setup: setupValue,
              commit: commitValue
            },
            {
              id: 'if',
              attr: attrPrefix + 'if',
              type: 'text',
              label: lang.condition,
              required: true,
              setup: setupValue,
              commit: commitValue,
              validate: function () {
                var value = this.getValue(), match, err;
                if (true !== (err = CKEDITOR.dialog.validate.notEmpty(lang.errEmpty).apply(this))) {
                  return err;
                }

                if (null == (match = value.match(/^!?(\w+)$/i))) {
                  return lang.errFormat;
                }

                if (editor.config.templatePlaceholders && -1 === CKEDITOR.tools.indexOf(editor.config.templatePlaceholders, match[1])) {
                  return lang.errPlaceholder;
                }

                return true;
              }
            }
          ]
        }
      ],

      onShow: function() {
        debug && console.log('dialog.simpleTemplate onShow', this, arguments);
        var editor = this.getParentEditor(),
          elements = editor.elementPath().elements,
          element;

        for (var i = 0, c = elements.length; i < c; ++i) {
          if (elements[i].hasAttribute('data-st-if')) {
            element = elements[i];
            break;
          }
        }

        if (element) {
          editor.getSelection().selectElement(element);
        } else {
          element = editor.getSelection().getSelectedElement();
        }

        if (element) this.setupContent(element);
      },

      onOk: function() {
        debug && console.log('dialog.simpleTemplate onOk', this, arguments);          
        var editor = this.getParentEditor(),
          elements = editor.elementPath().elements,
          element;

        for (var i = 0, c = elements.length; i < c; ++i) {
          if (elements[i].hasAttribute('data-st-if')) {
            element = elements[i];
            break;
          }
        }
        if (!element) {
          element = editor.getSelection().getSelectedElement() || editor.getSelection().getStartElement();
        }

        if (element) this.commitContent(element);
      },

     onFocus: function() {
        debug && console.log('dialog.simpleTemplate onFocus', this, arguments);
        var condition = this.getContentElement('info', 'condition');
        if (condition) {
          condition.select();
        }
      }

  };
});


})();