/**
* CkEditor autogrow plugin
* 
* @version 0.9.6
*
* @author Alexander Makarov
* @author Eugenia Makarova
*
* @link http://rmcreative.ru/
*
*/
(function () {
    var CKAutoGrow = {
        editor: null,
        wrapper: null,

        check: function () {
            if (!CKAutoGrow.editor.document) return;
            if (CKAutoGrow.editor.container.getChild(0).hasClass('cke_maximized')) return;

            var newHeight = CKAutoGrow.getHeight();
            newHeight = CKAutoGrow.getEffectiveHeight(newHeight);

            if (CKAutoGrow.wrapper || (CKAutoGrow.wrapper = document.getElementById('cke_contents_' + CKAutoGrow.editor.name))) {
                CKAutoGrow.wrapper.style.height = newHeight + "px";
            }
        },

        getEffectiveHeight: function (height) {
            var minHeight = CKAutoGrow.editor.config.minHeight ? CKAutoGrow.editor.config.minHeight : false;
            var maxHeight = CKAutoGrow.editor.config.maxHeight ? CKAutoGrow.editor.config.maxHeight : false;

            if (minHeight && height <= minHeight) {
                height = minHeight;
            }
            else if (maxHeight && height > maxHeight) {
                height = maxHeight;
            }

            else {
                // TODO: what height do we need not to show scrollbar?
                height += 54;
            }

            return height;
        },

        getHeight: function () {
            //TODO: if(CKAutoGrow.editor.document.compatMode!='CSS1Compat'){
            //ie in quirks mode → scrollHeight? 
            return CKAutoGrow.editor.document.getBody().$.clientHeight;
        },

        setListeners: function (editor) {
            editor.on('contentDom', CKAutoGrow.check);
            editor.on('key', CKAutoGrow.check);
            editor.on('selectionChange', CKAutoGrow.check);
            editor.on('insertElement', function () {
                setTimeout(CKAutoGrow.check, 1000);
            });
        }
    };


    CKEDITOR.plugins.add('ckeditor_autogrow', {
        init: function (editor) {
            CKAutoGrow.editor = editor;

            // need this if we are destroying and then recreating editor on the same page
            CKAutoGrow.wrapper = document.getElementById('cke_contents_' + CKAutoGrow.editor.name);

            CKAutoGrow.setListeners(editor);
        }
    });
})();