///import core
///commands 加粗,斜体,上标,下标
///commandsName  Bold,Italic,Subscript,Superscript
///commandsTitle  加粗,加斜,下标,上标
/**
 * b u i等基础功能实现
 * @function
 * @name UM.execCommands
 * @param    {String}    cmdName    bold加粗。italic斜体。subscript上标。superscript下标。
*/
UM.plugins['basestyle'] = function(){
    var basestyles = ['bold','underline','superscript','subscript','italic','strikethrough'],
        me = this;
    //添加快捷键
    me.addshortcutkey({
        "Bold" : "ctrl+66",//^B
        "Italic" : "ctrl+73", //^I
        "Underline" : "ctrl+shift+85",//^U
        "strikeThrough" : 'ctrl+shift+83' //^s
    });
    //过滤最后的产出数据
    me.addOutputRule(function(root){
        $.each(root.getNodesByTagName('b i u strike s'),function(i,node){
            switch (node.tagName){
                case 'b':
                    node.tagName = 'strong';
                    break;
                case 'i':
                    node.tagName = 'em';
                    break;
                case 'u':
                    node.tagName = 'span';
                    node.setStyle('text-decoration','underline');
                    break;
                case 's':
                case 'strike':
                    node.tagName = 'span';
                    node.setStyle('text-decoration','line-through')
            }
        });
    });
    $.each(basestyles,function(i,cmd){
        me.commands[cmd] = {
            execCommand : function( cmdName ) {
                var rng = this.selection.getRange();
                if(rng.collapsed && this.queryCommandState(cmdName) != 1){
                    var node = this.document.createElement({
                        'bold':'strong',
                        'underline':'u',
                        'superscript':'sup',
                        'subscript':'sub',
                        'italic':'em',
                        'strikethrough':'strike'
                    }[cmdName]);
                    rng.insertNode(node).setStart(node,0).setCursor(false);
                    return true;
                }else{
                    return this.document.execCommand(cmdName)
                }

            },
            queryCommandState : function(cmdName) {
                if(browser.gecko){
                    return this.document.queryCommandState(cmdName)
                }
                var path = this.selection.getStartElementPath(),result = false;
                $.each(path,function(i,n){
                    switch (cmdName){
                        case 'bold':
                            if(n.nodeName == 'STRONG' || n.nodeName == 'B'){
                                result = 1;
                                return false;
                            }
                            break;
                        case 'underline':
                            if(n.nodeName == 'U' || n.nodeName == 'SPAN' && $(n).css('text-decoration') == 'underline'){
                                result = 1;
                                return false;
                            }
                            break;
                        case 'superscript':
                            if(n.nodeName == 'SUP'){
                                result = 1;
                                return false;
                            }
                            break;
                        case 'subscript':
                            if(n.nodeName == 'SUB'){
                                result = 1;
                                return false;
                            }
                            break;
                        case 'italic':
                            if(n.nodeName == 'EM' || n.nodeName == 'I'){
                                result = 1;
                                return false;
                            }
                            break;
                        case 'strikethrough':
                            if(n.nodeName == 'S' || n.nodeName == 'STRIKE' || n.nodeName == 'SPAN' && $(n).css('text-decoration') == 'line-through'){
                                result = 1;
                                return false;
                            }
                            break;
                    }
                })
                return result
            }
        };
    })
};