import util from '../lib/util';

export default class NavBar extends util.Emitter
{
    constructor($el)
    {
        super();

        this._style = util.evalCss(require('./NavBar.scss'));

        this._$el = $el;
        $el.html('<div class="eruda-bottom-bar"></div>');
        this._$bottomBar = $el.find('.eruda-bottom-bar');
        this._len = 0;
        this._height = 55;

        this._bindEvent();
    }
    add(name)
    {
        this._len++;
        this._$el.prepend(`<div class="eruda-nav-bar-item">${name}</div>`);
        this.resetStyle();
    }
    remove(name) 
    {
        this._len--;
        this._$el.find('.eruda-nav-bar-item').each(function () 
        {
            let $this = util.$(this);   
            if ($this.text().toLowerCase() === name.toLowerCase()) $this.remove();
        });
    }
    setHeight(height)
    {
        this._height = height;
        this.resetStyle();
    }
    setBgColor(color) 
    {
        this._$el.css('background-color', color);
    }
    activeTool(name)
    {
        let self = this;

        this._$el.find('.eruda-nav-bar-item').each(function ()
        {
            let $this = util.$(this);

            if ($this.text() === name)
            {
                $this.addClass('eruda-active');
                self._resetBottomBar();
            } else
            {
                $this.rmClass('eruda-active');
            }
        });
    }
    destroy() 
    {
        util.evalCss.remove(this._style);
        this._$el.remove();
    }
    _resetBottomBar() 
    {
        let $bottomBar = this._$bottomBar;

        let li = this._$el.find('.eruda-active').get(0);

        if (!li) return;
        
        $bottomBar.css({
            width: li.offsetWidth,
            left: li.offsetLeft
        });
    }
    resetStyle()
    {
        let height = this._height;

        this._$el.css('height', height);
        
        let $el = this._$el;

        $el.css({
            height: height
        });
        $el.find('.eruda-nav-bar-item').css({
            'height': height,
            'lineHeight': height
        });

        this._resetBottomBar();
    }
    _bindEvent()
    {
        let self = this;

        this._$el.on('click', '.eruda-nav-bar-item', function ()
        {
            self.emit('showTool', util.$(this).text());
        });
    }
}