import React from 'react';

import Component from '../component';
import {decorate, getTabProps} from '../utils/plugins';

import Tab_ from './tab';

const Tab = decorate(Tab_, 'Tab');
const isMac = /Mac/.test(navigator.userAgent);

export default class Tabs extends Component {

  template(css) {
    const {
      tabs = [],
      borderColor,
      onChange,
      onClose
    } = this.props;

    const hide = !isMac && tabs.length === 1;

    return (<nav className={css('nav', hide && 'hiddenNav')}>
      { this.props.customChildrenBefore }
      {
        tabs.length === 1 && isMac ?
          <div className={css('title')}>{tabs[0].title}</div> :
          null
      }
      {
        tabs.length > 1 ?
        [
          <ul
            key="list"
            className={css('list')}
            >
            {
              tabs.map((tab, i) => {
                const {uid, title, isActive, hasActivity} = tab;
                const props = getTabProps(tab, this.props, {
                  text: title === '' ? 'Shell' : title,
                  isFirst: i === 0,
                  isLast: tabs.length - 1 === i,
                  borderColor,
                  isActive,
                  hasActivity,
                  onSelect: onChange.bind(null, uid),
                  onClose: onClose.bind(null, uid)
                });
                return <Tab key={`tab-${uid}`} {...props}/>;
              })
            }
          </ul>,
          isMac && <div
            key="shim"
            style={{borderColor}}
            className={css('borderShim')}
            />
        ] :
        null
      }
      { this.props.customChildren }
    </nav>);
  }

  styles() {
    return {
      nav: {
        fontSize: '12px',
        height: '34px',
        lineHeight: '34px',
        verticalAlign: 'middle',
        color: '#9B9B9B',
        cursor: 'default',
        position: 'relative',
        WebkitUserSelect: 'none',
        WebkitAppRegion: isMac ? 'drag' : '',
        top: isMac ? '' : '34px'
      },

      hiddenNav: {
        display: 'none'
      },

      title: {
        textAlign: 'center',
        color: '#fff'
      },

      list: {
        maxHeight: '34px',
        display: 'flex',
        flexFlow: 'row',
        marginLeft: isMac ? 76 : 0
      },

      borderShim: {
        position: 'absolute',
        width: '76px',
        bottom: 0,
        borderColor: '#ccc',
        borderBottomStyle: 'solid',
        borderBottomWidth: '1px'
      }
    };
  }

}