/**
 * @namespace SearchHead
 * */
var SearchHead = (function (XE, $) {
  /** @private */
  var _this
  /** @private */
  var _data = {}
  /** @private */
  var _createMenuUrl
  /** @private */
  var _$parent = $()
  /** @private */
  var _searchData = []
  /** @private */
  var _suggestionData = []
  /** @private */
  var _focus = {
    currentIndex: -1,
    status: 'close'
  }

  return {
    /**
     * 사이트맵 검색 UI를 초기화한다.
     * @memberof SearchHead
     * @param {element} $parent
     * @param {object} data
     * @param {string} createMenuUrl
     * */
    init: function ($parent, data, createMenuUrl) {
      _this = this
      _data = data
      _createMenuUrl = createMenuUrl
      _$parent = $parent

      for (var prop in data) {
        var items = data[prop].items

        this.makeSearchData(items)
      }

      this.render()
      this.cache()
      this.bindEvents()

      return this
    },
    /**
     * 기본템플릿을 리턴한다.
     * @memberof SearchHead
     * @return {string}
     * */
    getTemplate: function () {
      return [
        '<div class="pull-left">',
        '<div class="input-group search-group">',
        '<input type="text" class="form-control" aria-label="Text input with dropdown button" placeholder="Search...">',
        '<button class="btn-link btnSearch"><i class="xi-search"></i><span class="sr-only">검색</span></button>',
        '<div class="search-list"></div>',
        '</div>',
        '</div>',
        '<div class="pull-right">',
        '<a href="' + _createMenuUrl + '" class="btn btn-primary pull-right">',
        '<i class="xi-plus"></i>',
        XE.Lang.trans('xe::addMenu'),
        '</a>',
        '</div>'
      ].join('\n')
    },
    /**
     * 화면에 렌더링한다.
     * @memberof SearchHead
     * @param {element} $parent
     * */
    render: function ($parent) {
      _$parent.append(_this.getTemplate())
    },
    /**
     * jquery element를 캐싱한다.
     * @memberof SearchHead
     * */
    cache: function () {
      this.$searchGroup = $('.search-group')
      this.$searchInput = $('.search-group > input')
      this.$btnLink = $('.btn-link')
      this.$searchList = $('.search-list')
    },
    /**
     * 이벤트 핸들러를 등록한다.
     * @memberof SearchHead
     * */
    bindEvents: function () {
      this.$searchInput.on('keyup', this.search)

      _$parent.on('click', '.btnSearch', function () {
        if (_focus.status === 'open' && _focus.currentIndex >= 0) {
          _this.moveToSelectedItem()
        }
      })

      _$parent.on('mouseenter', '.search-list li', function (e) {
        var index = _$parent.find('.search-list li').index($(this))

        _this.setFocus(index)
      })

      $(document).on('keydown', function (e) {
        var keyCode = e.keyCode

        if (_focus.status === 'open') {
          switch (keyCode) {
            case 40:
            case 38:
              e.preventDefault()

              break
          }
        }
      })

      $(document).on('keyup', function (e) {
        e.preventDefault()

        var keyCode = e.keyCode

        if (_focus.status === 'open') {
          switch (keyCode) {
            // down
            case 40:
              _this.setFocus(++_focus.currentIndex)

              break

            // up
            case 38:
              if (_focus.currentIndex != -1) {
                _this.setFocus(--_focus.currentIndex)
              }

              break

            case 13:
              if (_focus.status === 'open' && _focus.currentIndex >= 0) {
                _this.moveToSelectedItem()
              }

              break
          }
        }
      })
    },
    /**
     * 검색 데이터를 만든다.
     * @memberof SearchHead
     * @param {object} items
     * */
    makeSearchData: function (items) {
      if (items && items instanceof Object) {
        for (var prop in items) {
          var item = items[prop]

          _searchData.push({
            id: item.id,
            title: XE.Lang.trans(item.title)
          })

          _this.makeSearchData(item.items)
        }
      }
    },
    /**
     * suggestion UI를 만든다.
     * @memberof SearchHead
     * @param {object} e
     * */
    search: function (e) {
      var value = e.target.value
      var list = ''

      if (value.length >= 1) {
        var suggestion = []

        $.each(_searchData, function (idx, obj) {
          if (obj.title.indexOf(value) != -1) {
            suggestion.push(obj)
          }
        })

        _suggestionData = suggestion

        if (suggestion.length > 0) {
          list += '<ul>'

          $.each(suggestion, function (idx, obj) {
            var title = obj.title.split(value).join('<em>' + value + '</em>')

            list += '<li data-id="' + obj.id + '"><a href="#dummy">' + title + '</a></li>'
          })

          list += '</ul>'

          _this.$searchList.html(list)

          _this.toggleSuggestionByStatus('open')
        }
      } else {
        _this.toggleSuggestionByStatus('close')
      }
    },
    /**
     * status에 따른 suggestion UI를 토글링한다.
     * @memberof SearchHead
     * @param {string} status
     * */
    toggleSuggestionByStatus: function (status) {
      switch (status) {
        case 'open':
          _this.$searchGroup.addClass('open')
          _focus.status = 'open'

          break

        case 'close':
          _this.$searchGroup.removeClass('open')
          _this.$searchList.empty()
          _suggestionData = []
          _focus.currentIndex = -1
          _focus.status = 'close'

          break
      }
    },
    /**
     * 포커스를 위치한다.
     * @memberof SearchHead
     * @param {number} index
     * */
    setFocus: function (index) {
      var $list = _this.$searchList.find('li')
      var currentIndex = index

      $list.removeClass('on')

      if (index >= 0) {
        _this.$searchInput.blur()

        if (currentIndex > ($list.length - 1)) {
          currentIndex = 0
        }

        $list.eq(currentIndex).addClass('on')

        _focus.currentIndex = currentIndex
      } else {
        _this.$searchInput.focus()
      }
    },
    /**
     * 선택한 item으로 스크롤을 이동한다.
     * @memberof SearchHead
     * */
    moveToSelectedItem: function () {
      var id = _$parent.find('li.on').data('id')

      $(document).scrollTop($('#item_' + id).offset().top)
      _this.toggleSuggestionByStatus('close')
    }
  }
})(window.XE, window.jQuery)