/* =============================================================
 * bootstrap-typeahead.js v2.0.0
 * http://twitter.github.com/bootstrap/javascript.html#typeahead
 * =============================================================
 * Copyright 2012 Twitter, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============================================================ */

!function( $ ){

  "use strict"

  var Typeahead = function ( element, options ) {
    this.$element = $(element)
    this.options = $.extend({}, $.fn.typeahead.defaults, options)
    this.matcher = this.options.matcher || this.matcher
    this.sorter = this.options.sorter || this.sorter
    this.highlighter = this.options.highlighter || this.highlighter
    this.$menu = $(this.options.menu).appendTo('body')
    if (this.options.scroll)
      this.$menu.addClass('scroll');
    this.source = this.options.source
    this.onselect = this.options.onselect
    this.strings = true
    this.shown = false
    this.deferred = null
    this.listen()
  }

  Typeahead.prototype = {

    constructor: Typeahead

  , select: function (e) {
      var val = JSON.parse(this.$menu.find('.active').attr('data-value'))
        , text

      if (!this.strings) text = val[this.options.property]
      else text = val

      this.$element.val(text)

      if (typeof this.onselect == "function")
          if (false === this.onselect(val, e))
              return;

      return this.hide()
    }

  , show: function () {
      var pos = $.extend({}, this.$element.offset(), {
        height: this.$element[0].offsetHeight
      })

      this.$menu.css({
        top: pos.top + pos.height
      , left: pos.left
      })

      this.$menu.show()
      this.shown = true
      return this
    }

  , hide: function () {
      this.$menu.hide()
      this.shown = false
      return this
    }

  , fetch: function() {
      var value = this.source(this, this.query)
      if (value) this.process(value)
    }

  , lookup: function (event) {
      var that = this
        , items
        , q
        , value

      this.query = this.$element.val();
      /*Check if we have a match on the current source?? */
      if (typeof this.source == "function") {
        if (!this.options.delay) return this.fetch()
        if (this.deferred) clearTimeout(this.deferred)
        this.deferred = setTimeout(this.fetch.bind(this), this.options.delay)
      } else {
        this.process(this.source)
      }
    }

  , process: function (results) {
      var that = this
        , items
        , q

      if (results.length && typeof results[0] != "string")
          this.strings = false

      this.query = this.$element.val()

      if (this.query.length < this.options.minLength) {
        return this.shown ? this.hide() : this
      }

      items = $.grep(results, function (item) {
        if (!that.strings)
          item = item[that.options.property]

        if (that.matcher(item))
            return item
      })

      items = this.sorter(items)

      if (!items.length) {
        return this.shown ? this.hide() : this
      }

      return this.render(items.slice(0, this.options.items)).show()
    }

  , matcher: function (item) {
      return ~item.toLowerCase().indexOf(this.query.toLowerCase())
    }

  , sorter: function (items) {
      var beginswith = []
        , caseSensitive = []
        , caseInsensitive = []
        , item
        , sortby

      while (item = items.shift()) {
        if (this.strings) sortby = item
        else sortby = item[this.options.property]

        if (!sortby.toLowerCase().indexOf(this.query.toLowerCase())) beginswith.push(item)
        else if (~sortby.indexOf(this.query)) caseSensitive.push(item)
        else caseInsensitive.push(item)
      }

      return beginswith.concat(caseSensitive, caseInsensitive)
    }

  , highlighter: function (item) {
      if (!this.query)
          return item;
      var exp = this.query.replace(/[.?*+^$[\]\\(){}|-]/g, "\\$&").replace(' ', '|')
      return item.replace(new RegExp(exp, 'ig'), '<strong>$&</strong>')
    }

  , render: function (items) {
      var that = this

      items = $(items).map(function (i, item) {
        var orig = item;
        i = $(that.options.item).attr('data-value', JSON.stringify(item))
        if (!that.strings) {
            if(item[that.options.render])
                item = item[that.options.render];
            else
                item = item[that.options.property];
        }
        i.find('a').html(that.highlighter(item, orig))
        return i[0]
      })

      items.first().addClass('active')
      this.$menu.html(items)
      return this
    }

  , adjustScroll: function(next) {
      var top = this.$menu.scrollTop(),
        bottom = top + this.$menu.height(),
        pos = next.position();
      if (pos.top < 0)
        this.$menu.scrollTop(top + pos.top - 10);
      else if (next.height() + top + pos.top > bottom)
        this.$menu.scrollTop(top + pos.top - this.$menu.height() + next.height() + 10);
  }

  , next: function (event) {
      var active = this.$menu.find('.active').removeClass('active')
        , next = active.next()

      if (!next.length) {
        next = $(this.$menu.find('li')[0])
      }

      next.addClass('active')

      if (this.options.scroll) {
        this.adjustScroll(next);
      }
    }

  , prev: function (event) {
      var active = this.$menu.find('.active').removeClass('active')
        , prev = active.prev()

      if (!prev.length) {
        prev = this.$menu.find('li').last()
      }

      prev.addClass('active')

      if (this.options.scroll) {
        this.adjustScroll(prev);
      }
    }

  , listen: function () {
      this.$element
        .on('blur',     $.proxy(this.blur, this))
        .on('keypress', $.proxy(this.keypress, this))
        .on('keyup',    $.proxy(this.keyup, this))

      if (this.eventSupported('keydown')) {
        this.$element.on('keydown', $.proxy(this.keypress, this))
      }

      this.$menu
        .on('click', $.proxy(this.click, this))
        .on('mouseenter', 'li', $.proxy(this.mouseenter, this))
    }

  , eventSupported: function(eventName) {
      var isSupported = eventName in this.$element
      if (!isSupported) {
        this.$element.setAttribute(eventName, 'return;')
        isSupported = typeof this.$element[eventName] === 'function'
      }
      return isSupported
    }

  , keyup: function (e) {
      e.stopPropagation()
      e.preventDefault()

      switch(e.keyCode) {
        case 40: // down arrow
        case 38: // up arrow
          break

        case 9: // tab
        case 13: // enter
          if (!this.shown) return
          this.select(e)
          break

        case 27: // escape
          this.hide()
          break

        default:
          this.lookup()
      }

  }

  , keypress: function (e) {
      e.stopPropagation()
      if (!this.shown) return

      switch(e.keyCode) {
        case 9: // tab
        case 13: // enter
        case 27: // escape
          e.preventDefault()
          break

        case 38: // up arrow
          e.preventDefault()
          this.prev()
          break

        case 40: // down arrow
          e.preventDefault()
          this.next()
          break
      }
    }

  , blur: function (e) {
      var that = this
      e.stopPropagation()
      e.preventDefault()
      setTimeout(function () { that.hide() }, 150)
    }

  , click: function (e) {
      e.stopPropagation()
      e.preventDefault()
      this.select(e)
    }

  , mouseenter: function (e) {
      this.$menu.find('.active').removeClass('active')
      $(e.currentTarget).addClass('active')
    }

  , visible: function() {
      return this.shown;
    }

  }


  /* TYPEAHEAD PLUGIN DEFINITION
   * =========================== */

  $.fn.typeahead = function ( option ) {
    return this.each(function () {
      var $this = $(this)
        , data = $this.data('typeahead')
        , options = typeof option == 'object' && option
      if (!data) $this.data('typeahead', (data = new Typeahead(this, options)))
      if (typeof option == 'string') data[option]()
    })
  }

  $.fn.typeahead.defaults = {
    source: []
  , items: 8
  , menu: '<ul class="typeahead dropdown-menu"></ul>'
  , item: '<li><a href="#"></a></li>'
  , onselect: null
  , property: 'value'
  , render: 'info'
  , minLength: 1
  , scroll: false
  , delay: 200
  }

  $.fn.typeahead.Constructor = Typeahead


 /* TYPEAHEAD DATA-API
  * ================== */

  $(function () {
    $('body').on('focus.typeahead.data-api', '[data-provide="typeahead"]', function (e) {
      var $this = $(this)
      if ($this.data('typeahead')) return
      e.preventDefault()
      $this.typeahead($this.data())
    })
  })

}( window.jQuery );
