(function($) {
  "use strict";

  var defaultOptions = {
    tagClass: function(item) {
      return "label label-info";
    },
    itemValue: function(item) {
      return item ? item.toString() : item;
    },
    itemText: function(item) {
      return this.itemValue(item);
    },
    itemTitle: function(item) {
      return null;
    },
    freeInput: true,
    addOnBlur: true,
    maxTags: undefined,
    maxChars: undefined,
    confirmKeys: [13, 44],
    delimiter: ",",
    delimiterRegex: null,
    cancelConfirmKeysOnEmpty: true,
    onTagExists: function(item, $tag) {
      $tag.hide().fadeIn();
    },
    trimValue: false,
    allowDuplicates: false,
  };

  /**
   * Constructor function
   */
  function TagsInput(element, options) {
    this.itemsArray = [];

    this.$element = $(element);
    this.$element.hide();

    this.isSelect = element.tagName === "SELECT";
    this.multiple = this.isSelect && element.hasAttribute("multiple");
    this.objectItems = options && options.itemValue;
    this.placeholderText = element.hasAttribute("placeholder")
      ? this.$element.attr("placeholder")
      : "";
    this.inputSize = Math.max(1, this.placeholderText.length);

    this.$container = $('<div class="bootstrap-tagsinput"></div>');
    this.$input = $(
      '<input type="text" placeholder="' + this.placeholderText + '"/>'
    ).appendTo(this.$container);

    this.$element.before(this.$container);

    this.build(options);
  }

  TagsInput.prototype = {
    constructor: TagsInput,

    /**
     * Adds the given item as a new tag. Pass true to dontPushVal to prevent
     * updating the elements val()
     */
    add: function(item, dontPushVal, options) {
      var self = this;

      if (
        self.options.maxTags &&
        self.itemsArray.length >= self.options.maxTags
      )
        return;

      // Ignore falsey values, except false
      if (item !== false && !item) return;

      // Trim value
      if (typeof item === "string" && self.options.trimValue) {
        item = $.trim(item);
      }

      // Throw an error when trying to add an object while the itemValue option was not set
      if (typeof item === "object" && !self.objectItems)
        throw "Can't add objects when itemValue option is not set";

      // Ignore strings only containg whitespace
      if (item.toString().match(/^\s*$/)) return;

      // If SELECT but not multiple, remove current tag
      if (self.isSelect && !self.multiple && self.itemsArray.length > 0)
        self.remove(self.itemsArray[0]);

      if (typeof item === "string" && this.$element[0].tagName === "INPUT") {
        var delimiter = self.options.delimiterRegex
          ? self.options.delimiterRegex
          : self.options.delimiter;
        var items = item.split(delimiter);
        if (items.length > 1) {
          for (var i = 0; i < items.length; i++) {
            this.add(items[i], true);
          }

          if (!dontPushVal) self.pushVal();
          return;
        }
      }

      var itemValue = self.options.itemValue(item),
        itemText = self.options.itemText(item),
        tagClass = self.options.tagClass(item),
        itemTitle = self.options.itemTitle(item);

      // Ignore items allready added
      var existing = $.grep(self.itemsArray, function(item) {
        return self.options.itemValue(item) === itemValue;
      })[0];
      if (existing && !self.options.allowDuplicates) {
        // Invoke onTagExists
        if (self.options.onTagExists) {
          var $existingTag = $(".tag", self.$container).filter(function() {
            return $(this).data("item") === existing;
          });
          self.options.onTagExists(item, $existingTag);
        }
        return;
      }

      // if length greater than limit
      if (
        self.items().toString().length + item.length + 1 >
        self.options.maxInputLength
      )
        return;

      // raise beforeItemAdd arg
      var beforeItemAddEvent = $.Event("beforeItemAdd", {
        item: item,
        cancel: false,
        options: options,
      });
      self.$element.trigger(beforeItemAddEvent);
      if (beforeItemAddEvent.cancel) return;

      // register item in internal array and map
      self.itemsArray.push(item);

      // add a tag element

      var $tag = $(
        '<span class="tag ' +
          htmlEncode(tagClass) +
          (itemTitle !== null ? '" title="' + itemTitle : "") +
          '">' +
          htmlEncode(itemText) +
          '<span data-role="remove"></span></span>'
      );
      $tag.data("item", item);
      self.findInputWrapper().before($tag);
      $tag.after(" ");

      // add <option /> if item represents a value not present in one of the <select />'s options
      if (
        self.isSelect &&
        !$(
          'option[value="' + encodeURIComponent(itemValue) + '"]',
          self.$element
        )[0]
      ) {
        var $option = $(
          "<option selected>" + htmlEncode(itemText) + "</option>"
        );
        $option.data("item", item);
        $option.attr("value", itemValue);
        self.$element.append($option);
      }

      if (!dontPushVal) self.pushVal();

      // Add class when reached maxTags
      if (
        self.options.maxTags === self.itemsArray.length ||
        self.items().toString().length === self.options.maxInputLength
      )
        self.$container.addClass("bootstrap-tagsinput-max");

      self.$element.trigger(
        $.Event("itemAdded", { item: item, options: options })
      );
    },

    /**
     * Removes the given item. Pass true to dontPushVal to prevent updating the
     * elements val()
     */
    remove: function(item, dontPushVal, options) {
      var self = this;

      if (self.objectItems) {
        if (typeof item === "object")
          item = $.grep(self.itemsArray, function(other) {
            return (
              self.options.itemValue(other) == self.options.itemValue(item)
            );
          });
        else
          item = $.grep(self.itemsArray, function(other) {
            return self.options.itemValue(other) == item;
          });

        item = item[item.length - 1];
      }

      if (item) {
        var beforeItemRemoveEvent = $.Event("beforeItemRemove", {
          item: item,
          cancel: false,
          options: options,
        });
        self.$element.trigger(beforeItemRemoveEvent);
        if (beforeItemRemoveEvent.cancel) return;

        $(".tag", self.$container)
          .filter(function() {
            return $(this).data("item") === item;
          })
          .remove();
        $("option", self.$element)
          .filter(function() {
            return $(this).data("item") === item;
          })
          .remove();
        if ($.inArray(item, self.itemsArray) !== -1)
          self.itemsArray.splice($.inArray(item, self.itemsArray), 1);
      }

      if (!dontPushVal) self.pushVal();

      // Remove class when reached maxTags
      if (self.options.maxTags > self.itemsArray.length)
        self.$container.removeClass("bootstrap-tagsinput-max");

      self.$element.trigger(
        $.Event("itemRemoved", { item: item, options: options })
      );
    },

    /**
     * Removes all items
     */
    removeAll: function() {
      var self = this;

      $(".tag", self.$container).remove();
      $("option", self.$element).remove();

      while (self.itemsArray.length > 0) self.itemsArray.pop();

      self.pushVal();
    },

    /**
     * Refreshes the tags so they match the text/value of their corresponding
     * item.
     */
    refresh: function() {
      var self = this;
      $(".tag", self.$container).each(function() {
        var $tag = $(this),
          item = $tag.data("item"),
          itemValue = self.options.itemValue(item),
          itemText = self.options.itemText(item),
          tagClass = self.options.tagClass(item);

        // Update tag's class and inner text
        $tag.attr("class", null);
        $tag.addClass("tag " + htmlEncode(tagClass));
        $tag.contents().filter(function() {
          return this.nodeType == 3;
        })[0].nodeValue = htmlEncode(itemText);

        if (self.isSelect) {
          var option = $("option", self.$element).filter(function() {
            return $(this).data("item") === item;
          });
          option.attr("value", itemValue);
        }
      });
    },

    /**
     * Returns the items added as tags
     */
    items: function() {
      return this.itemsArray;
    },

    /**
     * Assembly value by retrieving the value of each item, and set it on the
     * element.
     */
    pushVal: function() {
      var self = this,
        val = $.map(self.items(), function(item) {
          return self.options.itemValue(item).toString();
        });

      self.$element.val(val, true).trigger("change");
    },

    /**
     * Initializes the tags input behaviour on the element
     */
    build: function(options) {
      var self = this;

      self.options = $.extend({}, defaultOptions, options);
      // When itemValue is set, freeInput should always be false
      if (self.objectItems) self.options.freeInput = false;

      makeOptionItemFunction(self.options, "itemValue");
      makeOptionItemFunction(self.options, "itemText");
      makeOptionFunction(self.options, "tagClass");

      // Typeahead Bootstrap version 2.3.2
      if (self.options.typeahead) {
        var typeahead = self.options.typeahead || {};

        makeOptionFunction(typeahead, "source");

        self.$input.typeahead(
          $.extend({}, typeahead, {
            source: function(query, process) {
              function processItems(items) {
                var texts = [];

                for (var i = 0; i < items.length; i++) {
                  var text = self.options.itemText(items[i]);
                  map[text] = items[i];
                  texts.push(text);
                }
                process(texts);
              }

              this.map = {};
              var map = this.map,
                data = typeahead.source(query);

              if ($.isFunction(data.success)) {
                // support for Angular callbacks
                data.success(processItems);
              } else if ($.isFunction(data.then)) {
                // support for Angular promises
                data.then(processItems);
              } else {
                // support for functions and jquery promises
                $.when(data).then(processItems);
              }
            },
            updater: function(text) {
              self.add(this.map[text]);
              return this.map[text];
            },
            matcher: function(text) {
              return (
                text.toLowerCase().indexOf(this.query.trim().toLowerCase()) !==
                -1
              );
            },
            sorter: function(texts) {
              return texts.sort();
            },
            highlighter: function(text) {
              var regex = new RegExp("(" + this.query + ")", "gi");
              return text.replace(regex, "<strong>$1</strong>");
            },
          })
        );
      }

      // typeahead.js
      if (self.options.typeaheadjs) {
        var typeaheadConfig = null;
        var typeaheadDatasets = {};

        // Determine if main configurations were passed or simply a dataset
        var typeaheadjs = self.options.typeaheadjs;
        if ($.isArray(typeaheadjs)) {
          typeaheadConfig = typeaheadjs[0];
          typeaheadDatasets = typeaheadjs[1];
        } else {
          typeaheadDatasets = typeaheadjs;
        }

        self.$input.typeahead(typeaheadConfig, typeaheadDatasets).on(
          "typeahead:selected",
          $.proxy(function(obj, datum) {
            if (typeaheadDatasets.valueKey)
              self.add(datum[typeaheadDatasets.valueKey]);
            else self.add(datum);
            self.$input.typeahead("val", "");
          }, self)
        );
      }

      self.$container.on(
        "click",
        $.proxy(function(event) {
          if (!self.$element.attr("disabled")) {
            self.$input.removeAttr("disabled");
          }
          self.$input.focus();
        }, self)
      );

      if (self.options.addOnBlur && self.options.freeInput) {
        self.$input.on(
          "focusout",
          $.proxy(function(event) {
            // HACK: only process on focusout when no typeahead opened, to
            //       avoid adding the typeahead text as tag
            if (
              $(".typeahead, .twitter-typeahead", self.$container).length === 0
            ) {
              self.add(self.$input.val());
              self.$input.val("");
            }
          }, self)
        );
      }

      self.$container.on(
        "keydown",
        "input",
        $.proxy(function(event) {
          var $input = $(event.target),
            $inputWrapper = self.findInputWrapper();

          if (self.$element.attr("disabled")) {
            self.$input.attr("disabled", "disabled");
            return;
          }

          switch (event.which) {
            // BACKSPACE
            case 8:
              if (doGetCaretPosition($input[0]) === 0) {
                var prev = $inputWrapper.prev();
                if (prev.length) {
                  self.remove(prev.data("item"));
                }
              }
              break;

            // DELETE
            case 46:
              if (doGetCaretPosition($input[0]) === 0) {
                var next = $inputWrapper.next();
                if (next.length) {
                  self.remove(next.data("item"));
                }
              }
              break;

            // LEFT ARROW
            case 37:
              // Try to move the input before the previous tag
              var $prevTag = $inputWrapper.prev();
              if ($input.val().length === 0 && $prevTag[0]) {
                $prevTag.before($inputWrapper);
                $input.focus();
              }
              break;
            // RIGHT ARROW
            case 39:
              // Try to move the input after the next tag
              var $nextTag = $inputWrapper.next();
              if ($input.val().length === 0 && $nextTag[0]) {
                $nextTag.after($inputWrapper);
                $input.focus();
              }
              break;
            default:
            // ignore
          }

          // Reset internal input's size
          var textLength = $input.val().length,
            wordSpace = Math.ceil(textLength / 5),
            size = textLength + wordSpace + 1;
          $input.attr("size", Math.max(this.inputSize, $input.val().length));
        }, self)
      );

      self.$container.on(
        "keypress",
        "input",
        $.proxy(function(event) {
          var $input = $(event.target);

          if (self.$element.attr("disabled")) {
            self.$input.attr("disabled", "disabled");
            return;
          }

          var text = $input.val(),
            maxLengthReached =
              self.options.maxChars && text.length >= self.options.maxChars;
          if (
            self.options.freeInput &&
            (keyCombinationInList(event, self.options.confirmKeys) ||
              maxLengthReached)
          ) {
            // Only attempt to add a tag if there is data in the field
            if (text.length !== 0) {
              self.add(
                maxLengthReached ? text.substr(0, self.options.maxChars) : text
              );
              $input.val("");
            }

            // If the field is empty, let the event triggered fire as usual
            if (self.options.cancelConfirmKeysOnEmpty === false) {
              event.preventDefault();
            }
          }

          // Reset internal input's size
          var textLength = $input.val().length,
            wordSpace = Math.ceil(textLength / 5),
            size = textLength + wordSpace + 1;
          $input.attr("size", Math.max(this.inputSize, $input.val().length));
        }, self)
      );

      // Remove icon clicked
      self.$container.on(
        "click",
        "[data-role=remove]",
        $.proxy(function(event) {
          if (self.$element.attr("disabled")) {
            return;
          }
          self.remove(
            $(event.target)
              .closest(".tag")
              .data("item")
          );
        }, self)
      );

      // Only add existing value as tags when using strings as tags
      if (self.options.itemValue === defaultOptions.itemValue) {
        if (self.$element[0].tagName === "INPUT") {
          self.add(self.$element.val());
        } else {
          $("option", self.$element).each(function() {
            self.add($(this).attr("value"), true);
          });
        }
      }
    },

    /**
     * Removes all tagsinput behaviour and unregsiter all event handlers
     */
    destroy: function() {
      var self = this;

      // Unbind events
      self.$container.off("keypress", "input");
      self.$container.off("click", "[role=remove]");

      self.$container.remove();
      self.$element.removeData("tagsinput");
      self.$element.show();
    },

    /**
     * Sets focus on the tagsinput
     */
    focus: function() {
      this.$input.focus();
    },

    /**
     * Returns the internal input element
     */
    input: function() {
      return this.$input;
    },

    /**
     * Returns the element which is wrapped around the internal input. This
     * is normally the $container, but typeahead.js moves the $input element.
     */
    findInputWrapper: function() {
      var elt = this.$input[0],
        container = this.$container[0];
      while (elt && elt.parentNode !== container) elt = elt.parentNode;

      return $(elt);
    },
  };

  /**
   * Register JQuery plugin
   */
  $.fn.tagsinput = function(arg1, arg2, arg3) {
    var results = [];

    this.each(function() {
      var tagsinput = $(this).data("tagsinput");
      // Initialize a new tags input
      if (!tagsinput) {
        tagsinput = new TagsInput(this, arg1);
        $(this).data("tagsinput", tagsinput);
        results.push(tagsinput);

        if (this.tagName === "SELECT") {
          $("option", $(this)).attr("selected", "selected");
        }

        // Init tags from $(this).val()
        $(this).val($(this).val());
      } else if (!arg1 && !arg2) {
        // tagsinput already exists
        // no function, trying to init
        results.push(tagsinput);
      } else if (tagsinput[arg1] !== undefined) {
        // Invoke function on existing tags input
        if (tagsinput[arg1].length === 3 && arg3 !== undefined) {
          var retVal = tagsinput[arg1](arg2, null, arg3);
        } else {
          var retVal = tagsinput[arg1](arg2);
        }
        if (retVal !== undefined) results.push(retVal);
      }
    });

    if (typeof arg1 == "string") {
      // Return the results from the invoked function calls
      return results.length > 1 ? results : results[0];
    } else {
      return results;
    }
  };

  $.fn.tagsinput.Constructor = TagsInput;

  /**
   * Most options support both a string or number as well as a function as
   * option value. This function makes sure that the option with the given
   * key in the given options is wrapped in a function
   */
  function makeOptionItemFunction(options, key) {
    if (typeof options[key] !== "function") {
      var propertyName = options[key];
      options[key] = function(item) {
        return item[propertyName];
      };
    }
  }
  function makeOptionFunction(options, key) {
    if (typeof options[key] !== "function") {
      var value = options[key];
      options[key] = function() {
        return value;
      };
    }
  }
  /**
   * HtmlEncodes the given value
   */
  var htmlEncodeContainer = $("<div />");
  function htmlEncode(value) {
    if (value) {
      return htmlEncodeContainer.text(value).html();
    } else {
      return "";
    }
  }

  /**
   * Returns the position of the caret in the given input field
   * http://flightschool.acylt.com/devnotes/caret-position-woes/
   */
  function doGetCaretPosition(oField) {
    var iCaretPos = 0;
    if (document.selection) {
      oField.focus();
      var oSel = document.selection.createRange();
      oSel.moveStart("character", -oField.value.length);
      iCaretPos = oSel.text.length;
    } else if (oField.selectionStart || oField.selectionStart == "0") {
      iCaretPos = oField.selectionStart;
    }
    return iCaretPos;
  }

  /**
    * Returns boolean indicates whether user has pressed an expected key combination.
    * @param object keyPressEvent: JavaScript event object, refer
    *     http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
    * @param object lookupList: expected key combinations, as in:
    *     [13, {which: 188, shiftKey: true}]
    */
  function keyCombinationInList(keyPressEvent, lookupList) {
    var found = false;
    $.each(lookupList, function(index, keyCombination) {
      if (
        typeof keyCombination === "number" &&
        keyPressEvent.which === keyCombination
      ) {
        found = true;
        return false;
      }

      if (keyPressEvent.which === keyCombination.which) {
        var alt =
            !keyCombination.hasOwnProperty("altKey") ||
            keyPressEvent.altKey === keyCombination.altKey,
          shift =
            !keyCombination.hasOwnProperty("shiftKey") ||
            keyPressEvent.shiftKey === keyCombination.shiftKey,
          ctrl =
            !keyCombination.hasOwnProperty("ctrlKey") ||
            keyPressEvent.ctrlKey === keyCombination.ctrlKey;
        if (alt && shift && ctrl) {
          found = true;
          return false;
        }
      }
    });

    return found;
  }

  /**
   * Initialize tagsinput behaviour on inputs and selects which have
   * data-role=tagsinput
   */
  $(function() {
    $(
      "input[data-role=tagsinput], select[multiple][data-role=tagsinput]"
    ).tagsinput();
  });
})(window.jQuery);
