(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global.autoComplete = factory());
}(this, (function () { 'use strict';

  function _classCallCheck(instance, Constructor) {
    if (!(instance instanceof Constructor)) {
      throw new TypeError("Cannot call a class as a function");
    }
  }

  function _defineProperties(target, props) {
    for (var i = 0; i < props.length; i++) {
      var descriptor = props[i];
      descriptor.enumerable = descriptor.enumerable || false;
      descriptor.configurable = true;
      if ("value" in descriptor) descriptor.writable = true;
      Object.defineProperty(target, descriptor.key, descriptor);
    }
  }

  function _createClass(Constructor, protoProps, staticProps) {
    if (protoProps) _defineProperties(Constructor.prototype, protoProps);
    if (staticProps) _defineProperties(Constructor, staticProps);
    return Constructor;
  }

  var dataAttribute = "data-id";
  var select = {
    resultsList: "autoComplete_list",
    result: "autoComplete_result",
    highlight: "autoComplete_highlighted",
    selectedResult: "autoComplete_selected"
  };
  var keys = {
    ENTER: 13,
    ARROW_UP: 38,
    ARROW_DOWN: 40
  };
  var getInput = function getInput(selector) {
    return typeof selector === "string" ? document.querySelector(selector) : selector();
  };
  var createResultsList = function createResultsList(renderResults) {
    var resultsList = document.createElement(renderResults.element);
    resultsList.setAttribute("id", select.resultsList);
    if (renderResults.container) {
      renderResults.container(resultsList);
    }
    renderResults.destination.insertAdjacentElement(renderResults.position, resultsList);
    return resultsList;
  };
  var highlight = function highlight(value) {
    return "<span class=".concat(select.highlight, ">").concat(value, "</span>");
  };
  var addResultsToList = function addResultsToList(resultsList, dataSrc, resultItem) {
    var fragment = document.createDocumentFragment();
    dataSrc.forEach(function (event, record) {
      var result = document.createElement(resultItem.element);
      var resultIndex = dataSrc[record].index;
      result.setAttribute(dataAttribute, resultIndex);
      result.setAttribute("class", select.result);
      resultItem.content ? resultItem.content(event, result) : result.innerHTML = event.match || event;
      fragment.appendChild(result);
    });
    resultsList.appendChild(fragment);
  };
  var clearResults = function clearResults(resultsList) {
    return resultsList.innerHTML = "";
  };
  var onSelection = function onSelection(event, field, resultsList, feedback, resultsValues, selection) {
    feedback({
      event: event,
      query: field instanceof HTMLInputElement ? field.value : field.innerHTML,
      matches: resultsValues.matches,
      results: resultsValues.list.map(function (record) {
        return record.value;
      }),
      selection: resultsValues.list.find(function (value) {
        if (event.keyCode === keys.ENTER) {
          return value.index === Number(selection.getAttribute(dataAttribute));
        } else if (event.type === "mousedown") {
          return value.index === Number(event.currentTarget.getAttribute(dataAttribute));
        }
      })
    });
    clearResults(resultsList);
  };
  var navigation = function navigation(input, resultsList, feedback, resultsValues) {
    var li = resultsList.childNodes,
        liLength = li.length - 1;
    var liSelected = undefined,
        next;
    var removeSelection = function removeSelection(direction) {
      liSelected.classList.remove(select.selectedResult);
      if (direction === 1) {
        next = liSelected.nextSibling;
      } else {
        next = liSelected.previousSibling;
      }
    };
    var highlightSelection = function highlightSelection(current) {
      liSelected = current;
      liSelected.classList.add(select.selectedResult);
    };
    input.onkeydown = function (event) {
      if (li.length > 0) {
        switch (event.keyCode) {
          case keys.ARROW_UP:
            if (liSelected) {
              removeSelection(0);
              if (next) {
                highlightSelection(next);
              } else {
                highlightSelection(li[liLength]);
              }
            } else {
              highlightSelection(li[liLength]);
            }
            break;
          case keys.ARROW_DOWN:
            if (liSelected) {
              removeSelection(1);
              if (next) {
                highlightSelection(next);
              } else {
                highlightSelection(li[0]);
              }
            } else {
              highlightSelection(li[0]);
            }
            break;
          case keys.ENTER:
            if (liSelected) {
              onSelection(event, input, resultsList, feedback, resultsValues, liSelected);
            }
        }
      }
    };
    li.forEach(function (selection) {
      selection.onmousedown = function (event) {
        return onSelection(event, input, resultsList, feedback, resultsValues);
      };
    });
  };
  var autoCompleteView = {
    getInput: getInput,
    createResultsList: createResultsList,
    highlight: highlight,
    addResultsToList: addResultsToList,
    navigation: navigation,
    clearResults: clearResults
  };

  var CustomEventPolyfill = function CustomEventPolyfill(event, params) {
    params = params || {
      bubbles: false,
      cancelable: false,
      detail: undefined
    };
    var evt = document.createEvent("CustomEvent");
    evt.initCustomEvent(event, params.bubbles, params.cancelable, params.detail);
    return evt;
  };
  CustomEventPolyfill.prototype = window.Event.prototype;
  var CustomEventWrapper = typeof window.CustomEvent === "function" && window.CustomEvent || CustomEventPolyfill;
  var initElementClosestPolyfill = function initElementClosestPolyfill() {
    if (!Element.prototype.matches) {
      Element.prototype.matches = Element.prototype.msMatchesSelector || Element.prototype.webkitMatchesSelector;
    }
    if (!Element.prototype.closest) {
      Element.prototype.closest = function (s) {
        var el = this;
        do {
          if (el.matches(s)) {
            return el;
          }
          el = el.parentElement || el.parentNode;
        } while (el !== null && el.nodeType === 1);
        return null;
      };
    }
  };
  var Polyfill = {
    CustomEventWrapper: CustomEventWrapper,
    initElementClosestPolyfill: initElementClosestPolyfill
  };

  var autoComplete =
  function () {
    function autoComplete(config) {
      _classCallCheck(this, autoComplete);
      var _config$selector = config.selector,
          selector = _config$selector === void 0 ? "#autoComplete" : _config$selector,
          _config$data = config.data,
          key = _config$data.key,
          _src = _config$data.src,
          _config$data$cache = _config$data.cache,
          cache = _config$data$cache === void 0 ? true : _config$data$cache,
          query = config.query,
          _config$trigger = config.trigger;
      _config$trigger = _config$trigger === void 0 ? {} : _config$trigger;
      var _config$trigger$event = _config$trigger.event,
          event = _config$trigger$event === void 0 ? ["input"] : _config$trigger$event,
          _config$trigger$condi = _config$trigger.condition,
          condition = _config$trigger$condi === void 0 ? false : _config$trigger$condi,
          _config$searchEngine = config.searchEngine,
          searchEngine = _config$searchEngine === void 0 ? "strict" : _config$searchEngine,
          _config$threshold = config.threshold,
          threshold = _config$threshold === void 0 ? 0 : _config$threshold,
          _config$debounce = config.debounce,
          debounce = _config$debounce === void 0 ? 0 : _config$debounce,
          _config$resultsList = config.resultsList;
      _config$resultsList = _config$resultsList === void 0 ? {} : _config$resultsList;
      var _config$resultsList$r = _config$resultsList.render,
          render = _config$resultsList$r === void 0 ? false : _config$resultsList$r,
          _config$resultsList$c = _config$resultsList.container,
          container = _config$resultsList$c === void 0 ? false : _config$resultsList$c,
          destination = _config$resultsList.destination,
          _config$resultsList$p = _config$resultsList.position,
          position = _config$resultsList$p === void 0 ? "afterend" : _config$resultsList$p,
          _config$resultsList$e = _config$resultsList.element,
          resultsListElement = _config$resultsList$e === void 0 ? "ul" : _config$resultsList$e,
          _config$resultsList$n = _config$resultsList.navigation,
          navigation = _config$resultsList$n === void 0 ? false : _config$resultsList$n,
          _config$sort = config.sort,
          sort = _config$sort === void 0 ? false : _config$sort,
          placeHolder = config.placeHolder,
          _config$maxResults = config.maxResults,
          maxResults = _config$maxResults === void 0 ? 5 : _config$maxResults,
          _config$resultItem = config.resultItem;
      _config$resultItem = _config$resultItem === void 0 ? {} : _config$resultItem;
      var _config$resultItem$co = _config$resultItem.content,
          content = _config$resultItem$co === void 0 ? false : _config$resultItem$co,
          _config$resultItem$el = _config$resultItem.element,
          resultItemElement = _config$resultItem$el === void 0 ? "li" : _config$resultItem$el,
          noResults = config.noResults,
          _config$highlight = config.highlight,
          highlight = _config$highlight === void 0 ? false : _config$highlight,
          onSelection = config.onSelection;
      var resultsListView = render ? autoCompleteView.createResultsList({
        container: container,
        destination: destination || autoCompleteView.getInput(selector),
        position: position,
        element: resultsListElement
      }) : null;
      this.selector = selector;
      this.data = {
        src: function src() {
          return typeof _src === "function" ? _src() : _src;
        },
        key: key,
        cache: cache
      };
      this.query = query;
      this.trigger = {
        event: event,
        condition: condition
      };
      this.searchEngine = searchEngine === "loose" ? "loose" : typeof searchEngine === "function" ? searchEngine : "strict";
      this.threshold = threshold;
      this.debounce = debounce;
      this.resultsList = {
        render: render,
        view: resultsListView,
        navigation: navigation
      };
      this.sort = sort;
      this.placeHolder = placeHolder;
      this.maxResults = maxResults;
      this.resultItem = {
        content: content,
        element: resultItemElement
      };
      this.noResults = noResults;
      this.highlight = highlight;
      this.onSelection = onSelection;
      this.init();
    }
    _createClass(autoComplete, [{
      key: "search",
      value: function search(query, record) {
        var recordLowerCase = record.toLowerCase();
        if (this.searchEngine === "loose") {
          query = query.replace(/ /g, "");
          var match = [];
          var searchPosition = 0;
          for (var number = 0; number < recordLowerCase.length; number++) {
            var recordChar = record[number];
            if (searchPosition < query.length && recordLowerCase[number] === query[searchPosition]) {
              recordChar = this.highlight ? autoCompleteView.highlight(recordChar) : recordChar;
              searchPosition++;
            }
            match.push(recordChar);
          }
          if (searchPosition !== query.length) {
            return false;
          }
          return match.join("");
        } else {
          if (recordLowerCase.includes(query)) {
            var pattern = new RegExp("".concat(query), "i");
            query = pattern.exec(record);
            return this.highlight ? record.replace(query, autoCompleteView.highlight(query)) : record;
          }
        }
      }
    }, {
      key: "listMatchedResults",
      value: function listMatchedResults(data) {
        var _this = this;
        return new Promise(function (resolve) {
          var resList = [];
          data.filter(function (record, index) {
            var search = function search(key) {
              var recordValue = key ? record[key] : record;
              if (recordValue) {
                var match = typeof _this.searchEngine === "function" ? _this.searchEngine(_this.queryValue, recordValue) : _this.search(_this.queryValue, recordValue);
                if (match && key) {
                  resList.push({
                    key: key,
                    index: index,
                    match: match,
                    value: record
                  });
                } else if (match && !key) {
                  resList.push({
                    index: index,
                    match: match,
                    value: record
                  });
                }
              }
            };
            if (_this.data.key) {
              var _iteratorNormalCompletion = true;
              var _didIteratorError = false;
              var _iteratorError = undefined;
              try {
                for (var _iterator = _this.data.key[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
                  var key = _step.value;
                  search(key);
                }
              } catch (err) {
                _didIteratorError = true;
                _iteratorError = err;
              } finally {
                try {
                  if (!_iteratorNormalCompletion && _iterator["return"] != null) {
                    _iterator["return"]();
                  }
                } finally {
                  if (_didIteratorError) {
                    throw _iteratorError;
                  }
                }
              }
            } else {
              search();
            }
          });
          var list = _this.sort ? resList.sort(_this.sort).slice(0, _this.maxResults) : resList.slice(0, _this.maxResults);
          return resolve({
            matches: resList.length,
            list: list
          });
        });
      }
    }, {
      key: "ignite",
      value: function ignite() {
        var _this2 = this;
        var input = autoCompleteView.getInput(this.selector);
        if (this.placeHolder) {
          input.setAttribute("placeholder", this.placeHolder);
        }
        var debounce = function debounce(func, delay) {
          var inDebounce;
          return function () {
            var context = this;
            var args = arguments;
            clearTimeout(inDebounce);
            inDebounce = setTimeout(function () {
              return func.apply(context, args);
            }, delay);
          };
        };
        var exec = function exec(event) {
          var inputValue = input instanceof HTMLInputElement || input instanceof HTMLTextAreaElement ? input.value.toLowerCase() : input.innerHTML.toLowerCase();
          var queryValue = _this2.queryValue = _this2.query && _this2.query.manipulate ? _this2.query.manipulate(inputValue) : inputValue;
          var renderResultsList = _this2.resultsList.render;
          var triggerCondition = _this2.trigger.condition ? _this2.trigger.condition(queryValue) : queryValue.length > _this2.threshold && queryValue.replace(/ /g, "").length;
          var eventEmitter = function eventEmitter(event, results) {
            input.dispatchEvent(new Polyfill.CustomEventWrapper("autoComplete", {
              bubbles: true,
              detail: {
                event: event,
                input: inputValue,
                query: queryValue,
                matches: results ? results.matches : null,
                results: results ? results.list : null
              },
              cancelable: true
            }));
          };
          if (renderResultsList) {
            var resultsList = _this2.resultsList.view;
            var clearResults = autoCompleteView.clearResults(resultsList);
            if (triggerCondition) {
              _this2.listMatchedResults(_this2.dataStream, event).then(function (list) {
                eventEmitter(event, list);
                if (_this2.resultsList.render) {
                  if (list.list.length === 0 && _this2.noResults) {
                    _this2.noResults();
                  } else {
                    autoCompleteView.addResultsToList(resultsList, list.list, _this2.resultItem);
                    if (_this2.onSelection) {
                      _this2.resultsList.navigation ? _this2.resultsList.navigation(event, input, resultsList, _this2.onSelection, list) : autoCompleteView.navigation(input, resultsList, _this2.onSelection, list);
                    }
                  }
                }
              });
            } else {
              eventEmitter(event);
            }
          } else if (!renderResultsList && triggerCondition) {
            _this2.listMatchedResults(_this2.dataStream, event).then(function (list) {
              eventEmitter(event, list);
            });
          }
        };
        var run = function run(event) {
          Promise.resolve(_this2.data.cache ? _this2.dataStream : _this2.data.src()).then(function (data) {
            _this2.dataStream = data;
            exec(event);
          });
        };
        this.trigger.event.forEach(function (eventType) {
          input.addEventListener(eventType, debounce(function (event) {
            return run(event);
          }, _this2.debounce));
        });
      }
    }, {
      key: "init",
      value: function init() {
        var _this3 = this;
        if (this.data.cache) {
          Promise.resolve(this.data.src()).then(function (data) {
            _this3.dataStream = data;
            _this3.ignite();
          });
        } else {
          this.ignite();
        }
        Polyfill.initElementClosestPolyfill();
      }
    }]);
    return autoComplete;
  }();

  return autoComplete;

})));