function solve() {
    return function (selector, initialSuggestions) {
        var element = document.querySelector(selector);

        var liTemplate = document.createElement('li');
        liTemplate.className = 'suggestion';
        var liTemplateLink = document.createElement('a');
        liTemplateLink.className = 'suggestion-link';
        liTemplateLink.href = '#';
        var suggestionsList = document.getElementsByClassName('suggestions-list')[0];



        if (arguments.length > 1) {

            var initialSuggestionsMap = {};
            initialSuggestions.forEach(function (x) {
                if (!initialSuggestionsMap[x.toLowerCase()]) {
                    if (typeof x !== 'string' || x === '') {
                        return;
                    }
                    var liElement = liTemplate.cloneNode();
                    liElement.style.display = 'none';
                    var aElement = liTemplateLink.cloneNode();

                    aElement.innerHTML = x;
                    liElement.appendChild(aElement);


                    suggestionsList.appendChild(liElement);
                    initialSuggestionsMap[x.toLowerCase()] = true;
                }

            });

        }


        var input = document.getElementsByClassName('tb-pattern')[0];
        input.addEventListener('input', function () {
            var suggestions = document.getElementsByClassName('suggestion');
            var suggestionLinks = document.getElementsByClassName('suggestion-link');
            var pattern = input.value;

            for (var i = 0, len = suggestionLinks.length; i < len; i += 1) {
                if (suggestionLinks[i].innerHTML.toLowerCase().indexOf(pattern.toLowerCase()) < 0 || pattern === '') {
                    suggestions[i].style.display = 'none';
                } else {
                    suggestions[i].style.display = '';
                }
            }

        });

        var addButton = document.getElementsByClassName('btn-add')[0];
        addButton.addEventListener('click', function () {
            var liElement = liTemplate.cloneNode();
            var aElement = liTemplateLink.cloneNode();
            liElement.style.display = 'none';
            aElement.innerHTML = input.value;
            liElement.appendChild(aElement);

            input.value = '';

            suggestionsList.appendChild(liElement);
        });

        var suggestions = document.getElementsByClassName('suggestion');

        for (var i = 0, len = suggestions.length; i < len; i += 1) {
            suggestions[i].addEventListener('click', function () {
                var text = this.firstChild.innerHTML;
                input.value = text;

            });
        }
    };
}