(function($) {
    'use strict';

    var _currentSpinnerId = 0;

    function _scopedEventName(name, id) {
        return name + '.touchspin_' + id;
    }

    function _scopeEventNames(names, id) {
        return $.map(names, function(name) {
            return _scopedEventName(name, id);
        });
    }

    $.fn.TouchSpin = function(options) {

        if (options === 'destroy') {
            this.each(function() {
                var originalinput = $(this),
                    originalinput_data = originalinput.data();
                $(document).off(_scopeEventNames([
                    'mouseup',
                    'touchend',
                    'touchcancel',
                    'mousemove',
                    'touchmove',
                    'scroll',
                    'scrollstart'], originalinput_data.spinnerid).join(' '));
            });
            return;
        }

        var defaults = {
            min: 0,
            max: 100,
            initval: '',
            replacementval: '',
            step: 1,
            decimals: 0,
            stepinterval: 100,
            forcestepdivisibility: 'round', // none | floor | round | ceil
            stepintervaldelay: 500,
            verticalbuttons: false,
            verticalupclass: 'glyph-icon icon-chevron-up',
            verticaldownclass: 'glyph-icon icon-chevron-down',
            prefix: '',
            postfix: '',
            prefix_extraclass: '',
            postfix_extraclass: '',
            booster: true,
            boostat: 10,
            maxboostedstep: false,
            mousewheel: true,
            buttondown_class: 'btn btn-default',
            buttonup_class: 'btn btn-default',
            buttondown_txt: '-',
            buttonup_txt: '+'
        };

        var attributeMap = {
            min: 'min',
            max: 'max',
            initval: 'init-val',
            replacementval: 'replacement-val',
            step: 'step',
            decimals: 'decimals',
            stepinterval: 'step-interval',
            verticalbuttons: 'vertical-buttons',
            verticalupclass: 'vertical-up-class',
            verticaldownclass: 'vertical-down-class',
            forcestepdivisibility: 'force-step-divisibility',
            stepintervaldelay: 'step-interval-delay',
            prefix: 'prefix',
            postfix: 'postfix',
            prefix_extraclass: 'prefix-extra-class',
            postfix_extraclass: 'postfix-extra-class',
            booster: 'booster',
            boostat: 'boostat',
            maxboostedstep: 'max-boosted-step',
            mousewheel: 'mouse-wheel',
            buttondown_class: 'button-down-class',
            buttonup_class: 'button-up-class',
            buttondown_txt: 'button-down-txt',
            buttonup_txt: 'button-up-txt'
        };

        return this.each(function() {

            var settings,
                originalinput = $(this),
                originalinput_data = originalinput.data(),
                container,
                elements,
                value,
                downSpinTimer,
                upSpinTimer,
                downDelayTimeout,
                upDelayTimeout,
                spincount = 0,
                spinning = false;

            init();


            function init() {
                if (originalinput.data('alreadyinitialized')) {
                    return;
                }

                originalinput.data('alreadyinitialized', true);
                _currentSpinnerId += 1;
                originalinput.data('spinnerid', _currentSpinnerId);


                if (!originalinput.is('input')) {
                    console.log('Must be an input.');
                    return;
                }

                _initSettings();
                _setInitval();
                _checkValue();
                _buildHtml();
                _initElements();
                _hideEmptyPrefixPostfix();
                _bindEvents();
                _bindEventsInterface();
                elements.input.css('display', 'block');
            }

            function _setInitval() {
                if (settings.initval !== '' && originalinput.val() === '') {
                    originalinput.val(settings.initval);
                }
            }

            function changeSettings(newsettings) {
                _updateSettings(newsettings);
                _checkValue();

                var value = elements.input.val();

                if (value !== '') {
                    value = Number(elements.input.val());
                    elements.input.val(value.toFixed(settings.decimals));
                }
            }

            function _initSettings() {
                settings = $.extend({}, defaults, originalinput_data, _parseAttributes(), options);
            }

            function _parseAttributes() {
                var data = {};
                $.each(attributeMap, function(key, value) {
                    var attrName = 'bts-' + value + '';
                    if (originalinput.is('[data-' + attrName + ']')) {
                        data[key] = originalinput.data(attrName);
                    }
                });
                return data;
            }

            function _updateSettings(newsettings) {
                settings = $.extend({}, settings, newsettings);
            }

            function _buildHtml() {
                var initval = originalinput.val(),
                    parentelement = originalinput.parent();

                if (initval !== '') {
                    initval = Number(initval).toFixed(settings.decimals);
                }

                originalinput.data('initvalue', initval).val(initval);
                originalinput.addClass('form-control');

                if (parentelement.hasClass('input-group')) {
                    _advanceInputGroup(parentelement);
                }
                else {
                    _buildInputGroup();
                }
            }

            function _advanceInputGroup(parentelement) {
                parentelement.addClass('bootstrap-touchspin');

                var prev = originalinput.prev(),
                    next = originalinput.next();

                var downhtml,
                    uphtml,
                    prefixhtml = '<span class="input-group-addon bootstrap-touchspin-prefix">' + settings.prefix + '</span>',
                    postfixhtml = '<span class="input-group-addon bootstrap-touchspin-postfix">' + settings.postfix + '</span>';

                if (prev.hasClass('input-group-btn')) {
                    downhtml = '<button class="' + settings.buttondown_class + ' bootstrap-touchspin-down" type="button">' + settings.buttondown_txt + '</button>';
                    prev.append(downhtml);
                }
                else {
                    downhtml = '<span class="input-group-btn"><button class="' + settings.buttondown_class + ' bootstrap-touchspin-down" type="button">' + settings.buttondown_txt + '</button></span>';
                    $(downhtml).insertBefore(originalinput);
                }

                if (next.hasClass('input-group-btn')) {
                    uphtml = '<button class="' + settings.buttonup_class + ' bootstrap-touchspin-up" type="button">' + settings.buttonup_txt + '</button>';
                    next.prepend(uphtml);
                }
                else {
                    uphtml = '<span class="input-group-btn"><button class="' + settings.buttonup_class + ' bootstrap-touchspin-up" type="button">' + settings.buttonup_txt + '</button></span>';
                    $(uphtml).insertAfter(originalinput);
                }

                $(prefixhtml).insertBefore(originalinput);
                $(postfixhtml).insertAfter(originalinput);

                container = parentelement;
            }

            function _buildInputGroup() {
                var html;

                if (settings.verticalbuttons) {
                    html = '<div class="input-group bootstrap-touchspin"><span class="input-group-addon bootstrap-touchspin-prefix">' + settings.prefix + '</span><span class="input-group-addon bootstrap-touchspin-postfix">' + settings.postfix + '</span><span class="input-group-btn-vertical"><button class="' + settings.buttondown_class + ' bootstrap-touchspin-up" type="button"><i class="' + settings.verticalupclass + '"></i></button><button class="' + settings.buttonup_class + ' bootstrap-touchspin-down" type="button"><i class="' + settings.verticaldownclass + '"></i></button></span></div>';
                }
                else {
                    html = '<div class="input-group bootstrap-touchspin"><span class="input-group-btn"><button class="' + settings.buttondown_class + ' bootstrap-touchspin-down" type="button">' + settings.buttondown_txt + '</button></span><span class="input-group-addon bootstrap-touchspin-prefix">' + settings.prefix + '</span><span class="input-group-addon bootstrap-touchspin-postfix">' + settings.postfix + '</span><span class="input-group-btn"><button class="' + settings.buttonup_class + ' bootstrap-touchspin-up" type="button">' + settings.buttonup_txt + '</button></span></div>';
                }

                container = $(html).insertBefore(originalinput);

                $('.bootstrap-touchspin-prefix', container).after(originalinput);

                if (originalinput.hasClass('input-sm')) {
                    container.addClass('input-group-sm');
                }
                else if (originalinput.hasClass('input-lg')) {
                    container.addClass('input-group-lg');
                }
            }

            function _initElements() {
                elements = {
                    down: $('.bootstrap-touchspin-down', container),
                    up: $('.bootstrap-touchspin-up', container),
                    input: $('input', container),
                    prefix: $('.bootstrap-touchspin-prefix', container).addClass(settings.prefix_extraclass),
                    postfix: $('.bootstrap-touchspin-postfix', container).addClass(settings.postfix_extraclass)
                };
            }

            function _hideEmptyPrefixPostfix() {
                if (settings.prefix === '') {
                    elements.prefix.hide();
                }

                if (settings.postfix === '') {
                    elements.postfix.hide();
                }
            }

            function _bindEvents() {
                originalinput.on('keydown', function(ev) {
                    var code = ev.keyCode || ev.which;

                    if (code === 38) {
                        if (spinning !== 'up') {
                            upOnce();
                            startUpSpin();
                        }
                        ev.preventDefault();
                    }
                    else if (code === 40) {
                        if (spinning !== 'down') {
                            downOnce();
                            startDownSpin();
                        }
                        ev.preventDefault();
                    }
                });

                originalinput.on('keyup', function(ev) {
                    var code = ev.keyCode || ev.which;

                    if (code === 38) {
                        stopSpin();
                    }
                    else if (code === 40) {
                        stopSpin();
                    }
                });

                originalinput.on('blur', function() {
                    _checkValue();
                });

                elements.down.on('keydown', function(ev) {
                    var code = ev.keyCode || ev.which;

                    if (code === 32 || code === 13) {
                        if (spinning !== 'down') {
                            downOnce();
                            startDownSpin();
                        }
                        ev.preventDefault();
                    }
                });

                elements.down.on('keyup', function(ev) {
                    var code = ev.keyCode || ev.which;

                    if (code === 32 || code === 13) {
                        stopSpin();
                    }
                });

                elements.up.on('keydown', function(ev) {
                    var code = ev.keyCode || ev.which;

                    if (code === 32 || code === 13) {
                        if (spinning !== 'up') {
                            upOnce();
                            startUpSpin();
                        }
                        ev.preventDefault();
                    }
                });

                elements.up.on('keyup', function(ev) {
                    var code = ev.keyCode || ev.which;

                    if (code === 32 || code === 13) {
                        stopSpin();
                    }
                });

                elements.down.on('mousedown.touchspin', function(ev) {
                    elements.down.off('touchstart.touchspin');  // android 4 workaround

                    if (originalinput.is(':disabled')) {
                        return;
                    }

                    downOnce();
                    startDownSpin();

                    ev.preventDefault();
                    ev.stopPropagation();
                });

                elements.down.on('touchstart.touchspin', function(ev) {
                    elements.down.off('mousedown.touchspin');  // android 4 workaround

                    if (originalinput.is(':disabled')) {
                        return;
                    }

                    downOnce();
                    startDownSpin();

                    ev.preventDefault();
                    ev.stopPropagation();
                });

                elements.up.on('mousedown.touchspin', function(ev) {
                    elements.up.off('touchstart.touchspin');  // android 4 workaround

                    if (originalinput.is(':disabled')) {
                        return;
                    }

                    upOnce();
                    startUpSpin();

                    ev.preventDefault();
                    ev.stopPropagation();
                });

                elements.up.on('touchstart.touchspin', function(ev) {
                    elements.up.off('mousedown.touchspin');  // android 4 workaround

                    if (originalinput.is(':disabled')) {
                        return;
                    }

                    upOnce();
                    startUpSpin();

                    ev.preventDefault();
                    ev.stopPropagation();
                });

                elements.up.on('mouseout touchleave touchend touchcancel', function(ev) {
                    if (!spinning) {
                        return;
                    }

                    ev.stopPropagation();
                    stopSpin();
                });

                elements.down.on('mouseout touchleave touchend touchcancel', function(ev) {
                    if (!spinning) {
                        return;
                    }

                    ev.stopPropagation();
                    stopSpin();
                });

                elements.down.on('mousemove touchmove', function(ev) {
                    if (!spinning) {
                        return;
                    }

                    ev.stopPropagation();
                    ev.preventDefault();
                });

                elements.up.on('mousemove touchmove', function(ev) {
                    if (!spinning) {
                        return;
                    }

                    ev.stopPropagation();
                    ev.preventDefault();
                });

                $(document).on(_scopeEventNames(['mouseup', 'touchend', 'touchcancel'], _currentSpinnerId).join(' '), function(ev) {
                    if (!spinning) {
                        return;
                    }

                    ev.preventDefault();
                    stopSpin();
                });

                $(document).on(_scopeEventNames(['mousemove', 'touchmove', 'scroll', 'scrollstart'], _currentSpinnerId).join(' '), function(ev) {
                    if (!spinning) {
                        return;
                    }

                    ev.preventDefault();
                    stopSpin();
                });

                originalinput.on('mousewheel DOMMouseScroll', function(ev) {
                    if (!settings.mousewheel || !originalinput.is(':focus')) {
                        return;
                    }

                    var delta = ev.originalEvent.wheelDelta || -ev.originalEvent.deltaY || -ev.originalEvent.detail;

                    ev.stopPropagation();
                    ev.preventDefault();

                    if (delta < 0) {
                        downOnce();
                    }
                    else {
                        upOnce();
                    }
                });
            }

            function _bindEventsInterface() {
                originalinput.on('touchspin.uponce', function() {
                    stopSpin();
                    upOnce();
                });

                originalinput.on('touchspin.downonce', function() {
                    stopSpin();
                    downOnce();
                });

                originalinput.on('touchspin.startupspin', function() {
                    startUpSpin();
                });

                originalinput.on('touchspin.startdownspin', function() {
                    startDownSpin();
                });

                originalinput.on('touchspin.stopspin', function() {
                    stopSpin();
                });

                originalinput.on('touchspin.updatesettings', function(e, newsettings) {
                    changeSettings(newsettings);
                });
            }

            function _forcestepdivisibility(value) {
                switch (settings.forcestepdivisibility) {
                    case 'round':
                        return (Math.round(value / settings.step) * settings.step).toFixed(settings.decimals);
                    case 'floor':
                        return (Math.floor(value / settings.step) * settings.step).toFixed(settings.decimals);
                    case 'ceil':
                        return (Math.ceil(value / settings.step) * settings.step).toFixed(settings.decimals);
                    default:
                        return value;
                }
            }

            function _checkValue() {
                var val, parsedval, returnval;

                val = originalinput.val();

                if (val === '') {
                    if (settings.replacementval !== '') {
                        originalinput.val(settings.replacementval);
                        originalinput.trigger('change');
                    }
                    return;
                }

                if (settings.decimals > 0 && val === '.') {
                    return;
                }

                parsedval = parseFloat(val);

                if (isNaN(parsedval)) {
                    if (settings.replacementval !== '') {
                        parsedval = settings.replacementval;
                    }
                    else {
                        parsedval = 0;
                    }
                }

                returnval = parsedval;

                if (parsedval.toString() !== val) {
                    returnval = parsedval;
                }

                if (parsedval < settings.min) {
                    returnval = settings.min;
                }

                if (parsedval > settings.max) {
                    returnval = settings.max;
                }

                returnval = _forcestepdivisibility(returnval);

                if (Number(val).toString() !== returnval.toString()) {
                    originalinput.val(returnval);
                    originalinput.trigger('change');
                }
            }

            function _getBoostedStep() {
                if (!settings.booster) {
                    return settings.step;
                }
                else {
                    var boosted = Math.pow(2, Math.floor(spincount / settings.boostat)) * settings.step;

                    if (settings.maxboostedstep) {
                        if (boosted > settings.maxboostedstep) {
                            boosted = settings.maxboostedstep;
                            value = Math.round((value / boosted)) * boosted;
                        }
                    }

                    return Math.max(settings.step, boosted);
                }
            }

            function upOnce() {
                _checkValue();

                value = parseFloat(elements.input.val());
                if (isNaN(value)) {
                    value = 0;
                }

                var initvalue = value,
                    boostedstep = _getBoostedStep();

                value = value + boostedstep;

                if (value > settings.max) {
                    value = settings.max;
                    originalinput.trigger('touchspin.on.max');
                    stopSpin();
                }

                elements.input.val(Number(value).toFixed(settings.decimals));

                if (initvalue !== value) {
                    originalinput.trigger('change');
                }
            }

            function downOnce() {
                _checkValue();

                value = parseFloat(elements.input.val());
                if (isNaN(value)) {
                    value = 0;
                }

                var initvalue = value,
                    boostedstep = _getBoostedStep();

                value = value - boostedstep;

                if (value < settings.min) {
                    value = settings.min;
                    originalinput.trigger('touchspin.on.min');
                    stopSpin();
                }

                elements.input.val(value.toFixed(settings.decimals));

                if (initvalue !== value) {
                    originalinput.trigger('change');
                }
            }

            function startDownSpin() {
                stopSpin();

                spincount = 0;
                spinning = 'down';

                originalinput.trigger('touchspin.on.startspin');
                originalinput.trigger('touchspin.on.startdownspin');

                downDelayTimeout = setTimeout(function() {
                    downSpinTimer = setInterval(function() {
                        spincount++;
                        downOnce();
                    }, settings.stepinterval);
                }, settings.stepintervaldelay);
            }

            function startUpSpin() {
                stopSpin();

                spincount = 0;
                spinning = 'up';

                originalinput.trigger('touchspin.on.startspin');
                originalinput.trigger('touchspin.on.startupspin');

                upDelayTimeout = setTimeout(function() {
                    upSpinTimer = setInterval(function() {
                        spincount++;
                        upOnce();
                    }, settings.stepinterval);
                }, settings.stepintervaldelay);
            }

            function stopSpin() {
                clearTimeout(downDelayTimeout);
                clearTimeout(upDelayTimeout);
                clearInterval(downSpinTimer);
                clearInterval(upSpinTimer);

                switch (spinning) {
                    case 'up':
                        originalinput.trigger('touchspin.on.stopupspin');
                        originalinput.trigger('touchspin.on.stopspin');
                        break;
                    case 'down':
                        originalinput.trigger('touchspin.on.stopdownspin');
                        originalinput.trigger('touchspin.on.stopspin');
                        break;
                }

                spincount = 0;
                spinning = false;
            }

        });

    };

})(jQuery);