;(function () {
    var template = '<div class="datepicker--time">' +
        '<div class="datepicker--time-current">' +
        '   <span class="datepicker--time-current-hours">#{hourValue}</span>' +
        '   <span class="datepicker--time-current-colon">:</span>' +
        '   <span class="datepicker--time-current-minutes">#{minValue}</span>' +
        '</div>' +
        '<div class="datepicker--time-sliders">' +
        '   <div class="datepicker--time-row">' +
        '      <input type="range" name="hours" value="#{hourValue}" min="#{hourMin}" max="#{hourMax}" step="#{hourStep}"/>' +
        '   </div>' +
        '   <div class="datepicker--time-row">' +
        '      <input type="range" name="minutes" value="#{minValue}" min="#{minMin}" max="#{minMax}" step="#{minStep}"/>' +
        '   </div>' +
        '</div>' +
        '</div>',
        datepicker = $.fn.datepicker,
        dp = datepicker.Constructor;

    datepicker.Timepicker = function (inst, opts) {
        this.d = inst;
        this.opts = opts;

        this.init();
    };

    datepicker.Timepicker.prototype = {
        init: function () {
            var input = 'input';
            this._setTime(this.d.date);
            this._buildHTML();

            if (navigator.userAgent.match(/trident/gi)) {
                input = 'change';
            }

            this.d.$el.on('selectDate', this._onSelectDate.bind(this));
            this.$ranges.on(input, this._onChangeRange.bind(this));
            this.$ranges.on('mouseup', this._onMouseUpRange.bind(this));
            this.$ranges.on('mousemove focus ', this._onMouseEnterRange.bind(this));
            this.$ranges.on('mouseout blur', this._onMouseOutRange.bind(this));
        },

        _setTime: function (date) {
            var _date = dp.getParsedDate(date);

            this._handleDate(date);
            this.hours = _date.hours < this.minHours ? this.minHours : _date.hours;
            this.minutes = _date.minutes < this.minMinutes ? this.minMinutes : _date.minutes;
        },

        _setMinTimeFromDate: function (date) {
            this.minHours = date.getHours();
            this.minMinutes = date.getMinutes();
        },

        _setMaxTimeFromDate: function (date) {
            this.maxHours = date.getHours();
            this.maxMinutes = date.getMinutes();
        },

        _setDefaultMinMaxTime: function () {
            var maxHours = 23,
                maxMinutes = 59,
                opts = this.opts;

            this.minHours = opts.minHours < 0 || opts.minHours > maxHours ? 0 : opts.minHours;
            this.minMinutes = opts.minMinutes < 0 || opts.minMinutes > maxMinutes ? 0 : opts.minMinutes;
            this.maxHours = opts.maxHours < 0 || opts.maxHours > maxHours ? maxHours : opts.maxHours;
            this.maxMinutes = opts.maxMinutes < 0 || opts.maxMinutes > maxMinutes ? maxMinutes : opts.maxMinutes;
        },

        /**
         * Looks for min/max hours/minutes and if current values
         * are out of range sets valid values.
         * @private
         */
        _validateHoursMinutes: function (date) {
            if (this.hours < this.minHours) {
                this.hours = this.minHours;
            } else if (this.hours > this.maxHours) {
                this.hours = this.maxHours;
            }

            if (this.minutes < this.minMinutes) {
                this.minutes = this.minMinutes;
            } else if (this.minutes > this.maxMinutes) {
                this.minutes = this.maxMinutes;
            }
        },

        _buildHTML: function () {
            var lz = dp.getLeadingZeroNum,
                data = {
                    hourMin: this.minHours,
                    hourMax: lz(this.maxHours),
                    hourStep: this.opts.hoursStep,
                    hourValue: lz(this.displayHours),
                    minMin: this.minMinutes,
                    minMax: lz(this.maxMinutes),
                    minStep: this.opts.minutesStep,
                    minValue: lz(this.minutes)
                },
                _template = dp.template(template, data);

            this.$timepicker = $(_template).appendTo(this.d.$datepicker);
            this.$ranges = $('[type="range"]', this.$timepicker);
            this.$hours = $('[name="hours"]', this.$timepicker);
            this.$minutes = $('[name="minutes"]', this.$timepicker);
            this.$hoursText = $('.datepicker--time-current-hours', this.$timepicker);
            this.$minutesText = $('.datepicker--time-current-minutes', this.$timepicker);

            if (this.d.ampm) {
                this.$ampm = $('<span class="datepicker--time-current-ampm">')
                    .appendTo($('.datepicker--time-current', this.$timepicker))
                    .html(this.dayPeriod);

                this.$timepicker.addClass('-am-pm-');
            }
        },

        _updateCurrentTime: function () {
            var h =  dp.getLeadingZeroNum(this.displayHours),
                m = dp.getLeadingZeroNum(this.minutes);

            this.$hoursText.html(h);
            this.$minutesText.html(m);

            if (this.d.ampm) {
                this.$ampm.html(this.dayPeriod);
            }
        },

        _updateRanges: function () {
            this.$hours.attr({
                min: this.minHours,
                max: this.maxHours
            }).val(this.hours);

            this.$minutes.attr({
                min: this.minMinutes,
                max: this.maxMinutes
            }).val(this.minutes)
        },

        /**
         * Sets minHours, minMinutes etc. from date. If date is not passed, than sets
         * values from options
         * @param [date] {object} - Date object, to get values from
         * @private
         */
        _handleDate: function (date) {
            this._setDefaultMinMaxTime();

            if (date) {
                if (dp.isSame(date, this.d.opts.minDate)) {
                    this._setMinTimeFromDate(this.d.opts.minDate);
                } else if (dp.isSame(date, this.d.opts.maxDate)) {
                    this._setMaxTimeFromDate(this.d.opts.maxDate);
                }
            }

            this._validateHoursMinutes(date);
        },

        update: function () {
            this._updateRanges();
            this._updateCurrentTime();
        },

        /**
         * Calculates valid hour value to display in text input and datepicker's body.
         * @param date {Date|Number} - date or hours
         * @returns {{hours: *, dayPeriod: string}}
         * @private
         */
        _getValidHoursFromDate: function (date) {
            var d = date,
                hours = date;

            if (date instanceof Date) {
                d = dp.getParsedDate(date);
                hours = d.hours;
            }

            var ampm = this.d.ampm,
                dayPeriod = 'am';

            if (ampm) {
                switch(true) {
                    case hours == 0:
                        hours = 12;
                        break;
                    case hours == 12:
                        dayPeriod = 'pm';
                        break;
                    case hours > 11:
                        hours = hours - 12;
                        dayPeriod = 'pm';
                        break;
                    default:
                        break;
                }
            }

            return {
                hours: hours,
                dayPeriod: dayPeriod
            }
        },

        set hours (val) {
            this._hours = val;

            var displayHours = this._getValidHoursFromDate(val);

            this.displayHours = displayHours.hours;
            this.dayPeriod = displayHours.dayPeriod;
        },

        get hours() {
            return this._hours;
        },

        //  Events
        // -------------------------------------------------

        _onChangeRange: function (e) {
            var $target = $(e.target),
                name = $target.attr('name');
            
            this.d.timepickerIsActive = true;

            this[name] = $target.val();
            this._updateCurrentTime();
            this.d._trigger('timeChange', [this.hours, this.minutes])
        },

        _onSelectDate: function (e, data) {
            this._handleDate(data);
            this.update();
        },

        _onMouseEnterRange: function (e) {
            var name = $(e.target).attr('name');
            $('.datepicker--time-current-' + name, this.$timepicker).addClass('-focus-');
        },

        _onMouseOutRange: function (e) {
            var name = $(e.target).attr('name');
            if (this.d.inFocus) return; // Prevent removing focus when mouse out of range slider
            $('.datepicker--time-current-' + name, this.$timepicker).removeClass('-focus-');
        },

        _onMouseUpRange: function (e) {
            this.d.timepickerIsActive = false;
        }
    };
})();