;(function () {
    var templates = {
        days:'' +
        '<div class="datepicker--days datepicker--body">' +
        '<div class="datepicker--days-names"></div>' +
        '<div class="datepicker--cells datepicker--cells-days"></div>' +
        '</div>',
        months: '' +
        '<div class="datepicker--months datepicker--body">' +
        '<div class="datepicker--cells datepicker--cells-months"></div>' +
        '</div>',
        years: '' +
        '<div class="datepicker--years datepicker--body">' +
        '<div class="datepicker--cells datepicker--cells-years"></div>' +
        '</div>'
        },
        datepicker = $.fn.datepicker,
        dp = datepicker.Constructor;

    datepicker.Body = function (d, type, opts) {
        this.d = d;
        this.type = type;
        this.opts = opts;
        this.$el = $('');

        if (this.opts.onlyTimepicker) return;
        this.init();
    };

    datepicker.Body.prototype = {
        init: function () {
            this._buildBaseHtml();
            this._render();

            this._bindEvents();
        },

        _bindEvents: function () {
            this.$el.on('click', '.datepicker--cell', $.proxy(this._onClickCell, this));
        },

        _buildBaseHtml: function () {
            this.$el = $(templates[this.type]).appendTo(this.d.$content);
            this.$names = $('.datepicker--days-names', this.$el);
            this.$cells = $('.datepicker--cells', this.$el);
        },

        _getDayNamesHtml: function (firstDay, curDay, html, i) {
            curDay = curDay != undefined ? curDay : firstDay;
            html = html ? html : '';
            i = i != undefined ? i : 0;

            if (i > 7) return html;
            if (curDay == 7) return this._getDayNamesHtml(firstDay, 0, html, ++i);

            html += '<div class="datepicker--day-name' + (this.d.isWeekend(curDay) ? " -weekend-" : "") + '">' + this.d.loc.daysMin[curDay] + '</div>';

            return this._getDayNamesHtml(firstDay, ++curDay, html, ++i);
        },

        _getCellContents: function (date, type) {
            var classes = "datepicker--cell datepicker--cell-" + type,
                currentDate = new Date(),
                parent = this.d,
                minRange = dp.resetTime(parent.minRange),
                maxRange = dp.resetTime(parent.maxRange),
                opts = parent.opts,
                d = dp.getParsedDate(date),
                render = {},
                html = d.date;

            switch (type) {
                case 'day':
                    if (parent.isWeekend(d.day)) classes += " -weekend-";
                    if (d.month != this.d.parsedDate.month) {
                        classes += " -other-month-";
                        if (!opts.selectOtherMonths) {
                            classes += " -disabled-";
                        }
                        if (!opts.showOtherMonths) html = '';
                    }
                    break;
                case 'month':
                    html = parent.loc[parent.opts.monthsField][d.month];
                    break;
                case 'year':
                    var decade = parent.curDecade;
                    html = d.year;
                    if (d.year < decade[0] || d.year > decade[1]) {
                        classes += ' -other-decade-';
                        if (!opts.selectOtherYears) {
                            classes += " -disabled-";
                        }
                        if (!opts.showOtherYears) html = '';
                    }
                    break;
            }

            if (opts.onRenderCell) {
                render = opts.onRenderCell(date, type) || {};
                html = render.html ? render.html : html;
                classes += render.classes ? ' ' + render.classes : '';
            }

            if (opts.range) {
                if (dp.isSame(minRange, date, type)) classes += ' -range-from-';
                if (dp.isSame(maxRange, date, type)) classes += ' -range-to-';

                if (parent.selectedDates.length == 1 && parent.focused) {
                    if (
                        (dp.bigger(minRange, date) && dp.less(parent.focused, date)) ||
                        (dp.less(maxRange, date) && dp.bigger(parent.focused, date)))
                    {
                        classes += ' -in-range-'
                    }

                    if (dp.less(maxRange, date) && dp.isSame(parent.focused, date)) {
                        classes += ' -range-from-'
                    }
                    if (dp.bigger(minRange, date) && dp.isSame(parent.focused, date)) {
                        classes += ' -range-to-'
                    }

                } else if (parent.selectedDates.length == 2) {
                    if (dp.bigger(minRange, date) && dp.less(maxRange, date)) {
                        classes += ' -in-range-'
                    }
                }
            }


            if (dp.isSame(currentDate, date, type)) classes += ' -current-';
            if (parent.focused && dp.isSame(date, parent.focused, type)) classes += ' -focus-';
            if (parent._isSelected(date, type)) classes += ' -selected-';
            if (!parent._isInRange(date, type) || render.disabled) classes += ' -disabled-';

            return {
                html: html,
                classes: classes
            }
        },

        /**
         * Calculates days number to render. Generates days html and returns it.
         * @param {object} date - Date object
         * @returns {string}
         * @private
         */
        _getDaysHtml: function (date) {
            var totalMonthDays = dp.getDaysCount(date),
                firstMonthDay = new Date(date.getFullYear(), date.getMonth(), 1).getDay(),
                lastMonthDay = new Date(date.getFullYear(), date.getMonth(), totalMonthDays).getDay(),
                daysFromPevMonth = firstMonthDay - this.d.loc.firstDay,
                daysFromNextMonth = 6 - lastMonthDay + this.d.loc.firstDay;

            daysFromPevMonth = daysFromPevMonth < 0 ? daysFromPevMonth + 7 : daysFromPevMonth;
            daysFromNextMonth = daysFromNextMonth > 6 ? daysFromNextMonth - 7 : daysFromNextMonth;

            var startDayIndex = -daysFromPevMonth + 1,
                m, y,
                html = '';

            for (var i = startDayIndex, max = totalMonthDays + daysFromNextMonth; i <= max; i++) {
                y = date.getFullYear();
                m = date.getMonth();

                html += this._getDayHtml(new Date(y, m, i))
            }

            return html;
        },

        _getDayHtml: function (date) {
           var content = this._getCellContents(date, 'day');

            return '<div class="' + content.classes + '" ' +
                'data-date="' + date.getDate() + '" ' +
                'data-month="' + date.getMonth() + '" ' +
                'data-year="' + date.getFullYear() + '">' + content.html + '</div>';
        },

        /**
         * Generates months html
         * @param {object} date - date instance
         * @returns {string}
         * @private
         */
        _getMonthsHtml: function (date) {
            var html = '',
                d = dp.getParsedDate(date),
                i = 0;

            while(i < 12) {
                html += this._getMonthHtml(new Date(d.year, i));
                i++
            }

            return html;
        },

        _getMonthHtml: function (date) {
            var content = this._getCellContents(date, 'month');

            return '<div class="' + content.classes + '" data-month="' + date.getMonth() + '">' + content.html + '</div>'
        },

        _getYearsHtml: function (date) {
            var d = dp.getParsedDate(date),
                decade = dp.getDecade(date),
                firstYear = decade[0] - 1,
                html = '',
                i = firstYear;

            for (i; i <= decade[1] + 1; i++) {
                html += this._getYearHtml(new Date(i , 0));
            }

            return html;
        },

        _getYearHtml: function (date) {
            var content = this._getCellContents(date, 'year');

            return '<div class="' + content.classes + '" data-year="' + date.getFullYear() + '">' + content.html + '</div>'
        },

        _renderTypes: {
            days: function () {
                var dayNames = this._getDayNamesHtml(this.d.loc.firstDay),
                    days = this._getDaysHtml(this.d.currentDate);

                this.$cells.html(days);
                this.$names.html(dayNames)
            },
            months: function () {
                var html = this._getMonthsHtml(this.d.currentDate);

                this.$cells.html(html)
            },
            years: function () {
                var html = this._getYearsHtml(this.d.currentDate);

                this.$cells.html(html)
            }
        },

        _render: function () {
            if (this.opts.onlyTimepicker) return;
            this._renderTypes[this.type].bind(this)();
        },

        _update: function () {
            var $cells = $('.datepicker--cell', this.$cells),
                _this = this,
                classes,
                $cell,
                date;
            $cells.each(function (cell, i) {
                $cell = $(this);
                date = _this.d._getDateFromCell($(this));
                classes = _this._getCellContents(date, _this.d.cellType);
                $cell.attr('class',classes.classes)
            });
        },

        show: function () {
            if (this.opts.onlyTimepicker) return;
            this.$el.addClass('active');
            this.acitve = true;
        },

        hide: function () {
            this.$el.removeClass('active');
            this.active = false;
        },

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

        _handleClick: function (el) {
            var date = el.data('date') || 1,
                month = el.data('month') || 0,
                year = el.data('year') || this.d.parsedDate.year,
                dp = this.d;
            // Change view if min view does not reach yet
            if (dp.view != this.opts.minView) {
                dp.down(new Date(year, month, date));
                return;
            }
            // Select date if min view is reached
            var selectedDate = new Date(year, month, date),
                alreadySelected = this.d._isSelected(selectedDate, this.d.cellType);

            if (!alreadySelected) {
                dp._trigger('clickCell', selectedDate);
                return;
            }

            dp._handleAlreadySelectedDates.bind(dp, alreadySelected, selectedDate)();

        },

        _onClickCell: function (e) {
            var $el = $(e.target).closest('.datepicker--cell');

            if ($el.hasClass('-disabled-')) return;

            this._handleClick.bind(this)($el);
        }
    };
})();