(function($) {

    "use strict";

    document.addEventListener('DOMContentLoaded', function() {
        var today = new Date(),
            year = today.getFullYear(),
            month = today.getMonth(),
            day = today.getDate(), // Dia atual
            monthTag = ["Janeiro", "Fevereiro", "Março", "Abril", "Maio", "Junho", "Julho", "Agosto", "Setembro", "Outubro", "Novembro", "Dezembro"],
            days = document.getElementsByTagName('td'),
            selectedDay,
            setDate,
            daysLen = days.length;

        function Calendar(selector, options) {
            this.options = options;
            this.draw();
        }

        Calendar.prototype.draw = function() {
            this.getCookie('selected_day');
            this.getOptions();
            this.loadToday(); // Carrega a agenda do dia atual
            this.drawHeader();
            this.drawDays();
            var that = this,
                reset = document.getElementById('reset'),
                pre = document.getElementsByClassName('pre-button'),
                next = document.getElementsByClassName('next-button'),
                todayBtn = document.getElementById('today');

            pre[0].addEventListener('click', function() {
                that.preMonth();
            });
            next[0].addEventListener('click', function() {
                that.nextMonth();
            });
            reset.addEventListener('click', function() {
                that.reset();
            });
            todayBtn.addEventListener('click', function() {
                that.loadToday(); // Carrega a agenda do dia atual ao clicar em "Hoje"
            });
            while (daysLen--) {
                days[daysLen].addEventListener('click', function() {
                    that.clickDay(this);
                });
            }
        };

        Calendar.prototype.drawHeader = function() {
            var headDay = document.getElementsByClassName('head-day'),
                headMonth = document.getElementsByClassName('head-month');

            headDay[0].innerHTML = day; // Exibe o dia atual
            headMonth[0].innerHTML = monthTag[month] + " - " + year;
        };

        Calendar.prototype.drawDays = function() {
            var startDay = new Date(year, month, 1).getDay(),
                nDays = new Date(year, month + 1, 0).getDate(),
                n = startDay,
                selectDia = month + 1;

            for (var k = 0; k < 42; k++) {
                days[k].innerHTML = '';
                days[k].id = (year) + '-' + (month + 1) + '-' + (k + 1);
                days[k].className = '';
            }

            for (var i = 1; i <= nDays; i++) {
                days[n].innerHTML = i;
                n++;
            }

            // Destacar o dia atual no calendário
            var todayIndex = day + startDay - 1;
            if (todayIndex >= 0 && todayIndex < 42) {
                days[todayIndex].id = "today";
            }
        };

        Calendar.prototype.loadToday = function() {
            // Atualiza a data atual antes de carregar
            today = new Date();
            year = today.getFullYear();
            month = today.getMonth();
            day = today.getDate();

            this.drawHeader();
            this.drawDays();
            this.clickDay(days[day + new Date(year, month, 1).getDay() - 1]); // Carrega a agenda do dia atual ao clicar em "Hoje"
        };

        Calendar.prototype.clickDay = function(o) {
            var dia = o.innerHTML;
            var selected = document.getElementsByClassName("selected");
            var len = selected.length;

            if (len !== 0) {
                selected[0].className = "";
            }

            o.className = "selected";
            selectedDay = new Date(year, month, dia); // Cria a data selecionada

            this.drawHeader();
            this.setCookie('selected_day', 1);

            // Envia a data completa no formato YYYY-MM-DD para o servidor via AJAX
            var dataCompleta = year + '-' + ('0' + (month + 1)).slice(-2) + '-' + ('0' + dia).slice(-2);

            $.ajax({
                url: 'calendar_files/events.php',
                type: 'POST',
                data: { data: dataCompleta },
                beforeSend: function() {
                    $("#cod_cidades").css({ 'display': 'block' });
                    $("#cod_cidades").html("Carregando...");
                },
                success: function(data) {
                    $("#cod_cidades").css({ 'display': 'block' });
                    $("#cod_cidades").html(data);
                },
                error: function(data) {
                    $("#cod_cidades").css({ 'display': 'block' });
                    $("#cod_cidades").html("Erro ao carregar");
                }
            });
        };

        Calendar.prototype.preMonth = function() {
            if (month < 1) {
                month = 11;
                year = year - 1;
            } else {
                month = month - 1;
            }
            this.drawHeader();
            this.drawDays();
        };

        Calendar.prototype.nextMonth = function() {
            if (month >= 11) {
                month = 0;
                year = year + 1;
            } else {
                month = month + 1;
            }
            this.drawHeader();
            this.drawDays();
        };

        Calendar.prototype.getOptions = function() {
            if (this.options) {
                var sets = this.options.split('-');
                setDate = new Date(sets[0], sets[1] - 1, sets[2]);
                day = setDate.getDate();
                year = setDate.getFullYear();
                month = setDate.getMonth();
            }
        };

        Calendar.prototype.reset = function() {
            today = new Date(); // Reinicia para o dia atual
            year = today.getFullYear();
            month = today.getMonth();
            day = today.getDate();
            this.options = undefined;
            this.drawHeader();
            this.drawDays();
        };

        Calendar.prototype.setCookie = function(name, expiredays) {
            if (expiredays) {
                var date = new Date();
                date.setTime(date.getTime() + (expiredays * 24 * 60 * 60 * 1000));
                var expires = "; expires=" + date.toGMTString();
            } else {
                var expires = "";
            }
            document.cookie = name + "=" + selectedDay + expires + "; path=/";
        };

        Calendar.prototype.getCookie = function(name) {
            if (document.cookie.length) {
                var arrCookie = document.cookie.split(';'),
                    nameEQ = name + "=";
                for (var i = 0, cLen = arrCookie.length; i < cLen; i++) {
                    var c = arrCookie[i];
                    while (c.charAt(0) == ' ') {
                        c = c.substring(1, c.length);
                    }
                    if (c.indexOf(nameEQ) === 0) {
                        selectedDay = new Date(c.substring(nameEQ.length, c.length));
                    }
                }
            }
        };

        var calendar = new Calendar();

    }, false);

})(jQuery);