let currentDate = new Date();
let selectedDate = null;
let selectedTime = null;
let occupiedSlots = {};

const demoData = {
    fecha: null,
    hora: null,
    nombre: '',
    apellido: '',
    email: '',
    telefono: '',
    empresa: '',
    cargo: '',
    tamano: '',
    industria: '',
    notas: '',
    codigoPromo: null
};

function parseOccupiedDates(fechasArray) {
    occupiedSlots = {};

    fechasArray.forEach(fechaISO => {
        const [datePart, timePart] = fechaISO.split('T');
        const [hours, minutes] = timePart.split(':');
        const timeSlot = `${hours}:${minutes}`;

        if (!occupiedSlots[datePart]) {
            occupiedSlots[datePart] = [];
        }

        occupiedSlots[datePart].push(timeSlot);
    });
}

// Horarios disponibles
const timeSlots = [
    { time: '09:00', label: '9:00 AM' },
    { time: '10:00', label: '10:00 AM' },
    { time: '11:00', label: '11:00 AM' },
    { time: '12:00', label: '12:00 PM' },
    { time: '13:00', label: '1:00 PM' },
    { time: '14:00', label: '2:00 PM' },
    { time: '15:00', label: '3:00 PM' },
    { time: '16:00', label: '4:00 PM' },
    { time: '17:00', label: '5:00 PM' }
];

function initCalendar() {
    renderCalendar(currentDate);
}

function isBusinessDay(date) {
    const day = date.getDay();
    return day !== 0 && day !== 6;
}

function getMinimumDate() {
    let minDate = new Date();
    let businessDaysCount = 0;

    while (businessDaysCount < 2) {
        minDate.setDate(minDate.getDate() + 1);
        if (isBusinessDay(minDate)) {
            businessDaysCount++;
        }
    }

    return minDate;
}

function isDateFullyOccupied(date) {
    // Un día está "lleno" cuando todos los horarios definidos en timeSlots
    // ya aparecen en occupiedSlots (suma de demos agendadas + bloqueos
    // administrativos). Usar every() es más robusto que comparar longitudes
    // porque tolera duplicados o entradas fuera del rango definido.
    const d = new Date(date);
    d.setHours(0, 0, 0, 0);
    const dateKey = d.toISOString().split('T')[0];
    const occupied = occupiedSlots[dateKey] || [];
    if (occupied.length < timeSlots.length) return false;
    return timeSlots.every(slot => occupied.includes(slot.time));
}

function isDateSelectable(date) {
    const minDate = getMinimumDate();
    minDate.setHours(0, 0, 0, 0);

    const checkDate = new Date(date);
    checkDate.setHours(0, 0, 0, 0);

    return isBusinessDay(date)
        && checkDate >= minDate
        && !isDateFullyOccupied(date);
}

function renderCalendar(date) {
    const year = date.getFullYear();
    const month = date.getMonth();

    const monthNames = ['Enero', 'Febrero', 'Marzo', 'Abril', 'Mayo', 'Junio',
                      'Julio', 'Agosto', 'Septiembre', 'Octubre', 'Noviembre', 'Diciembre'];
    $('#monthYear').text(`${monthNames[month]} ${year}`);

    const firstDay = new Date(year, month, 1);
    const lastDay = new Date(year, month + 1, 0);
    const prevLastDay = new Date(year, month, 0);

    const grid = $('#calendarGrid');

    grid.find('.calendar-day').remove();

    const firstDayOfWeek = firstDay.getDay();

    for (let i = firstDayOfWeek - 1; i >= 0; i--) {
        const day = prevLastDay.getDate() - i;
        const dayDate = new Date(year, month - 1, day);
        const dayDiv = $('<div>')
            .addClass('calendar-day other-month disabled')
            .text(day);
        grid.append(dayDiv);
    }

    const today = new Date();
    today.setHours(0, 0, 0, 0);

    for (let day = 1; day <= lastDay.getDate(); day++) {
        const dayDate = new Date(year, month, day);
        const dayDiv = $('<div>')
            .addClass('calendar-day')
            .text(day);

        if (dayDate.getTime() === today.getTime()) {
            dayDiv.addClass('today');
        }

        if (!isDateSelectable(dayDate)) {
            dayDiv.addClass('disabled');
        } else {
            dayDiv.click(function() {
                selectDate(dayDate);
            });
        }

        if (selectedDate && dayDate.getTime() === selectedDate.getTime()) {
            dayDiv.addClass('selected');
        }

        grid.append(dayDiv);
    }

    const remainingDays = 42 - grid.find('.calendar-day').length;
    for (let day = 1; day <= remainingDays; day++) {
        const dayDiv = $('<div>')
            .addClass('calendar-day other-month disabled')
            .text(day);
        grid.append(dayDiv);
    }

    const minDate = getMinimumDate();
    const prevMonth = new Date(year, month - 1, 1);

    if (prevMonth < new Date(minDate.getFullYear(), minDate.getMonth(), 1)) {
        $('#prevMonth').prop('disabled', true);
    } else {
        $('#prevMonth').prop('disabled', false);
    }
}

function selectDate(date) {
    selectedDate = new Date(date);
    selectedDate.setHours(0, 0, 0, 0);
    demoData.fecha = selectedDate.toISOString().split('T')[0];

    selectedTime = null;
    demoData.hora = null;

    $('#summaryTime, #summaryTime2, #confirmTime').text('-');

    renderCalendar(currentDate);
    updateSelectedDateDisplay();
    renderTimeSlots();
    changeStep(2);
}

function updateSelectedDateDisplay() {
    const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
    const dateStr = selectedDate.toLocaleDateString('es-MX', options);
    $('#selectedDateDisplay').text(dateStr);
    $('#summaryDate, #summaryDate2, #confirmDate').text(dateStr);
}

function renderTimeSlots() {
    const container = $('#timeSlotsContainer');
    container.empty();

    const selectedDateStr = demoData.fecha;
    const occupiedTimes = occupiedSlots[selectedDateStr] || [];

    timeSlots.forEach(slot => {
        const isOccupied = occupiedTimes.includes(slot.time);

        const slotDiv = $('<div>')
            .addClass('time-slot')
            .html(`
                <div>
                    <i class="bi bi-clock time-slot-icon me-3"></i>
                    <strong>${slot.label}</strong>
                    ${isOccupied ? '<span class="badge bg-danger ms-2">No disponible</span>' : ''}
                </div>
                <i class="bi bi-chevron-right"></i>
            `);

        if (isOccupied) {
            slotDiv.addClass('disabled');
            slotDiv.css('cursor', 'not-allowed');
        } else {
            slotDiv.click(function() {
                selectTimeSlot(slot);
            });
        }

        if (selectedTime === slot.time) {
            slotDiv.addClass('selected');
        }

        container.append(slotDiv);
    });
}

function selectTimeSlot(slot) {
    selectedTime = slot.time;
    demoData.hora = slot.time;

    $('#summaryTime, #summaryTime2, #confirmTime').text(slot.label);

    renderTimeSlots();

    setTimeout(() => {
        changeStep(3);
    }, 300);
}

function changeStep(step) {
    $('.demo-content').removeClass('active');
    $(`#demo-step-${step}`).addClass('active');

    $('.step').removeClass('active completed');

    for (let i = 1; i <= 4; i++) {
        if (i < step) {
            $(`#step-ind-${i}`).addClass('completed');
        } else if (i === step) {
            $(`#step-ind-${i}`).addClass('active');
        }
    }
}

function submitDemo() {
    const form = document.getElementById('demoLeadForm');

    if (!form.checkValidity()) {
        form.classList.add('was-validated');
        return;
    }

    demoData.nombre = $('#demoNombre').val();
    demoData.apellido = $('#demoApellido').val();
    demoData.email = $('#demoEmail').val();
    demoData.telefono = $('#demoTelefono').val();
    demoData.empresa = $('#demoEmpresa').val();
    demoData.cargo = $('#demoCargo').val();
    demoData.tamano = $('#demoTamano').val();
    demoData.industria = $('#demoIndustria').val();
    demoData.notas = $('#demoNotas').val();

    const codigoPromoActivo = $('#demoCheckCodigoPromo').is(':checked');
    demoData.codigoPromo = codigoPromoActivo
        ? ($('#demoInputCodigoPromo').val().trim() || null)
        : null;

    const fechaTexto = $('#summaryDate2').text() || demoData.fecha;
    const horaTexto = $('#summaryTime2').text() || demoData.hora;

    Swal.fire({
        title: '¿Confirmar tu demo?',
        html: `
            <p class="mb-2">Estás por agendar una demo con los siguientes datos:</p>
            <div class="text-start mt-3">
                <p class="mb-1"><strong>📅 Fecha:</strong> ${fechaTexto}</p>
                <p class="mb-1"><strong>🕐 Horario:</strong> ${horaTexto}</p>
                <p class="mb-1"><strong>📧 Correo:</strong> ${demoData.email}</p>
            </div>
        `,
        icon: 'question',
        showCancelButton: true,
        confirmButtonText: '<i class="bi bi-check-circle me-1"></i> Sí, agendar',
        cancelButtonText: '<i class="bi bi-x-circle me-1"></i> Cancelar',
        confirmButtonColor: '#0d6efd',
        cancelButtonColor: '#6c757d',
        reverseButtons: true
    }).then((result) => {
        if (result.isConfirmed) {
            enviarDemo();
        }
    });
}

function enviarDemo() {
    Swal.fire({
        title: 'Procesando...',
        text: 'Estamos agendando tu demo',
        allowOutsideClick: false,
        didOpen: () => {
            Swal.showLoading();
        }
    });

    $.ajax({
        url: '/landing-page/agendar-demo',
        type: 'POST',
        headers: {
            'X-CSRFToken': TokenFormData().get('csrf_token'),
        },
        contentType: 'application/json',
        data: JSON.stringify(demoData),
        success: function(response) {
            Swal.close();
            $('#confirmEmail').text(demoData.email);
            $('#confirmEmailDetail').text(demoData.email);

            confetti({
                particleCount: 100,
                spread: 70,
                origin: { y: 0.6 }
            });

            changeStep(4);
        },
        error: function(xhr) {
            Swal.close();
            manejarError(xhr);
        }
    });
}

function initEventHandlers() {
    $('#prevMonth').click(function() {
        currentDate.setMonth(currentDate.getMonth() - 1);
        renderCalendar(currentDate);
    });

    $('#nextMonth').click(function() {
        currentDate.setMonth(currentDate.getMonth() + 1);
        renderCalendar(currentDate);
    });
}

function openTermsConditions() {
    window.open("/terminoscondiciones", "Términos y Condiciones", 'directories=no,titlebar=no,toolbar=no,location=no,status=no,menubar=no,width=630,height=700');
}

function openAvisoPrivacidad() {
    window.open("/avisoprivacidad", "Aviso de Privacidad", 'directories=no,titlebar=no,toolbar=no,location=no,status=no,menubar=no,width=630,height=700');
}