// js/components/calendar.js

// Import time utilities
import { timeToMinutes, formatDate } from '../utils/time-utils.js';
import { fetchAvailability } from '../utils/api.js';

// Global variables for calendar
let currentAdminDate = new Date();
let currentAdminMonth = currentAdminDate.getMonth();
let currentAdminYear = currentAdminDate.getFullYear();
let selectedAdminDate = null;
const months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'];

// Render the admin calendar with available dates highlighted
async function renderAdminCalendar(month, year) {
    const adminCalendarDates = document.getElementById('adminCalendarDates');
    const adminMonthYear = document.getElementById('adminMonthYear');
    if (!adminCalendarDates || !adminMonthYear) {
        console.error('Required calendar elements not found');
        return;
    }

    // Clear existing calendar
    adminCalendarDates.innerHTML = '';
    adminMonthYear.textContent = `${months[month]} ${year}`;

    // Get current UID and availability
    const selectedUid = document.getElementById('uidSelect').value;
    if (!selectedUid) {
        // If no UID selected, just show empty calendar
        return;
    }

    const firstDay = new Date(year, month, 1).getDay();
    const daysInMonth = new Date(year, month + 1, 0).getDate();
    const today = new Date();
    const currentMinutes = today.getHours() * 60 + today.getMinutes();
    const availability = await fetchAvailability();

    // Start of today (midnight)
    const startOfToday = new Date(today.getFullYear(), today.getMonth(), today.getDate());

    // Create blank cells for days before the first day of the month
    for (let i = 0; i < firstDay; i++) {
        const blank = document.createElement('div');
        blank.classList.add('date-item', 'p-2', 'rounded-pill', 'text-center', 'text-muted', 'empty-cell');
        blank.style.cursor = 'default'; // Remove pointer cursor
        blank.style.pointerEvents = 'none'; // Disable hover and click events
        adminCalendarDates.appendChild(blank);
    }

    // Clear any existing selected date
    const existingSelected = adminCalendarDates.querySelector('.selected');
    if (existingSelected) {
        existingSelected.classList.remove('selected');
    }

    // Populate the calendar with days
    let todayElement = null;
    for (let i = 1; i <= daysInMonth; i++) {
        const day = document.createElement('div');
        day.classList.add('date-item', 'p-2', 'rounded-pill', 'text-center');
        day.textContent = i;
        const date = new Date(year, month, i);
        const dateStr = formatDate(date);

        // Check if date is in the past
        const isPastDate = date < startOfToday;
        const isToday = date.toDateString() === today.toDateString();

        if (isToday) {
            day.classList.add('current');
            todayElement = day;
        }
        
        // Check if the date has available time slots
        let hasAvailableTimes = false;
        if (availability[dateStr]) {
            let times = [];
            if (typeof availability[dateStr] === 'string') {
                times = availability[dateStr].split(',').map(t => t.trim());
            } else if (Array.isArray(availability[dateStr])) {
                times = availability[dateStr].map(t => t.trim());
            }
            
            // For today, filter out past times
            if (isToday) {
                times = times.filter(time => timeToMinutes(time) > currentMinutes);
            }
            
            // Only mark as available if there are valid times
            hasAvailableTimes = times.length > 0;
        }
        
        // Only add 'available' class if the date is not in the past AND has available times
        if (hasAvailableTimes && !isPastDate) {
            day.classList.add('available');
        }
        
        if (isPastDate) {
            day.classList.add('disabled');
        } else {
            day.addEventListener('click', () => selectAdminDate(date, firstDay));
        }
        adminCalendarDates.appendChild(day);
    }

    // If a date was previously selected, re-select it
    if (selectedAdminDate && 
        selectedAdminDate.getMonth() === month && 
        selectedAdminDate.getFullYear() === year) {
        selectAdminDate(selectedAdminDate, firstDay);
    }
}

// Handle admin date selection
async function selectAdminDate(date, firstDay) {
    // Check if the date is in the past
    const today = new Date();
    const startOfToday = new Date(today.getFullYear(), today.getMonth(), today.getDate());
    if (date < startOfToday) {
        console.warn('Attempted to select a past date');
        return;
    }

    // Update selected date
    selectedAdminDate = date;
    
    // Get the date string for the selected date
    const dateStr = formatDate(date);
    
    // Trigger the updateTimeSlots function in admin.js
    const event = new CustomEvent('dateSelected', { 
        detail: { dateStr: dateStr }
    });
    document.dispatchEvent(event);
    
    // Update UI to show selected date
    const dateItems = document.querySelectorAll('#adminCalendarDates .date-item');
    dateItems.forEach(item => item.classList.remove('selected')); // Ensure only one date is selected
    
    // Find the exact date item for the clicked date
    const selectedDay = Array.from(dateItems).find(item => {
        const dayText = item.textContent;
        if (!dayText || isNaN(parseInt(dayText))) return false;
        const itemDate = new Date(currentAdminYear, currentAdminMonth, parseInt(dayText));
        return itemDate.toDateString() === date.toDateString();
    });
    
    if (selectedDay) selectedDay.classList.add('selected');
    
    const selectedDateDisplay = document.getElementById('selectedDateDisplay');
    if (selectedDateDisplay) {
        selectedDateDisplay.textContent = '';
    }
    
    // Show the availability section
    const availabilitySection = document.getElementById('availabilitySection');
    if (availabilitySection) {
        availabilitySection.classList.remove('d-none');
    }
}

// Export functions for use in other files
export { 
    renderAdminCalendar, 
    selectAdminDate, 
    currentAdminMonth,
    currentAdminYear,
    selectedAdminDate,
    months
};