// public/admin.js (for admin.html)

// Global variables
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'];

// Helper function to convert time string to minutes since midnight
function timeToMinutes(timeStr) {
    const match = timeStr.match(/([0-9]+)(?::([0-9]+))?(am|pm)/i);
    if (!match) return 0;
    
    let hours = parseInt(match[1]);
    const minutes = parseInt(match[2] || '0');
    const meridian = match[3].toLowerCase();
    
    if (meridian === 'pm' && hours !== 12) {
        hours += 12;
    } else if (meridian === 'am' && hours === 12) {
        hours = 0;
    }
    
    return hours * 60 + minutes;
}

// Helper function to ensure consistent time format
function formatTimeSlot(hour) {
    const meridian = hour >= 12 ? 'pm' : 'am';
    const displayHour = hour > 12 ? hour - 12 : (hour === 0 ? 12 : hour);
    return `${displayHour}:00${meridian}`;
}

// 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 = date.toISOString().split('T')[0];

        // 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 and time slots
    selectedAdminDate = date;
    await updateTimeSlots(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;
        const itemDate = new Date(currentAdminYear, currentAdminMonth, parseInt(dayText));
        return itemDate.toDateString() === date.toDateString();
    });
    if (selectedDay) selectedDay.classList.add('selected');
    
    // Remove the selected date display text
    const selectedDateDisplay = document.getElementById('selectedDateDisplay');
    if (selectedDateDisplay) {
        selectedDateDisplay.textContent = '';
    }
}

// Update time slots based on selected date
async function updateTimeSlots(date) {
    const availability = await fetchAvailability();
    const dateStr = date.toISOString().split('T')[0];
    let availableTimes = [];
    
    // Handle case where availability might be undefined or null
    if (availability && availability[dateStr]) {
        if (typeof availability[dateStr] === 'string') {
            availableTimes = availability[dateStr].split(',').map(t => t.trim());
        } else if (Array.isArray(availability[dateStr])) {
            availableTimes = [...availability[dateStr]];
        }
    }

    // Sort available times chronologically
    availableTimes.sort((a, b) => timeToMinutes(a) - timeToMinutes(b));

    const timeSlots = document.getElementById('timeSlots');
    if (!timeSlots) return;
    
    // Clear existing time slots
    timeSlots.innerHTML = '';
    
    // Create time button directly without the container and heading
    const timeButton = document.createElement('button');
    timeButton.type = 'button';
    timeButton.id = 'customTimeInput';
    timeButton.classList.add('btn', 'btn-success', 'btn-lg', 'w-100', 'mb-4');
    timeButton.style.backgroundColor = '#2e8b57'; // Money green color
    timeButton.style.borderColor = '#2e8b57';
    timeButton.style.fontSize = '1.25rem';
    timeButton.style.padding = '0.75rem 1.25rem';
    timeButton.innerHTML = '<i class="bi bi-clock"></i> Add Time Slot';
    
    // Add button directly to time slots
    timeSlots.appendChild(timeButton);
    
    // Initialize visual time picker
    initializeVisualTimePicker(dateStr, availableTimes);
    
    // Add divider
    const divider = document.createElement('hr');
    timeSlots.appendChild(divider);
    
    // Display existing time slots
    if (availableTimes.length === 0) {
        const noTimesMessage = document.createElement('p');
        noTimesMessage.classList.add('text-muted', 'text-center');
        noTimesMessage.textContent = 'No time slots available for this date.';
        timeSlots.appendChild(noTimesMessage);
    } else {
        // Create container for time slot list
        const timeSlotsContainer = document.createElement('div');
        timeSlotsContainer.classList.add('d-flex', 'flex-column', 'gap-2', 'mt-3');

        // Display all slots in chronological order
        availableTimes.forEach(time => {
            // Create a container div for the time slot
            const timeSlotContainer = document.createElement('div');
            timeSlotContainer.classList.add('position-relative', 'w-100', 'd-flex', 'align-items-center', 'mb-2');
            
            // Create the time slot pill
            const timeSlotItem = document.createElement('div');
            timeSlotItem.classList.add('btn', 'btn-light', 'rounded-pill', 'px-4', 'py-3', 'flex-grow-1');
            timeSlotItem.style.backgroundColor = '#e9f2ff';
            timeSlotItem.style.color = '#0d6efd';
            timeSlotItem.style.border = '1px solid #0d6efd';
            timeSlotItem.style.textAlign = 'center';
            timeSlotItem.style.fontSize = '1.1rem';
            timeSlotItem.style.fontWeight = '500';
            timeSlotItem.style.transition = 'all 0.2s ease';
            
            // Add time text directly to the pill
            timeSlotItem.textContent = time;
            
            // Add delete button/icon as a separate element
            const deleteIcon = document.createElement('button');
            deleteIcon.innerHTML = '<i class="bi bi-trash"></i>';
            deleteIcon.classList.add('btn', 'btn-sm', 'text-danger', 'ms-3');
            deleteIcon.style.backgroundColor = 'transparent';
            deleteIcon.style.border = 'none';
            deleteIcon.style.fontSize = '1.2rem';
            deleteIcon.style.padding = '8px';
            deleteIcon.style.cursor = 'pointer';
            deleteIcon.style.transition = 'all 0.2s ease';
            deleteIcon.style.opacity = '0.8';
            deleteIcon.style.borderRadius = '50%';
            deleteIcon.style.display = 'flex';
            deleteIcon.style.alignItems = 'center';
            deleteIcon.style.justifyContent = 'center';
            
            // Add hover effects
            timeSlotItem.addEventListener('mouseenter', () => {
                timeSlotItem.style.backgroundColor = '#0d6efd';
                timeSlotItem.style.color = 'white';
                timeSlotItem.style.transform = 'translateY(-2px)';
                timeSlotItem.style.boxShadow = '0 4px 8px rgba(0, 0, 0, 0.1)';
            });
            
            timeSlotItem.addEventListener('mouseleave', () => {
                timeSlotItem.style.backgroundColor = '#e9f2ff';
                timeSlotItem.style.color = '#0d6efd';
                timeSlotItem.style.transform = 'translateY(0)';
                timeSlotItem.style.boxShadow = 'none';
            });
            
            // Add hover effects for delete icon
            deleteIcon.addEventListener('mouseenter', () => {
                deleteIcon.style.opacity = '1';
                deleteIcon.style.transform = 'scale(1.2)';
                deleteIcon.style.backgroundColor = 'rgba(220, 53, 69, 0.1)';
            });
            
            deleteIcon.addEventListener('mouseleave', () => {
                deleteIcon.style.opacity = '0.8';
                deleteIcon.style.transform = 'scale(1)';
                deleteIcon.style.backgroundColor = 'transparent';
            });
            
            deleteIcon.addEventListener('click', (e) => {
                e.stopPropagation();
                removeTime(dateStr, time);
            });
            
            timeSlotContainer.appendChild(timeSlotItem);
            timeSlotContainer.appendChild(deleteIcon);
            timeSlotsContainer.appendChild(timeSlotContainer);
        });
        
        timeSlots.appendChild(timeSlotsContainer);
    }
}

// Initialize visual time picker function
function initializeVisualTimePicker(dateStr, availableTimes) {
    const timeButton = document.getElementById('customTimeInput');
    if (!timeButton) return;
    
    // Remove any existing time picker
    const existingTimePicker = document.getElementById('visualTimePicker');
    if (existingTimePicker) {
        existingTimePicker.remove();
    }
    
    // Create the visual time picker container
    const timePicker = document.createElement('div');
    timePicker.id = 'visualTimePicker';
    timePicker.classList.add('card', 'shadow');
    timePicker.style.display = 'none';
    timePicker.style.position = 'fixed';
    timePicker.style.zIndex = '1050';
    timePicker.style.width = '300px';
    timePicker.style.top = '50%';
    timePicker.style.left = '50%';
    timePicker.style.transform = 'translate(-50%, -50%)';
    
    // Create the header
    const header = document.createElement('div');
    header.classList.add('card-header', 'bg-primary', 'text-white', 'text-center', 'p-0');
    
    // Create the time display in the header
    const timeDisplay = document.createElement('div');
    timeDisplay.classList.add('display-4', 'py-3', 'mb-0');
    timeDisplay.innerHTML = '<span id="timePickerHour">12</span>:<span id="timePickerMinute">00</span> <span id="timePickerAMPM">PM</span>';
    header.appendChild(timeDisplay);
    
    timePicker.appendChild(header);
    
    // Create the body
    const body = document.createElement('div');
    body.classList.add('card-body', 'bg-white');
    
    // Create the clock face container
    const clockFace = document.createElement('div');
    clockFace.classList.add('time-picker-clock', 'mb-3');
    clockFace.style.position = 'relative';
    clockFace.style.width = '250px';
    clockFace.style.height = '250px';
    clockFace.style.margin = '0 auto';
    clockFace.style.backgroundColor = '#f8f9fa';
    clockFace.style.borderRadius = '50%';
    
    // Add clock center dot
    const clockCenter = document.createElement('div');
    clockCenter.style.position = 'absolute';
    clockCenter.style.top = '50%';
    clockCenter.style.left = '50%';
    clockCenter.style.transform = 'translate(-50%, -50%)';
    clockCenter.style.width = '8px';
    clockCenter.style.height = '8px';
    clockCenter.style.backgroundColor = '#0d6efd';
    clockCenter.style.borderRadius = '50%';
    clockFace.appendChild(clockCenter);
    
    // Add hour numbers to the clock face
    for (let i = 1; i <= 12; i++) {
        const hourNumber = document.createElement('div');
        hourNumber.classList.add('hour-number');
        hourNumber.textContent = i;
        hourNumber.style.position = 'absolute';
        hourNumber.style.width = '40px';
        hourNumber.style.height = '40px';
        hourNumber.style.textAlign = 'center';
        hourNumber.style.lineHeight = '40px';
        hourNumber.style.fontWeight = 'bold';
        hourNumber.style.cursor = 'pointer';
        
        // Calculate position (in a circle)
        const angle = (i * 30 - 90) * (Math.PI / 180); // 30 degrees per hour, starting at 12 o'clock
        const radius = 100; // Distance from center
        const left = 125 + radius * Math.cos(angle);
        const top = 125 + radius * Math.sin(angle);
        
        hourNumber.style.left = `${left - 20}px`; // Adjust for element width
        hourNumber.style.top = `${top - 20}px`; // Adjust for element height
        
        // Add click event to select hour
        hourNumber.addEventListener('click', () => {
            document.getElementById('timePickerHour').textContent = i;
            
            // Highlight selected hour
            document.querySelectorAll('.hour-number').forEach(el => {
                el.style.backgroundColor = 'transparent';
                el.style.color = '#212529';
            });
            hourNumber.style.backgroundColor = '#0d6efd';
            hourNumber.style.color = 'white';
            
            // Show minute selection
            showMinuteSelection();
        });
        
        clockFace.appendChild(hourNumber);
    }
    
    // Function to show minute selection
    function showMinuteSelection() {
        // Hide hour numbers
        document.querySelectorAll('.hour-number').forEach(el => {
            el.style.display = 'none';
        });
        
        // Show minute numbers
        document.querySelectorAll('.minute-number').forEach(el => {
            el.style.display = 'block';
        });
    }
    
    // Function to show hour selection
    function showHourSelection() {
        // Hide minute numbers
        document.querySelectorAll('.minute-number').forEach(el => {
            el.style.display = 'none';
        });
        
        // Show hour numbers
        document.querySelectorAll('.hour-number').forEach(el => {
            el.style.display = 'block';
        });
    }
    
    // Add minute numbers to the clock face (initially hidden)
    const minuteValues = [0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55];
    minuteValues.forEach((minute, index) => {
        const minuteNumber = document.createElement('div');
        minuteNumber.classList.add('minute-number');
        minuteNumber.textContent = minute.toString().padStart(2, '0');
        minuteNumber.style.position = 'absolute';
        minuteNumber.style.width = '40px';
        minuteNumber.style.height = '40px';
        minuteNumber.style.textAlign = 'center';
        minuteNumber.style.lineHeight = '40px';
        minuteNumber.style.fontWeight = 'bold';
        minuteNumber.style.cursor = 'pointer';
        minuteNumber.style.display = 'none'; // Initially hidden
        
        // Calculate position (in a circle)
        const angle = (index * 30 - 90) * (Math.PI / 180);
        const radius = 100; // Distance from center
        const left = 125 + radius * Math.cos(angle);
        const top = 125 + radius * Math.sin(angle);
        
        minuteNumber.style.left = `${left - 20}px`; // Adjust for element width
        minuteNumber.style.top = `${top - 20}px`; // Adjust for element height
        
        // Add click event to select minute
        minuteNumber.addEventListener('click', () => {
            document.getElementById('timePickerMinute').textContent = minute.toString().padStart(2, '0');
            
            // Highlight selected minute
            document.querySelectorAll('.minute-number').forEach(el => {
                el.style.backgroundColor = 'transparent';
                el.style.color = '#212529';
            });
            minuteNumber.style.backgroundColor = '#0d6efd';
            minuteNumber.style.color = 'white';
            
            // Show hour selection again
            showHourSelection();
        });
        
        clockFace.appendChild(minuteNumber);
    });
    
    body.appendChild(clockFace);
    
    // Create AM/PM toggle
    const ampmToggle = document.createElement('div');
    ampmToggle.classList.add('d-flex', 'justify-content-center', 'mb-3');
    
    const amButton = document.createElement('button');
    amButton.classList.add('btn', 'btn-outline-primary', 'me-2');
    amButton.textContent = 'AM';
    amButton.addEventListener('click', () => {
        document.getElementById('timePickerAMPM').textContent = 'AM';
        amButton.classList.add('active');
        pmButton.classList.remove('active');
    });
    
    const pmButton = document.createElement('button');
    pmButton.classList.add('btn', 'btn-outline-primary');
    pmButton.textContent = 'PM';
    pmButton.addEventListener('click', () => {
        document.getElementById('timePickerAMPM').textContent = 'PM';
        pmButton.classList.add('active');
        amButton.classList.remove('active');
    });
    pmButton.classList.add('active'); // Add active class to PM button
    
    ampmToggle.appendChild(amButton);
    ampmToggle.appendChild(pmButton);
    
    body.appendChild(ampmToggle);
    
    // Create action buttons
    const actionButtons = document.createElement('div');
    actionButtons.classList.add('d-flex', 'justify-content-between');
    
    const closeButton = document.createElement('button');
    closeButton.classList.add('btn', 'btn-outline-secondary', 'flex-grow-1', 'me-2');
    closeButton.textContent = 'CANCEL';
    closeButton.addEventListener('click', () => {
        timePicker.style.display = 'none';
    });
    
    const okButton = document.createElement('button');
    okButton.classList.add('btn', 'btn-primary', 'flex-grow-1');
    okButton.textContent = 'OK';
    okButton.addEventListener('click', () => {
        const hour = document.getElementById('timePickerHour').textContent;
        const minute = document.getElementById('timePickerMinute').textContent;
        const ampm = document.getElementById('timePickerAMPM').textContent.toLowerCase();
        
        const timeValue = `${hour}:${minute}${ampm}`;
        document.getElementById('customTimeInput').value = timeValue;
        
        // Check if time already exists in available times
        if (availableTimes.includes(timeValue)) {
            // Silently handle duplicate time slots - no error message
            console.log('Time slot already exists, not adding duplicate');
        } else {
            // Automatically add the time slot
            addSingleTime(dateStr, timeValue);
        }
        
        // Hide the time picker
        timePicker.style.display = 'none';
    });
    
    actionButtons.appendChild(closeButton);
    actionButtons.appendChild(okButton);
    
    body.appendChild(actionButtons);
    
    timePicker.appendChild(body);
    
    // Add the time picker to the document
    document.body.appendChild(timePicker);
    
    // Show time picker when button is clicked
    timeButton.addEventListener('click', (e) => {
        // Remove positioning relative to button
        timePicker.style.display = 'block';
        
        // Reset to default view (hour selection)
        showHourSelection();
        
        e.stopPropagation();
    });
    
    // Close time picker when clicking outside
    document.addEventListener('click', (e) => {
        if (e.target !== timeButton && !timePicker.contains(e.target)) {
            timePicker.style.display = 'none';
        }
    });
}

// Fetch available dates from the API
async function fetchAvailability() {
    try {
        const selectedUid = document.getElementById('uidSelect').value;
        if (!selectedUid) return {};

        const response = await fetch(`/api/availability/${selectedUid}`);
        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }
        const availability = await response.json();
        return availability;
    } catch (error) {
        console.error('Error fetching availability:', error);
        return {};
    }
}

// Helper function to update calendar UI after availability changes
async function updateAvailabilityUI() {
    const availability = await fetchAvailability();
    if (selectedAdminDate) {
        await updateTimeSlots(selectedAdminDate);
    }

    const calendarDates = document.getElementById('adminCalendarDates');
    if (calendarDates) {
        const allDateElements = calendarDates.querySelectorAll('.date-item');
        const today = new Date();
        const currentMinutes = today.getHours() * 60 + today.getMinutes();
        
        allDateElements.forEach(dateElement => {
            if (!dateElement.textContent) return; // Skip empty cells
            const day = parseInt(dateElement.textContent);
            const date = new Date(currentAdminYear, currentAdminMonth, day);
            const dateStr = date.toISOString().split('T')[0];
            
            // Check if date is in the past
            const startOfToday = new Date(today.getFullYear(), today.getMonth(), today.getDate());
            const isPastDate = date < startOfToday;
            const isToday = date.toDateString() === today.toDateString();
            
            // 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) {
                dateElement.classList.add('available');
            } else {
                dateElement.classList.remove('available');
            }
            
            // Always ensure past dates have the disabled class
            if (isPastDate) {
                dateElement.classList.add('disabled');
                dateElement.classList.remove('available');
            }
        });
    }
}

// UID management functions
async function loadUids() {
    try {
        const response = await fetch('/api/uids');
        if (!response.ok) {
            const errorData = await response.json();
            throw new Error(errorData.error || 'Failed to fetch UIDs');
        }
        const uids = await response.json();
        
        const select = document.getElementById('uidSelect');
        select.innerHTML = '<option value="">Select a Schedule UID...</option>';
        
        uids.forEach(uidObj => {
            const option = document.createElement('option');
            option.value = uidObj.uid;
            option.textContent = uidObj.uid;
            select.appendChild(option);
        });
    } catch (error) {
        console.error('Error loading UIDs:', error);
    }
}

async function createUid(uid) {
    try {
        const response = await fetch('/api/uids', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ uid })
        });
        
        if (!response.ok) {
            const errorData = await response.json();
            throw new Error(errorData.error || 'Failed to create UID');
        }

        // Reload UIDs and select the new one
        await loadUids();
        
        // Select the new UID and trigger change event
        const select = document.getElementById('uidSelect');
        select.value = uid;
        select.dispatchEvent(new Event('change'));


        return true;
    } catch (error) {
        console.error('Error creating UID:', error);
        return false;
    }
}

async function deleteUid(uid) {
    try {
        const response = await fetch(`/api/uids/${uid}`, {
            method: 'DELETE'
        });
        
        if (!response.ok) throw new Error('Failed to delete UID');
        await loadUids();
        return true;
    } catch (error) {
        console.error('Error deleting UID:', error);
        return false;
    }
}



// Add a single time for the selected date
async function addSingleTime(dateStr, time) {
    const selectedUid = document.getElementById('uidSelect').value;
    if (!selectedUid) {
        alert('Please select a UID first');
        return;
    }

    try {
        const availability = await fetchAvailability();
        let times = [];
        if (availability && availability[dateStr]) {
            if (typeof availability[dateStr] === 'string') {
                times = availability[dateStr].split(',').map(t => t.trim());
            } else if (Array.isArray(availability[dateStr])) {
                times = [...availability[dateStr]];
            }
        }
        times.push(time);

        const response = await fetch(`/api/availability/${selectedUid}`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ date: dateStr, times: [...new Set(times)] }) // Remove duplicates
        });

        if (!response.ok) {
            const errorData = await response.json();
            throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
        }

        const result = await response.json();
        console.log(result.message);
        await updateAvailabilityUI();
    } catch (error) {
        console.error('Error adding time slot:', error);
        alert('Failed to add time slot. Please try again.');
    }
}

// Remove a single time for the selected date
async function removeTime(dateStr, time) {
    const selectedUid = document.getElementById('uidSelect').value;
    if (!selectedUid) {
        alert('Please select a UID first');
        return;
    }

    try {
        const availability = await fetchAvailability();
        let times = [];
        if (availability && availability[dateStr]) {
            if (typeof availability[dateStr] === 'string') {
                times = availability[dateStr].split(',').filter(t => t.trim() !== time);
            } else if (Array.isArray(availability[dateStr])) {
                times = availability[dateStr].filter(t => t.trim() !== time);
            }
        }

        const response = await fetch(`/api/availability/${selectedUid}`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ date: dateStr, times })
        });

        if (!response.ok) {
            const errorData = await response.json();
            throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
        }
        await updateAvailabilityUI();
    } catch (error) {
        console.error('Error removing time slot:', error);
        alert('Failed to remove time slot. Please try again.');
    }
}

// Helper function to convert time string to minutes since midnight
function timeToMinutes(timeStr) {
    const match = timeStr.match(/([0-9]+)(?::([0-9]+))?(am|pm)/i);
    if (!match) return 0;
    
    let [_, hours, minutes, period] = match;
    hours = parseInt(hours);
    minutes = minutes ? parseInt(minutes) : 0;
    period = period.toLowerCase();

    if (period === 'pm' && hours !== 12) hours += 12;
    if (period === 'am' && hours === 12) hours = 0;
    
    return hours * 60 + minutes;
}

// Helper function to ensure consistent time format
function formatTimeSlot(hour) {
    const period = hour < 12 ? 'am' : 'pm';
    const displayHour = hour === 0 ? 12 : (hour > 12 ? hour - 12 : hour);
    return `${displayHour}:00${period}`;
}

document.addEventListener('DOMContentLoaded', async () => {
    // Add custom CSS for the current date to make it more distinguishable
    const style = document.createElement('style');
    style.textContent = `
        .date-item.current {
            border: 2px solid #ffc107 !important; /* Yellow border */
            background-color: rgba(255, 193, 7, 0.1) !important; /* Light yellow background */
            font-weight: bold !important;
            color: #212529 !important; /* Ensure text is visible */
        }
        
        /* Ensure current date styling takes precedence but doesn't interfere with selection */
        .date-item.current.selected {
            border: 2px solid #0d6efd !important; /* Blue border for selected */
            background-color: #0d6efd !important; /* Dark blue background when selected */
            color: white !important; /* White text for better contrast */
            font-weight: bold !important;
        }
        
        /* Prevent hover effects on empty calendar cells */
        .date-item.empty-cell {
            cursor: default !important;
            pointer-events: none !important;
        }
        
        .date-item.empty-cell:hover {
            background-color: transparent !important;
            transform: none !important;
        }
        
        /* Time picker styling */
        #visualTimePicker {
            box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
            border-radius: 8px;
            overflow: hidden;
        }
        
        #visualTimePicker .card-header {
            background-color: #0d6efd;
        }
        
        #visualTimePicker .display-4 {
            font-size: 3rem;
            font-weight: 300;
            color: white;
        }
        
        .time-picker-clock {
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        
        .hour-number, .minute-number {
            border-radius: 50%;
            transition: all 0.2s ease;
        }
        
        .hour-number:hover, .minute-number:hover {
            background-color: rgba(13, 110, 253, 0.1);
        }
        
        /* Time slot pills styling */
        .time-slot {
            transition: all 0.2s ease;
        }
        
        .time-slot:hover {
            transform: translateY(-2px);
        }
        
        /* Make all UID buttons consistent */
        #createUid, #deleteUid, #flushDatabase, #copyUrlBtn {
            border-radius: 30px;
            padding: 0.75rem 1.5rem;
            font-size: 1.25rem;
            font-weight: 500;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            transition: all 0.3s ease;
        }
        
        #createUid {
            background-color: #2e8b57; /* Money green color */
            border-color: #2e8b57;
        }
        
        #createUid:hover {
            background-color: #267349;
            border-color: #267349;
        }
        
        /* URL container styling */
        .url-container {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .url-display {
            flex-grow: 1;
            overflow: hidden;
            text-overflow: ellipsis;
        }
    `;
    document.head.appendChild(style);
    
    // Create and add the Copy URL button
    const urlContainer = document.querySelector('.form-control-lg.bg-light.p-3');
    if (urlContainer) {
        // Create a wrapper div for the URL and button
        const wrapper = document.createElement('div');
        wrapper.classList.add('url-container', 'mt-2');
        wrapper.style.display = 'flex';
        wrapper.style.alignItems = 'center';
        wrapper.style.gap = '10px';
        wrapper.style.flexWrap = 'nowrap'; // Prevent wrapping
        
        // Move the existing elements to the wrapper
        const uidPlaceholder = document.getElementById('uidPlaceholder');
        const uidUrl = document.getElementById('uidUrl');
        
        // Create a div to contain the URL display
        const urlDisplay = document.createElement('div');
        urlDisplay.classList.add('url-display');
        urlDisplay.style.overflow = 'hidden';
        urlDisplay.style.textOverflow = 'ellipsis';
        urlDisplay.style.whiteSpace = 'nowrap'; // Keep URL on one line
        urlDisplay.style.minWidth = '0'; // Allow flex item to shrink below content size
        urlDisplay.style.flexGrow = '1'; // Take available space
        urlDisplay.style.flexShrink = '1'; // Allow shrinking
        
        // Move the existing elements to the URL display div
        if (uidPlaceholder) urlDisplay.appendChild(uidPlaceholder);
        if (uidUrl) urlDisplay.appendChild(uidUrl);
        
        // Add the URL display to the wrapper
        wrapper.appendChild(urlDisplay);
        
        // Create the Copy URL button
        const copyUrlBtn = document.createElement('button');
        copyUrlBtn.id = 'copyUrlBtn';
        copyUrlBtn.classList.add('btn', 'btn-primary', 'rounded-pill', 'd-none');
        copyUrlBtn.style.height = '40px';
        copyUrlBtn.style.padding = '0 15px';
        copyUrlBtn.style.fontSize = '0.9rem';
        copyUrlBtn.style.whiteSpace = 'nowrap';
        copyUrlBtn.style.width = 'auto'; // Only as wide as content
        copyUrlBtn.style.minWidth = 'fit-content'; // Ensure it fits content
        copyUrlBtn.style.flexShrink = '0'; // Prevent button from shrinking
        
        copyUrlBtn.innerHTML = '<i class="bi bi-clipboard"></i><span style="margin-left: 8px;">Copy URL</span>';
        
        // Add click event to copy URL to clipboard
        copyUrlBtn.addEventListener('click', () => {
            const url = document.getElementById('uidUrl').href;
            if (url && url !== '#') {
                navigator.clipboard.writeText(url)
                    .then(() => {
                        // Change button text temporarily to indicate success
                        const originalText = copyUrlBtn.innerHTML;
                        copyUrlBtn.innerHTML = '<i class="bi bi-check"></i> Copied!';
                        copyUrlBtn.classList.remove('btn-primary');
                        copyUrlBtn.classList.add('btn-success');
                        
                        // Reset button after 2 seconds
                        setTimeout(() => {
                            copyUrlBtn.innerHTML = originalText;
                            copyUrlBtn.classList.remove('btn-success');
                            copyUrlBtn.classList.add('btn-primary');
                        }, 2000);
                    })
                    .catch(err => {
                        console.error('Failed to copy URL: ', err);
                        alert('Failed to copy URL to clipboard');
                    });
            }
        });
        
        // Add the button to the wrapper
        wrapper.appendChild(copyUrlBtn);
        
        // Clear the container and add the wrapper
        urlContainer.innerHTML = '';
        urlContainer.appendChild(document.createElement('small')).classList.add('d-block', 'text-muted', 'mb-1');
        urlContainer.querySelector('small').textContent = 'Public Access URL:';
        urlContainer.appendChild(wrapper);
        
        // Show the button if a UID is already selected
        const selectedUid = document.getElementById('uidSelect').value;
        if (selectedUid) {
            copyUrlBtn.classList.remove('d-none');
        }
    }
    
    // Load existing UIDs
    await loadUids();

    // Handle UID selection
    const uidSelect = document.getElementById('uidSelect');
    const deleteUidBtn = document.getElementById('deleteUid');
    const uidUrl = document.getElementById('uidUrl');
    const uidPlaceholder = document.getElementById('uidPlaceholder');

    uidSelect.addEventListener('change', async () => {
        const selectedUid = uidSelect.value;
        deleteUidBtn.disabled = !selectedUid;
        flushDatabaseBtn.disabled = !selectedUid;
        
        // Show or hide calendar and availability sections based on UID selection
        const calendarSection = document.getElementById('calendarSection');
        const calendarDatesSection = document.getElementById('calendarDatesSection');
        const availabilitySection = document.getElementById('availabilitySection');
        
        if (selectedUid) {
            calendarSection.classList.remove('d-none');
            calendarDatesSection.classList.remove('d-none');
            availabilitySection.classList.remove('d-none');
            
            // Show URL link and hide placeholder
            uidPlaceholder.classList.add('d-none');
            uidUrl.classList.remove('d-none');
            
            // Show copy button when URL is displayed
            if (document.getElementById('copyUrlBtn')) {
                document.getElementById('copyUrlBtn').classList.remove('d-none');
            }
        } else {
            calendarSection.classList.add('d-none');
            calendarDatesSection.classList.add('d-none');
            availabilitySection.classList.add('d-none');
            
            // Hide URL link and show placeholder
            uidPlaceholder.classList.remove('d-none');
            uidUrl.classList.add('d-none');
            
            // Hide copy button when no URL is displayed
            if (document.getElementById('copyUrlBtn')) {
                document.getElementById('copyUrlBtn').classList.add('d-none');
            }
        }
        
        // Clear current selections
        selectedAdminDate = null;
        const selectedDateElem = document.getElementById('selectedDateDisplay');
        const timeSlotsElem = document.getElementById('timeSlots');
        const calendarDatesElem = document.getElementById('adminCalendarDates');
        const adminMonthYear = document.getElementById('adminMonthYear');
        
        // Clear all UI elements
        if (selectedDateElem) selectedDateElem.textContent = '';
        if (timeSlotsElem) timeSlotsElem.innerHTML = '';
        if (calendarDatesElem) calendarDatesElem.innerHTML = '';
        if (adminMonthYear) adminMonthYear.textContent = '';
        
        if (selectedUid) {
            const url = `${window.location.origin}/${selectedUid}`;
            uidUrl.textContent = url;
            uidUrl.href = url;
            
            // Refresh calendar with new UID's data
            await renderAdminCalendar(currentAdminMonth, currentAdminYear);
            
            // Automatically select today's date and show time slots
            const today = new Date();
            if (today.getMonth() === currentAdminMonth && today.getFullYear() === currentAdminYear) {
                // Get the first day of the month to pass to selectAdminDate
                const firstDay = new Date(currentAdminYear, currentAdminMonth, 1).getDay();
                
                // Select today's date
                selectedAdminDate = today;
                await updateTimeSlots(today);
                
                // Highlight today in the calendar
                const dateItems = document.querySelectorAll('#adminCalendarDates .date-item');
                dateItems.forEach(item => item.classList.remove('selected'));
                
                // Find today's element in the calendar
                const todayDay = today.getDate();
                const todayElement = Array.from(dateItems).find(item => {
                    return item.textContent && parseInt(item.textContent) === todayDay;
                });
                
                if (todayElement) {
                    todayElement.classList.add('selected');
                }
            }
        } else {
            uidUrl.textContent = '';
            uidUrl.href = '#';
            // Add placeholder text
            if (selectedDateElem) selectedDateElem.textContent = 'Please select a UID to view the calendar';
            await renderAdminCalendar(currentAdminMonth, currentAdminYear);
        }
    });

    // Handle new UID creation
    const createUidBtn = document.getElementById('createUid');
    const modalUidInput = document.getElementById('modalUidInput');
    const confirmCreateUidBtn = document.getElementById('confirmCreateUid');
    const createUidModal = new bootstrap.Modal(document.getElementById('createUidModal'));

    // Add event listener for modal shown event to focus the input field
    document.getElementById('createUidModal').addEventListener('shown.bs.modal', function () {
        modalUidInput.focus();
    });

    createUidBtn.addEventListener('click', () => {
        modalUidInput.value = '';
        createUidModal.show();
    });

    // Add event listener for Enter key on the input field
    modalUidInput.addEventListener('keyup', (event) => {
        if (event.key === 'Enter') {
            confirmCreateUidBtn.click();
        }
    });

    confirmCreateUidBtn.addEventListener('click', async () => {
        const uid = modalUidInput.value.trim().toLowerCase();
        
        if (!/^[a-z0-9-]+$/.test(uid)) {
            alert('UID can only contain lowercase letters, numbers, and hyphens');
            return;
        }
        
        if (await createUid(uid)) {
            createUidModal.hide();
        } else {
            alert('Failed to create UID. Please try again.');
        }
    });

    // Handle UID deletion
    deleteUidBtn.addEventListener('click', async () => {
        const uid = uidSelect.value;
        if (!uid) return;
        
        if (!confirm(`Are you sure you want to delete UID: ${uid}?\nThis will remove all associated availability data.`)) {
            return;
        }
        
        if (await deleteUid(uid)) {
            // Clear selection and trigger change event
            uidSelect.value = '';
            uidSelect.dispatchEvent(new Event('change'));
        } else {
            alert('Failed to delete UID. Please try again.');
        }
    });

    // Initialize UI elements
    const adminCalendarDates = document.getElementById('adminCalendarDates');
    const adminMonthYear = document.getElementById('adminMonthYear');
    const adminPrevMonthBtn = document.getElementById('adminPrevMonth');
    const adminNextMonthBtn = document.getElementById('adminNextMonth');
    const selectedDateDisplay = document.getElementById('selectedDateDisplay');
    const timeSlots = document.getElementById('timeSlots');
    const flushDatabaseBtn = document.getElementById('flushDatabase');
    const resetDatabaseBtn = document.getElementById('resetDatabase');
    const devToolsBtn = document.getElementById('devToolsBtn');
    const devToolsModal = new bootstrap.Modal(document.getElementById('devToolsModal'));

    // Show Dev Tools modal when button is clicked
    devToolsBtn.addEventListener('click', () => {
        devToolsModal.show();
    });

    // Handle database reset
    resetDatabaseBtn.addEventListener('click', async () => {
        if (!confirm('⚠️ WARNING: This will permanently delete ALL UIDs and their associated availability data. This action cannot be undone.\n\nAre you absolutely sure you want to proceed?')) {
            return;
        }

        try {
            const response = await fetch('/api/reset', {
                method: 'POST'
            });

            if (!response.ok) {
                const errorData = await response.json();
                throw new Error(errorData.error || 'Failed to reset database');
            }

            // Reload the page to reset all state
            window.location.reload();
        } catch (error) {
            console.error('Error resetting database:', error);
            alert('Failed to reset database. Please try again.');
        }
    });

    // Check if a date has availability
    async function checkAvailabilityForDate(date) {
        const availability = await fetchAvailability();
        const dateStr = date.toISOString().split('T')[0];
        return !!availability[dateStr];
    }

    // Flush (delete) all entries from the database
    flushDatabaseBtn.addEventListener('click', async () => {
        const selectedUid = document.getElementById('uidSelect').value;
        if (!selectedUid) {
            alert('Please select a UID first');
            return;
        }

        if (!confirm(`Are you sure you want to delete ALL availability entries for UID: ${selectedUid}?`)) {
            return;
        }

        try {
            console.log(`Attempting to delete all availability for UID: ${selectedUid}...`);
            const response = await fetch(`/api/availability/${selectedUid}/flush`, {
                method: 'DELETE',
                headers: { 'Content-Type': 'application/json' }
            });

            if (!response.ok) {
                const errorData = await response.json();
                throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
            }

            const result = await response.json();
            console.log('Delete availability response:', result);
            
            // Refresh data
            await fetchAvailability(); // Refresh availability data
            
            // Reset UI
            selectedAdminDate = null; // Clear selected date
            selectedDateDisplay.textContent = '';
            timeSlots.innerHTML = ''; // Clear time slots
            await renderAdminCalendar(currentAdminMonth, currentAdminYear);
        } catch (error) {
            console.error('Error deleting availability:', error);
            alert('Failed to delete availability. Please try again.');
        }
    });

    // Navigate to previous month (admin)
    adminPrevMonthBtn.addEventListener('click', () => {
        currentAdminMonth--;
        if (currentAdminMonth < 0) {
            currentAdminMonth = 11;
            currentAdminYear--;
        }
        renderAdminCalendar(currentAdminMonth, currentAdminYear);
    });

    // Navigate to next month (admin)
    adminNextMonthBtn.addEventListener('click', () => {
        currentAdminMonth++;
        if (currentAdminMonth > 11) {
            currentAdminMonth = 0;
            currentAdminYear++;
        }
        renderAdminCalendar(currentAdminMonth, currentAdminYear);
    });

    // Handle global database flush
    const flushGlobalDatabaseBtn = document.getElementById('flushGlobalDatabase');
    if (flushGlobalDatabaseBtn) {
        flushGlobalDatabaseBtn.addEventListener('click', async () => {
            if (!confirm('WARNING: This will delete ALL UIDs and their availability data. This action cannot be undone. Are you sure you want to proceed?')) {
                return;
            }

            try {
                const response = await fetch('/api/flush-global', {
                    method: 'DELETE',
                    headers: { 'Content-Type': 'application/json' }
                });

                if (!response.ok) {
                    const errorData = await response.json();
                    throw new Error(errorData.error || `HTTP error! status: ${response.status}`);
                }

                const result = await response.json();
                console.log('Global database flush response:', result);
                alert(result.message || 'Database flushed successfully!');
                
                // Reset everything
                selectedAdminDate = null;
                const selectedDateElem = document.getElementById('selectedDateDisplay');
                const timeSlotsElem = document.getElementById('timeSlots');
                const calendarDatesElem = document.getElementById('adminCalendarDates');
                if (selectedDateElem) selectedDateElem.textContent = '';
                if (timeSlotsElem) timeSlotsElem.innerHTML = '';
                if (calendarDatesElem) calendarDatesElem.innerHTML = '';
                
                // Reload UIDs
                await loadUids();
                
                // Update UID URL display
                const uidUrl = document.getElementById('uidUrl');
                if (uidUrl) uidUrl.textContent = 'Select a UID first';
                
                // Disable delete button
                const deleteUidBtn = document.getElementById('deleteUid');
                if (deleteUidBtn) deleteUidBtn.disabled = true;
            } catch (error) {
                console.error('Error flushing database:', error);
                alert('Failed to flush database. Please try again.');
            }
        });
    }

    // Initial render with current date
    renderAdminCalendar(currentAdminMonth, currentAdminYear);
    if (currentAdminDate.getDate() <= new Date(currentAdminYear, currentAdminMonth, 0).getDate()) {
        const hasAvailability = await checkAvailabilityForDate(currentAdminDate);
        if (hasAvailability) {
            selectAdminDate(currentAdminDate, new Date(currentAdminYear, currentAdminMonth, 1).getDay());
        }
    }
});