document.addEventListener('DOMContentLoaded', function() {
    // Initialize feather icons
    feather.replace();

    // Command panel toggle
    const commandPanel = document.querySelector('.command-panel');
    document.addEventListener('keydown', function(e) {
        if ((e.ctrlKey || e.metaKey) && e.key === 'k') {
            e.preventDefault();
            commandPanel.classList.toggle('open');
        }
    });

    document.querySelector('.close-panel').addEventListener('click', function() {
        commandPanel.classList.remove('open');
    });

    // Floating action button
    document.querySelector('.fab').addEventListener('click', function() {
        commandPanel.classList.add('open');
    });

    // Cell selection functionality
    // Initialize cell click handlers
    const cells = document.querySelectorAll('.task-cell');
    cells.forEach(cell => {
        cell.addEventListener('click', taskCellClickHandler);
    });
// Drag and drop functionality
    const taskItems = document.querySelectorAll('.task-item');
    taskItems.forEach(item => {
        item.setAttribute('draggable', 'true');
        
        item.addEventListener('dragstart', function(e) {
            e.dataTransfer.setData('text/plain', this.dataset.taskId || '');
            this.classList.add('dragging');
        });
        
        item.addEventListener('dragend', function() {
            this.classList.remove('dragging');
        });
    });

    cells.forEach(cell => {
        cell.addEventListener('dragover', function(e) {
            e.preventDefault();
            if (!this.classList.contains('pto-cell')) {
                this.classList.add('drop-target');
            }
        });
        
        cell.addEventListener('dragleave', function() {
            this.classList.remove('drop-target');
        });
        
        cell.addEventListener('drop', function(e) {
            e.preventDefault();
            this.classList.remove('drop-target');
            
            // TODO: Handle the drop logic
            // const taskId = e.dataTransfer.getData('text/plain');
            // Move task to this cell
        });
    });
    // Add Team Member functionality
    document.querySelector('.team-management .btn-primary').addEventListener('click', function() {
        const teamName = prompt('Enter team member name:');
        if (teamName && teamName.trim()) {
            const initials = teamName.trim().split(' ').map(n => n[0]).join('').toUpperCase();
            const calendarGrid = document.querySelector('.calendar-grid');
            const dateCells = document.querySelectorAll('.date-column .date-cell');
            
            // Create new team column
            const newColumn = document.createElement('div');
            newColumn.className = 'team-column';
            
            // Build member header
            const headerHTML = `
                <div class="member-header">
                    <div class="member-avatar">${initials}</div>
                    <div class="member-name">${teamName.toLowerCase()}</div>
                    <button class="remove-col">&times;</button>
                </div>
            `;
            
            // Build task cells corresponding to each date cell
            let cellsHTML = '';
            dateCells.forEach(() => {
                cellsHTML += '<div class="task-cell"></div>';
            });
            
            newColumn.innerHTML = headerHTML + cellsHTML;

            // Set up drag and drop for new cells
            newColumn.querySelectorAll('.task-cell').forEach(cell => {
                cell.addEventListener('dragover', function(e) {
                    e.preventDefault();
                    if (!this.classList.contains('pto-cell')) {
                        this.classList.add('drop-target');
                    }
                });
                
                cell.addEventListener('dragleave', function() {
                    this.classList.remove('drop-target');
                });
                
                cell.addEventListener('drop', function(e) {
                    e.preventDefault();
                    this.classList.remove('drop-target');
                });
            });
            // Insert before milestone column
            const milestoneColumn = document.querySelector('.milestone-column');
            calendarGrid.insertBefore(newColumn, milestoneColumn);

            // Add remove functionality
            newColumn.querySelector('.remove-col').addEventListener('click', function(e) {
                e.stopPropagation();
                if (confirm(`Remove ${teamName} from team?`)) {
                    newColumn.remove();
                }
            });

            // Add cell click handlers to new cells
            newColumn.querySelectorAll('.task-cell').forEach(cell => {
                cell.addEventListener('click', taskCellClickHandler);
                
                // Make cells droppable for tasks
                cell.addEventListener('dragover', function(e) {
                    e.preventDefault();
                    if (!this.classList.contains('pto-cell')) {
                        this.classList.add('drop-target');
                    }
                });
                
                cell.addEventListener('dragleave', function() {
                    this.classList.remove('drop-target');
                });
                
                cell.addEventListener('drop', function(e) {
                    e.preventDefault();
                    this.classList.remove('drop-target');
                });
            });
        }
    });
    function taskCellClickHandler(e) {
        // Don't select if clicking on a child element that has its own handler
        if (e.target !== this && e.target.closest('a')) return;

        // Toggle selection
        if (e.ctrlKey || e.metaKey) {
            // Multi-select
            this.classList.toggle('selected');
        } else if (e.shiftKey) {
            // Range select
            // TODO: Implement range selection logic
        } else {
            // Single select
            document.querySelectorAll('.task-cell.selected').forEach(el => {
                el.classList.remove('selected');
            });
            this.classList.add('selected');
        }

        // Focus on clicked cell for keyboard navigation
        this.focus();
    }
// Date range selector
    const rangeButtons = document.querySelectorAll('.range-btn');
rangeButtons.forEach(button => {
        button.addEventListener('click', function() {
            rangeButtons.forEach(btn => btn.classList.remove('active'));
            this.classList.add('active');
            // TODO: Update calendar view based on selected range
        });
    });
    // Keyboard shortcuts
    document.addEventListener('keydown', function(e) {
        if (e.key === 'Escape') {
            // Clear selections
            document.querySelectorAll('.task-cell.selected').forEach(el => {
                el.classList.remove('selected');
            });
        } else if (e.key === 'Enter' && document.activeElement.classList.contains('task-cell')) {
            // Open task editor when pressing enter on a cell
            const selectedCell = document.activeElement;
            const taskTitle = prompt('Enter task title:');
            if (taskTitle) {
                const hours = prompt('Estimated hours:');
                const status = prompt('Status (complete/in-progress/blocked/not-started):');
                
                selectedCell.innerHTML = `
                    <div class="task-item" data-status="${status || 'not-started'}">
                        <span class="status-indicator"></span>
                        <span class="task-title">${taskTitle}</span>
                        <span class="task-meta">${hours || '0'}h</span>
                    </div>
                `;
                
                // Make the new task draggable
                selectedCell.querySelector('.task-item').setAttribute('draggable', 'true');
                selectedCell.querySelector('.task-item').addEventListener('dragstart', function(e) {
                    e.dataTransfer.setData('text/plain', this.dataset.taskId || '');
                    this.classList.add('dragging');
                });
                
                selectedCell.querySelector('.task-item').addEventListener('dragend', function() {
                    this.classList.remove('dragging');
                });
            }
        }
    });
    // Initialize with some default team members
    function initializeDefaultTeam() {
        const defaultMembers = ['Alice Smith', 'Bob Johnson', 'Charlie Brown'];
        defaultMembers.forEach(member => {
            const initials = member.split(' ').map(n => n[0]).join('').toUpperCase();
            const calendarGrid = document.querySelector('.calendar-grid');
            
            const newColumn = document.createElement('div');
            newColumn.className = 'team-column';
            newColumn.innerHTML = `
                <div class="member-header">
                    <div class="member-avatar">${initials}</div>
                    <div class="member-name">${member.toLowerCase().split(' ')[0]}</div>
                    <button class="remove-col">&times;</button>
                </div>
                <div class="task-cell"></div>
                <div class="task-cell"></div>
                <div class="task-cell"></div>
                <div class="task-cell"></div>
                <div class="task-cell"></div>
            `;

            const milestoneColumn = document.querySelector('.milestone-column');
            calendarGrid.insertBefore(newColumn, milestoneColumn);

            newColumn.querySelector('.remove-col').addEventListener('click', function(e) {
                e.stopPropagation();
                if (confirm(`Remove ${member} from team?`)) {
                    newColumn.remove();
                }
            });

            newColumn.querySelectorAll('.task-cell').forEach(cell => {
                cell.addEventListener('click', taskCellClickHandler);
                cell.tabIndex = 0; // Make cells focusable for keyboard navigation
            });
        });
    }

    // Call initialization
    initializeDefaultTeam();
});

// TODO: Add more advanced calendar functionality