/**
 * Admin Core Module
 * Contains core utilities, navigation, viewport management, and initialization coordination
 */

// Global admin state
let adminAppState = {
    currentSection: 'dashboard'
};

// Utility function to create a local date from YYYY-MM-DD string
// This prevents timezone issues when displaying dates
function createLocalDate(dateString) {
    if (!dateString) return null;
    const parts = dateString.split('-');
    if (parts.length !== 3) return new Date(dateString); // fallback to original behavior
    // Create date using local timezone (year, month-1, day)
    return new Date(parseInt(parts[0]), parseInt(parts[1]) - 1, parseInt(parts[2]));
}

// A function to set viewport dimensions for admin page
function setAdminViewportDimensions() {
    const doc = document.documentElement;
    
    // Set height and width
    doc.style.setProperty('--app-height', `${window.innerHeight}px`);
    doc.style.setProperty('--app-width', `${window.innerWidth}px`);
    
    // Handle safe area insets for devices with notches or home indicators
    if (CSS.supports('padding: env(safe-area-inset-top)')) {
        doc.style.setProperty('--safe-area-top', 'env(safe-area-inset-top)');
        doc.style.setProperty('--safe-area-bottom', 'env(safe-area-inset-bottom)');
        doc.style.setProperty('--safe-area-left', 'env(safe-area-inset-left)');
        doc.style.setProperty('--safe-area-right', 'env(safe-area-inset-right)');
    } else {
        doc.style.setProperty('--safe-area-top', '0px');
        doc.style.setProperty('--safe-area-bottom', '0px');
        doc.style.setProperty('--safe-area-left', '0px');
        doc.style.setProperty('--safe-area-right', '0px');
    }
}

// Add mobile menu functionality
function setupMobileMenu() {
    const menuToggle = document.getElementById('mobile-menu-toggle');
    const sidebar = document.getElementById('admin-sidebar');
    const closeSidebar = document.getElementById('close-sidebar');
    const adminNavLinks = document.querySelectorAll('.admin-nav a');
    
    if (menuToggle && sidebar) {
        // Toggle menu
        menuToggle.addEventListener('click', () => {
            sidebar.classList.toggle('active');
            menuToggle.classList.toggle('active');
            document.body.classList.toggle('sidebar-open');
        });
        
        // Close sidebar button
        if (closeSidebar) {
            closeSidebar.addEventListener('click', () => {
                sidebar.classList.remove('active');
                menuToggle.classList.remove('active');
                document.body.classList.remove('sidebar-open');
            });
        }
        
        // Close sidebar when clicking outside
        document.addEventListener('click', (e) => {
            if (sidebar.classList.contains('active') && 
                !sidebar.contains(e.target) && 
                !menuToggle.contains(e.target)) {
                sidebar.classList.remove('active');
                menuToggle.classList.remove('active');
                document.body.classList.remove('sidebar-open');
            }
        });
        
        // Close sidebar when navigation link is clicked on mobile
        adminNavLinks.forEach(link => {
            link.addEventListener('click', () => {
                if (window.innerWidth <= 768) {
                    sidebar.classList.remove('active');
                    menuToggle.classList.remove('active');
                    document.body.classList.remove('sidebar-open');
                }
            });
        });
    }
}

// Setup navigation between admin sections
function setupNavigation() {
    const navLinks = document.querySelectorAll('.admin-nav a');
    const sections = document.querySelectorAll('.admin-section');
    
    navLinks.forEach(link => {
        link.addEventListener('click', (e) => {
            e.preventDefault();
            
            const targetId = link.getAttribute('href').substring(1);
            
            // Update active nav
            navLinks.forEach(l => l.classList.remove('active'));
            link.classList.add('active');
            
            // Show target section
            sections.forEach(section => {
                section.style.display = section.id === targetId ? 'block' : 'none';
            });
            
            // Update URL hash and app state
            window.location.hash = targetId;
            adminAppState.currentSection = targetId;
            
            // Load section-specific data
            loadSectionData(targetId);
            
            // Close mobile menu if open
            const sidebar = document.getElementById('admin-sidebar');
            if (sidebar && sidebar.classList.contains('open')) {
                sidebar.classList.remove('open');
            }
        });
    });
    
    // Set initial active state based on current hash or default
    const currentHash = window.location.hash || '#dashboard';
    const activeLink = document.querySelector(`.admin-nav a[href="${currentHash}"]`);
    if (activeLink) {
        activeLink.classList.add('active');
    }
    
    // Check for initial hash routing
    const hash = window.location.hash;
    if (hash) {
        const sectionId = hash.substring(1);
        adminAppState.currentSection = sectionId;
        if (sectionId === 'shifts') {
            showSection('shifts');
        }
    }
}

// Helper function to show a specific section
function showSection(sectionId) {
    const sections = document.querySelectorAll('.admin-section');
    const navLinks = document.querySelectorAll('.admin-nav a');
    
    // Hide all sections
    sections.forEach(section => {
        section.style.display = section.id === sectionId ? 'block' : 'none';
    });
    
    // Update active nav
    navLinks.forEach(link => {
        const linkTarget = link.getAttribute('href').substring(1);
        link.classList.toggle('active', linkTarget === sectionId);
    });
    
    // Update app state
    adminAppState.currentSection = sectionId;
    
    // Load section-specific data
    loadSectionData(sectionId);
}

// Load section-specific data based on current section
function loadSectionData(sectionId) {
    switch(sectionId) {
        case 'walk-sheet':
            if (typeof checkAndLoadWalkSheetConfig === 'function') {
                checkAndLoadWalkSheetConfig();
            }
            break;
        case 'dashboard':
            if (typeof loadDashboardData === 'function') {
                loadDashboardData();
            }
            break;
        case 'shifts':
            if (typeof loadAdminShifts === 'function') {
                console.log('Loading shifts for admin panel...');
                loadAdminShifts();
            }
            break;
        case 'users':
            if (typeof loadUsers === 'function') {
                loadUsers();
            }
            break;
        case 'convert-data':
            // Initialize data convert event listeners when section is shown
            setTimeout(() => {
                if (typeof window.setupDataConvertEventListeners === 'function') {
                    console.log('Setting up data convert event listeners...');
                    window.setupDataConvertEventListeners();
                } else {
                    console.error('setupDataConvertEventListeners not found');
                }
            }, 100);
            break;
        case 'cuts':
            // Initialize admin cuts manager when section is shown
            setTimeout(() => {
                if (typeof window.adminCutsManager === 'object' && window.adminCutsManager.initialize) {
                    if (!window.adminCutsManager.isInitialized) {
                        console.log('Initializing admin cuts manager from showSection...');
                        window.adminCutsManager.initialize().catch(error => {
                            console.error('Failed to initialize cuts manager:', error);
                        });
                    } else {
                        console.log('Admin cuts manager already initialized');
                    }
                } else {
                    console.error('adminCutsManager not found in showSection');
                }
            }, 100);
            break;
    }
}

// Show status message
function showStatus(message, type = 'info') {
    let container = document.getElementById('status-container');
    
    // Create container if it doesn't exist
    if (!container) {
        container = document.createElement('div');
        container.id = 'status-container';
        container.className = 'status-container';
        // Ensure proper z-index even if CSS hasn't loaded
        container.style.zIndex = '12300';
        document.body.appendChild(container);
    }
    
    const messageDiv = document.createElement('div');
    messageDiv.className = `status-message ${type}`;
    messageDiv.textContent = message;
    
    // Add click to dismiss functionality
    messageDiv.addEventListener('click', () => {
        messageDiv.remove();
    });
    
    // Add a small close button for better UX
    const closeBtn = document.createElement('span');
    closeBtn.innerHTML = ' ×';
    closeBtn.style.float = 'right';
    closeBtn.style.fontWeight = 'bold';
    closeBtn.style.marginLeft = '10px';
    closeBtn.style.cursor = 'pointer';
    closeBtn.setAttribute('title', 'Click to dismiss');
    messageDiv.appendChild(closeBtn);
    
    container.appendChild(messageDiv);
    
    // Auto-remove after 5 seconds
    setTimeout(() => {
        if (messageDiv.parentNode) {
            messageDiv.remove();
        }
    }, 5000);
}

// Escape HTML
function escapeHtml(text) {
    if (text === null || text === undefined) {
        return '';
    }
    const div = document.createElement('div');
    div.textContent = String(text);
    return div.innerHTML;
}

// Debounce function for input events
function debounce(func, wait) {
    let timeout;
    return function executedFunction(...args) {
        const later = () => {
            clearTimeout(timeout);
            func(...args);
        };
        clearTimeout(timeout);
        timeout = setTimeout(later, wait);
    };
}

// Initialize the admin core when DOM is loaded
function initializeAdminCore() {
    // Set initial viewport dimensions and listen for resize events
    setAdminViewportDimensions();
    window.addEventListener('resize', setAdminViewportDimensions);
    window.addEventListener('orientationchange', () => {
        // Add a small delay for orientation change to complete
        setTimeout(setAdminViewportDimensions, 100);
    });
    
    setupNavigation();
    setupMobileMenu();
    
    // Check if URL has a hash to show specific section
    const hash = window.location.hash;
    if (hash === '#walk-sheet') {
        showSection('walk-sheet');
    } else if (hash === '#convert-data') {
        showSection('convert-data');
    } else if (hash === '#cuts') {
        showSection('cuts');
    } else {
        // Default to dashboard
        showSection('dashboard');
    }
}

// Export functions for use by other modules
window.adminCore = {
    showSection,
    showStatus,
    escapeHtml,
    debounce,
    createLocalDate,
    initializeAdminCore,
    adminAppState
};