// NextSnap - Polish & UX Enhancements
'use strict';

const Polish = {
    init() {
        this.setupLoadingIndicator();
        this.setupSmoothScroll();
        this.setupFormValidation();
        this.setupKeyboardShortcuts();
        this.setupOfflineDetection();
        this.setupImageLazyLoading();
        console.log('Polish enhancements loaded');
    },
    
    // Global loading indicator
    setupLoadingIndicator() {
        this.loadingBar = document.createElement('div');
        this.loadingBar.className = 'loading-bar';
        this.loadingBar.style.display = 'none';
        document.body.appendChild(this.loadingBar);
    },
    
    showLoading() {
        if (this.loadingBar) {
            this.loadingBar.style.display = 'block';
        }
    },
    
    hideLoading() {
        if (this.loadingBar) {
            this.loadingBar.style.display = 'none';
        }
    },
    
    // Smooth scroll for anchor links
    setupSmoothScroll() {
        document.querySelectorAll('a[href^="#"]').forEach(anchor => {
            anchor.addEventListener('click', (e) => {
                const href = anchor.getAttribute('href');
                if (href === '#') return;
                
                e.preventDefault();
                const target = document.querySelector(href);
                if (target) {
                    target.scrollIntoView({
                        behavior: 'smooth',
                        block: 'start'
                    });
                }
            });
        });
    },
    
    // Enhanced form validation
    setupFormValidation() {
        document.querySelectorAll('form').forEach(form => {
            form.addEventListener('submit', (e) => {
                const invalidInputs = form.querySelectorAll(':invalid');
                if (invalidInputs.length > 0) {
                    invalidInputs[0].focus();
                    this.shake(invalidInputs[0]);
                }
            });
        });
        
        // Real-time validation feedback
        document.querySelectorAll('input[required], textarea[required]').forEach(input => {
            input.addEventListener('blur', () => {
                if (!input.validity.valid) {
                    this.shake(input);
                }
            });
        });
    },
    
    // Shake animation for errors
    shake(element) {
        element.style.animation = 'inputShake 0.3s';
        setTimeout(() => {
            element.style.animation = '';
        }, 300);
    },
    
    // Keyboard shortcuts
    setupKeyboardShortcuts() {
        document.addEventListener('keydown', (e) => {
            // Alt+1: Go to capture
            if (e.altKey && e.key === '1') {
                e.preventDefault();
                window.location.href = '/capture';
            }
            
            // Alt+2: Go to queue
            if (e.altKey && e.key === '2') {
                e.preventDefault();
                window.location.href = '/queue';
            }
            
            // Alt+3: Go to files
            if (e.altKey && e.key === '3') {
                e.preventDefault();
                window.location.href = '/browser';
            }
            
            // Alt+R: Refresh/sync
            if (e.altKey && e.key === 'r') {
                e.preventDefault();
                if (window.SyncEngine && window.SyncEngine.triggerSync) {
                    window.SyncEngine.triggerSync();
                }
            }
        });
    },
    
    // Enhanced offline detection
    setupOfflineDetection() {
        let wasOffline = !navigator.onLine;
        
        window.addEventListener('online', () => {
            if (wasOffline) {
                this.showToast('✓ Back online', 'success', 2000);
                wasOffline = false;
            }
        });
        
        window.addEventListener('offline', () => {
            this.showToast('⚠️ You are offline', 'warning', 3000);
            wasOffline = true;
        });
    },
    
    // Lazy loading for images
    setupImageLazyLoading() {
        if ('IntersectionObserver' in window) {
            const imageObserver = new IntersectionObserver((entries) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        const img = entry.target;
                        if (img.dataset.src) {
                            img.src = img.dataset.src;
                            img.removeAttribute('data-src');
                            imageObserver.unobserve(img);
                        }
                    }
                });
            });
            
            document.querySelectorAll('img[data-src]').forEach(img => {
                imageObserver.observe(img);
            });
        }
    },
    
    // Toast notification helper
    showToast(message, type = 'info', duration = 3000) {
        let toast = document.getElementById('global-toast');
        
        if (!toast) {
            toast = document.createElement('div');
            toast.id = 'global-toast';
            toast.className = 'toast';
            document.body.appendChild(toast);
        }
        
        toast.textContent = message;
        toast.className = `toast ${type}`;
        toast.style.display = 'block';
        
        setTimeout(() => {
            toast.style.display = 'none';
        }, duration);
    },
    
    // Confirm dialog with better UX
    async confirm(message, title = 'Confirm') {
        return new Promise((resolve) => {
            const modal = this.createConfirmModal(message, title);
            document.body.appendChild(modal);
            
            modal.querySelector('.confirm-yes').onclick = () => {
                document.body.removeChild(modal);
                resolve(true);
            };
            
            modal.querySelector('.confirm-no').onclick = () => {
                document.body.removeChild(modal);
                resolve(false);
            };
            
            modal.onclick = (e) => {
                if (e.target === modal) {
                    document.body.removeChild(modal);
                    resolve(false);
                }
            };
        });
    },
    
    createConfirmModal(message, title) {
        const modal = document.createElement('div');
        modal.className = 'modal';
        modal.innerHTML = `
            <div class="modal-content">
                <h3>${this.escapeHtml(title)}</h3>
                <p>${this.escapeHtml(message)}</p>
                <div class="modal-actions">
                    <button class="btn btn-secondary confirm-no">Cancel</button>
                    <button class="btn btn-primary confirm-yes">Confirm</button>
                </div>
            </div>
        `;
        return modal;
    },
    
    // Copy to clipboard with feedback
    async copyToClipboard(text) {
        try {
            await navigator.clipboard.writeText(text);
            this.showToast('✓ Copied to clipboard', 'success', 1500);
            return true;
        } catch (err) {
            this.showToast('❌ Failed to copy', 'error', 2000);
            return false;
        }
    },
    
    // Debounce helper
    debounce(func, wait) {
        let timeout;
        return function executedFunction(...args) {
            const later = () => {
                clearTimeout(timeout);
                func(...args);
            };
            clearTimeout(timeout);
            timeout = setTimeout(later, wait);
        };
    },
    
    // Throttle helper
    throttle(func, limit) {
        let inThrottle;
        return function(...args) {
            if (!inThrottle) {
                func.apply(this, args);
                inThrottle = true;
                setTimeout(() => inThrottle = false, limit);
            }
        };
    },
    
    // Escape HTML
    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    },
    
    // Format file size
    formatFileSize(bytes) {
        if (bytes === 0) return '0 Bytes';
        const k = 1024;
        const sizes = ['Bytes', 'KB', 'MB', 'GB'];
        const i = Math.floor(Math.log(bytes) / Math.log(k));
        return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
    },
    
    // Format date relative
    formatRelativeTime(date) {
        const now = new Date();
        const diffMs = now - date;
        const diffSecs = Math.floor(diffMs / 1000);
        const diffMins = Math.floor(diffSecs / 60);
        const diffHours = Math.floor(diffMins / 60);
        const diffDays = Math.floor(diffHours / 24);
        
        if (diffSecs < 60) return 'just now';
        if (diffMins < 60) return `${diffMins} min ago`;
        if (diffHours < 24) return `${diffHours} hour${diffHours > 1 ? 's' : ''} ago`;
        if (diffDays < 7) return `${diffDays} day${diffDays > 1 ? 's' : ''} ago`;
        return date.toLocaleDateString();
    },
    
    // Vibrate if supported (for mobile feedback)
    vibrate(pattern = 50) {
        if ('vibrate' in navigator) {
            navigator.vibrate(pattern);
        }
    }
};

// Initialize on DOM ready
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => Polish.init());
} else {
    Polish.init();
}

// Make Polish globally available
window.Polish = Polish;