class Utils {
    static async loadJSON(filePath) {
        try {
            const response = await fetch(filePath);
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }
            const data = await response.json();
            return data;
        } catch (error) {
            console.error(`Error loading JSON from ${filePath}:`, error);
            return null;
        }
    }

    static saveToLocalStorage(key, data) {
        try {
            localStorage.setItem(key, JSON.stringify(data));
            return true;
        } catch (error) {
            console.error('Error saving to localStorage:', error);
            return false;
        }
    }

    static loadFromLocalStorage(key) {
        try {
            const data = localStorage.getItem(key);
            return data ? JSON.parse(data) : null;
        } catch (error) {
            console.error('Error loading from localStorage:', error);
            return null;
        }
    }

    static generateId() {
        return Date.now().toString(36) + Math.random().toString(36).substr(2);
    }

    static formatTime(seconds) {
        const minutes = Math.floor(seconds / 60);
        const remainingSeconds = seconds % 60;
        return `${minutes}:${remainingSeconds.toString().padStart(2, '0')}`;
    }

    static sanitizeHTML(str) {
        const div = document.createElement('div');
        div.textContent = str;
        return div.innerHTML;
    }

    static debounce(func, wait) {
        let timeout;
        return function executedFunction(...args) {
            const later = () => {
                clearTimeout(timeout);
                func(...args);
            };
            clearTimeout(timeout);
            timeout = setTimeout(later, wait);
        };
    }

    static validateEmail(email) {
        const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        return re.test(email);
    }

    static validatePassword(password) {
        return password.length >= 6;
    }

    static calculatePercentage(part, total) {
        if (total === 0) return 0;
        return Math.round((part / total) * 100);
    }

    static getCurrentDate() {
        return new Date().toISOString().split('T')[0];
    }

    static formatNumber(num) {
        return new Intl.NumberFormat('fa-IR').format(num);
    }

    static shuffleArray(array) {
        const shuffled = [...array];
        for (let i = shuffled.length - 1; i > 0; i--) {
            const j = Math.floor(Math.random() * (i + 1));
            [shuffled[i], shuffled[j]] = [shuffled[j], shuffled[i]];
        }
        return shuffled;
    }

    static isMobileDevice() {
        return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
    }

    static async copyToClipboard(text) {
        try {
            await navigator.clipboard.writeText(text);
            return true;
        } catch (error) {
            console.error('Failed to copy text:', error);
            return false;
        }
    }

    static showNotification(message, type = 'info') {
        const notification = document.createElement('div');
        notification.className = `notification notification-${type}`;
        notification.innerHTML = `
            <div class="notification-content">
                <span class="notification-message">${this.sanitizeHTML(message)}</span>
                <button class="notification-close">&times;</button>
            </div>
        `;

        notification.style.cssText = `
            position: fixed;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: ${type === 'error' ? '#fed7d7' : type === 'success' ? '#c6f6d5' : '#bee3f8'};
            color: ${type === 'error' ? '#742a2a' : type === 'success' ? '#22543d' : '#2a4365'};
            padding: 12px 20px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            z-index: 1000;
            animation: slideDown 0.3s ease-out;
        `;

        document.body.appendChild(notification);

        notification.querySelector('.notification-close').addEventListener('click', () => {
            notification.remove();
        });

        setTimeout(() => {
            if (notification.parentNode) {
                notification.remove();
            }
        }, 5000);
    }
}

// اضافه کردن استایل برای نوتیفیکیشن
const notificationStyles = `
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.notification-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
}

.notification-close {
    background: none;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}
`;

// تزریق استایل‌ها به صفحه
if (!document.querySelector('#notification-styles')) {
    const styleElement = document.createElement('style');
    styleElement.id = 'notification-styles';
    styleElement.textContent = notificationStyles;
    document.head.appendChild(styleElement);
}