/**
 * Rooting Future Strategy Engine v5.4
 * Main JavaScript
 */

// ============================================================================
// UTILITIES
// ============================================================================

/**
 * Make API request with JSON
 */
async function apiRequest(url, method = 'GET', data = null) {
    const options = {
        method,
        headers: {
            'Content-Type': 'application/json',
        },
    };

    if (data) {
        options.body = JSON.stringify(data);
    }

    try {
        const response = await fetch(url, options);
        const result = await response.json();

        if (!response.ok) {
            throw new Error(result.error || 'Request failed');
        }

        return result;
    } catch (error) {
        console.error('API Error:', error);
        throw error;
    }
}

/**
 * Show notification toast
 */
function showToast(message, type = 'info') {
    const toast = document.createElement('div');
    toast.className = `toast toast-${type}`;
    toast.textContent = message;

    document.body.appendChild(toast);

    // Animate in
    setTimeout(() => toast.classList.add('show'), 10);

    // Remove after 3 seconds
    setTimeout(() => {
        toast.classList.remove('show');
        setTimeout(() => toast.remove(), 300);
    }, 3000);
}

/**
 * Format date
 */
function formatDate(isoString) {
    if (!isoString) return 'N/A';
    const date = new Date(isoString);
    return date.toLocaleDateString('it-IT', {
        day: '2-digit',
        month: '2-digit',
        year: 'numeric',
        hour: '2-digit',
        minute: '2-digit',
    });
}

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

// ============================================================================
// FORM HANDLING
// ============================================================================

/**
 * Serialize form to object
 */
function serializeForm(form) {
    const formData = new FormData(form);
    const data = {};

    for (const [key, value] of formData.entries()) {
        if (data[key]) {
            if (!Array.isArray(data[key])) {
                data[key] = [data[key]];
            }
            data[key].push(value);
        } else {
            data[key] = value;
        }
    }

    return data;
}

/**
 * Validate form
 */
function validateForm(form) {
    const requiredFields = form.querySelectorAll('[required]');
    let isValid = true;

    requiredFields.forEach(field => {
        if (!field.value.trim()) {
            isValid = false;
            field.classList.add('error');
        } else {
            field.classList.remove('error');
        }
    });

    return isValid;
}

// ============================================================================
// MODAL HANDLING
// ============================================================================

/**
 * Open modal
 */
function openModal(modalId) {
    const modal = document.getElementById(modalId);
    if (modal) {
        modal.style.display = 'flex';
        document.body.style.overflow = 'hidden';
    }
}

/**
 * Close modal
 */
function closeModal(modalId) {
    const modal = document.getElementById(modalId);
    if (modal) {
        modal.style.display = 'none';
        document.body.style.overflow = '';
    }
}

// Close modal on backdrop click
document.addEventListener('click', (e) => {
    if (e.target.classList.contains('modal')) {
        e.target.style.display = 'none';
        document.body.style.overflow = '';
    }
});

// Close modal on Escape key
document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape') {
        const openModals = document.querySelectorAll('.modal[style*="flex"]');
        openModals.forEach(modal => {
            modal.style.display = 'none';
        });
        document.body.style.overflow = '';
    }
});

// ============================================================================
// SEARCH & FILTER
// ============================================================================

/**
 * Initialize live search
 */
function initLiveSearch(inputId, tableId) {
    const input = document.getElementById(inputId);
    const table = document.getElementById(tableId);

    if (!input || !table) return;

    const search = debounce(() => {
        const query = input.value.toLowerCase();
        const rows = table.querySelectorAll('tbody tr');

        rows.forEach(row => {
            const text = row.textContent.toLowerCase();
            row.style.display = text.includes(query) ? '' : 'none';
        });
    }, 300);

    input.addEventListener('input', search);
}

// ============================================================================
// LOADING STATES
// ============================================================================

/**
 * Show loading spinner on button
 */
function setButtonLoading(button, loading = true) {
    if (loading) {
        button.disabled = true;
        button.dataset.originalText = button.innerHTML;
        button.innerHTML = '<span class="spinner"></span> Caricamento...';
    } else {
        button.disabled = false;
        button.innerHTML = button.dataset.originalText || button.innerHTML;
    }
}

/**
 * Show loading overlay
 */
function showLoading(message = 'Caricamento...') {
    let overlay = document.getElementById('loadingOverlay');

    if (!overlay) {
        overlay = document.createElement('div');
        overlay.id = 'loadingOverlay';
        overlay.className = 'loading-overlay';
        overlay.innerHTML = `
            <div class="loading-content">
                <div class="spinner-large"></div>
                <p id="loadingMessage">${message}</p>
            </div>
        `;
        document.body.appendChild(overlay);
    } else {
        document.getElementById('loadingMessage').textContent = message;
        overlay.style.display = 'flex';
    }
}

/**
 * Hide loading overlay
 */
function hideLoading() {
    const overlay = document.getElementById('loadingOverlay');
    if (overlay) {
        overlay.style.display = 'none';
    }
}

// ============================================================================
// CLIPBOARD
// ============================================================================

/**
 * Copy text to clipboard
 */
async function copyToClipboard(text) {
    try {
        await navigator.clipboard.writeText(text);
        showToast('Copiato negli appunti', 'success');
    } catch (err) {
        console.error('Failed to copy:', err);
        showToast('Errore nella copia', 'error');
    }
}

// ============================================================================
// LOCAL STORAGE
// ============================================================================

/**
 * Save to local storage
 */
function saveToStorage(key, data) {
    try {
        localStorage.setItem(key, JSON.stringify(data));
    } catch (e) {
        console.error('Storage error:', e);
    }
}

/**
 * Load from local storage
 */
function loadFromStorage(key, defaultValue = null) {
    try {
        const item = localStorage.getItem(key);
        return item ? JSON.parse(item) : defaultValue;
    } catch (e) {
        console.error('Storage error:', e);
        return defaultValue;
    }
}

// ============================================================================
// INITIALIZATION
// ============================================================================

document.addEventListener('DOMContentLoaded', () => {
    // Initialize any live search fields
    initLiveSearch('searchInput', 'dataTable');

    // Auto-hide alerts after 5 seconds
    const alerts = document.querySelectorAll('.alert:not(.alert-persistent)');
    alerts.forEach(alert => {
        setTimeout(() => {
            alert.style.opacity = '0';
            setTimeout(() => alert.remove(), 300);
        }, 5000);
    });

    console.log('Rooting Future Strategy Engine v5.4 initialized');
});

// ============================================================================
// EXPORT
// ============================================================================

window.RootingFuture = {
    apiRequest,
    showToast,
    formatDate,
    openModal,
    closeModal,
    setButtonLoading,
    showLoading,
    hideLoading,
    copyToClipboard,
    saveToStorage,
    loadFromStorage,
};