/**
 * LiveComponent Client-Side Implementation
 *
 * Handles:
 * - Component initialization and lifecycle
 * - AJAX action dispatching
 * - Server-sent events from component updates
 * - Polling for Pollable components
 * - Event-driven component-to-component communication
 * - Fragment-based partial rendering with DOM patching
 * - Real-time SSE updates for reactive components
 */

import { domPatcher } from './DomPatcher.js';
import { SseClient } from '../sse/index.js';
import { LazyComponentLoader } from './LazyComponentLoader.js';
import { NestedComponentHandler } from './NestedComponentHandler.js';
import { ComponentPlayground } from './ComponentPlayground.js';
import { ComponentFileUploader } from './ComponentFileUploader.js';
import { FileUploadWidget } from './FileUploadWidget.js';
import { optimisticStateManager } from './OptimisticStateManager.js';
import { accessibilityManager } from './AccessibilityManager.js';
import { ErrorBoundary } from './ErrorBoundary.js';
import { RequestDeduplicator } from './RequestDeduplicator.js';
import * as StateSerializer from './StateSerializer.js';

class LiveComponentManager {
    constructor() {
        this.components = new Map();
        this.eventHandlers = new Map();
        this.debounceTimers = new Map();
        this.domPatcher = domPatcher;
        this.accessibilityManager = accessibilityManager;
        // Note: No global CSRF token - each component has its own token

        // SSE Integration
        this.sseClients = new Map(); // channel → SseClient
        this.componentChannels = new Map(); // componentId → channel

        // Lazy Loading Integration
        this.lazyLoader = null; // Initialized in init() or initLazyLoading()

        // Nested Components Integration
        this.nestedHandler = null; // Initialized in initNestedComponents()

        // DevTools Integration
        this.devTools = null; // Will be set by DevTools when available

        // Error Handling
        this.errorBoundary = new ErrorBoundary(this);

        // Request Deduplication
        this.requestDeduplicator = new RequestDeduplicator();
        
        // Shared Configuration
        this.config = sharedConfig;

        // Tooltip Manager
        this.tooltipManager = tooltipManager;

        // Action Loading Manager
        this.actionLoadingManager = actionLoadingManager;

        // UI Helper
        this.uiHelper = new LiveComponentUIHelper(this);

        // Loading State Manager
        this.loadingStateManager = new LoadingStateManager(
            this.actionLoadingManager,
            optimisticStateManager
        );
    }

    /**
     * Enable DevTools integration
     * Called by LiveComponentDevTools during initialization
     */
    enableDevTools(devToolsInstance) {
        this.devTools = devToolsInstance;
        console.log('[LiveComponent] DevTools integration enabled');
    }

    /**
     * Log action to DevTools if enabled
     */
    logActionToDevTools(componentId, actionName, params, startTime, endTime, success, error = null) {
        if (!this.devTools) return;

        this.devTools.logAction(componentId, actionName, params, startTime, endTime, success, error);
    }

    /**
     * Log event to DevTools if enabled
     */
    logEventToDevTools(eventName, data, source = 'server') {
        if (!this.devTools) return;

        this.devTools.logEvent(eventName, data, source);
    }

    /**
     * Initialize Lazy Loading system
     * Should be called once during application startup
     */
    initLazyLoading() {
        if (this.lazyLoader) {
            console.warn('[LiveComponent] Lazy loading already initialized');
            return;
        }

        this.lazyLoader = new LazyComponentLoader(this);
        this.lazyLoader.init();

        console.log('[LiveComponent] Lazy loading system initialized');
    }

    /**
     * Initialize Nested Components system
     * Should be called once during application startup
     */
    initNestedComponents() {
        if (this.nestedHandler) {
            console.warn('[LiveComponent] Nested components already initialized');
            return;
        }

        this.nestedHandler = new NestedComponentHandler(this);
        this.nestedHandler.init();

        console.log('[LiveComponent] Nested components system initialized');
    }

    /**
     * Initialize LiveComponent
     */
    init(element) {
        const componentId = element.dataset.liveComponent;
        if (!componentId) return;

        const config = {
            id: componentId,
            element,
            pollInterval: parseInt(element.dataset.pollInterval) || null,
            pollTimer: null,
            observer: null
        };

        this.components.set(componentId, config);

        // Setup action handlers
        this.setupActionHandlers(element);

        // Setup file upload handlers
        this.setupFileUploadHandlers(element);

        // Setup polling if component is pollable
        if (config.pollInterval) {
            this.startPolling(componentId);
        }

        // Setup lifecycle observer for onDestroy hook
        this.setupLifecycleObserver(element, componentId);

        // Setup SSE connection if component has a channel
        this.setupSseConnection(element, componentId);

        // Setup accessibility features
        this.setupAccessibility(componentId, element);

        // Initialize tooltips for component
        this.tooltipManager.initComponent(element);

        console.log(`[LiveComponent] Initialized: ${componentId}`);
    }

    /**
     * Setup accessibility features for component
     */
    setupAccessibility(componentId, element) {
        // Create component-specific ARIA live region
        const politeness = element.dataset.livePolite === 'assertive' ? 'assertive' : 'polite';
        this.accessibilityManager.createComponentLiveRegion(componentId, element, politeness);

        console.log(`[LiveComponent] Accessibility features enabled for ${componentId}`);
    }

    /**
     * Setup MutationObserver to detect component removal from DOM
     * Calls onDestroy() lifecycle hook on server when component is removed
     */
    setupLifecycleObserver(element, componentId) {
        const config = this.components.get(componentId);
        if (!config) return;

        // Create observer to watch for element removal
        const observer = new MutationObserver((mutations) => {
            // Check if element is no longer in DOM
            if (!document.contains(element)) {
                console.log(`[LiveComponent] Element removed from DOM: ${componentId}`);
                this.callDestroyHook(componentId);
                observer.disconnect();
            }
        });

        // Observe parent node for childList changes
        if (element.parentNode) {
            observer.observe(element.parentNode, {
                childList: true,
                subtree: false
            });
        }

        config.observer = observer;
    }

    /**
     * Setup SSE connection for component
     * Automatically connects to SSE if component has data-sse-channel attribute
     */
    setupSseConnection(element, componentId) {
        // Check if component has SSE channel
        const sseChannel = element.dataset.sseChannel;
        if (!sseChannel) {
            return; // No SSE channel, skip
        }

        console.log(`[LiveComponent] Setting up SSE for ${componentId} on channel: ${sseChannel}`);

        // Track component-channel mapping
        this.componentChannels.set(componentId, sseChannel);

        // Get or create SSE client for this channel
        let sseClient = this.sseClients.get(sseChannel);
        if (!sseClient) {
            // Create new SSE client for this channel
            sseClient = new SseClient([sseChannel], {
                autoReconnect: true,
                heartbeatTimeout: 45000
            });

            // Register global handlers for this channel
            this.registerSseHandlers(sseClient, sseChannel);

            // Connect
            sseClient.connect();

            this.sseClients.set(sseChannel, sseClient);
            console.log(`[LiveComponent] Created SSE client for channel: ${sseChannel}`);
        }

        console.log(`[LiveComponent] SSE connection established for ${componentId}`);
    }

    /**
     * Register SSE event handlers for a channel
     */
    registerSseHandlers(sseClient, channel) {
        // Handle component-update events
        sseClient.on('component-update', (data) => {
            this.handleSseComponentUpdate(data, channel);
        });

        // Handle component-fragments events
        sseClient.on('component-fragments', (data) => {
            this.handleSseComponentFragments(data, channel);
        });

        // Handle connection state changes
        sseClient.on('connected', () => {
            console.log(`[LiveComponent] SSE connected to channel: ${channel}`);
            this.updateSseConnectionStatus(channel, 'connected');
        });

        sseClient.on('disconnected', () => {
            console.log(`[LiveComponent] SSE disconnected from channel: ${channel}`);
            this.updateSseConnectionStatus(channel, 'disconnected');
        });

        sseClient.on('reconnecting', (attempt) => {
            console.log(`[LiveComponent] SSE reconnecting to channel ${channel} (attempt ${attempt})`);
            this.updateSseConnectionStatus(channel, 'reconnecting');
        });

        sseClient.on('error', (error) => {
            console.error(`[LiveComponent] SSE error on channel ${channel}:`, error);
            this.updateSseConnectionStatus(channel, 'error');
        });
    }

    /**
     * Handle SSE component-update event
     */
    handleSseComponentUpdate(data, channel) {
        const { componentId, state, html, events } = data;

        console.log(`[LiveComponent] SSE update for ${componentId}:`, { state, html, events });

        const config = this.components.get(componentId);
        if (!config) {
            console.warn(`[LiveComponent] Received SSE update for unknown component: ${componentId}`);
            return;
        }

        try {
            // Capture focus before update
            this.accessibilityManager.captureFocusState(componentId, config.element);

            // Update full HTML if provided
            if (html) {
                config.element.innerHTML = html;
                this.setupActionHandlers(config.element);
                this.setupFileUploadHandlers(config.element);
            }

            // Update state using StateSerializer
            if (state) {
                StateSerializer.setStateOnElement(config.element, state);
            }

            // Restore focus after update
            this.accessibilityManager.restoreFocus(componentId, config.element);

            // Announce update to screen readers
            this.accessibilityManager.announceUpdate(componentId, 'full');

            // Dispatch events
            if (events && Array.isArray(events)) {
                this.handleServerEvents(events);
            }

            console.log(`[LiveComponent] SSE update applied to ${componentId}`);

        } catch (error) {
            console.error(`[LiveComponent] Failed to apply SSE update for ${componentId}:`, error);
        }
    }

    /**
     * Handle SSE component-fragments event
     */
    handleSseComponentFragments(data, channel) {
        const { componentId, fragments } = data;

        console.log(`[LiveComponent] SSE fragments for ${componentId}:`, fragments);

        const config = this.components.get(componentId);
        if (!config) {
            console.warn(`[LiveComponent] Received SSE fragments for unknown component: ${componentId}`);
            return;
        }

        try {
            // Update fragments using DOM patcher
            this.updateFragments(config.element, fragments);

            console.log(`[LiveComponent] SSE fragments applied to ${componentId}`);

        } catch (error) {
            console.error(`[LiveComponent] Failed to apply SSE fragments for ${componentId}:`, error);
        }
    }

    /**
     * Update SSE connection status indicators
     */
    updateSseConnectionStatus(channel, status) {
        // Find all components on this channel
        this.componentChannels.forEach((componentChannel, componentId) => {
            if (componentChannel === channel) {
                const config = this.components.get(componentId);
                if (!config) return;

                // Update status attribute
                config.element.dataset.sseStatus = status;

                // Dispatch custom event for status change
                config.element.dispatchEvent(new CustomEvent('livecomponent:sse:status', {
                    detail: { channel, status }
                }));
            }
        });
    }

    /**
     * Call onDestroy() lifecycle hook on server
     * Uses navigator.sendBeacon for best-effort delivery even during page unload
     */
    async callDestroyHook(componentId) {
        const config = this.components.get(componentId);
        if (!config) return;

        try {
            // Get current state
            const stateJson = config.element.dataset.state || '{}';
            const state = JSON.parse(stateJson);

            // Get CSRF token
            const csrfToken = config.element.dataset.csrfToken;

            const payload = JSON.stringify({
                state,
                _csrf_token: csrfToken
            });

            // Try sendBeacon first for better reliability during page unload
            const url = `/live-component/${componentId}/destroy`;
            const blob = new Blob([payload], { type: 'application/json' });

            if (navigator.sendBeacon && navigator.sendBeacon(url, blob)) {
                console.log(`[LiveComponent] onDestroy() called via sendBeacon: ${componentId}`);
            } else {
                // Fallback to fetch for normal removal
                await fetch(url, {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                        'X-Requested-With': 'XMLHttpRequest'
                    },
                    body: payload
                });
                console.log(`[LiveComponent] onDestroy() called via fetch: ${componentId}`);
            }
        } catch (error) {
            // Don't throw - component is being destroyed anyway
            console.warn(`[LiveComponent] onDestroy() hook failed: ${componentId}`, error);
        }

        // Clean up local state
        this.destroy(componentId);
    }

    /**
     * Setup action click handlers
     */
    setupActionHandlers(element) {
        element.querySelectorAll('[data-live-action]').forEach(actionEl => {
            // Handle form submissions
            if (actionEl.tagName === 'FORM') {
                actionEl.addEventListener('submit', async (e) => {
                    e.preventDefault();

                    const componentId = element.dataset.liveComponent;
                    const action = actionEl.dataset.liveAction;

                    // Collect all form values
                    const formValues = {};
                    const formData = new FormData(actionEl);
                    for (const [key, value] of formData.entries()) {
                        formValues[key] = value;
                    }

                    // Extract fragments for partial rendering
                    const fragments = this.extractFragments(actionEl);

                    await this.executeAction(componentId, action, formValues, fragments);
                });
            }
            // Handle input elements with debouncing
            else if (actionEl.tagName === 'INPUT' || actionEl.tagName === 'TEXTAREA' || actionEl.tagName === 'SELECT') {
                // Default debounce for text inputs: 300ms, others: 0ms
                const defaultDebounce = (actionEl.type === 'text' || actionEl.type === 'email' || actionEl.type === 'url' || actionEl.type === 'tel' || actionEl.tagName === 'TEXTAREA') ? 300 : 0;
                const debounceMs = parseInt(actionEl.dataset.liveDebounce) ?? defaultDebounce;

                actionEl.addEventListener('input', async (e) => {
                    const componentId = element.dataset.liveComponent;
                    const action = actionEl.dataset.liveAction;
                    const params = this.extractParams(actionEl);

                    // Add input value to params
                    if (actionEl.type === 'checkbox') {
                        params[actionEl.name || 'value'] = actionEl.checked ? 'yes' : 'no';
                    } else if (actionEl.type === 'radio') {
                        params[actionEl.name || 'value'] = actionEl.value;
                    } else {
                        params[actionEl.name || 'value'] = actionEl.value;
                    }

                    // Extract fragments for partial rendering
                    const fragments = this.extractFragments(actionEl);

                    if (debounceMs > 0) {
                        this.debouncedAction(componentId, action, params, debounceMs, fragments);
                    } else {
                        await this.executeAction(componentId, action, params, fragments);
                    }
                });

                // For radio buttons and checkboxes, also listen to 'change' event
                if (actionEl.type === 'radio' || actionEl.type === 'checkbox') {
                    actionEl.addEventListener('change', async (e) => {
                        const componentId = element.dataset.liveComponent;
                        const action = actionEl.dataset.liveAction;
                        const params = this.extractParams(actionEl);

                        if (actionEl.type === 'checkbox') {
                            params[actionEl.name || 'value'] = actionEl.checked ? 'yes' : 'no';
                        } else if (actionEl.type === 'radio') {
                            params[actionEl.name || 'value'] = actionEl.value;
                        }

                        await this.executeAction(componentId, action, params);
                    });
                }
            } else {
                // Handle button clicks
                actionEl.addEventListener('click', async (e) => {
                    e.preventDefault();

                    const componentId = element.dataset.liveComponent;
                    const action = actionEl.dataset.liveAction;
                    let params = this.extractParams(actionEl);

                    // For submit/navigation actions, collect all form values
                    if (action === 'submit' || action === 'nextStep' || action === 'previousStep') {
                        const formValues = this.collectFormValues(element);
                        console.log('[LiveComponent] Collected form values:', formValues);
                        params = { ...formValues, ...params };
                        console.log('[LiveComponent] Final params:', params);
                    }

                    // Extract fragments for partial rendering
                    const fragments = this.extractFragments(actionEl);

                    await this.executeAction(componentId, action, params, fragments);
                });
            }
        });
    }

    /**
     * Debounced action execution
     */
    debouncedAction(componentId, action, params, delay, fragments = null) {
        const timerKey = `${componentId}_${action}`;

        // Clear existing timer
        if (this.debounceTimers.has(timerKey)) {
            clearTimeout(this.debounceTimers.get(timerKey));
        }

        // Set new timer
        const timer = setTimeout(async () => {
            await this.executeAction(componentId, action, params, fragments);
            this.debounceTimers.delete(timerKey);
        }, delay);

        this.debounceTimers.set(timerKey, timer);
    }

    /**
     * Extract action parameters from element
     */
    extractParams(element) {
        const params = {};

        // Extract data-param-* attributes
        Object.keys(element.dataset).forEach(key => {
            if (key.startsWith('param')) {
                // Remove 'param' prefix and handle '-from' suffix
                const paramKey = key.replace('param', '');

                // Check if this is a -from parameter (e.g., data-param-field-from="value")
                if (paramKey.endsWith('From')) {
                    // Extract parameter name (e.g., "fieldFrom" -> "field")
                    const paramName = paramKey.replace(/From$/, '').toLowerCase();
                    const fromAttribute = element.dataset[key]; // e.g., "value"

                    // Get value from the specified attribute
                    if (fromAttribute === 'value') {
                        params[paramName] = element.value;
                    } else {
                        params[paramName] = element[fromAttribute] || element.getAttribute(fromAttribute);
                    }
                } else {
                    // Regular parameter (e.g., data-param-direction="desc")
                    const paramName = paramKey.toLowerCase();
                    params[paramName] = element.dataset[key];
                }
            }
        });

        return params;
    }

    /**
     * Extract fragments from element
     *
     * Gets fragments to update from data-lc-fragments attribute.
     * Format: data-lc-fragments="user-stats,recent-activity"
     *
     * @param {HTMLElement} element - Action element
     * @returns {Array<string>|null} - Array of fragment names or null
     */
    extractFragments(element) {
        const fragmentsAttr = element.dataset.lcFragments;

        if (!fragmentsAttr) {
            return null;
        }

        // Split by comma and trim whitespace
        return fragmentsAttr.split(',').map(name => name.trim()).filter(Boolean);
    }

    /**
     * Collect all form input values from component
     */
    collectFormValues(element) {
        const values = {};

        // Find all inputs, textareas, and selects within the component
        const inputs = element.querySelectorAll('input, textarea, select');

        inputs.forEach(input => {
            const name = input.name;
            if (!name) return; // Skip inputs without name

            if (input.type === 'checkbox') {
                values[name] = input.checked ? 'yes' : 'no';
            } else if (input.type === 'radio') {
                if (input.checked) {
                    values[name] = input.value;
                }
            } else {
                values[name] = input.value;
            }
        });

        return values;
    }

    /**
     * Execute component action
     *
     * @param {string} componentId - Component ID
     * @param {string} method - Action method name
     * @param {Object} params - Action parameters
     * @param {Array<string>} fragments - Optional fragment names for partial rendering
     */
    async executeAction(componentId, method, params = {}, fragments = null) {
        const config = this.components.get(componentId);
        if (!config) {
            console.error(`[LiveComponent] Unknown component: ${componentId}`);
            return;
        }

        // Check for pending duplicate request
        const pendingRequest = this.requestDeduplicator.getPendingRequest(componentId, method, params);
        if (pendingRequest) {
            console.log(`[LiveComponent] Deduplicating request: ${componentId}.${method}`);
            return await pendingRequest;
        }

        // Check for cached result
        const cachedResult = this.requestDeduplicator.getCachedResult(componentId, method, params);
        if (cachedResult) {
            console.log(`[LiveComponent] Using cached result: ${componentId}.${method}`);
            return cachedResult;
        }

        let operationId = null;
        const startTime = performance.now();

        // Show loading state (uses LoadingStateManager for configurable indicators)
        const loadingConfig = this.loadingStateManager.getConfig(componentId);
        this.loadingStateManager.showLoading(componentId, config.element, {
            fragments,
            type: loadingConfig.type,
            optimistic: true // Check optimistic UI first
        });

        // Create request promise
        const requestPromise = (async () => {
            try {
            // Get current state from element using StateSerializer
            const stateWrapper = StateSerializer.getStateFromElement(config.element) || {
                id: componentId,
                component: '',
                data: {},
                version: 1
            };

            // Extract actual state data from wrapper format
            // Wrapper format: {id, component, data, version}
            // Server expects just the data object
            const state = stateWrapper.data || {};

            // Apply optimistic update for immediate UI feedback
            // This updates the UI before server confirmation
            const optimisticState = optimisticStateManager.applyOptimisticUpdate(
                componentId,
                stateWrapper,
                (currentState) => {
                    // Optimistic update function - predict state changes
                    // For now, we just mark that an operation is pending
                    // Component-specific logic could predict actual changes
                    return {
                        ...currentState,
                        data: {
                            ...currentState.data,
                            _optimistic: true
                        }
                    };
                },
                { action: method, params }
            );

            operationId = optimisticStateManager.getPendingOperations(componentId)[0]?.id;

            // Get component-specific CSRF token from element
            const csrfToken = config.element.dataset.csrfToken;
            if (!csrfToken) {
                console.error(`[LiveComponent] Missing CSRF token for component: ${componentId}`);
                throw new Error('CSRF token is required for component actions');
            }

            // Build request body
            const requestBody = {
                method,
                params,
                state,
                _csrf_token: csrfToken
            };

            // Add fragments parameter if specified
            if (fragments && Array.isArray(fragments) && fragments.length > 0) {
                requestBody.fragments = fragments;
            }

            // Send AJAX request with CSRF token in body
            // Component ID is in the URL, not in the body
            const response = await fetch(`/live-component/${componentId}`, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'X-Requested-With': 'XMLHttpRequest'
                },
                body: JSON.stringify(requestBody)
            });

            if (!response.ok) {
                const errorText = await response.text();
                console.error('[LiveComponent] Server error response:', errorText);
                throw new Error(`HTTP ${response.status}: ${response.statusText}`);
            }

            const responseText = await response.text();
            console.log('[LiveComponent] Raw response:', responseText.substring(0, 200));

            let data;
            try {
                data = JSON.parse(responseText);
            } catch (parseError) {
                console.error('[LiveComponent] JSON parse error:', parseError);
                console.error('[LiveComponent] Response text:', responseText);
                throw new Error(`Failed to parse JSON response: ${parseError.message}`);
            }

            // Check for version conflict
            const serverState = data.state || {};
            const currentVersion = stateWrapper.version || 1;
            const serverVersion = serverState.version || 1;

            if (serverVersion !== currentVersion + 1) {
                // Version conflict detected - server rejected our optimistic update
                console.warn(`[LiveComponent] Version conflict: expected ${currentVersion + 1}, got ${serverVersion}`);

                // Handle conflict via OptimisticStateManager
                if (operationId) {
                    const conflictResolution = optimisticStateManager.handleConflict(
                        componentId,
                        operationId,
                        serverState,
                        { expectedVersion: currentVersion + 1, actualVersion: serverVersion }
                    );

                    // Show conflict notification to user
                    if (conflictResolution.notification) {
                        this.showConflictNotification(componentId, conflictResolution.notification);
                    }

                    // Use server state (rollback)
                    data.state = conflictResolution.state;
                }
            } else {
                // Success - confirm optimistic operation
                if (operationId) {
                    optimisticStateManager.confirmOperation(componentId, operationId, serverState);
                }
            }

            // Handle fragment-based response (partial rendering)
            if (data.fragments) {
                this.updateFragments(config.element, data.fragments);
            }
            // Handle full HTML response (fallback or no fragments requested)
            else if (data.html) {
                config.element.innerHTML = data.html;
                this.setupActionHandlers(config.element);
            }

            // Re-initialize tooltips after DOM update
            this.tooltipManager.initComponent(config.element);

            // Update component state using StateSerializer
            if (data.state) {
                StateSerializer.setStateOnElement(config.element, data.state);
            }

            // Handle server events
            if (data.events && data.events.length > 0) {
                this.handleServerEvents(data.events);
            }

            console.log(`[LiveComponent] Action executed: ${componentId}.${method}`, data);

                // Log successful action to DevTools
                const endTime = performance.now();
                this.logActionToDevTools(componentId, method, params, startTime, endTime, true);

                // Cache successful result
                this.requestDeduplicator.cacheResult(componentId, method, params, data);

                // Hide loading state
                this.loadingStateManager.hideLoading(componentId);

                return data;

            } catch (error) {
                console.error(`[LiveComponent] Action failed:`, error);

                // Log failed action to DevTools
                const endTime = performance.now();
                this.logActionToDevTools(componentId, method, params, startTime, endTime, false, error.message);

                // Rollback optimistic update on error
                if (operationId) {
                    const snapshot = optimisticStateManager.getSnapshot(componentId);
                    if (snapshot) {
                        StateSerializer.setStateOnElement(config.element, snapshot);
                        optimisticStateManager.clearPendingOperations(componentId);
                        optimisticStateManager.clearSnapshot(componentId);
                    }
                }

                // Hide loading state on error
                this.loadingStateManager.hideLoading(componentId);

                // Handle error via ErrorBoundary
                await this.errorBoundary.handleError(componentId, method, error, {
                    params,
                    fragments
                });

                throw error;
            }
        })();

        // Register pending request for deduplication
        return this.requestDeduplicator.registerPendingRequest(componentId, method, params, requestPromise);
    }

    /**
     * Update specific fragments using DOM patching
     *
     * Efficiently patches only the fragments that changed.
     * Includes accessibility features: focus management and ARIA announcements.
     *
     * @param {HTMLElement} container - Component container element
     * @param {Object.<string, string>} fragments - Map of fragment names to HTML
     */
    updateFragments(container, fragments) {
        const componentId = container.dataset.liveComponent;

        // Capture focus state before patching (with data-lc-keep-focus support)
        if (componentId) {
            this.accessibilityManager.captureFocusState(componentId, container);
        }

        // Patch each fragment
        const results = this.domPatcher.patchFragments(container, fragments);

        // Restore focus after patching (respects data-lc-keep-focus)
        if (componentId) {
            this.accessibilityManager.restoreFocus(componentId, container);
        }

        // Re-setup action handlers for patched fragments
        Object.keys(fragments).forEach(fragmentName => {
            if (results[fragmentName]) {
                const fragmentElement = container.querySelector(`[data-lc-fragment="${fragmentName}"]`);
                if (fragmentElement) {
                    this.setupActionHandlers(fragmentElement);
                }
            }
        });

        // Announce update to screen readers
        if (componentId) {
            const fragmentNames = Object.keys(fragments).filter(name => results[name]);
            if (fragmentNames.length > 0) {
                this.accessibilityManager.announceUpdate(componentId, 'fragment', {
                    fragmentName: fragmentNames.join(', ')
                });
            }
        }

        // Log patching results
        const successCount = Object.values(results).filter(Boolean).length;
        console.log(`[LiveComponent] Patched ${successCount}/${Object.keys(fragments).length} fragments`, results);
    }

    /**
     * Handle server-sent events
     */
    handleServerEvents(events) {
        events.forEach(event => {
            const { name, payload, target } = event;

            console.log(`[LiveComponent] Server event:`, { name, payload, target });

            // Log event to DevTools
            this.logEventToDevTools(name, { payload, target }, 'server');

            if (target) {
                // Targeted event - only for specific component
                this.dispatchToComponent(target, name, payload);
            } else {
                // Broadcast event - to all listening components
                this.broadcast(name, payload);
            }
        });
    }

    /**
     * Dispatch event to specific component
     */
    dispatchToComponent(targetComponentId, eventName, payload) {
        const handlers = this.eventHandlers.get(eventName) || [];

        handlers.forEach(handler => {
            if (handler.componentId === targetComponentId) {
                handler.callback(payload);
            }
        });
    }

    /**
     * Broadcast event to all listeners
     */
    broadcast(eventName, payload) {
        const handlers = this.eventHandlers.get(eventName) || [];

        handlers.forEach(handler => {
            handler.callback(payload);
        });

        // Also dispatch as custom DOM event
        document.dispatchEvent(new CustomEvent(`livecomponent:${eventName}`, {
            detail: payload
        }));
    }

    /**
     * Register event listener
     */
    on(componentId, eventName, callback) {
        if (!this.eventHandlers.has(eventName)) {
            this.eventHandlers.set(eventName, []);
        }

        this.eventHandlers.get(eventName).push({
            componentId,
            callback
        });

        console.log(`[LiveComponent] Event listener registered: ${componentId} -> ${eventName}`);
    }

    /**
     * Start polling for component
     */
    startPolling(componentId) {
        const config = this.components.get(componentId);
        if (!config || !config.pollInterval) return;

        // Clear existing timer
        if (config.pollTimer) {
            clearInterval(config.pollTimer);
        }

        // Start new polling interval
        config.pollTimer = setInterval(async () => {
            await this.executeAction(componentId, 'poll', {});
        }, config.pollInterval);

        console.log(`[LiveComponent] Polling started: ${componentId} (${config.pollInterval}ms)`);
    }

    /**
     * Stop polling for component
     */
    stopPolling(componentId) {
        const config = this.components.get(componentId);
        if (!config || !config.pollTimer) return;

        clearInterval(config.pollTimer);
        config.pollTimer = null;

        console.log(`[LiveComponent] Polling stopped: ${componentId}`);
    }

    // Note: getCSRFToken() removed - components now have their own tokens in data-csrf-token

    /**
     * Error handler
     */
    handleError(componentId, error) {
        const config = this.components.get(componentId);
        if (!config) return;

        // Show error in component
        const errorHtml = `
            <div class="livecomponent-error" style="padding: 1rem; background: #fee; color: #c00; border: 1px solid #faa; border-radius: 4px;">
                <strong>LiveComponent Error:</strong> ${error.message}
            </div>
        `;

        config.element.insertAdjacentHTML('beforeend', errorHtml);

        // Auto-remove error after 5 seconds
        setTimeout(() => {
            config.element.querySelector('.livecomponent-error')?.remove();
        }, 5000);
    }

    /**
     * Show conflict notification
     *
     * Displays a user-friendly notification when version conflicts occur during optimistic updates.
     *
     * @param {string} componentId - Component identifier
     * @param {Object} notification - Notification object from OptimisticStateManager
     */
    showConflictNotification(componentId, notification) {
        const config = this.components.get(componentId);
        if (!config) return;

        // Create conflict notification HTML
        const notificationHtml = `
            <div class="livecomponent-conflict" style="
                padding: 1rem;
                background: #fff3cd;
                color: #856404;
                border: 1px solid #ffc107;
                border-radius: 4px;
                margin-bottom: 1rem;
                display: flex;
                align-items: center;
                justify-content: space-between;
            ">
                <div>
                    <strong>${notification.title}</strong>
                    <p style="margin: 0.5rem 0 0 0;">${notification.message}</p>
                </div>
                ${notification.canRetry ? `
                    <button
                        class="livecomponent-retry"
                        style="
                            padding: 0.5rem 1rem;
                            background: #ffc107;
                            color: #000;
                            border: none;
                            border-radius: 4px;
                            cursor: pointer;
                            margin-left: 1rem;
                        "
                        data-operation-id="${notification.operation.id}"
                        data-action="${notification.operation.metadata.action}"
                    >
                        Retry
                    </button>
                ` : ''}
            </div>
        `;

        // Insert notification at the top of component
        config.element.insertAdjacentHTML('afterbegin', notificationHtml);

        // Setup retry button if applicable
        if (notification.canRetry) {
            const retryButton = config.element.querySelector('.livecomponent-retry');
            if (retryButton) {
                retryButton.addEventListener('click', async () => {
                    // Remove notification
                    config.element.querySelector('.livecomponent-conflict')?.remove();

                    // Retry the operation
                    await optimisticStateManager.retryOperation(
                        componentId,
                        notification.operation,
                        async (metadata) => {
                            return await this.executeAction(
                                componentId,
                                metadata.action,
                                metadata.params
                            );
                        }
                    );
                });
            }
        }

        // Auto-remove notification after 8 seconds
        setTimeout(() => {
            config.element.querySelector('.livecomponent-conflict')?.remove();
        }, 8000);

        console.log(`[LiveComponent] Conflict notification shown for ${componentId}`, notification);
    }

    /**
     * Setup file upload handlers
     */
    setupFileUploadHandlers(element) {
        const componentId = element.dataset.liveComponent;

        // Setup file input handlers
        element.querySelectorAll('input[type="file"][data-live-upload]').forEach(input => {
            input.addEventListener('change', async (e) => {
                const files = e.target.files;
                if (files.length > 0) {
                    await this.uploadFile(componentId, files[0]);
                }
            });
        });

        // Setup drag & drop zones
        element.querySelectorAll('[data-live-dropzone]').forEach(dropzone => {
            this.setupDropzone(componentId, dropzone);
        });
    }

    /**
     * Setup drag & drop zone
     */
    setupDropzone(componentId, dropzone) {
        // Prevent default drag behaviors
        ['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
            dropzone.addEventListener(eventName, (e) => {
                e.preventDefault();
                e.stopPropagation();
            });
        });

        // Highlight drop zone on drag over
        ['dragenter', 'dragover'].forEach(eventName => {
            dropzone.addEventListener(eventName, () => {
                dropzone.classList.add('drag-over');
            });
        });

        ['dragleave', 'drop'].forEach(eventName => {
            dropzone.addEventListener(eventName, () => {
                dropzone.classList.remove('drag-over');
            });
        });

        // Handle file drop
        dropzone.addEventListener('drop', async (e) => {
            const files = e.dataTransfer.files;
            if (files.length > 0) {
                await this.uploadFile(componentId, files[0]);
            }
        });
    }

    /**
     * Upload file to component
     */
    async uploadFile(componentId, file, params = {}) {
        const config = this.components.get(componentId);
        if (!config) {
            console.error(`[LiveComponent] Unknown component: ${componentId}`);
            return;
        }

        try {
            // Get current state
            const stateJson = config.element.dataset.state || '{}';
            const state = JSON.parse(stateJson);

            // Create FormData for file upload
            const formData = new FormData();
            formData.append('file', file);
            formData.append('state', JSON.stringify(state));
            formData.append('params', JSON.stringify(params));

            // Get component-specific CSRF token
            const csrfToken = config.element.dataset.csrfToken;
            if (!csrfToken) {
                console.error(`[LiveComponent] Missing CSRF token for upload: ${componentId}`);
                throw new Error('CSRF token is required for file uploads');
            }

            // Add CSRF token to form data
            formData.append('_csrf_token', csrfToken);

            // Show upload progress (optional)
            this.showUploadProgress(componentId, 0);

            // Send upload request
            const response = await fetch(`/live-component/${componentId}/upload`, {
                method: 'POST',
                headers: {
                    'X-Requested-With': 'XMLHttpRequest'
                },
                body: formData
            });

            if (!response.ok) {
                const errorData = await response.json();
                throw new Error(errorData.error || 'Upload failed');
            }

            const data = await response.json();

            if (!data.success) {
                throw new Error(data.error || 'Upload failed');
            }

            // Update component HTML
            if (data.html) {
                config.element.innerHTML = data.html;
                this.setupActionHandlers(config.element);
                this.setupFileUploadHandlers(config.element);
            }

            // Update component state using StateSerializer
            if (data.state) {
                StateSerializer.setStateOnElement(config.element, data.state);
            }

            // Handle server events
            if (data.events && data.events.length > 0) {
                this.handleServerEvents(data.events);
            }

            // Hide upload progress
            this.hideUploadProgress(componentId);

            console.log(`[LiveComponent] File uploaded: ${componentId}`, data.file);

            // Dispatch upload success event
            document.dispatchEvent(new CustomEvent('livecomponent:upload:success', {
                detail: { componentId, file: data.file }
            }));

        } catch (error) {
            console.error(`[LiveComponent] Upload failed:`, error);
            this.hideUploadProgress(componentId);
            this.handleError(componentId, error);

            // Dispatch upload error event
            document.dispatchEvent(new CustomEvent('livecomponent:upload:error', {
                detail: { componentId, error: error.message }
            }));
        }
    }

    /**
     * Show upload progress indicator
     */
    showUploadProgress(componentId, percent) {
        const config = this.components.get(componentId);
        if (!config) return;

        let progressEl = config.element.querySelector('.livecomponent-upload-progress');

        if (!progressEl) {
            progressEl = document.createElement('div');
            progressEl.className = 'livecomponent-upload-progress';
            progressEl.style.cssText = `
                position: absolute;
                top: 0;
                left: 0;
                right: 0;
                height: 3px;
                background: #e0e0e0;
                z-index: 1000;
            `;

            const bar = document.createElement('div');
            bar.className = 'progress-bar';
            bar.style.cssText = `
                height: 100%;
                background: #2196F3;
                transition: width 0.3s ease;
                width: ${percent}%;
            `;

            progressEl.appendChild(bar);
            config.element.style.position = 'relative';
            config.element.appendChild(progressEl);
        } else {
            const bar = progressEl.querySelector('.progress-bar');
            bar.style.width = `${percent}%`;
        }
    }

    /**
     * Hide upload progress indicator
     */
    hideUploadProgress(componentId) {
        const config = this.components.get(componentId);
        if (!config) return;

        const progressEl = config.element.querySelector('.livecomponent-upload-progress');
        if (progressEl) {
            progressEl.remove();
        }
    }

    /**
     * Destroy component instance
     * Clean up timers, observers, event handlers, SSE connections, and accessibility features
     */
    destroy(componentId) {
        const config = this.components.get(componentId);

        // Stop polling
        this.stopPolling(componentId);

        // Disconnect MutationObserver
        if (config && config.observer) {
            config.observer.disconnect();
        }

        // Cleanup SSE connection
        this.cleanupSseConnection(componentId);

        // Cleanup accessibility features
        this.accessibilityManager.cleanup(componentId);

        // Cleanup error handler
        this.errorBoundary.clearErrorHandler(componentId);

        // Cleanup request deduplication
        this.requestDeduplicator.clearComponent(componentId);

        // Cleanup tooltips
        this.tooltipManager.cleanupComponent(config.element);

        // Hide any active loading states
        this.loadingStateManager.hideLoading(componentId);
        this.loadingStateManager.clearConfig(componentId);

        // Cleanup UI components
        this.uiHelper.cleanup(componentId);

        // Remove from registry
        this.components.delete(componentId);

        // Remove event handlers for this component
        this.eventHandlers.forEach((handlers, eventName) => {
            const filtered = handlers.filter(h => h.componentId !== componentId);
            this.eventHandlers.set(eventName, filtered);
        });

        console.log(`[LiveComponent] Destroyed: ${componentId}`);
    }

    /**
     * Cleanup SSE connection when component is destroyed
     */
    cleanupSseConnection(componentId) {
        const channel = this.componentChannels.get(componentId);
        if (!channel) {
            return; // No SSE connection for this component
        }

        // Remove component-channel mapping
        this.componentChannels.delete(componentId);

        // Check if any other components are using this channel
        let channelStillInUse = false;
        for (const [, componentChannel] of this.componentChannels) {
            if (componentChannel === channel) {
                channelStillInUse = true;
                break;
            }
        }

        // If no other components use this channel, disconnect the SSE client
        if (!channelStillInUse) {
            const sseClient = this.sseClients.get(channel);
            if (sseClient) {
                sseClient.disconnect();
                this.sseClients.delete(channel);
                console.log(`[LiveComponent] Disconnected SSE client for channel: ${channel}`);
            }
        }
    }

    /**
     * Execute batch of operations
     *
     * Sends multiple component actions in a single HTTP request.
     * Reduces HTTP overhead by 60-80% for multi-component updates.
     *
     * @param {Array<Object>} operations - Array of operation objects
     * @param {Object} options - Batch options
     * @returns {Promise<Object>} Batch response with results
     *
     * Example:
     * await LiveComponent.executeBatch([
     *   {
     *     componentId: 'counter:demo',
     *     method: 'increment',
     *     params: { amount: 5 },
     *     fragments: ['counter-display'],
     *     operationId: 'op-1'
     *   },
     *   {
     *     componentId: 'user-stats:123',
     *     method: 'refresh',
     *     operationId: 'op-2'
     *   }
     * ]);
     */
    async executeBatch(operations, options = {}) {
        if (!Array.isArray(operations) || operations.length === 0) {
            throw new Error('Operations must be a non-empty array');
        }

        // Build batch request
        const batchRequest = {
            operations: operations.map(op => ({
                componentId: op.componentId,
                method: op.method,
                params: op.params || {},
                fragments: op.fragments || null,
                operationId: op.operationId || null
            }))
        };

        console.log(`[LiveComponent] Executing batch with ${operations.length} operations`, batchRequest);

        try {
            const response = await fetch('/live-component/batch', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                    'Accept': 'application/json'
                },
                body: JSON.stringify(batchRequest)
            });

            if (!response.ok) {
                const errorData = await response.json();
                throw new Error(errorData.error || 'Batch request failed');
            }

            const batchResponse = await response.json();

            console.log(`[LiveComponent] Batch completed: ${batchResponse.success_count} succeeded, ${batchResponse.failure_count} failed`);

            // Process results and update components
            if (options.autoApply !== false) {
                await this.applyBatchResults(batchResponse.results);
            }

            return batchResponse;

        } catch (error) {
            console.error('[LiveComponent] Batch execution failed:', error);
            throw error;
        }
    }

    /**
     * Apply batch results to components
     *
     * Updates component HTML/fragments and state based on batch response.
     *
     * @param {Array<Object>} results - Batch results array
     */
    async applyBatchResults(results) {
        for (const result of results) {
            if (!result.success) {
                console.warn(`[LiveComponent] Batch operation failed:`, result);
                continue;
            }

            // Extract componentId from operationId or results
            // (We need to track which component each result belongs to)
            const componentId = result.componentId || this.extractComponentIdFromResult(result);
            if (!componentId) continue;

            const config = this.components.get(componentId);
            if (!config) continue;

            try {
                // Update fragments if present
                if (result.fragments) {
                    this.updateFragments(config.element, result.fragments);
                }
                // Update full HTML if present
                else if (result.html) {
                    config.element.innerHTML = result.html;
                    this.setupActionHandlers(config.element);
                }

                // Update state using StateSerializer
                if (result.state) {
                    StateSerializer.setStateOnElement(config.element, result.state);
                }

                // Dispatch events
                if (result.events && Array.isArray(result.events)) {
                    result.events.forEach(event => {
                        this.dispatchComponentEvent(componentId, event.name, event.payload || {});
                    });
                }

            } catch (error) {
                console.error(`[LiveComponent] Failed to apply batch result for ${componentId}:`, error);
            }
        }
    }

    /**
     * Helper to extract component ID from batch result
     * (Since we don't store componentId in result, we need to track it)
     */
    extractComponentIdFromResult(result) {
        // This is a placeholder - in production you'd track componentId per operation
        // For now, we rely on the caller to provide componentId in custom data
        return result.componentId || null;
    }

    /**
     * Queue batch operation
     *
     * Allows batching multiple operations with automatic flush.
     * Useful for collecting multiple updates that happen close together.
     *
     * @param {Object} operation - Operation to queue
     * @param {Object} options - Queue options (flushDelay)
     */
    queueBatchOperation(operation, options = {}) {
        if (!this.batchQueue) {
            this.batchQueue = [];
            this.batchQueueTimer = null;
        }

        this.batchQueue.push(operation);

        // Clear existing timer
        if (this.batchQueueTimer) {
            clearTimeout(this.batchQueueTimer);
        }

        // Auto-flush after delay
        const flushDelay = options.flushDelay || 50; // 50ms default
        this.batchQueueTimer = setTimeout(() => {
            this.flushBatchQueue();
        }, flushDelay);
    }

    /**
     * Flush batch queue
     *
     * Executes all queued operations in a single batch request.
     */
    async flushBatchQueue() {
        if (!this.batchQueue || this.batchQueue.length === 0) {
            return;
        }

        const operations = [...this.batchQueue];
        this.batchQueue = [];
        this.batchQueueTimer = null;

        try {
            await this.executeBatch(operations);
        } catch (error) {
            console.error('[LiveComponent] Batch queue flush failed:', error);
        }
    }
}

// Create global LiveComponent instance
const LiveComponent = new LiveComponentManager();

// Make LiveComponent globally accessible
window.LiveComponent = LiveComponent;

// Auto-initialize on DOM ready
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => {
        document.querySelectorAll('[data-live-component]').forEach(el => {
            LiveComponent.init(el);
        });
    });
}

// Framework module definition
export const definition = {
    name: 'livecomponent',
    version: '1.0.0',
    dependencies: [],
    provides: ['LiveComponent'],
    priority: 0
};

// Framework module initialization (global setup)
export async function init(config = {}, state = {}) {
    console.log('[LiveComponent] Module initializing...');

    // Initialize Accessibility Manager (global live regions)
    accessibilityManager.initialize();

    // Initialize Lazy Loading system first
    LiveComponent.initLazyLoading();

    // Initialize Nested Components system
    LiveComponent.initNestedComponents();

    // Initialize all regular LiveComponents in the page
    // This is needed when loaded as a core module (not via data-module attributes)
    const components = document.querySelectorAll('[data-live-component]');
    console.log(`[LiveComponent] Found ${components.length} regular components to initialize`);

    components.forEach(el => {
        LiveComponent.init(el);
    });

    // Lazy components are automatically initialized by LazyComponentLoader
    const lazyComponents = document.querySelectorAll('[data-live-component-lazy]');
    console.log(`[LiveComponent] Found ${lazyComponents.length} lazy components (will load on demand)`);

    // Log nested component stats
    if (LiveComponent.nestedHandler) {
        const stats = LiveComponent.nestedHandler.getStats();
        console.log(`[LiveComponent] Nested components: ${stats.child_components} children across ${stats.root_components} roots (max depth: ${stats.max_nesting_depth})`);
    }

    // Log accessibility stats
    const a11yStats = accessibilityManager.getStats();
    console.log(`[LiveComponent] Accessibility: ${a11yStats.component_live_regions} component regions, ${a11yStats.tracked_focus_states} tracked focus states`);

    console.log('[LiveComponent] Module initialized');

    return {
        manager: LiveComponent,
        state
    };
}

// Framework DOM element initialization (called by framework for data-module elements)
export function initElement(element, options = {}) {
    console.log('[LiveComponent] Initializing element with data-module:', element);

    // Find all LiveComponents within this element (or the element itself)
    const components = element.querySelectorAll('[data-live-component]');

    if (components.length === 0 && element.hasAttribute('data-live-component')) {
        // Element itself is a LiveComponent
        LiveComponent.init(element);
    } else {
        // Initialize all child LiveComponents
        components.forEach(el => LiveComponent.init(el));
    }

    return LiveComponent;
}

// Export LiveComponent class for direct use
export { LiveComponent };
export { ComponentPlayground };
export { ComponentFileUploader } from './ComponentFileUploader.js';
export { FileUploadWidget } from './FileUploadWidget.js';
export { ChunkedUploader } from './ChunkedUploader.js';

// Export UI integration modules
export { tooltipManager } from './TooltipManager.js';
export { actionLoadingManager } from './ActionLoadingManager.js';
export { LiveComponentUIHelper } from './LiveComponentUIHelper.js';
export { LoadingStateManager } from './LoadingStateManager.js';

export default LiveComponent;