/**
 * UI Event Handler for LiveComponents
 * 
 * Listens to UI-related events from LiveComponents and automatically
 * displays Toasts, Modals, and other UI components.
 * 
 * Supported Events:
 * - toast:show - Show toast notification
 * - toast:hide - Hide toast notification
 * - modal:show - Show modal dialog
 * - modal:close - Close modal dialog
 * - modal:confirm - Show confirmation dialog
 * - modal:alert - Show alert dialog
 */

import { LiveComponentUIHelper } from './LiveComponentUIHelper.js';

export class UIEventHandler {
    constructor(liveComponentManager) {
        this.manager = liveComponentManager;
        this.uiHelper = liveComponentManager.uiHelper || new LiveComponentUIHelper(liveComponentManager);
        this.eventListeners = new Map();
        this.isInitialized = false;
        this.drawerManager = null; // Lazy-loaded when needed
        this.popoverManager = null; // Lazy-loaded when needed
    }

    /**
     * Initialize event listeners
     */
    init() {
        if (this.isInitialized) {
            return;
        }

        // Toast events
        this.addEventListener('toast:show', (e) => this.handleToastShow(e));
        this.addEventListener('toast:hide', (e) => this.handleToastHide(e));

        // Modal events
        this.addEventListener('modal:show', (e) => this.handleModalShow(e));
        this.addEventListener('modal:close', (e) => this.handleModalClose(e));
        this.addEventListener('modal:confirm', (e) => this.handleModalConfirm(e));
        this.addEventListener('modal:alert', (e) => this.handleModalAlert(e));

        // Also listen to livecomponent: prefixed events for compatibility
        this.addEventListener('livecomponent:toast:show', (e) => this.handleToastShow(e));
        this.addEventListener('livecomponent:toast:hide', (e) => this.handleToastHide(e));
        this.addEventListener('livecomponent:modal:show', (e) => this.handleModalShow(e));
        this.addEventListener('livecomponent:modal:close', (e) => this.handleModalClose(e));
        this.addEventListener('livecomponent:modal:confirm', (e) => this.handleModalConfirm(e));
        this.addEventListener('livecomponent:modal:alert', (e) => this.handleModalAlert(e));

        // Drawer events
        this.addEventListener('drawer:open', (e) => this.handleDrawerOpen(e));
        this.addEventListener('drawer:close', (e) => this.handleDrawerClose(e));
        this.addEventListener('drawer:toggle', (e) => this.handleDrawerToggle(e));
        this.addEventListener('livecomponent:drawer:open', (e) => this.handleDrawerOpen(e));
        this.addEventListener('livecomponent:drawer:close', (e) => this.handleDrawerClose(e));
        this.addEventListener('livecomponent:drawer:toggle', (e) => this.handleDrawerToggle(e));

        // Popover events
        this.addEventListener('popover:show', (e) => this.handlePopoverShow(e));
        this.addEventListener('popover:hide', (e) => this.handlePopoverHide(e));
        this.addEventListener('popover:toggle', (e) => this.handlePopoverToggle(e));
        this.addEventListener('livecomponent:popover:show', (e) => this.handlePopoverShow(e));
        this.addEventListener('livecomponent:popover:hide', (e) => this.handlePopoverHide(e));
        this.addEventListener('livecomponent:popover:toggle', (e) => this.handlePopoverToggle(e));

        this.isInitialized = true;
        console.log('[UIEventHandler] Initialized');
    }

    /**
     * Add event listener
     * @param {string} eventName - Event name
     * @param {Function} handler - Event handler
     */
    addEventListener(eventName, handler) {
        const wrappedHandler = (e) => {
            try {
                handler(e);
            } catch (error) {
                console.error(`[UIEventHandler] Error handling event ${eventName}:`, error);
            }
        };

        document.addEventListener(eventName, wrappedHandler);
        this.eventListeners.set(eventName, wrappedHandler);
    }

    /**
     * Remove event listener
     * @param {string} eventName - Event name
     */
    removeEventListener(eventName) {
        const handler = this.eventListeners.get(eventName);
        if (handler) {
            document.removeEventListener(eventName, handler);
            this.eventListeners.delete(eventName);
        }
    }

    /**
     * Handle toast:show event
     * @param {CustomEvent} e - Event object
     */
    handleToastShow(e) {
        const payload = e.detail || {};
        const {
            message = '',
            type = 'info',
            duration = 5000,
            position = 'top-right',
            componentId = 'global'
        } = payload;

        if (!message) {
            console.warn('[UIEventHandler] toast:show event missing message');
            return;
        }

        console.log(`[UIEventHandler] Showing toast: ${message} (${type})`);

        this.uiHelper.showNotification(componentId, {
            message: message,
            type: type,
            duration: duration,
            position: position
        });
    }

    /**
     * Handle toast:hide event
     * @param {CustomEvent} e - Event object
     */
    handleToastHide(e) {
        const payload = e.detail || {};
        const { componentId = 'global' } = payload;

        console.log(`[UIEventHandler] Hiding toast for component: ${componentId}`);

        this.uiHelper.hideNotification(componentId);
    }

    /**
     * Handle modal:show event
     * @param {CustomEvent} e - Event object
     */
    handleModalShow(e) {
        const payload = e.detail || {};
        const {
            componentId,
            title = '',
            content = '',
            size = 'medium',
            buttons = [],
            closeOnBackdrop = true,
            closeOnEscape = true,
            onClose = null,
            onConfirm = null
        } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] modal:show event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Showing modal for component: ${componentId}`);

        this.uiHelper.showDialog(componentId, {
            title: title,
            content: content,
            size: size,
            buttons: buttons,
            closeOnBackdrop: closeOnBackdrop,
            closeOnEscape: closeOnEscape,
            onClose: onClose,
            onConfirm: onConfirm
        });
    }

    /**
     * Handle modal:close event
     * @param {CustomEvent} e - Event object
     */
    handleModalClose(e) {
        const payload = e.detail || {};
        const { componentId } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] modal:close event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Closing modal for component: ${componentId}`);

        this.uiHelper.closeDialog(componentId);
    }

    /**
     * Handle modal:confirm event
     * @param {CustomEvent} e - Event object
     */
    async handleModalConfirm(e) {
        const payload = e.detail || {};
        const {
            componentId,
            title = 'Confirm',
            message = 'Are you sure?',
            confirmText = 'Confirm',
            cancelText = 'Cancel',
            confirmClass = 'btn-primary',
            cancelClass = 'btn-secondary',
            confirmAction = null,
            confirmParams = null,
            onConfirm = null,
            onCancel = null
        } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] modal:confirm event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Showing confirmation dialog for component: ${componentId}`);

        try {
            const confirmed = await this.uiHelper.showConfirm(componentId, {
                title: title,
                message: message,
                confirmText: confirmText,
                cancelText: cancelText,
                confirmClass: confirmClass,
                cancelClass: cancelClass
            });

            // If user confirmed and confirmAction is provided, call the LiveComponent action
            if (confirmed && confirmAction) {
                console.log(`[UIEventHandler] User confirmed, calling action: ${confirmAction}`, confirmParams);
                
                // Call LiveComponent action via manager
                if (this.manager && typeof this.manager.callAction === 'function') {
                    await this.manager.callAction(componentId, confirmAction, confirmParams || {});
                } else if (this.manager && typeof this.manager.executeAction === 'function') {
                    // Fallback to executeAction for backward compatibility
                    await this.manager.executeAction(componentId, confirmAction, confirmParams || {});
                } else {
                    console.warn('[UIEventHandler] Cannot execute confirmAction: manager.callAction/executeAction not available');
                }
            }

            // Legacy callback support
            if (confirmed && onConfirm) {
                onConfirm();
            } else if (!confirmed && onCancel) {
                onCancel();
            }

            // Dispatch result event
            document.dispatchEvent(new CustomEvent('modal:confirm:result', {
                detail: {
                    componentId: componentId,
                    confirmed: confirmed
                }
            }));
        } catch (error) {
            console.error('[UIEventHandler] Error showing confirmation dialog:', error);
        }
    }

    /**
     * Handle modal:alert event
     * @param {CustomEvent} e - Event object
     */
    handleModalAlert(e) {
        const payload = e.detail || {};
        const {
            componentId,
            title = 'Alert',
            message = '',
            buttonText = 'OK',
            type = 'info',
            onClose = null
        } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] modal:alert event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Showing alert dialog for component: ${componentId}`);

        this.uiHelper.showAlert(componentId, {
            title: title,
            message: message,
            buttonText: buttonText,
            type: type
        });

        if (onClose) {
            // Note: showAlert doesn't return a promise, so we'll call onClose after a delay
            // This is a limitation - ideally showAlert would return a promise
            setTimeout(() => {
                onClose();
            }, 100);
        }
    }

    /**
     * Handle drawer:open event
     * @param {CustomEvent} e - Event object
     */
    async handleDrawerOpen(e) {
        const payload = e.detail || {};
        const {
            componentId,
            title = '',
            content = '',
            position = 'left',
            width = '400px',
            showOverlay = true,
            closeOnOverlay = true,
            closeOnEscape = true,
            animation = 'slide'
        } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] drawer:open event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Opening drawer for component: ${componentId}`);

        // Initialize DrawerManager if not already done
        if (!this.drawerManager) {
            const { DrawerManager } = await import('./DrawerManager.js');
            this.drawerManager = new DrawerManager();
        }

        this.drawerManager.open(componentId, {
            title: title,
            content: content,
            position: position,
            width: width,
            showOverlay: showOverlay,
            closeOnOverlay: closeOnOverlay,
            closeOnEscape: closeOnEscape,
            animation: animation
        });
    }

    /**
     * Handle drawer:close event
     * @param {CustomEvent} e - Event object
     */
    handleDrawerClose(e) {
        const payload = e.detail || {};
        const { componentId } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] drawer:close event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Closing drawer for component: ${componentId}`);

        if (this.drawerManager) {
            this.drawerManager.close(componentId);
        }
    }

    /**
     * Handle drawer:toggle event
     * @param {CustomEvent} e - Event object
     */
    handleDrawerToggle(e) {
        const payload = e.detail || {};
        const { componentId } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] drawer:toggle event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Toggling drawer for component: ${componentId}`);

        if (this.drawerManager) {
            const isOpen = this.drawerManager.isOpen(componentId);
            if (isOpen) {
                this.drawerManager.close(componentId);
            } else {
                // For toggle, we need the full options - this is a limitation
                // In practice, components should use open/close explicitly
                console.warn('[UIEventHandler] drawer:toggle requires full options - use drawer:open/close instead');
            }
        }
    }

    /**
     * Handle popover:show event
     * @param {CustomEvent} e - Event object
     */
    async handlePopoverShow(e) {
        const payload = e.detail || {};
        const {
            componentId,
            anchorId,
            content = '',
            title = '',
            position = 'top',
            showArrow = true,
            offset = 8,
            closeOnOutsideClick = true
        } = payload;

        if (!componentId || !anchorId) {
            console.warn('[UIEventHandler] popover:show event missing componentId or anchorId');
            return;
        }

        console.log(`[UIEventHandler] Showing popover for component: ${componentId}`);

        // Initialize PopoverManager if not already done
        if (!this.popoverManager) {
            const { PopoverManager } = await import('./PopoverManager.js');
            this.popoverManager = new PopoverManager();
        }

        this.popoverManager.show(componentId, {
            anchorId: anchorId,
            content: content,
            title: title,
            position: position,
            showArrow: showArrow,
            offset: offset,
            closeOnOutsideClick: closeOnOutsideClick
        });
    }

    /**
     * Handle popover:hide event
     * @param {CustomEvent} e - Event object
     */
    handlePopoverHide(e) {
        const payload = e.detail || {};
        const { componentId } = payload;

        if (!componentId) {
            console.warn('[UIEventHandler] popover:hide event missing componentId');
            return;
        }

        console.log(`[UIEventHandler] Hiding popover for component: ${componentId}`);

        if (this.popoverManager) {
            this.popoverManager.hide(componentId);
        }
    }

    /**
     * Handle popover:toggle event
     * @param {CustomEvent} e - Event object
     */
    async handlePopoverToggle(e) {
        const payload = e.detail || {};
        const {
            componentId,
            anchorId,
            content = '',
            title = '',
            position = 'top',
            showArrow = true,
            offset = 8,
            closeOnOutsideClick = true
        } = payload;

        if (!componentId || !anchorId) {
            console.warn('[UIEventHandler] popover:toggle event missing componentId or anchorId');
            return;
        }

        // Initialize PopoverManager if not already done
        if (!this.popoverManager) {
            const { PopoverManager } = await import('./PopoverManager.js');
            this.popoverManager = new PopoverManager();
        }

        // Check if popover is visible
        const isVisible = this.popoverManager.popovers.has(componentId);
        
        if (isVisible) {
            this.popoverManager.hide(componentId);
        } else {
            this.popoverManager.show(componentId, {
                anchorId: anchorId,
                content: content,
                title: title,
                position: position,
                showArrow: showArrow,
                offset: offset,
                closeOnOutsideClick: closeOnOutsideClick
            });
        }
    }

    /**
     * Cleanup all event listeners
     */
    destroy() {
        for (const [eventName, handler] of this.eventListeners.entries()) {
            document.removeEventListener(eventName, handler);
        }
        this.eventListeners.clear();
        
        // Cleanup managers
        if (this.drawerManager) {
            this.drawerManager.destroy();
        }
        
        if (this.popoverManager) {
            this.popoverManager.destroy();
        }
        
        this.isInitialized = false;
        console.log('[UIEventHandler] Destroyed');
    }
}