/**
 * Descomplicar® Crescimento Digital
 * https://descomplicar.pt
 */

/**
 * Care Booking Block - Frontend JavaScript
 * 
 * Provides graceful degradation and enhanced interaction for KiviCare integration
 * 
 * @package CareBookingBlock
 */

(function($, config) {
    'use strict';

    // Global configuration
    const CareBooking = {
        config: config || {},
        initialized: false,
        retryCount: 0,
        observers: [],

        /**
         * Initialize the Care Booking frontend functionality
         */
        init: function() {
            if (this.initialized) {
                return;
            }

            if (this.config.debug) {
                console.log('Care Booking Block: Initializing frontend scripts');
            }

            this.setupObservers();
            this.enhanceExistingElements();
            this.setupEventListeners();
            this.setupFallbacks();

            this.initialized = true;
        },

        /**
         * Setup MutationObserver to watch for dynamically added content
         */
        setupObservers: function() {
            if (!window.MutationObserver) {
                if (this.config.debug) {
                    console.warn('Care Booking Block: MutationObserver not supported');
                }
                return;
            }

            const observer = new MutationObserver((mutations) => {
                let hasNewContent = false;

                mutations.forEach((mutation) => {
                    if (mutation.type === 'childList' && mutation.addedNodes.length > 0) {
                        mutation.addedNodes.forEach((node) => {
                            if (node.nodeType === Node.ELEMENT_NODE) {
                                // Check if new node contains KiviCare content
                                if (this.hasKiviCareContent(node)) {
                                    hasNewContent = true;
                                }
                            }
                        });
                    }
                });

                if (hasNewContent) {
                    this.enhanceNewContent();
                }
            });

            // Start observing
            observer.observe(document.body, {
                childList: true,
                subtree: true
            });

            this.observers.push(observer);
        },

        /**
         * Check if element contains KiviCare content
         * @param {Element} element
         * @returns {boolean}
         */
        hasKiviCareContent: function(element) {
            const selectors = [
                this.config.selectors.doctors,
                this.config.selectors.services,
                this.config.selectors.forms
            ].join(', ');

            return $(element).find(selectors).length > 0 || $(element).is(selectors);
        },

        /**
         * Enhance existing KiviCare elements on page load
         */
        enhanceExistingElements: function() {
            this.enhanceLoadingStates();
            this.enhanceFormValidation();
            this.enhanceFallbackElements();
        },

        /**
         * Enhance newly added content
         */
        enhanceNewContent: function() {
            if (this.config.debug) {
                console.log('Care Booking Block: Enhancing new content');
            }

            // Add a small delay to ensure DOM is stable
            setTimeout(() => {
                this.enhanceExistingElements();
            }, 100);
        },

        /**
         * Setup loading states for better UX
         */
        enhanceLoadingStates: function() {
            const $forms = $(this.config.selectors.forms);
            
            $forms.each((index, form) => {
                const $form = $(form);
                
                // Add loading indicator
                if (!$form.find('.care-booking-loading').length) {
                    $form.prepend('<div class="care-booking-loading" style="display: none;">Loading...</div>');
                }

                // Handle form submissions
                $form.on('submit', (e) => {
                    this.showLoadingState($form);
                });

                // Handle AJAX requests
                $(document).on('ajaxStart', () => {
                    if (this.isKiviCareAjax()) {
                        this.showLoadingState($form);
                    }
                });

                $(document).on('ajaxComplete', () => {
                    this.hideLoadingState($form);
                });
            });
        },

        /**
         * Show loading state
         * @param {jQuery} $element
         */
        showLoadingState: function($element) {
            $element.addClass('care-booking-loading');
            $element.find('.care-booking-loading').show();
        },

        /**
         * Hide loading state
         * @param {jQuery} $element
         */
        hideLoadingState: function($element) {
            $element.removeClass('care-booking-loading');
            $element.find('.care-booking-loading').hide();
        },

        /**
         * Check if current AJAX request is KiviCare related
         * @returns {boolean}
         */
        isKiviCareAjax: function() {
            // This is a simplified check - could be enhanced based on KiviCare's AJAX patterns
            return window.location.href.indexOf('kivicare') !== -1 ||
                   document.body.className.indexOf('kivicare') !== -1;
        },

        /**
         * Enhance form validation
         */
        enhanceFormValidation: function() {
            const $forms = $(this.config.selectors.forms);

            $forms.each((index, form) => {
                const $form = $(form);

                $form.on('submit', (e) => {
                    if (!this.validateBookingForm($form)) {
                        e.preventDefault();
                        return false;
                    }
                });

                // Real-time validation for select fields
                $form.find('select').on('change', (e) => {
                    this.validateSelectField($(e.target));
                });
            });
        },

        /**
         * Validate booking form
         * @param {jQuery} $form
         * @returns {boolean}
         */
        validateBookingForm: function($form) {
            let isValid = true;
            const requiredFields = $form.find('select[required], input[required]');

            requiredFields.each((index, field) => {
                const $field = $(field);
                if (!$field.val() || $field.val() === '0' || $field.val() === '') {
                    isValid = false;
                    this.showFieldError($field, 'This field is required');
                } else {
                    this.clearFieldError($field);
                }
            });

            return isValid;
        },

        /**
         * Validate individual select field
         * @param {jQuery} $field
         */
        validateSelectField: function($field) {
            const value = $field.val();
            
            if ($field.attr('required') && (!value || value === '0' || value === '')) {
                this.showFieldError($field, 'Please make a selection');
            } else {
                this.clearFieldError($field);
            }
        },

        /**
         * Show field error
         * @param {jQuery} $field
         * @param {string} message
         */
        showFieldError: function($field, message) {
            $field.addClass('error');
            
            let $error = $field.siblings('.field-error');
            if (!$error.length) {
                $error = $('<div class="field-error"></div>');
                $field.after($error);
            }
            
            $error.text(message).show();
        },

        /**
         * Clear field error
         * @param {jQuery} $field
         */
        clearFieldError: function($field) {
            $field.removeClass('error');
            $field.siblings('.field-error').hide();
        },

        /**
         * Setup fallback elements for graceful degradation
         */
        enhanceFallbackElements: function() {
            // Add fallback classes to elements that might be blocked
            $(this.config.selectors.doctors).each((index, element) => {
                const $element = $(element);
                if (!$element.hasClass('care-booking-fallback')) {
                    $element.addClass('care-booking-enhanced');
                }
            });

            $(this.config.selectors.services).each((index, element) => {
                const $element = $(element);
                if (!$element.hasClass('care-booking-fallback')) {
                    $element.addClass('care-booking-enhanced');
                }
            });
        },

        /**
         * Setup event listeners
         */
        setupEventListeners: function() {
            // Handle dynamic doctor selection
            $(document).on('change', 'select[name="doctor_id"], .doctor-selection', (e) => {
                this.handleDoctorChange($(e.target));
            });

            // Handle service selection
            $(document).on('change', 'select[name="service_id"], .service-selection', (e) => {
                this.handleServiceChange($(e.target));
            });

            // Handle retry buttons
            $(document).on('click', '.care-booking-retry', (e) => {
                e.preventDefault();
                this.retryOperation($(e.target));
            });
        },

        /**
         * Handle doctor selection change
         * @param {jQuery} $select
         */
        handleDoctorChange: function($select) {
            const doctorId = $select.val();
            
            if (this.config.debug) {
                console.log('Care Booking Block: Doctor changed to', doctorId);
            }

            // Clear service selection if doctor changed
            const $serviceSelect = $select.closest('form').find('select[name="service_id"], .service-selection');
            if ($serviceSelect.length) {
                $serviceSelect.val('').trigger('change');
                this.updateServiceOptions($serviceSelect, doctorId);
            }
        },

        /**
         * Handle service selection change
         * @param {jQuery} $select
         */
        handleServiceChange: function($select) {
            const serviceId = $select.val();
            
            if (this.config.debug) {
                console.log('Care Booking Block: Service changed to', serviceId);
            }

            // Additional service-specific logic can be added here
        },

        /**
         * Update service options based on selected doctor
         * @param {jQuery} $serviceSelect
         * @param {string} doctorId
         */
        updateServiceOptions: function($serviceSelect, doctorId) {
            if (!doctorId || doctorId === '0') {
                return;
            }

            // This would typically make an AJAX request to get services
            // For now, we'll rely on KiviCare's existing functionality
            $serviceSelect.trigger('doctor_changed', [doctorId]);
        },

        /**
         * Setup fallback mechanisms
         */
        setupFallbacks: function() {
            if (!this.config.fallbackEnabled) {
                return;
            }

            // Setup automatic retry for failed operations
            this.setupAutoRetry();
            
            // Setup offline detection
            this.setupOfflineDetection();
        },

        /**
         * Setup automatic retry for failed operations
         */
        setupAutoRetry: function() {
            $(document).on('ajaxError', (event, jqXHR, ajaxSettings, thrownError) => {
                if (this.isKiviCareAjax() && this.retryCount < this.config.retryAttempts) {
                    setTimeout(() => {
                        this.retryCount++;
                        if (this.config.debug) {
                            console.log('Care Booking Block: Retrying operation, attempt', this.retryCount);
                        }
                        
                        // Retry the failed request
                        $.ajax(ajaxSettings);
                    }, this.config.retryDelay);
                }
            });
        },

        /**
         * Setup offline detection
         */
        setupOfflineDetection: function() {
            $(window).on('online offline', (e) => {
                const isOnline = e.type === 'online';
                
                if (this.config.debug) {
                    console.log('Care Booking Block: Connection status changed to', isOnline ? 'online' : 'offline');
                }

                if (isOnline) {
                    // Retry any pending operations
                    this.retryPendingOperations();
                } else {
                    // Show offline message
                    this.showOfflineMessage();
                }
            });
        },

        /**
         * Retry pending operations when back online
         */
        retryPendingOperations: function() {
            // Implementation would depend on what operations need to be retried
            if (this.config.debug) {
                console.log('Care Booking Block: Retrying pending operations');
            }
        },

        /**
         * Show offline message
         */
        showOfflineMessage: function() {
            const message = '<div class="care-booking-offline-message">You appear to be offline. Some features may not work properly.</div>';
            
            if (!$('.care-booking-offline-message').length) {
                $('body').prepend(message);
                
                setTimeout(() => {
                    $('.care-booking-offline-message').fadeOut();
                }, 5000);
            }
        },

        /**
         * Retry a specific operation
         * @param {jQuery} $button
         */
        retryOperation: function($button) {
            const $container = $button.closest('.care-booking-container');
            this.showLoadingState($container);
            
            // Simulate retry - in practice, this would repeat the failed operation
            setTimeout(() => {
                this.hideLoadingState($container);
                $button.closest('.error-message').fadeOut();
            }, 1000);
        },

        /**
         * Cleanup resources
         */
        destroy: function() {
            // Remove observers
            this.observers.forEach(observer => observer.disconnect());
            this.observers = [];

            // Remove event listeners
            $(document).off('.careBooking');

            this.initialized = false;
        }
    };

    // Initialize when DOM is ready
    $(document).ready(() => {
        CareBooking.init();
    });

    // Handle page unload
    $(window).on('beforeunload', () => {
        CareBooking.destroy();
    });

    // Expose to global scope for debugging
    if (config && config.debug) {
        window.CareBooking = CareBooking;
    }

})(jQuery, window.careBookingConfig);