# All files / assets/js gfmr-ssr-client.js

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     /**
     * WP GFM Renderer - SSR Client
     *
     * Handles client-side complement for Server-Side Rendering
     * - Sends rendered Mermaid SVG to server for caching
     * - Detects and processes SSR-pending elements
     *
     * @package WpGfmRenderer
     * @since 2.0.0
     */

    /* global wpGfmConfig */

    (function() {
        'use strict';

        // Wait for wpGfmConfig configuration to be available
        if (typeof wpGfmConfig === 'undefined') {
            console.warn('[GFMR SSR] wpGfmConfig configuration not found');
            return;
        }

        /**
         * Save Mermaid SVG to server cache
         *
         * @param {string} diagramId - Diagram identifier (content hash)
         * @param {string} theme - Theme identifier
         * @param {string} bgColor - Background color
         * @param {string} svg - SVG content
         */
        function saveMermaidSvgToCache(diagramId, theme, bgColor, svg) {
            // Only send if user is logged in (admin preview scenario)
            // Check if SSR nonce is available (indicates user can cache)
            if (!wpGfmConfig.mermaidSsrNonce) {
                console.log('[GFMR SSR] Skip SVG caching - no nonce available (user likely not logged in)');
                return;
            }

            const data = new URLSearchParams({
                action: 'gfmr_save_mermaid_svg',
                nonce: wpGfmConfig.mermaidSsrNonce,
                diagram_id: diagramId,
                theme: theme,
                bg_color: bgColor,
                svg: svg
            });

            // Use WordPress AJAX URL if available, fallback to standard path
            const ajaxUrl = wpGfmConfig.ajaxUrl || '/wp-admin/admin-ajax.php';
            fetch(ajaxUrl, {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/x-www-form-urlencoded',
                },
                body: data
            })
            .then(response => response.json())
            .then(result => {
                if (result.success) {
                    console.log('[GFMR SSR] Mermaid SVG cached:', diagramId);
                } else {
                    console.warn('[GFMR SSR] Failed to cache Mermaid SVG:', result.data?.message);
                }
            })
            .catch(error => {
                console.error('[GFMR SSR] Error caching Mermaid SVG:', error);
            });
        }

        /**
         * Process SSR-pending Mermaid diagrams
         *
         * Waits for Mermaid to render, then sends SVG to server
         */
        function processSsrPendingDiagrams() {
            const pendingDiagrams = document.querySelectorAll('.gfmr-mermaid-container[data-ssr="pending"]');

            if (pendingDiagrams.length === 0) {
                return;
            }

            console.log('[GFMR SSR] Found', pendingDiagrams.length, 'SSR-pending diagrams');

            // Set up MutationObserver to detect when Mermaid rendering completes
            pendingDiagrams.forEach(container => {
                const diagramId = container.getAttribute('data-diagram-id');
                const theme = container.getAttribute('data-theme') || 'default';
                const bgColor = container.getAttribute('data-mermaid-bg-color') || 'transparent';

                // Create observer to watch for SVG insertion
                const observer = new MutationObserver((mutations) => {
                    mutations.forEach((mutation) => {
                        mutation.addedNodes.forEach((node) => {
                            if (node.nodeName === 'SVG') {
                                // SVG was rendered
                                const svg = node.outerHTML;

                                // Send to server for caching
                                saveMermaidSvgToCache(diagramId, theme, bgColor, svg);

                                // Mark as processed
                                container.setAttribute('data-ssr', 'cached');

                                // Disconnect observer
                                observer.disconnect();
                            }
                        });
                    });
                });

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

                // Set timeout to disconnect observer after 30 seconds
                setTimeout(() => {
                    observer.disconnect();
                    if (container.getAttribute('data-ssr') === 'pending') {
                        console.warn('[GFMR SSR] Timeout waiting for Mermaid render:', diagramId);
                        container.setAttribute('data-ssr', 'failed');
                    }
                }, 30000);
            });
        }

        /**
         * Initialize SSR client
         */
        function init() {
            // Wait for DOM to be ready
            if (document.readyState === 'loading') {
                document.addEventListener('DOMContentLoaded', init);
                return;
            }

            console.log('[GFMR SSR] Initializing SSR client');

            // Process SSR-pending diagrams
            processSsrPendingDiagrams();

            // Re-process if new content is dynamically added
            const contentObserver = new MutationObserver((mutations) => {
                let hasNewDiagrams = false;
                mutations.forEach((mutation) => {
                    mutation.addedNodes.forEach((node) => {
                        if (node.nodeType === 1) { // Element node
                            if (node.matches && node.matches('.gfmr-mermaid-container[data-ssr="pending"]')) {
                                hasNewDiagrams = true;
                            } else if (node.querySelector) {
                                const pending = node.querySelector('.gfmr-mermaid-container[data-ssr="pending"]');
                                if (pending) {
                                    hasNewDiagrams = true;
                                }
                            }
                        }
                    });
                });

                if (hasNewDiagrams) {
                    console.log('[GFMR SSR] Detected new SSR-pending diagrams');
                    processSsrPendingDiagrams();
                }
            });

            // Observe document body for dynamic content
            contentObserver.observe(document.body, {
                childList: true,
                subtree: true
            });
        }

        // Start initialization
        init();
    })();