# All files / assets/js gfmr-charts.js

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     /**
     * GFMR Charts Module
     * Chart.js integration for WordPress (UMD version)
     *
     * @package WpGfmRenderer
     * @since 2.1.0
     */
    (function(global) {
        'use strict';

        class WPGFMCharts {
            constructor() {
                this.chartjsLoaded = false;
                this.chartjsLoadPromise = null;
                this.processedCharts = new WeakSet();

                // All supported chart types (all free)
                this.supportedTypes = new Set([
                    'line', 'bar', 'pie', 'doughnut',
                    'scatter', 'bubble', 'radar', 'polarArea'
                ]);

                // Chart configuration defaults
                this.defaultConfig = {
                    responsive: true,
                    maintainAspectRatio: true,
                    animation: { duration: 750 }
                };
            }

            /**
             * Get current theme mode
             * Charts always use light mode for consistency
             */
            isDarkTheme() {
                // Charts always use light mode
                return false;
            }

            /**
             * Get theme colors for charts
             * Charts always use light theme colors for consistency
             */
            getThemeColors() {
                // Charts always use light theme colors
                return {
                    text: '#24292f',
                    grid: '#d0d7de',
                    border: '#d0d7de'
                };
            }

            /**
             * Merge theme colors into chart config options
             * Preserves user-specified colors, applies theme colors only where unspecified
             * @param {Object} config - Chart.js configuration object
             * @returns {Object} Object containing isDark and colors for container styling
             */
            mergeThemeColors(config) {
                const colors = this.getThemeColors();

                // Deep merge helper - preserves user-specified values
                const deepMerge = (target, source) => {
                    const result = { ...target };
                    for (const key in source) {
                        if (source[key] && typeof source[key] === 'object' && !Array.isArray(source[key])) {
                            result[key] = deepMerge(target[key] || {}, source[key]);
                        } else if (target[key] === undefined) {
                            // Only apply source value if target doesn't have it
                            result[key] = source[key];
                        }
                    }
                    return result;
                };

                // Theme options (applied only if not user-specified)
                const themeOptions = {
                    color: colors.text,
                    borderColor: colors.border,
                    scales: {
                        x: {
                            grid: { color: colors.grid },
                            ticks: { color: colors.text }
                        },
                        y: {
                            grid: { color: colors.grid },
                            ticks: { color: colors.text }
                        }
                    },
                    plugins: {
                        legend: { labels: { color: colors.text } },
                        title: { color: colors.text },
                        tooltip: {
                            backgroundColor: 'rgba(255, 255, 255, 0.95)',
                            titleColor: colors.text,
                            bodyColor: colors.text,
                            borderColor: colors.border,
                            borderWidth: 1
                        }
                    }
                };

                // Merge: user options override theme options
                config.options = deepMerge(themeOptions, config.options || {});

                // Charts always use light mode
                return { isDark: false, colors };
            }

            /**
             * Apply theme colors to Chart.js global defaults
             * Charts always use light theme colors
             */
            applyThemeToDefaults() {
                Iif (!global.Chart) return;

                const colors = this.getThemeColors();

                // Global text color
                global.Chart.defaults.color = colors.text;

                // Global border color
                global.Chart.defaults.borderColor = colors.border;

                // Scale defaults (affects all axes)
                Eif (global.Chart.defaults.scale) {
                    global.Chart.defaults.scale.grid = global.Chart.defaults.scale.grid || {};
                    global.Chart.defaults.scale.grid.color = colors.grid;
                    global.Chart.defaults.scale.ticks = global.Chart.defaults.scale.ticks || {};
                    global.Chart.defaults.scale.ticks.color = colors.text;
                }

                // Plugins
                Eif (global.Chart.defaults.plugins) {
                    Eif (global.Chart.defaults.plugins.legend?.labels) {
                        global.Chart.defaults.plugins.legend.labels.color = colors.text;
                    }
                    Eif (global.Chart.defaults.plugins.title) {
                        global.Chart.defaults.plugins.title.color = colors.text;
                    }
                    Eif (global.Chart.defaults.plugins.tooltip) {
                        global.Chart.defaults.plugins.tooltip.backgroundColor = 'rgba(255, 255, 255, 0.95)';
                        global.Chart.defaults.plugins.tooltip.titleColor = colors.text;
                        global.Chart.defaults.plugins.tooltip.bodyColor = colors.text;
                        global.Chart.defaults.plugins.tooltip.borderColor = colors.border;
                        global.Chart.defaults.plugins.tooltip.borderWidth = 1;
                    }
                }
            }

            /**
             * Load Chart.js library (UMD version)
             */
            async ensureChartJSLoaded() {
                if (this.chartjsLoaded && global.Chart) {
                    return global.Chart;
                }

                Iif (this.chartjsLoadPromise) {
                    return this.chartjsLoadPromise;
                }

                this.chartjsLoadPromise = new Promise((resolve, reject) => {
                    Eif (global.Chart) {
                        this.chartjsLoaded = true;
                        resolve(global.Chart);
                        return;
                    }

                    const script = document.createElement('script');
                    // UMD version
                    script.src = global.wpGfmBuildAssetUrl('assets/libs/chartjs/chart.umd.min.js');

                    script.onload = () => {
                        this.chartjsLoaded = true;
                        console.log('[GFMR Charts] Chart.js UMD loaded');
                        // Apply theme defaults after Chart.js is loaded
                        this.applyThemeToDefaults();
                        resolve(global.Chart);
                    };

                    script.onerror = (error) => {
                        console.error('[GFMR Charts] Failed to load Chart.js:', error);
                        reject(error);
                    };

                    document.head.appendChild(script);
                });

                return this.chartjsLoadPromise;
            }

            /**
             * Check if chart type is supported
             */
            isChartAllowed(element, config) {
                // All chart types are allowed (no Pro/Free distinction)
                const chartType = config.type;

                if (!this.supportedTypes.has(chartType)) {
                    return {
                        allowed: false,
                        reason: 'unsupported_type',
                        message: `Unsupported chart type: ${chartType}`
                    };
                }

                return { allowed: true };
            }

            /**
             * Parse chart configuration from JSON
             */
            parseChartConfig(content) {
                try {
                    const config = JSON.parse(content);

                    if (!config.type) {
                        throw new Error('Chart type is required');
                    }
                    if (!config.data) {
                        throw new Error('Chart data is required');
                    }

                    config.options = {
                        ...this.defaultConfig,
                        ...(config.options || {})
                    };

                    return config;
                } catch (error) {
                    throw new Error(`Invalid chart config: ${error.message}`);
                }
            }

            /**
             * Render a single chart
             */
            async renderChart(element, config) {
                if (this.processedCharts.has(element)) {
                    return;
                }

                try {
                    // Fence-priority check
                    const checkResult = this.isChartAllowed(element, config);
                    Eif (global.wpGfmConfig?.debug) {
                        console.log('[GFMR Charts] Permission check:', config.type, checkResult.allowed ? 'allowed' : checkResult.reason);
                    }

                    if (!checkResult.allowed) {
                        this.renderBlockedMessage(element, checkResult);
                        return;
                    }

                    const Chart = await this.ensureChartJSLoaded();

                    // Merge theme colors into config (preserves user-specified colors)
                    // Charts always use light mode
                    this.mergeThemeColors(config);

                    // Create container (light theme fixed)
                    const container = document.createElement('div');
                    container.className = 'gfmr-chart-container';

                    const canvas = document.createElement('canvas');
                    canvas.id = 'gfmr-chart-' + Date.now() + '-' +
                        Math.random().toString(36).substr(2, 9);
                    container.appendChild(canvas);

                    // Replace original element
                    const targetElement = element.closest('pre') || element.parentElement;
                    if (targetElement?.parentNode) {
                        targetElement.parentNode.replaceChild(container, targetElement);
                    }

                    new Chart(canvas.getContext('2d'), config);

                    Eif (global.wpGfmConfig?.debug) {
                        console.log('[GFMR Charts] Chart rendered:', config.type);
                    }

                    this.processedCharts.add(container);
                    container.setAttribute('data-gfmr-processed', 'true');

                } catch (error) {
                    console.error('[GFMR Charts] Render error:', error);
                    this.renderErrorMessage(element, error.message);
                }
            }

            /**
             * Render blocked message (unsupported chart type)
             */
            renderBlockedMessage(element, checkResult) {
                Eif (global.wpGfmConfig?.debug) {
                    console.log('[GFMR Charts] Rendering blocked message:', checkResult.reason);
                }

                const container = document.createElement('div');
                container.className = 'gfmr-chart-blocked';

                const message = checkResult.message || 'Chart not available';

                container.innerHTML = `
                    <div class="gfmr-chart-error-content">
                        <div class="gfmr-chart-error-icon">📊</div>
                        <strong>${this.escapeHtml(message)}</strong>
                    </div>
                `;

                const targetElement = element.closest('pre') || element.parentElement;
                if (targetElement?.parentNode) {
                    targetElement.parentNode.replaceChild(container, targetElement);
                }

                this.processedCharts.add(container);
            }

            /**
             * Render error message
             */
            renderErrorMessage(element, message) {
                const container = document.createElement('div');
                container.className = 'gfmr-chart-error';
                container.innerHTML = `
                    <div class="gfmr-chart-error-content">
                        <strong>Chart Error:</strong> ${this.escapeHtml(message)}
                    </div>
                `;

                const targetElement = element.closest('pre') || element.parentElement;
                if (targetElement?.parentNode) {
                    targetElement.parentNode.replaceChild(container, targetElement);
                }
            }

            /**
             * HTML escape utility
             */
            escapeHtml(text) {
                const div = document.createElement('div');
                div.textContent = text;
                return div.innerHTML;
            }

            /**
             * Find and process all chart blocks
             */
            async processAllCharts() {
                // Search for both chart and chart-pro (exclude processed)
                const chartBlocks = document.querySelectorAll(
                    'code[class*="language-chart"]:not([data-gfmr-chart-processed]), ' +
                    'code.language-chart:not([data-gfmr-chart-processed]), ' +
                    'code.language-chart-pro:not([data-gfmr-chart-processed])'
                );

                console.log(`[GFMR Charts] Found ${chartBlocks.length} chart blocks`);

                for (const block of chartBlocks) {
                    block.setAttribute('data-gfmr-chart-processed', 'true');

                    const content = block.textContent || '';

                    try {
                        const config = this.parseChartConfig(content);
                        await this.renderChart(block, config);
                    } catch (error) {
                        this.renderErrorMessage(block, error.message);
                    }
                }
            }
        }

        // Initialize and export
        function initializeCharts() {
            const charts = new WPGFMCharts();
            global.wpGfmCharts = charts;

            // If Chart.js is already loaded, apply theme defaults
            if (global.Chart) {
                charts.applyThemeToDefaults();
            }

            return charts;
        }

        global.WPGFMCharts = WPGFMCharts;
        global.wpGfmInitializeCharts = initializeCharts;

    })(typeof window !== 'undefined' ? window : global);