// module-debug-supervisor.js — Persistent error capture, clustering, root-cause analysis, and auto-fix
// Commands: debug-stats, debug-history, debug-analyze, debug-trends, debug-fix, debug-health
class DebugSupervisorModule {
    constructor() {
        this.commands = {};
        this.terminal = null;
        this._healthy = true;
        this._errorDB = { errors: {}, clusters: {}, patterns: {}, sessionId: null };
        this._maxErrors = 500;
        this._ttlDays = 7;
        this._writeDebounce = null;
        this._pendingWrites = 0;
        this._originalConsole = {};
        this._originalOnError = null;
        this._originalOnRejection = null;
        this._originalFetch = null;
        this._interceptorInstalled = false;
        this._sessionId = this._generateSessionId();
    }

    _generateSessionId() {
        try {
            let sid = localStorage.getItem('webx11_debug_session');
            if (!sid) {
                sid = Date.now().toString(36) + '-' + Math.random().toString(36).substring(2, 8);
                localStorage.setItem('webx11_debug_session', sid);
            }
            return sid;
        } catch (e) {
            return Date.now().toString(36);
        }
    }

    getHelpInfo() {
        return {
            'debug-stats': 'debug-stats — Show error summary (total, unique, clusters, top issues)',
            'debug-history': 'debug-history [n] — Show last N errors (default: 20)',
            'debug-analyze': 'debug-analyze <hash> — Deep analysis of a specific error',
            'debug-trends': 'debug-trends [days] — Error frequency over time (default: 7)',
            'debug-fix': 'debug-fix <hash> — Suggest and optionally apply fix for an error',
            'debug-health': 'debug-health — Check supervisor module health status',
            'debug-sync': 'debug-sync [url] — Sync errors to backend API (or set sync URL)',
            'debug-sync-url': 'debug-sync-url [url] — View or set the backend sync endpoint',
        };
    }

    registerCommands() {
        this.commands['debug-stats'] = () => this._cmdStats();
        this.commands['debug-history'] = (args) => this._cmdHistory(args);
        this.commands['debug-analyze'] = (args) => this._cmdAnalyze(args);
        this.commands['debug-trends'] = (args) => this._cmdTrends(args);
        this.commands['debug-fix'] = (args) => this._cmdFix(args);
        this.commands['debug-health'] = () => this._cmdHealth();
        this.commands['debug-sync'] = (args) => this._cmdSync(args);
        this.commands['debug-sync-url'] = (args) => this._cmdSyncUrl(args);
    }

    seed() {
        // seed() is not called automatically by module manager — interceptors go in init()
    }

    init() {
        this._loadDB();
        this._installInterceptors();
        // Start periodic sync (every 5 minutes)
        this._syncInterval = setInterval(() => this._syncToBackend(), 300000);
        // Also sync on first load after a short delay
        setTimeout(() => this._syncToBackend(), 5000);
    }

    destroy() {
        // Clear sync interval
        if (this._syncInterval) {
            clearInterval(this._syncInterval);
            this._syncInterval = null;
        }
        // Restore original console.error
        if (this._originalConsole.error) {
            console.error = this._originalConsole.error;
        }
        // Restore original window.onerror
        if (this._originalOnError) {
            window.onerror = this._originalOnError;
        }
        // Restore original fetch
        if (this._originalFetch) {
            window.fetch = this._originalFetch;
        }
        // Remove unhandledrejection listener (stored for cleanup)
        if (this._rejectionHandler) {
            window.removeEventListener('unhandledrejection', this._rejectionHandler);
        }
        this._interceptorInstalled = false;
        this._healthy = false;
    }

    // ── Error Database ──

    _loadDB() {
        try {
            const raw = localStorage.getItem('webx11_debug_db');
            if (raw) {
                const parsed = JSON.parse(raw);
                this._errorDB = parsed;
                this._pruneExpired();
            }
        } catch (e) {
            // Corrupted DB — start fresh
            this._errorDB = { errors: {}, clusters: {}, patterns: {}, sessionId: this._sessionId };
        }
    }

    _saveDB() {
        try {
            localStorage.setItem('webx11_debug_db', JSON.stringify(this._errorDB));
        } catch (e) {
            // Quota exceeded — evict oldest 20% and retry
            this._evictLRU(0.2);
            try {
                localStorage.setItem('webx11_debug_db', JSON.stringify(this._errorDB));
            } catch (e2) {
                // Still failing — supervisor degrades gracefully
                console.warn('[DebugSupervisor] DB write failed, errors may be lost');
            }
        }
    }

    _scheduleSave() {
        this._pendingWrites++;
        if (this._writeDebounce) return;
        this._writeDebounce = setTimeout(() => {
            this._writeDebounce = null;
            if (this._pendingWrites > 0) {
                this._saveDB();
                this._pendingWrites = 0;
            }
        }, 2000);
    }

    _pruneExpired() {
        const now = Date.now();
        const maxAge = this._ttlDays * 86400000;
        let changed = false;
        for (const [hash, entry] of Object.entries(this._errorDB.errors)) {
            if (now - entry.lastSeen > maxAge) {
                delete this._errorDB.errors[hash];
                changed = true;
            }
        }
        if (changed) this._saveDB();
    }

    _evictLRU(fraction) {
        const entries = Object.entries(this._errorDB.errors);
        const sorted = entries.sort((a, b) => a[1].lastSeen - b[1].lastSeen);
        const toRemove = Math.ceil(sorted.length * fraction);
        for (let i = 0; i < toRemove; i++) {
            delete this._errorDB.errors[sorted[i][0]];
        }
    }

    _checkQuota() {
        try {
            // Test localStorage is writable
            const testKey = '__quota_test__';
            localStorage.setItem(testKey, '1');
            localStorage.removeItem(testKey);
            return true;
        } catch (e) {
            return false;
        }
    }

    // ── Error Classification ──

    _classifyError(message, source, stack) {
        const type = this._detectType(message, stack);
        const severity = this._detectSeverity(type, message);
        const category = this._detectCategory(message, source, type);
        return { type, severity, category };
    }

    _detectType(message, stack) {
        if (!message) return 'unknown';
        if (message.includes('ReferenceError') || message.includes('is not defined')) return 'ReferenceError';
        if (message.includes('TypeError') || message.includes('is not a function') || message.includes('cannot read property')) return 'TypeError';
        if (message.includes('SyntaxError') || message.includes('Unexpected token')) return 'SyntaxError';
        if (message.includes('HTTP') || message.includes('NetworkError') || message.includes('Failed to fetch')) return 'HTTP';
        if (message.includes('timeout') || message.includes('Timeout') || message.includes('AbortError')) return 'timeout';
        if (message.includes('QuotaExceededError') || message.includes('quota')) return 'quota';
        if (message.includes('SecurityError') || message.includes('permission')) return 'security';
        if (stack && stack.includes('tool_')) return 'tool';
        return 'runtime';
    }

    _detectSeverity(type, message) {
        if (type === 'SyntaxError' || type === 'ReferenceError' || type === 'quota') return 'fatal';
        if (type === 'HTTP' && /\b5\d{2}\b/.test(message)) return 'error';
        if (type === 'timeout' || type === 'security') return 'error';
        if (type === 'tool') return 'warning';
        return 'error';
    }

    _detectCategory(message, source, type) {
        if (type === 'HTTP' || type === 'timeout') return 'network';
        if (type === 'quota') return 'vfs';
        if (type === 'security') return 'security';
        if (source && (source.includes('module-') || source.includes('ext/'))) return 'module';
        if (type === 'tool') return 'tool';
        return 'runtime';
    }

    _extractModule(source) {
        if (!source) return null;
        const m = source.match(/(module-[a-z-]+)\.js/);
        return m ? m[1] : null;
    }

    _computeHash(message, source, type) {
        const raw = (message || '') + '|' + (source || '') + '|' + (type || '');
        // Simple hash (Fowler-Noll-Vo)
        let hash = 0x811c9dc5;
        for (let i = 0; i < raw.length; i++) {
            hash ^= raw.charCodeAt(i);
            hash = Math.imul(hash, 0x01000193);
        }
        return (hash >>> 0).toString(16);
    }

    // ── Error Interception ──

    _installInterceptors() {
        if (this._interceptorInstalled) return;
        const self = this;

        // Console.error
        this._originalConsole.error = console.error;
        console.error = function() {
            const args = Array.prototype.slice.call(arguments);
            const msg = args.map(a => typeof a === 'object' ? (a.message || JSON.stringify(a)) : String(a)).join(' ');
            self._recordError(msg, 'console.error', null);
            return self._originalConsole.error.apply(console, args);
        };

        // window.onerror
        this._originalOnError = window.onerror;
        window.onerror = function(msg, src, line, col, err) {
            const fullMsg = msg + (err ? ' — ' + err.message : '') + ' (' + src + ':' + line + ':' + col + ')';
            self._recordError(fullMsg, src || 'window.onerror', err ? err.stack : null);
            if (self._originalOnError) return self._originalOnError.call(window, msg, src, line, col, err);
        };

        // Unhandled rejections
        this._originalOnRejection = window.onunhandledrejection;
        this._rejectionHandler = function(e) {
            const msg = e.reason ? (e.reason.message || String(e.reason)) : 'Unhandled Promise rejection';
            self._recordError(msg, 'unhandledrejection', e.reason ? e.reason.stack : null);
        };
        window.addEventListener('unhandledrejection', this._rejectionHandler);

        // Fetch failures
        this._originalFetch = window.fetch;
        window.fetch = function() {
            const args = arguments;
            const url = typeof args[0] === 'string' ? args[0] : (args[0]?.url || '?');
            // Never record failures of the debug-sync endpoint itself: that produced a
            // self-referential loop (38,495 identical "Fetch failed …/ingest.php" entries).
            if (url.indexOf('/api/debug/') !== -1) return self._originalFetch.apply(window, args);
            return self._originalFetch.apply(window, args).catch(function(err) {
                self._recordError('Fetch failed: ' + url + ' — ' + (err.message || err), url, err.stack);
                throw err;
            });
        };

        this._interceptorInstalled = true;
    }

    // ── Record Error ──

    recordToolError(toolName, args, errorMessage) {
        this._recordError(errorMessage, 'tool:' + toolName, null);
    }

    _recordError(message, source, stack) {
        if (!this._healthy) return;
        const classification = this._classifyError(message, source, stack);
        const hash = this._computeHash(message, source, classification.type);
        const now = Date.now();

        if (this._errorDB.errors[hash]) {
            this._errorDB.errors[hash].count++;
            this._errorDB.errors[hash].lastSeen = now;
            if (this._errorDB.errors[hash].sessions.indexOf(this._sessionId) === -1) {
                this._errorDB.errors[hash].sessions.push(this._sessionId);
            }
        } else {
            // LRU eviction if at cap
            const keys = Object.keys(this._errorDB.errors);
            if (keys.length >= this._maxErrors) {
                this._evictLRU(0.1);
            }
            this._errorDB.errors[hash] = {
                count: 1,
                firstSeen: now,
                lastSeen: now,
                message: message,
                type: classification.type,
                severity: classification.severity,
                category: classification.category,
                source: source,
                stack: stack ? stack.split('\n').slice(0, 10).join('\n') : null,
                module: this._extractModule(source),
                sessions: [this._sessionId],
            };
        }

        this._scheduleSave();
    }

    // ── Clustering (Jaccard similarity) ──

    _normalizeMessage(msg) {
        if (!msg) return '';
        return msg
            .toLowerCase()
            .replace(/\b0x[a-f0-9]+\b/g, '0xHEX')
            .replace(/\b\d+\b/g, 'N')
            .replace(/["'].*?["']/g, '"STR"')
            .replace(/[^\w\s]/g, ' ')
            .replace(/\s+/g, ' ')
            .trim();
    }

    _jaccardSimilarity(a, b) {
        const setA = new Set(a.split(' ').filter(Boolean));
        const setB = new Set(b.split(' ').filter(Boolean));
        if (setA.size === 0 && setB.size === 0) return 1;
        let intersection = 0;
        for (const token of setA) {
            if (setB.has(token)) intersection++;
        }
        const union = setA.size + setB.size - intersection;
        return union === 0 ? 0 : intersection / union;
    }

    _clusterErrors() {
        const errors = Object.entries(this._errorDB.errors);
        if (errors.length === 0) return [];

        const clusters = [];
        const assigned = new Set();

        for (let i = 0; i < errors.length; i++) {
            if (assigned.has(i)) continue;
            const [hashI, entryI] = errors[i];
            const normI = this._normalizeMessage(entryI.message);
            const cluster = { hashes: [hashI], messages: [entryI.message], count: entryI.count, types: new Set([entryI.type]), categories: new Set([entryI.category]) };
            assigned.add(i);

            for (let j = i + 1; j < errors.length; j++) {
                if (assigned.has(j)) continue;
                const [hashJ, entryJ] = errors[j];
                const normJ = this._normalizeMessage(entryJ.message);
                if (this._jaccardSimilarity(normI, normJ) >= 0.35) {
                    cluster.hashes.push(hashJ);
                    cluster.messages.push(entryJ.message);
                    cluster.count += entryJ.count;
                    cluster.types.add(entryJ.type);
                    cluster.categories.add(entryJ.category);
                    assigned.add(j);
                }
            }

            cluster.label = this._mostFrequent(cluster.messages);
            cluster.typeCount = cluster.types.size;
            cluster.categoryCount = cluster.categories.size;
            delete cluster.types;
            delete cluster.categories;
            clusters.push(cluster);
        }

        clusters.sort((a, b) => b.count - a.count);
        return clusters;
    }

    _mostFrequent(arr) {
        const freq = {};
        let best = arr[0], bestCount = 1;
        for (const item of arr) {
            freq[item] = (freq[item] || 0) + 1;
            if (freq[item] > bestCount) {
                best = item;
                bestCount = freq[item];
            }
        }
        return best;
    }

    // ── Root-Cause Analysis ──

    _analyzeRootCause(hash) {
        const entry = this._errorDB.errors[hash];
        if (!entry) return { found: false };

        const findings = [];
        const fixes = [];

        // Tool failure → check module
        if (entry.source && entry.source.startsWith('tool:')) {
            const toolName = entry.source.replace('tool:', '');
            const mm = this.terminal?.moduleManager;
            if (mm) {
                // Check if any module has this command
                let found = false;
                for (const [modName, mod] of Object.entries(mm.modules)) {
                    if (mod.commands && mod.commands[toolName]) {
                        found = true;
                        break;
                    }
                }
                if (!found) {
                    findings.push({ type: 'module_not_loaded', detail: 'No module provides command "' + toolName + '"' });
                    fixes.push({ action: 'loadmod', params: toolName, description: 'Load module providing ' + toolName });
                }
            }
        }

        // HTTP error → check network
        if (entry.type === 'HTTP' || entry.type === 'timeout') {
            findings.push({ type: 'network_issue', detail: 'Network request failed: ' + entry.message.substring(0, 100) });
            fixes.push({ action: 'test-net', params: null, description: 'Run network diagnostics' });
        }

        // ReferenceError → check bundle
        if (entry.type === 'ReferenceError') {
            findings.push({ type: 'missing_class', detail: 'ReferenceError suggests a class or variable is not defined' });
            fixes.push({ action: 'reload', params: null, description: 'Reload the page to re-initialize all modules' });
        }

        // Module error → check module loader
        if (entry.category === 'module') {
            findings.push({ type: 'module_error', detail: 'Error in module: ' + (entry.module || 'unknown') });
            fixes.push({ action: 'loadmod', params: entry.module, description: 'Reload module: ' + entry.module });
        }

        return { found: findings.length > 0, findings, fixes };
    }

    // ── Fix Registry ──

    _buildFixSuggestion(hash) {
        const entry = this._errorDB.errors[hash];
        if (!entry) return null;

        const rca = this._analyzeRootCause(hash);
        if (!rca.found) {
            return { confidence: 0, suggestion: 'No known fix pattern for this error', autoApply: false };
        }

        // Calculate confidence based on frequency
        let confidence = Math.min(0.5, entry.count / 10);
        if (entry.count >= 3) confidence = 0.7;
        if (entry.count >= 10) confidence = 0.9;

        return {
            confidence: confidence,
            suggestion: rca.findings.map(f => f.detail).join('; '),
            fixes: rca.fixes,
            autoApply: confidence >= 0.9,
        };
    }

    // ── Terminal Commands ──

    _cmdStats() {
        const db = this._errorDB.errors;
        const keys = Object.keys(db);
        if (keys.length === 0) {
            this.terminal.print('📊 Debug Stats: No errors recorded', 'success');
            return;
        }

        const totalCount = keys.reduce((sum, k) => sum + db[k].count, 0);
        const bySeverity = {};
        const byCategory = {};
        for (const k of keys) {
            const e = db[k];
            bySeverity[e.severity] = (bySeverity[e.severity] || 0) + e.count;
            byCategory[e.category] = (byCategory[e.category] || 0) + e.count;
        }

        const clusters = this._clusterErrors();
        const topClusters = clusters.slice(0, 5);

        this.terminal.print('📊 Debug Stats', 'header');
        this.terminal.print('  Total errors: ' + totalCount, 'info');
        this.terminal.print('  Unique errors: ' + keys.length, 'info');
        this.terminal.print('  Clusters: ' + clusters.length, 'info');
        this.terminal.print('  Session: ' + this._sessionId, 'text-muted');
        this.terminal.print('  Supervisor: ' + (this._healthy ? '✅ healthy' : '🔴 degraded'), this._healthy ? 'success' : 'error');

        this.terminal.print('── By Severity ──', 'info');
        for (const [sev, count] of Object.entries(bySeverity)) {
            const icon = sev === 'fatal' ? '🔴' : sev === 'error' ? '🟡' : '🟢';
            this.terminal.print('  ' + icon + ' ' + sev + ': ' + count, sev === 'fatal' ? 'error' : 'warning');
        }

        this.terminal.print('── By Category ──', 'info');
        for (const [cat, count] of Object.entries(byCategory)) {
            this.terminal.print('  • ' + cat + ': ' + count, 'text-muted');
        }

        if (topClusters.length > 0) {
            this.terminal.print('── Top Clusters ──', 'info');
            for (const c of topClusters) {
                this.terminal.print('  [' + c.hashes.length + ' errors ×' + c.count + '] ' + c.label.substring(0, 80), 'warning');
            }
            this.terminal.print('  Run debug-analyze <hash> for details', 'text-muted');
        }
    }

    _cmdHistory(args) {
        const n = (args && args[0]) ? parseInt(args[0]) : 20;
        const entries = Object.entries(this._errorDB.errors)
            .sort((a, b) => b[1].lastSeen - a[1].lastSeen)
            .slice(0, n);

        if (entries.length === 0) {
            this.terminal.print('No errors recorded', 'success');
            return;
        }

        this.terminal.print('── Error History (last ' + entries.length + ') ──', 'header');
        for (const [hash, e] of entries) {
            const time = new Date(e.lastSeen).toLocaleTimeString();
            const icon = e.severity === 'fatal' ? '🔴' : e.severity === 'error' ? '🟡' : '🟢';
            const msg = e.message.substring(0, 80);
            this.terminal.print('  ' + icon + ' [' + time + '] ' + msg, e.severity === 'fatal' ? 'error' : 'text-muted');
            this.terminal.print('    hash=' + hash + ' type=' + e.type + ' cat=' + e.category + ' ×' + e.count, 'text-muted');
        }
        this.terminal.print('── End ──', 'info');
        this.terminal.print('Run debug-analyze <hash> for details', 'text-muted');
    }

    _cmdAnalyze(args) {
        const hash = (args && args[0]) || '';
        if (!hash) {
            this.terminal.print('Usage: debug-analyze <hash>', 'warning');
            return;
        }

        const entry = this._errorDB.errors[hash];
        if (!entry) {
            this.terminal.print('Error not found: ' + hash, 'error');
            return;
        }

        this.terminal.print('── Error Analysis: ' + hash + ' ──', 'header');
        this.terminal.print('  Message: ' + entry.message, 'info');
        this.terminal.print('  Type: ' + entry.type + ' | Severity: ' + entry.severity + ' | Category: ' + entry.category, 'info');
        this.terminal.print('  Source: ' + (entry.source || '?'), 'text-muted');
        this.terminal.print('  Module: ' + (entry.module || 'unknown'), 'text-muted');
        this.terminal.print('  Count: ' + entry.count + ' | First: ' + new Date(entry.firstSeen).toLocaleString() + ' | Last: ' + new Date(entry.lastSeen).toLocaleString(), 'info');
        this.terminal.print('  Sessions: ' + (entry.sessions || []).length, 'text-muted');
        if (entry.stack) {
            this.terminal.print('── Stack Trace (top 10) ──', 'info');
            this.terminal.print(entry.stack, 'text-muted');
        }

        // Root-cause analysis
        const rca = this._analyzeRootCause(hash);
        if (rca.found) {
            this.terminal.print('── Root Cause Analysis ──', 'warning');
            for (const f of rca.findings) {
                this.terminal.print('  • [' + f.type + '] ' + f.detail, 'warning');
            }
            if (rca.fixes.length > 0) {
                this.terminal.print('── Suggested Fixes ──', 'success');
                for (const fix of rca.fixes) {
                    this.terminal.print('  → ' + fix.action + (fix.params ? ' ' + fix.params : '') + ' — ' + fix.description, 'success');
                }
            }
        } else {
            this.terminal.print('  No root cause identified', 'text-muted');
        }

        // Fix suggestion
        const fix = this._buildFixSuggestion(hash);
        if (fix && fix.confidence > 0) {
            this.terminal.print('── Auto-Fix Confidence: ' + Math.round(fix.confidence * 100) + '% ──', fix.autoApply ? 'success' : 'warning');
            this.terminal.print('  ' + fix.suggestion, 'info');
            if (fix.autoApply) {
                this.terminal.print('  ⚡ Confidence ≥ 90% — fix can be auto-applied with debug-fix ' + hash, 'success');
            }
        }
    }

    _cmdTrends(args) {
        const days = (args && args[0]) ? parseInt(args[0]) : 7;
        const cutoff = Date.now() - days * 86400000;

        const entries = Object.values(this._errorDB.errors).filter(e => e.lastSeen >= cutoff);
        if (entries.length === 0) {
            this.terminal.print('No errors in the last ' + days + ' days', 'success');
            return;
        }

        // Group by day
        const byDay = {};
        for (const e of entries) {
            const day = new Date(e.lastSeen).toISOString().split('T')[0];
            if (!byDay[day]) byDay[day] = { total: 0, byType: {} };
            byDay[day].total += e.count;
            byDay[day].byType[e.type] = (byDay[day].byType[e.type] || 0) + e.count;
        }

        const sortedDays = Object.keys(byDay).sort();
        this.terminal.print('── Error Trends (last ' + days + ' days) ──', 'header');
        for (const day of sortedDays) {
            const d = byDay[day];
            const types = Object.entries(d.byType).map(([t, c]) => t + ':' + c).join(', ');
            this.terminal.print('  ' + day + ': ' + d.total + ' errors (' + types + ')', d.total > 5 ? 'warning' : 'text-muted');
        }

        // Top error types
        const typeTotals = {};
        for (const e of entries) {
            typeTotals[e.type] = (typeTotals[e.type] || 0) + e.count;
        }
        this.terminal.print('── By Type ──', 'info');
        for (const [type, count] of Object.entries(typeTotals).sort((a, b) => b[1] - a[1])) {
            this.terminal.print('  • ' + type + ': ' + count, 'text-muted');
        }
    }

    _cmdFix(args) {
        const hash = (args && args[0]) || '';
        if (!hash) {
            this.terminal.print('Usage: debug-fix <hash>', 'warning');
            return;
        }

        const fix = this._buildFixSuggestion(hash);
        if (!fix || fix.confidence === 0) {
            this.terminal.print('No fix available for error: ' + hash, 'warning');
            return;
        }

        this.terminal.print('── Fix Suggestion for ' + hash + ' ──', 'header');
        this.terminal.print('  Confidence: ' + Math.round(fix.confidence * 100) + '%', fix.autoApply ? 'success' : 'warning');
        this.terminal.print('  Suggestion: ' + fix.suggestion, 'info');

        if (fix.fixes && fix.fixes.length > 0) {
            this.terminal.print('── Available Fixes ──', 'info');
            for (const f of fix.fixes) {
                this.terminal.print('  → ' + f.action + (f.params ? ' ' + f.params : ''), 'success');
                this.terminal.print('    ' + f.description, 'text-muted');
            }
        }

        if (fix.autoApply) {
            this.terminal.print('⚡ Auto-applying fix...', 'info');
            this._applyFix(hash, fix);
        } else {
            this.terminal.print('Confidence below auto-apply threshold. Run the suggested command manually.', 'warning');
        }
    }

    _applyFix(hash, fix) {
        if (!fix.fixes || fix.fixes.length === 0) return;
        const firstFix = fix.fixes[0];
        try {
            // Sanitize params: only allow alphanumeric, hyphens, underscores, dots
            const safeParams = (firstFix.params || '').replace(/[^a-zA-Z0-9_\-\.]/g, '');
            if (firstFix.action === 'loadmod' && this.terminal) {
                this.terminal.executeCommand('loadmod ' + safeParams);
                this.terminal.print('  ✅ Applied: loadmod ' + safeParams, 'success');
            } else if (firstFix.action === 'test-net' && this.terminal) {
                this.terminal.executeCommand('test-net');
                this.terminal.print('  ✅ Applied: test-net', 'success');
            } else if (firstFix.action === 'reload') {
                this.terminal.print('  ℹ️ Manual action needed: reload the page', 'warning');
            } else {
                this.terminal.print('  ℹ️ Cannot auto-apply: ' + firstFix.action, 'warning');
            }
        } catch (e) {
            this.terminal.print('  ❌ Fix failed: ' + e.message, 'error');
        }
    }

    _cmdHealth() {
        this.terminal.print('── DebugSupervisor Health ──', 'header');
        this.terminal.print('  Status: ' + (this._healthy ? '✅ Healthy' : '🔴 Degraded'), this._healthy ? 'success' : 'error');
        this.terminal.print('  Session: ' + this._sessionId, 'text-muted');
        this.terminal.print('  Errors tracked: ' + Object.keys(this._errorDB.errors).length + ' unique', 'info');
        this.terminal.print('  Max errors: ' + this._maxErrors, 'text-muted');
        this.terminal.print('  TTL: ' + this._ttlDays + ' days', 'text-muted');
        this.terminal.print('  Interceptors: ' + (this._interceptorInstalled ? '✅ active' : '🔴 inactive'), this._interceptorInstalled ? 'success' : 'error');
        this.terminal.print('  Quota: ' + (this._checkQuota() ? '✅ available' : '🔴 low'), this._checkQuota() ? 'success' : 'error');
    }

    // ── Sync to Backend ──

    _getSyncUrl() {
        try {
            return localStorage.getItem('webx11_debug_sync_url') || 'https://webx11.duckdns.org/spaces/newos4/api/debug/ingest.php';
        } catch (e) {
            return 'https://webx11.duckdns.org/spaces/newos4/api/debug/ingest.php';
        }
    }

    async _syncToBackend() {
        if (!this._healthy) return;
        const db = this._errorDB.errors;
        const keys = Object.keys(db);
        if (keys.length === 0) return;

        const payload = {
            version: window.NEWOS4_VERSION || 'v4.x',
            session: {
                id: this._sessionId,
                modules: this.terminal?.moduleManager ? Object.keys(this.terminal.moduleManager.modules) : [],
            },
            errors: keys.map(k => ({
                hash: k,
                message: db[k].message,
                type: db[k].type,
                severity: db[k].severity,
                category: db[k].category,
                source: db[k].source,
                module: db[k].module,
                stack: db[k].stack,
                count: db[k].count,
                firstSeen: new Date(db[k].firstSeen).toISOString(),
                lastSeen: new Date(db[k].lastSeen).toISOString(),
            })),
        };

        try {
            const resp = await fetch(this._getSyncUrl(), {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(payload),
                signal: AbortSignal.timeout(10000),
            });
            if (resp.ok) {
                const result = await resp.json();
                if (result.success) {
                    const sent = keys.length;
                    const accepted = result.ingested || 0;
                    if (accepted < sent) {
                        console.warn('[DebugSupervisor] Sync truncated: sent ' + sent + ' errors, server accepted ' + accepted + ' (max ' + (result.total_errors || '?') + ' total)');
                    } else {
                        console.log('[DebugSupervisor] Synced ' + accepted + ' errors to backend');
                    }
                    this._lastSyncOk = Date.now();
                    return true;
                }
            }
            console.warn('[DebugSupervisor] Sync returned HTTP ' + resp.status);
            return false;
        } catch (e) {
            console.warn('[DebugSupervisor] Sync failed: ' + e.message);
            return false;
        }
    }

    _cmdSync(args) {
        const url = (args && args[0]) ? args[0] : null;
        if (url) {
            try {
                localStorage.setItem('webx11_debug_sync_url', url);
                this.terminal.print('✅ Sync URL set to: ' + url, 'success');
            } catch (e) {
                this.terminal.print('❌ Failed to save sync URL', 'error');
            }
            return;
        }
        this.terminal.print('🔄 Syncing errors to backend...', 'info');
        this._syncToBackend().then(ok => {
            if (ok) {
                this.terminal.print('✅ Sync complete', 'success');
            } else {
                this.terminal.print('❌ Sync failed', 'error');
            }
        });
    }

    _cmdSyncUrl(args) {
        if (args && args[0]) {
            try {
                localStorage.setItem('webx11_debug_sync_url', args[0]);
                this.terminal.print('✅ Sync URL set to: ' + args[0], 'success');
            } catch (e) {
                this.terminal.print('❌ Failed to save sync URL', 'error');
            }
        } else {
            this.terminal.print('Current sync URL: ' + this._getSyncUrl(), 'info');
        }
    }

    // ── Dashboard Data ──

    getDashboardData() {
        const db = this._errorDB.errors;
        const keys = Object.keys(db);
        const totalCount = keys.reduce((sum, k) => sum + db[k].count, 0);
        const clusters = this._clusterErrors().slice(0, 5);

        return {
            totalUnique: keys.length,
            totalCount: totalCount,
            clusters: clusters.map(c => ({ label: c.label.substring(0, 60), count: c.count, hashes: c.hashes.length })),
            healthy: this._healthy,
            topType: this._getTopType(db),
            topCategory: this._getTopCategory(db),
        };
    }

    _getTopType(db) {
        const freq = {};
        for (const e of Object.values(db)) {
            freq[e.type] = (freq[e.type] || 0) + e.count;
        }
        const sorted = Object.entries(freq).sort((a, b) => b[1] - a[1]);
        return sorted.length > 0 ? sorted[0][0] : null;
    }

    _getTopCategory(db) {
        const freq = {};
        for (const e of Object.values(db)) {
            freq[e.category] = (freq[e.category] || 0) + e.count;
        }
        const sorted = Object.entries(freq).sort((a, b) => b[1] - a[1]);
        return sorted.length > 0 ? sorted[0][0] : null;
    }
}