/**
 * COMPREHENSIVE ERROR PATTERN INGESTION
 * =====================================
 * Ingests curated error patterns from authoritative sources:
 * - Node.js system errors
 * - HTTP status codes
 * - PostgreSQL error codes
 * - TypeScript compiler errors
 */

const API_BASE = 'http://localhost:3001/api/healing';

async function ingestPattern(pattern) {
  try {
    const res = await fetch(`${API_BASE}/knowledge/ingest`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(pattern)
    });
    const data = await res.json();
    return data.isNew;
  } catch (e) {
    console.error(`Failed to ingest: ${pattern.signature.substring(0, 50)}...`);
    return false;
  }
}

// ═══════════════════════════════════════════════════════════════════════════
// NODE.JS SYSTEM ERRORS
// ═══════════════════════════════════════════════════════════════════════════

const nodeErrors = [
  {
    source: 'nodejs-system',
    category: 'network',
    severity: 'high',
    signature: 'ECONNREFUSED',
    description: 'Connection refused - target service is not running or not accepting connections',
    solutions: [
      { description: 'Verify the target service is running', confidence: 0.95, source: 'nodejs-docs', verified: true },
      { description: 'Check if the port number is correct', confidence: 0.9, source: 'nodejs-docs', verified: true },
      { description: 'Ensure firewall allows the connection', confidence: 0.8, source: 'community', verified: true },
      { description: 'Use 127.0.0.1 instead of localhost for local connections', confidence: 0.75, source: 'stackoverflow', verified: true }
    ],
    tags: ['network', 'connection', 'socket', 'tcp']
  },
  {
    source: 'nodejs-system',
    category: 'network',
    severity: 'medium',
    signature: 'ETIMEDOUT',
    description: 'Operation timed out - connection or send request failed due to no response',
    solutions: [
      { description: 'Implement retry with exponential backoff', confidence: 0.9, source: 'best-practices', verified: true },
      { description: 'Increase timeout value in request options', confidence: 0.85, source: 'nodejs-docs', verified: true },
      { description: 'Check network connectivity and DNS resolution', confidence: 0.8, source: 'community', verified: true },
      { description: 'Ensure socket.end() is called properly', confidence: 0.7, source: 'nodejs-docs', verified: true }
    ],
    tags: ['network', 'timeout', 'socket']
  },
  {
    source: 'nodejs-system',
    category: 'network',
    severity: 'high',
    signature: 'ENOTFOUND',
    description: 'DNS lookup failed - hostname could not be resolved',
    solutions: [
      { description: 'Verify the hostname is spelled correctly', confidence: 0.95, source: 'nodejs-docs', verified: true },
      { description: 'Check DNS configuration and /etc/hosts', confidence: 0.85, source: 'community', verified: true },
      { description: 'Use IP address instead of hostname to test', confidence: 0.8, source: 'debugging', verified: true },
      { description: 'Remove protocol prefix (https://) from host property', confidence: 0.9, source: 'stackoverflow', verified: true }
    ],
    tags: ['network', 'dns', 'hostname']
  },
  {
    source: 'nodejs-system',
    category: 'network',
    severity: 'medium',
    signature: 'ECONNRESET',
    description: 'Connection reset by peer - remote side forcibly closed connection',
    solutions: [
      { description: 'Implement automatic retry logic', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Check if server has connection timeout settings', confidence: 0.8, source: 'community', verified: true },
      { description: 'Ensure keep-alive is properly configured', confidence: 0.75, source: 'nodejs-docs', verified: true },
      { description: 'Check for network instability or proxy issues', confidence: 0.7, source: 'debugging', verified: true }
    ],
    tags: ['network', 'connection', 'reset']
  },
  {
    source: 'nodejs-system',
    category: 'network',
    severity: 'high',
    signature: 'EADDRINUSE',
    description: 'Address already in use - port is bound by another process',
    solutions: [
      { description: 'Use a different port number', confidence: 0.95, source: 'nodejs-docs', verified: true },
      { description: 'Find and kill the process using the port: lsof -i :PORT or netstat -anp | grep PORT', confidence: 0.9, source: 'linux-admin', verified: true },
      { description: 'Wait for TIME_WAIT to expire or enable SO_REUSEADDR', confidence: 0.8, source: 'networking', verified: true },
      { description: 'Check for zombie processes from previous runs', confidence: 0.75, source: 'debugging', verified: true }
    ],
    tags: ['network', 'port', 'binding']
  },
  {
    source: 'nodejs-system',
    category: 'runtime',
    severity: 'high',
    signature: 'EMFILE',
    description: 'Too many open files - system file descriptor limit reached',
    solutions: [
      { description: 'Increase system file descriptor limit: ulimit -n 65535', confidence: 0.9, source: 'linux-admin', verified: true },
      { description: 'Ensure file handles are properly closed after use', confidence: 0.95, source: 'best-practices', verified: true },
      { description: 'Use graceful-fs package for automatic retry', confidence: 0.85, source: 'npm', verified: true },
      { description: 'Implement connection pooling for databases', confidence: 0.8, source: 'best-practices', verified: true }
    ],
    tags: ['files', 'resources', 'limit']
  },
  {
    source: 'nodejs-system',
    category: 'network',
    severity: 'medium',
    signature: 'EPIPE',
    description: 'Broken pipe - write to a connection that has been closed',
    solutions: [
      { description: 'Handle the error event on the socket', confidence: 0.9, source: 'nodejs-docs', verified: true },
      { description: 'Check if connection is still open before writing', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Implement proper connection state management', confidence: 0.8, source: 'community', verified: true }
    ],
    tags: ['network', 'pipe', 'socket']
  },
  {
    source: 'nodejs-system',
    category: 'network',
    severity: 'high',
    signature: 'EHOSTUNREACH',
    description: 'Host unreachable - no route to the specified host',
    solutions: [
      { description: 'Check network connectivity and routing tables', confidence: 0.9, source: 'networking', verified: true },
      { description: 'Verify the target host IP/hostname is correct', confidence: 0.85, source: 'debugging', verified: true },
      { description: 'Check VPN connection if accessing private network', confidence: 0.8, source: 'community', verified: true }
    ],
    tags: ['network', 'routing', 'host']
  },
  {
    source: 'nodejs-system',
    category: 'memory',
    severity: 'critical',
    signature: 'FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - JavaScript heap out of memory',
    description: 'Node.js ran out of heap memory',
    solutions: [
      { description: 'Increase heap size: node --max-old-space-size=4096', confidence: 0.95, source: 'nodejs-docs', verified: true },
      { description: 'Check for memory leaks using heapdump or memwatch', confidence: 0.9, source: 'best-practices', verified: true },
      { description: 'Stream large data instead of loading into memory', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Use pagination for large database queries', confidence: 0.8, source: 'optimization', verified: true }
    ],
    tags: ['memory', 'heap', 'oom', 'critical']
  },
  {
    source: 'nodejs-system',
    category: 'performance',
    severity: 'high',
    signature: 'Event loop blocked',
    description: 'Synchronous operations blocking the event loop',
    solutions: [
      { description: 'Replace sync file operations with async versions', confidence: 0.95, source: 'nodejs-docs', verified: true },
      { description: 'Use Worker Threads for CPU-intensive tasks', confidence: 0.9, source: 'nodejs-docs', verified: true },
      { description: 'Break up large computations with setImmediate()', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Profile with clinic.js to identify blockers', confidence: 0.8, source: 'tooling', verified: true }
    ],
    tags: ['performance', 'event-loop', 'blocking']
  }
];

// ═══════════════════════════════════════════════════════════════════════════
// HTTP STATUS CODE ERRORS
// ═══════════════════════════════════════════════════════════════════════════

const httpErrors = [
  {
    source: 'http-standards',
    category: 'api',
    severity: 'medium',
    signature: 'HTTP 400 Bad Request',
    description: 'Server could not understand the request due to invalid syntax',
    solutions: [
      { description: 'Validate request body against expected schema', confidence: 0.95, source: 'http-spec', verified: true },
      { description: 'Check Content-Type header matches body format', confidence: 0.9, source: 'http-spec', verified: true },
      { description: 'Ensure all required fields are present', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'URL-encode special characters in query parameters', confidence: 0.8, source: 'http-spec', verified: true }
    ],
    tags: ['http', 'client-error', 'validation']
  },
  {
    source: 'http-standards',
    category: 'authentication',
    severity: 'high',
    signature: 'HTTP 401 Unauthorized',
    description: 'Authentication credentials are missing or invalid',
    solutions: [
      { description: 'Check if auth token is present in request headers', confidence: 0.95, source: 'http-spec', verified: true },
      { description: 'Verify token has not expired', confidence: 0.9, source: 'security', verified: true },
      { description: 'Ensure correct authentication scheme (Bearer, Basic)', confidence: 0.85, source: 'http-spec', verified: true },
      { description: 'Refresh the access token if using OAuth', confidence: 0.8, source: 'oauth-spec', verified: true }
    ],
    tags: ['http', 'auth', 'security', '401']
  },
  {
    source: 'http-standards',
    category: 'authentication',
    severity: 'high',
    signature: 'HTTP 403 Forbidden',
    description: 'Server understood request but refuses to authorize it',
    solutions: [
      { description: 'Check user permissions/roles for the resource', confidence: 0.95, source: 'http-spec', verified: true },
      { description: 'Verify API key has correct scopes', confidence: 0.9, source: 'api-design', verified: true },
      { description: 'Check if IP is whitelisted if IP filtering is enabled', confidence: 0.8, source: 'security', verified: true },
      { description: 'Review access control policies', confidence: 0.75, source: 'security', verified: true }
    ],
    tags: ['http', 'authorization', 'security', '403']
  },
  {
    source: 'http-standards',
    category: 'api',
    severity: 'medium',
    signature: 'HTTP 404 Not Found',
    description: 'Server cannot find the requested resource',
    solutions: [
      { description: 'Verify the URL path is correct', confidence: 0.95, source: 'http-spec', verified: true },
      { description: 'Check if resource ID exists in database', confidence: 0.9, source: 'api-design', verified: true },
      { description: 'Ensure API version prefix is correct', confidence: 0.85, source: 'api-design', verified: true },
      { description: 'Check for trailing slashes in URL', confidence: 0.7, source: 'debugging', verified: true }
    ],
    tags: ['http', 'not-found', '404']
  },
  {
    source: 'http-standards',
    category: 'api',
    severity: 'medium',
    signature: 'HTTP 405 Method Not Allowed',
    description: 'HTTP method is not supported for this resource',
    solutions: [
      { description: 'Check Allow header for supported methods', confidence: 0.95, source: 'http-spec', verified: true },
      { description: 'Verify correct HTTP verb (GET/POST/PUT/DELETE)', confidence: 0.9, source: 'api-design', verified: true },
      { description: 'Check if route is registered for this method', confidence: 0.85, source: 'debugging', verified: true }
    ],
    tags: ['http', 'method', '405']
  },
  {
    source: 'http-standards',
    category: 'api',
    severity: 'high',
    signature: 'HTTP 429 Too Many Requests',
    description: 'Rate limit exceeded - too many requests sent',
    solutions: [
      { description: 'Implement exponential backoff retry logic', confidence: 0.95, source: 'best-practices', verified: true },
      { description: 'Check Retry-After header for wait time', confidence: 0.9, source: 'http-spec', verified: true },
      { description: 'Implement request queuing/throttling', confidence: 0.85, source: 'architecture', verified: true },
      { description: 'Consider upgrading API plan for higher limits', confidence: 0.6, source: 'business', verified: true }
    ],
    tags: ['http', 'rate-limit', '429', 'throttling']
  },
  {
    source: 'http-standards',
    category: 'runtime',
    severity: 'critical',
    signature: 'HTTP 500 Internal Server Error',
    description: 'Server encountered an unexpected condition',
    solutions: [
      { description: 'Check server logs for stack trace', confidence: 0.95, source: 'debugging', verified: true },
      { description: 'Add proper error handling middleware', confidence: 0.9, source: 'best-practices', verified: true },
      { description: 'Validate all inputs before processing', confidence: 0.85, source: 'security', verified: true },
      { description: 'Ensure database connections are available', confidence: 0.8, source: 'operations', verified: true }
    ],
    tags: ['http', 'server-error', '500', 'critical']
  },
  {
    source: 'http-standards',
    category: 'network',
    severity: 'high',
    signature: 'HTTP 502 Bad Gateway',
    description: 'Gateway/proxy received invalid response from upstream',
    solutions: [
      { description: 'Check if upstream service is running', confidence: 0.95, source: 'operations', verified: true },
      { description: 'Verify upstream service URL configuration', confidence: 0.9, source: 'configuration', verified: true },
      { description: 'Check network connectivity between services', confidence: 0.85, source: 'networking', verified: true },
      { description: 'Review proxy timeout settings', confidence: 0.8, source: 'configuration', verified: true }
    ],
    tags: ['http', 'gateway', 'proxy', '502']
  },
  {
    source: 'http-standards',
    category: 'runtime',
    severity: 'high',
    signature: 'HTTP 503 Service Unavailable',
    description: 'Server is not ready to handle request (overloaded or maintenance)',
    solutions: [
      { description: 'Implement circuit breaker pattern', confidence: 0.9, source: 'architecture', verified: true },
      { description: 'Check Retry-After header and retry later', confidence: 0.85, source: 'http-spec', verified: true },
      { description: 'Scale up server resources or add instances', confidence: 0.8, source: 'operations', verified: true },
      { description: 'Implement health checks and load balancing', confidence: 0.75, source: 'architecture', verified: true }
    ],
    tags: ['http', 'unavailable', '503', 'scaling']
  },
  {
    source: 'http-standards',
    category: 'network',
    severity: 'high',
    signature: 'HTTP 504 Gateway Timeout',
    description: 'Gateway/proxy did not receive timely response from upstream',
    solutions: [
      { description: 'Increase upstream service timeout', confidence: 0.9, source: 'configuration', verified: true },
      { description: 'Optimize slow backend operations', confidence: 0.85, source: 'optimization', verified: true },
      { description: 'Implement async processing for long operations', confidence: 0.8, source: 'architecture', verified: true },
      { description: 'Add caching layer to reduce backend load', confidence: 0.75, source: 'architecture', verified: true }
    ],
    tags: ['http', 'timeout', 'gateway', '504']
  }
];

// ═══════════════════════════════════════════════════════════════════════════
// POSTGRESQL ERRORS
// ═══════════════════════════════════════════════════════════════════════════

const postgresErrors = [
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'high',
    signature: 'SQLSTATE 08001',
    description: 'Connection attempt to database failed',
    solutions: [
      { description: 'Verify database server is running', confidence: 0.95, source: 'postgresql-docs', verified: true },
      { description: 'Check connection string parameters (host, port, database)', confidence: 0.9, source: 'postgresql-docs', verified: true },
      { description: 'Verify pg_hba.conf allows connection from client', confidence: 0.85, source: 'postgresql-docs', verified: true },
      { description: 'Check firewall rules allow connection', confidence: 0.8, source: 'networking', verified: true }
    ],
    tags: ['database', 'postgresql', 'connection']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'medium',
    signature: 'SQLSTATE 21000',
    description: 'Subquery result is not single row when single row expected',
    solutions: [
      { description: 'Add LIMIT 1 to subquery', confidence: 0.9, source: 'postgresql-docs', verified: true },
      { description: 'Use aggregate function (MAX, MIN) if single value needed', confidence: 0.85, source: 'sql-best-practices', verified: true },
      { description: 'Review data to understand why multiple rows returned', confidence: 0.8, source: 'debugging', verified: true }
    ],
    tags: ['database', 'postgresql', 'subquery']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'high',
    signature: 'SQLSTATE 23505',
    description: 'Duplicate key violation - unique constraint violated',
    solutions: [
      { description: 'Use ON CONFLICT DO UPDATE for upsert operations', confidence: 0.95, source: 'postgresql-docs', verified: true },
      { description: 'Check if record already exists before insert', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Use INSERT ... ON CONFLICT DO NOTHING to skip duplicates', confidence: 0.8, source: 'postgresql-docs', verified: true },
      { description: 'Review unique constraint definition', confidence: 0.7, source: 'schema-design', verified: true }
    ],
    tags: ['database', 'postgresql', 'unique', 'constraint']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'high',
    signature: 'SQLSTATE 23503',
    description: 'Foreign key violation - referenced row does not exist',
    solutions: [
      { description: 'Ensure parent record exists before inserting child', confidence: 0.95, source: 'postgresql-docs', verified: true },
      { description: 'Use CASCADE on delete if orphans should be removed', confidence: 0.85, source: 'schema-design', verified: true },
      { description: 'Implement proper transaction ordering', confidence: 0.8, source: 'best-practices', verified: true }
    ],
    tags: ['database', 'postgresql', 'foreign-key', 'constraint']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'medium',
    signature: 'SQLSTATE 42601',
    description: 'SQL syntax error',
    solutions: [
      { description: 'Check query for missing/extra commas, parentheses', confidence: 0.9, source: 'debugging', verified: true },
      { description: 'Verify column and table names are correct', confidence: 0.85, source: 'debugging', verified: true },
      { description: 'Use parameterized queries to avoid injection issues', confidence: 0.95, source: 'security', verified: true },
      { description: 'Quote reserved words used as identifiers', confidence: 0.8, source: 'postgresql-docs', verified: true }
    ],
    tags: ['database', 'postgresql', 'syntax']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'medium',
    signature: 'SQLSTATE 42703',
    description: 'Undefined column - column does not exist',
    solutions: [
      { description: 'Check column name spelling and case', confidence: 0.95, source: 'postgresql-docs', verified: true },
      { description: 'Verify column exists in correct table (use table alias)', confidence: 0.9, source: 'debugging', verified: true },
      { description: 'Run pending migrations if column was recently added', confidence: 0.85, source: 'operations', verified: true }
    ],
    tags: ['database', 'postgresql', 'column']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'medium',
    signature: 'SQLSTATE 42P01',
    description: 'Undefined table - relation does not exist',
    solutions: [
      { description: 'Check table name spelling and schema prefix', confidence: 0.95, source: 'postgresql-docs', verified: true },
      { description: 'Verify search_path includes correct schema', confidence: 0.85, source: 'postgresql-docs', verified: true },
      { description: 'Run pending migrations if table was recently created', confidence: 0.9, source: 'operations', verified: true }
    ],
    tags: ['database', 'postgresql', 'table']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'critical',
    signature: 'SQLSTATE 53200',
    description: 'Out of memory - insufficient memory for operation',
    solutions: [
      { description: 'Increase work_mem configuration', confidence: 0.85, source: 'postgresql-docs', verified: true },
      { description: 'Optimize query to use less memory', confidence: 0.9, source: 'optimization', verified: true },
      { description: 'Add indexes to avoid large sorts', confidence: 0.8, source: 'optimization', verified: true },
      { description: 'Consider query pagination for large result sets', confidence: 0.85, source: 'best-practices', verified: true }
    ],
    tags: ['database', 'postgresql', 'memory', 'critical']
  },
  {
    source: 'postgresql-official',
    category: 'database',
    severity: 'high',
    signature: 'SQLSTATE 53300',
    description: 'Too many connections',
    solutions: [
      { description: 'Implement connection pooling (PgBouncer, built-in pool)', confidence: 0.95, source: 'best-practices', verified: true },
      { description: 'Increase max_connections in postgresql.conf', confidence: 0.8, source: 'postgresql-docs', verified: true },
      { description: 'Close idle connections promptly', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Review application connection lifecycle', confidence: 0.8, source: 'debugging', verified: true }
    ],
    tags: ['database', 'postgresql', 'connections', 'pool']
  },
  {
    source: 'postgresql-official',
    category: 'concurrency',
    severity: 'high',
    signature: 'SQLSTATE 40P01',
    description: 'Deadlock detected',
    solutions: [
      { description: 'Order operations consistently across transactions', confidence: 0.9, source: 'postgresql-docs', verified: true },
      { description: 'Keep transactions short', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Use SELECT FOR UPDATE NOWAIT to fail fast', confidence: 0.8, source: 'postgresql-docs', verified: true },
      { description: 'Implement retry logic with backoff', confidence: 0.85, source: 'best-practices', verified: true }
    ],
    tags: ['database', 'postgresql', 'deadlock', 'concurrency']
  }
];

// ═══════════════════════════════════════════════════════════════════════════
// TYPESCRIPT ERRORS
// ═══════════════════════════════════════════════════════════════════════════

const typescriptErrors = [
  {
    source: 'typescript-compiler',
    category: 'type',
    severity: 'medium',
    signature: "TS2322: Type 'X' is not assignable to type 'Y'",
    description: 'Type mismatch - attempting to assign incompatible type',
    solutions: [
      { description: 'Check variable type declaration matches assigned value', confidence: 0.95, source: 'typescript-docs', verified: true },
      { description: 'Use type assertion if types are compatible at runtime', confidence: 0.7, source: 'typescript-docs', verified: true },
      { description: 'Add proper type guard before assignment', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Update type definition to accept both types (union type)', confidence: 0.8, source: 'typescript-docs', verified: true }
    ],
    tags: ['typescript', 'type', 'assignment']
  },
  {
    source: 'typescript-compiler',
    category: 'type',
    severity: 'medium',
    signature: "TS2339: Property 'X' does not exist on type 'Y'",
    description: 'Accessing property that does not exist on the type',
    solutions: [
      { description: 'Add the property to the interface/type definition', confidence: 0.9, source: 'typescript-docs', verified: true },
      { description: 'Use optional chaining (?.) if property might not exist', confidence: 0.85, source: 'typescript-docs', verified: true },
      { description: 'Check if accessing property on correct variable', confidence: 0.8, source: 'debugging', verified: true },
      { description: 'Use type assertion if property exists at runtime', confidence: 0.7, source: 'typescript-docs', verified: true }
    ],
    tags: ['typescript', 'type', 'property']
  },
  {
    source: 'typescript-compiler',
    category: 'type',
    severity: 'medium',
    signature: "TS2345: Argument of type 'X' is not assignable to parameter of type 'Y'",
    description: 'Function called with wrong argument type',
    solutions: [
      { description: 'Check function signature and provide correct types', confidence: 0.95, source: 'typescript-docs', verified: true },
      { description: 'Transform data to expected type before calling', confidence: 0.85, source: 'best-practices', verified: true },
      { description: 'Update function signature if it should accept more types', confidence: 0.8, source: 'typescript-docs', verified: true }
    ],
    tags: ['typescript', 'type', 'argument', 'function']
  },
  {
    source: 'typescript-compiler',
    category: 'type',
    severity: 'high',
    signature: "TS2531: Object is possibly 'null'",
    description: 'Accessing object that could be null without null check',
    solutions: [
      { description: 'Add null check before accessing: if (obj !== null)', confidence: 0.95, source: 'typescript-docs', verified: true },
      { description: 'Use optional chaining: obj?.property', confidence: 0.9, source: 'typescript-docs', verified: true },
      { description: 'Use non-null assertion if certain value exists: obj!', confidence: 0.7, source: 'typescript-docs', verified: true },
      { description: 'Use nullish coalescing for default: obj ?? defaultValue', confidence: 0.85, source: 'typescript-docs', verified: true }
    ],
    tags: ['typescript', 'null', 'strictNullChecks']
  },
  {
    source: 'typescript-compiler',
    category: 'type',
    severity: 'high',
    signature: "TS2532: Object is possibly 'undefined'",
    description: 'Accessing object that could be undefined without check',
    solutions: [
      { description: 'Add undefined check: if (obj !== undefined)', confidence: 0.95, source: 'typescript-docs', verified: true },
      { description: 'Use optional chaining: obj?.property', confidence: 0.9, source: 'typescript-docs', verified: true },
      { description: 'Provide default value: obj ?? defaultValue', confidence: 0.85, source: 'typescript-docs', verified: true }
    ],
    tags: ['typescript', 'undefined', 'strictNullChecks']
  },
  {
    source: 'typescript-compiler',
    category: 'type',
    severity: 'low',
    signature: 'TS7006: Parameter implicitly has an any type',
    description: 'Function parameter missing type annotation in strict mode',
    solutions: [
      { description: 'Add explicit type annotation to parameter', confidence: 0.95, source: 'typescript-docs', verified: true },
      { description: 'Set noImplicitAny: false in tsconfig (not recommended)', confidence: 0.5, source: 'typescript-docs', verified: true }
    ],
    tags: ['typescript', 'any', 'strict']
  },
  {
    source: 'typescript-compiler',
    category: 'dependency',
    severity: 'medium',
    signature: "TS2307: Cannot find module 'X' or its corresponding type declarations",
    description: 'Module or types not found',
    solutions: [
      { description: 'Install the package: npm install X', confidence: 0.9, source: 'npm', verified: true },
      { description: 'Install type definitions: npm install -D @types/X', confidence: 0.95, source: 'typescript-docs', verified: true },
      { description: 'Check module path is correct (relative vs package)', confidence: 0.85, source: 'debugging', verified: true },
      { description: 'Create declaration file: declare module "X"', confidence: 0.7, source: 'typescript-docs', verified: true }
    ],
    tags: ['typescript', 'module', 'types', 'import']
  },
  {
    source: 'typescript-compiler',
    category: 'syntax',
    severity: 'high',
    signature: 'TS1005: Expected X',
    description: 'Syntax error - expected token missing',
    solutions: [
      { description: 'Check for missing semicolons, brackets, or parentheses', confidence: 0.95, source: 'debugging', verified: true },
      { description: 'Verify arrow function syntax: () => {}', confidence: 0.85, source: 'typescript-docs', verified: true },
      { description: 'Check for unclosed string literals', confidence: 0.8, source: 'debugging', verified: true }
    ],
    tags: ['typescript', 'syntax', 'parsing']
  },
  {
    source: 'typescript-compiler',
    category: 'runtime',
    severity: 'critical',
    signature: "TypeError: Cannot read property 'X' of undefined",
    description: 'Runtime error accessing property on undefined value',
    solutions: [
      { description: 'Add null/undefined check before access', confidence: 0.95, source: 'best-practices', verified: true },
      { description: 'Use optional chaining: obj?.property', confidence: 0.9, source: 'javascript', verified: true },
      { description: 'Check data flow to find where undefined originates', confidence: 0.85, source: 'debugging', verified: true },
      { description: 'Initialize variables with default values', confidence: 0.8, source: 'best-practices', verified: true }
    ],
    tags: ['typescript', 'runtime', 'undefined', 'critical']
  },
  {
    source: 'typescript-compiler',
    category: 'runtime',
    severity: 'critical',
    signature: "TypeError: X is not a function",
    description: 'Attempting to call something that is not a function',
    solutions: [
      { description: 'Check variable is actually a function before calling', confidence: 0.95, source: 'debugging', verified: true },
      { description: 'Verify import statement brings in correct export', confidence: 0.9, source: 'debugging', verified: true },
      { description: 'Check this binding if method is passed as callback', confidence: 0.85, source: 'javascript', verified: true },
      { description: 'Ensure async functions are awaited properly', confidence: 0.8, source: 'best-practices', verified: true }
    ],
    tags: ['typescript', 'runtime', 'function', 'critical']
  }
];

// ═══════════════════════════════════════════════════════════════════════════
// MAIN INGESTION
// ═══════════════════════════════════════════════════════════════════════════

async function main() {
  console.log('╔═══════════════════════════════════════════════════════════════════════════╗');
  console.log('║             COMPREHENSIVE ERROR PATTERN INGESTION                         ║');
  console.log('╚═══════════════════════════════════════════════════════════════════════════╝\n');

  const stats = { total: 0, new: 0, updated: 0 };

  // Ingest Node.js errors
  console.log('📦 Ingesting Node.js system errors...');
  for (const pattern of nodeErrors) {
    stats.total++;
    const isNew = await ingestPattern(pattern);
    if (isNew) stats.new++; else stats.updated++;
    process.stdout.write('.');
  }
  console.log(` ✓ ${nodeErrors.length} patterns`);

  // Ingest HTTP errors
  console.log('🌐 Ingesting HTTP status codes...');
  for (const pattern of httpErrors) {
    stats.total++;
    const isNew = await ingestPattern(pattern);
    if (isNew) stats.new++; else stats.updated++;
    process.stdout.write('.');
  }
  console.log(` ✓ ${httpErrors.length} patterns`);

  // Ingest PostgreSQL errors
  console.log('🐘 Ingesting PostgreSQL errors...');
  for (const pattern of postgresErrors) {
    stats.total++;
    const isNew = await ingestPattern(pattern);
    if (isNew) stats.new++; else stats.updated++;
    process.stdout.write('.');
  }
  console.log(` ✓ ${postgresErrors.length} patterns`);

  // Ingest TypeScript errors
  console.log('📘 Ingesting TypeScript errors...');
  for (const pattern of typescriptErrors) {
    stats.total++;
    const isNew = await ingestPattern(pattern);
    if (isNew) stats.new++; else stats.updated++;
    process.stdout.write('.');
  }
  console.log(` ✓ ${typescriptErrors.length} patterns`);

  console.log('\n═══════════════════════════════════════════════════════════════════════════');
  console.log(`✅ COMPLETE: ${stats.total} patterns processed`);
  console.log(`   New: ${stats.new} | Updated: ${stats.updated}`);
  console.log('═══════════════════════════════════════════════════════════════════════════\n');

  // Persist to Neo4j
  console.log('💾 Persisting to Neo4j...');
  try {
    const res = await fetch(`${API_BASE}/persist`, { method: 'POST' });
    const data = await res.json();
    console.log(`   ✓ ${data.success} patterns persisted to database\n`);
  } catch (e) {
    console.log('   ⚠ Neo4j persistence skipped (service not available)\n');
  }

  // Get final stats
  try {
    const res = await fetch(`${API_BASE}/knowledge/stats`);
    const stats = await res.json();
    console.log('📊 FINAL KNOWLEDGE BASE STATS:');
    console.log(`   Total patterns: ${stats.totalPatterns}`);
    console.log(`   Total solutions: ${stats.totalSolutions}`);
    console.log('   Sources:', Object.entries(stats.bySource || {}).map(([k,v]) => `${k}:${v}`).join(', '));
  } catch (e) {
    console.log('   Could not fetch final stats');
  }
}

main().catch(console.error);