# @warkypublic/resolvespec-js v1.0.0

TypeScript client library for ResolveSpec APIs. Supports body-based REST, header-based REST, and WebSocket protocols. Aligns with Go backend types.

## Clients

| Client | Protocol | Singleton Factory |
|---|---|---|
| `ResolveSpecClient` | REST (body JSON) | `getResolveSpecClient(config)` |
| `HeaderSpecClient` | REST (HTTP headers) | `getHeaderSpecClient(config)` |
| `WebSocketClient` | WebSocket | `getWebSocketClient(config)` |

Singleton factories cache instances keyed by URL.

## Config

```typescript
interface ClientConfig {
  baseUrl: string;
  token?: string;  // Bearer token
}

interface WebSocketClientConfig {
  url: string;
  reconnect?: boolean;
  reconnectInterval?: number;
  maxReconnectAttempts?: number;
  heartbeatInterval?: number;
  debug?: boolean;
}
```

## ResolveSpecClient (Body-Based REST)

```typescript
import { ResolveSpecClient, getResolveSpecClient } from '@warkypublic/resolvespec-js';

const client = new ResolveSpecClient({ baseUrl: 'http://localhost:3000', token: 'your-token' });

// CRUD - signature: (schema, entity, id?, options?)
await client.read('public', 'users', undefined, { columns: ['id', 'name'], limit: 10 });
await client.read('public', 'users', 42);                          // by ID
await client.create('public', 'users', { name: 'New' });           // create
await client.update('public', 'users', { name: 'Updated' }, 42);   // update
await client.delete('public', 'users', 42);                        // delete
await client.getMetadata('public', 'users');                        // table metadata
```

**Method signatures:**
- `read<T>(schema, entity, id?: number|string|string[], options?): Promise<APIResponse<T>>`
- `create<T>(schema, entity, data: any|any[], options?): Promise<APIResponse<T>>`
- `update<T>(schema, entity, data: any|any[], id?: number|string|string[], options?): Promise<APIResponse<T>>`
- `delete(schema, entity, id: number|string): Promise<APIResponse<void>>`
- `getMetadata(schema, entity): Promise<APIResponse<TableMetadata>>`

## HeaderSpecClient (Header-Based REST)

```typescript
import { HeaderSpecClient, getHeaderSpecClient } from '@warkypublic/resolvespec-js';

const client = new HeaderSpecClient({ baseUrl: 'http://localhost:3000', token: 'your-token' });

// CRUD - HTTP methods: GET=read, POST=create, PUT=update, DELETE=delete
await client.read('public', 'users', undefined, { columns: ['id', 'name'], limit: 50 });
await client.create('public', 'users', { name: 'New' });
await client.update('public', 'users', '42', { name: 'Updated' });
await client.delete('public', 'users', '42');
```

**Method signatures:**
- `read<T>(schema, entity, id?: string, options?): Promise<APIResponse<T>>`
- `create<T>(schema, entity, data, options?): Promise<APIResponse<T>>`
- `update<T>(schema, entity, id: string, data, options?): Promise<APIResponse<T>>`
- `delete(schema, entity, id: string): Promise<APIResponse<void>>`

### Header Mapping

| Header | Options Field | Format |
|---|---|---|
| `X-Select-Fields` | `columns` | comma-separated |
| `X-Not-Select-Fields` | `omit_columns` | comma-separated |
| `X-FieldFilter-{col}` | `filters` (eq, AND) | value |
| `X-SearchOp-{op}-{col}` | `filters` (AND) | value |
| `X-SearchOr-{op}-{col}` | `filters` (OR) | value |
| `X-Sort` | `sort` | `+col` asc, `-col` desc |
| `X-Limit` / `X-Offset` | `limit` / `offset` | number |
| `X-Cursor-Forward` | `cursor_forward` | string |
| `X-Cursor-Backward` | `cursor_backward` | string |
| `X-Preload` | `preload` | `Rel:col1,col2` pipe-separated |
| `X-Fetch-RowNumber` | `fetch_row_number` | string |
| `X-CQL-SEL-{col}` | `computedColumns` | expression |
| `X-Custom-SQL-W` | `customOperators` | SQL AND-joined |

### Utility Functions

```typescript
import { buildHeaders, encodeHeaderValue, decodeHeaderValue } from '@warkypublic/resolvespec-js';

buildHeaders({ columns: ['id', 'name'], limit: 10 });
// => { 'X-Select-Fields': 'id,name', 'X-Limit': '10' }

encodeHeaderValue('complex value');   // 'ZIP_...' (base64 encoded)
decodeHeaderValue(encoded);           // original string
```

## WebSocketClient

```typescript
import { WebSocketClient, getWebSocketClient } from '@warkypublic/resolvespec-js';

const ws = new WebSocketClient({ url: 'ws://localhost:8080/ws', reconnect: true, heartbeatInterval: 30000 });
await ws.connect();

// CRUD
await ws.read('users', { schema: 'public', limit: 10, filters: [...], columns: [...] });
await ws.create('users', { name: 'New' }, { schema: 'public' });
await ws.update('users', '1', { name: 'Updated' }, { schema: 'public' });
await ws.delete('users', '1', { schema: 'public' });
await ws.meta('users', { schema: 'public' });

// Subscriptions
const subId = await ws.subscribe('users', (notification) => { ... }, { schema: 'public', filters: [...] });
await ws.unsubscribe(subId);
ws.getSubscriptions();

// Connection
ws.getState();      // 'connecting' | 'connected' | 'disconnecting' | 'disconnected' | 'reconnecting'
ws.isConnected();
ws.disconnect();

// Events
ws.on('connect', () => {});
ws.on('disconnect', (event: CloseEvent) => {});
ws.on('error', (error: Error) => {});
ws.on('message', (message: WSMessage) => {});
ws.on('stateChange', (state: ConnectionState) => {});
ws.off('connect');
```

## Options (Query Parameters)

```typescript
interface Options {
  columns?: string[];
  omit_columns?: string[];
  filters?: FilterOption[];
  sort?: SortOption[];
  limit?: number;
  offset?: number;
  preload?: PreloadOption[];
  customOperators?: CustomOperator[];
  computedColumns?: ComputedColumn[];
  parameters?: Parameter[];
  cursor_forward?: string;
  cursor_backward?: string;
  fetch_row_number?: string;
}
```

### FilterOption

```typescript
interface FilterOption {
  column: string;
  operator: Operator | string;
  value: any;
  logic_operator?: 'AND' | 'OR';
}

// Operators: eq, neq, gt, gte, lt, lte, like, ilike, in,
//            contains, startswith, endswith, between,
//            between_inclusive, is_null, is_not_null
```

### SortOption

```typescript
interface SortOption {
  column: string;
  direction: 'asc' | 'desc' | 'ASC' | 'DESC';
}
```

### PreloadOption

```typescript
interface PreloadOption {
  relation: string;
  table_name?: string;
  columns?: string[];
  omit_columns?: string[];
  sort?: SortOption[];
  filters?: FilterOption[];
  where?: string;
  limit?: number;
  offset?: number;
  updatable?: boolean;
  computed_ql?: Record<string, string>;
  recursive?: boolean;
  primary_key?: string;
  related_key?: string;
  foreign_key?: string;
  recursive_child_key?: string;
  sql_joins?: string[];
  join_aliases?: string[];
}
```

### Other Types

```typescript
interface ComputedColumn { name: string; expression: string; }
interface CustomOperator { name: string; sql: string; }
interface Parameter { name: string; value: string; sequence?: number; }
```

## Response Types

```typescript
interface APIResponse<T = any> {
  success: boolean;
  data: T;
  metadata?: Metadata;
  error?: APIError;
}

interface APIError { code: string; message: string; details?: any; detail?: string; }
interface Metadata { total: number; count: number; filtered: number; limit: number; offset: number; row_number?: number; }

interface TableMetadata {
  schema: string;
  table: string;
  columns: Column[];
  relations: string[];
}

interface Column { name: string; type: string; is_nullable: boolean; is_primary: boolean; is_unique: boolean; has_index: boolean; }
```

## WebSocket Message Types

```typescript
type MessageType = 'request' | 'response' | 'notification' | 'subscription' | 'error' | 'ping' | 'pong';
type WSOperation = 'read' | 'create' | 'update' | 'delete' | 'subscribe' | 'unsubscribe' | 'meta';

interface WSMessage {
  id?: string; type: MessageType; operation?: WSOperation;
  schema?: string; entity?: string; record_id?: string;
  data?: any; options?: WSOptions; subscription_id?: string;
  success?: boolean; error?: WSErrorInfo; metadata?: Record<string, any>; timestamp?: string;
}

interface WSNotificationMessage {
  type: 'notification'; operation: WSOperation; subscription_id: string;
  schema?: string; entity: string; data: any; timestamp: string;
}
```

## Dependencies

- Runtime: `uuid`
- Peer: none
- Node >= 18