# UDF SDK Documentation

## Table of Contents
- [Installation](#installation)
- [Quick Start](#quick-start)
- [API Reference](#api-reference)
- [Examples](#examples)
- [Error Handling](#error-handling)

## Installation

You can install the package using npm:

```bash
npm install @entangle-labs/udf-sdk
```

Or using yarn:

```bash
yarn add @entangle-labs/udf-sdk
```

## Quick Start

```typescript
import { UdfSdk } from '@entangle-labs/udf-sdk';

// Initialize SDK
const sdk = new UdfSdk();

// Get latest price data
async function getEthPrice() {
  // Get median price
  const median = await sdk.getMedian('ETH/USD');
  console.log('ETH/USD Median Price:', median);

  // Get all votes
  const votes = await sdk.getVotes(['ETH/USD']);
  console.log('All votes:', votes);

  // Get update call data
  const callData = await sdk.getCallData(['ETH/USD']);
  console.log('Update call data:', callData);
}
```

## API Reference

### Class: UdfSdk

#### Constructor

```typescript
constructor(baseUrl?: string)
```

Creates a new instance of UdfSdk.
- `baseUrl` (optional): Base URL for the UDF API. Defaults to 'https://udfsnap.ent-dx.com/'

#### Methods

##### getMedian(feedKey: string): Promise<number>

Gets the median price for a specific feed.
- `feedKey`: The feed identifier (e.g., 'ETH/USD')
- Returns: Promise resolving to the median price value

```typescript
const median = await sdk.getMedian('ETH/USD');
```

##### getVotes(feedKeys: string[]): Promise<DecodedVote[]>

Gets all votes for specified feeds.
- `feedKeys`: Array of feed identifiers
- Returns: Promise resolving to array of decoded votes

```typescript
const votes = await sdk.getVotes(['ETH/USD', 'BTC/USD']);
```

##### getCallData(feedKeys: string[]): Promise<string>

Gets the update call data for specified feeds.
- `feedKeys`: Array of feed identifiers
- Returns: Promise resolving to update call data string

```typescript
const callData = await sdk.getCallData(['ETH/USD']);
```

## Examples

### Getting Multiple Feed Data

```typescript
async function getMultipleFeeds() {
  const sdk = new UdfSdk();
  const feeds = ['ETH/USD', 'BTC/USD'];

  // Get all feed data
  const votes = await sdk.getVotes(feeds);
  
  // Process votes
  for (const vote of votes) {
    console.log(`${vote.feedKey}: ${vote.value} (from ${vote.publisher})`);
  }
}
```

### Custom Base URL

```typescript
const sdk = new UdfSdk('https://your-custom-url.com');
```

## Error Handling

The SDK throws errors in the following cases:

1. Network Errors
```typescript
try {
  await sdk.getVotes(['ETH/USD']);
} catch (error) {
  if (error.message.includes('HTTP error')) {
    console.error('Network error:', error);
  }
}
```

2. Invalid Data Errors
```typescript
try {
  const median = await sdk.getMedian('ETH/USD');
} catch (error) {
  if (error.message.includes('No votes provided')) {
    console.error('No data available:', error);
  }
}
```

## Requirements

- Node.js 16 or higher