# Task ID: 6
# Title: Implement, Document, & Test `getMessages` Endpoint
# Status: done
# Dependencies: 1
# Priority: high
# Description: Implement the `getMessages` method, write JSDoc/TSDoc documentation, and develop unit tests. Ensure adherence to SDK conventions for API calls, error handling, and authentication.
# Details:
Functional Requirement 4.5: Method: getMessages(session: string, chatId: string, options: GetMessagesOptions): Promise. API Call: GET /api/{session}/chats/{chatId}/messages. Parameters: session (path, required), chatId (path, required), limit (query, required), offset (query, optional), downloadMedia (query, optional), filter.timestamp.lte, filter.timestamp.gte, filter.fromMe, filter.ack. Response: Array of WAMessage objects. Adhere to NFRs.

# Test Strategy:
Unit tests for message retrieval with pagination, media download option, various filter combinations, error handling, and parameter validation.

# Subtasks:
## 1. Implement `getMessages` Method Structure and Path Parameter Handling [done]
### Dependencies: None
### Description: Implement the `getMessages` method structure, basic API call construction (GET /api/{session}/chats/{chatId}/messages), and handling of path parameters (session, chatId).
### Details:
Define the function signature for `getMessages`. Implement the core logic to construct the API request URL using `session` and `chatId` path parameters. Ensure basic request sending mechanism is in place.

## 2. Implement Query Parameter Handling for `GetMessagesOptions` [done]
### Dependencies: 6.1
### Description: Implement handling for query parameters within the `GetMessagesOptions` object: `limit`, `offset`, and `downloadMedia`.
### Details:
Extend the `getMessages` method to process `limit`, `offset`, and `downloadMedia` from the `GetMessagesOptions` input. Append these as query parameters to the API request if provided.

## 3. Implement Filter Parameter Handling for `GetMessagesOptions` [done]
### Dependencies: 6.1
### Description: Implement handling for filter parameters within the `GetMessagesOptions` object: `filter.timestamp.lte`, `filter.timestamp.gte`, `filter.fromMe`, `filter.ack`.
### Details:
Extend `getMessages` to parse `filter.timestamp.lte`, `filter.timestamp.gte`, `filter.fromMe`, and `filter.ack` from `GetMessagesOptions`. Construct and append corresponding query parameters for filtering.

## 4. Integrate SDK-Conventional Error Handling and Authentication [done]
### Dependencies: 6.1
### Description: Integrate SDK-conventional error handling and authentication mechanisms for the `getMessages` method.
### Details:
Implement robust error handling for API responses (e.g., 4xx, 5xx errors) and network issues, translating them into SDK-standard errors. Ensure authentication tokens/mechanisms are correctly applied to API requests.

## 5. Write Comprehensive JSDoc/TSDoc Documentation [done]
### Dependencies: 6.1, 6.2, 6.3, 6.4
### Description: Write comprehensive JSDoc/TSDoc documentation for the `getMessages` method, its parameters (including `GetMessagesOptions`), and return type (`Promise<WAMessage[]>`).
### Details:
Document the method's purpose, all input parameters including the detailed structure and purpose of `GetMessagesOptions` and its sub-properties (limit, offset, downloadMedia, filters). Clearly specify the structure and type of the resolved `Promise<WAMessage[]>`.

## 6. Develop Unit Tests for Success, Pagination, and `downloadMedia` [done]
### Dependencies: 6.1, 6.2, 6.4
### Description: Develop unit tests for `getMessages` covering successful message retrieval, pagination (limit/offset), and the `downloadMedia` option.
### Details:
Create test cases to verify: successful retrieval of messages, correct application of `limit` and `offset` for paginating results, and the behavior when `downloadMedia` is true/false. Mock API responses as needed.

## 7. Develop Unit Tests for Filter Parameter Combinations [done]
### Dependencies: 6.1, 6.3, 6.4
### Description: Develop unit tests for `getMessages` covering various combinations of filter parameters (timestamp, fromMe, ack).
### Details:
Create test cases to validate the functionality of each filter parameter (`filter.timestamp.lte`, `filter.timestamp.gte`, `filter.fromMe`, `filter.ack`) individually and in meaningful combinations. Mock API responses to simulate filtered results.

## 8. Develop Unit Tests for Error Handling and Parameter Validation [done]
### Dependencies: 6.1, 6.2, 6.3, 6.4
### Description: Develop unit tests for `getMessages` covering error handling (e.g., invalid parameters, API errors, authentication failures) and parameter validation.
### Details:
Create test cases to ensure: proper error reporting for invalid input parameters (e.g., incorrect types, missing required fields), correct handling of simulated API errors (e.g., 401, 403, 404, 500), and authentication failure scenarios.

