Merge Chat Message Windows

Problem Overview

You are given an existing API: python def get_chat_messages(message_id: int) -> list[Message]: For a given message_id, it returns the surrounding chat context:

• up to 5 messages before
• the message itself
• up to 5 messages after

The Message class has the following properties:

• id: the unique identifier of the message
• content: the text content of the message
• timestamp: the time at which the message was sent

Your task is to implement a function that merges chat message windows for a given list of message IDs. The merged chat message window should contain:

• the message with the earliest timestamp
• all messages between the earliest and latest message IDs (inclusive), maintaining their original order

Constraints

• The input list of message IDs will contain between 1 and 100 IDs.
• Each message ID will be unique.
• The get_chat_messages API will always return a list of 11 messages (5 before, the message itself, and 5 after).
• The Message class will have the properties id, content, and timestamp.

Examples

Example 1

Input: python message_ids = [101, 102, 103, 104, 105] Output: A merged chat message window containing all messages between the earliest and latest message IDs (inclusive), maintaining their original order.

Example 2

Input: python message_ids = [205, 207, 203, 202] Output: A merged chat message window containing all messages between the earliest and latest message IDs (inclusive), maintaining their original order.

Hints

• First, determine the earliest and latest message IDs from the input list.
• Then, iterate through the range of message IDs and use the get_chat_messages API to fetch each message window.
• Merge the message windows while maintaining the original order of messages.
• Handle cases where message IDs are adjacent or overlapping in the chat history.

Solution

`python class Message: def init(self, id, content, timestamp): self.id = id self.content = content self.timestamp = timestamp

def get_chat_messages(message_id: int) -> list[Message]: # Simulated API call # Replace with actual API call in production code pass

def merge_chat_message_windows(message_ids: list[int]) -> list[Message]: if not message_ids: return []

# Find the earliest and latest message IDs
earliest_id = min(message_ids)
latest_id = max(message_ids)

# Initialize the merged chat message window
merged_window = []

# Iterate through the range of message IDs
for mid in range(earliest_id, latest_id + 1):
    messages = get_chat_messages(mid)
    
    # Find the index of the current message in the message window
    current_message_index = next((i for i, msg in enumerate(messages) if msg.id == mid), None)
    
    if current_message_index is not None:
        # Add messages before and after the current message to the merged window
        merged_window.extend(messages[max(0, current_message_index - 5):current_message_index + 6])

# Remove duplicates and sort by timestamp
merged_window = list(dict.fromkeys(merged_window, key=lambda x: x.id))
merged_window.sort(key=lambda x: x.timestamp)

return merged_window

`

Note: The actual implementation of the get_chat_messages API is not provided, as it is assumed to be an existing API call. Replace the simulated API call with the actual API call in production code.