# All comments are in English.

import uuid

class ChatStore:
    """Simple in-memory chat store with multiple conversations."""

    def __init__(self):
        self.conversations = {}

    def new_conversation(self):
        cid = str(uuid.uuid4())
        self.conversations[cid] = []
        return cid

    def add_message(self, cid, role, content):
        self.conversations[cid].append({"role": role, "content": content})

    def get_messages(self, cid):
        return self.conversations.get(cid, [])