# Copyright 2025 Google LLC
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# SPDX-License-Identifier: Apache-2.0
"""Chats for case 03."""
from pydantic import BaseModel
from genkit.core.typing import Message
class ChatSessionInputSchema(BaseModel):
"""Input for starting a chat session."""
session_id: str
question: str
class ChatSessionOutputSchema(BaseModel):
"""Output for a chat session."""
session_id: str
history: list[Message]
ChatHistory = list[Message]
class ChatHistoryStore:
"""Store for chat history."""
def __init__(self, preamble: ChatHistory | None = None):
"""Initialize the store."""
self.preamble = preamble if preamble is not None else []
self.sessions: dict[str, ChatHistory] = {}
def write(self, session_id: str, history: ChatHistory):
"""Write history for a session."""
self.sessions[session_id] = history
def read(self, session_id: str) -> ChatHistory:
"""Read history for a session."""
return self.sessions.get(session_id, self.preamble)
