121 lines
4.4 KiB
Python
121 lines
4.4 KiB
Python
"""Manages the chat history and communication with the AI model API."""
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import os
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from dotenv import load_dotenv
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import requests
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import json
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load_dotenv()
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class ChatManager:
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"""Handles sending messages and maintaining conversation history.
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Connects to an OpenAI-compatible REST endpoint configured via environment
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variables. All messages (user, assistant, system) are kept in memory so
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the full conversation is sent with every request.
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"""
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def __init__(self):
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self.api_host = os.getenv("HOST")
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self.api_port = os.getenv("PORT")
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self.api_key = os.getenv("API_KEY")
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self.model = os.getenv("MODEL")
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self.max_tokens = 2000
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# API endpoint URL (OpenAI-compatible format)
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self.api_url = f"http://{self.api_host}:{self.api_port}/v1/chat/completions"
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# Chat history stored in memory
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self.chat_history = []
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def add_message(self, role: str, content: str) -> None:
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"""Append a single message to the conversation history."""
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self.chat_history.append({"role": role, "content": content})
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def get_history(self) -> list:
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"""Return a copy of the conversation history."""
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return list(self.chat_history)
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# REVIEW: dead code — clear_history() is never called anywhere in the codebase.
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def clear_history(self) -> None:
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"""Wipe the conversation history (starts a fresh chat)."""
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self.chat_history = []
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def send_message(self, user_message: str) -> str:
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"""Send a user message to the AI and return its reply.
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Adds the user message to history, calls the API with the full history
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as context, and appends the AI reply to history before returning it.
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"""
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# Add user message to history
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self.add_message("user", user_message)
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try:
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# Prepare request to OpenAI-compatible API
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headers = {
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"Content-Type": "application/json",
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}
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# Add API key if available
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if self.api_key and self.api_key != "EMPTY":
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headers["Authorization"] = f"Bearer {self.api_key}"
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# Full history is sent so the model has multi-turn conversation context
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payload = {
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"model": self.model,
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"messages": self.chat_history,
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"temperature": 0.7,
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"max_tokens": self.max_tokens,
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"stream": False,
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}
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# Make API request
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response = requests.post(
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self.api_url, headers=headers, json=payload, timeout=30
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)
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# Check if request was successful
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if response.status_code != 200:
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error_msg = f"API Error {response.status_code}: {response.text}"
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raise Exception(error_msg)
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# Parse response
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response_data = response.json()
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# Extract AI message
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if "choices" in response_data and len(response_data["choices"]) > 0:
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ai_message = response_data["choices"][0]["message"]["content"]
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# Add AI response to history
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self.add_message("assistant", ai_message)
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return ai_message
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else:
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raise Exception("Invalid API response format")
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except requests.exceptions.RequestException as e:
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error_msg = f"Connection Error: {str(e)}"
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# Add error message to history so user sees it
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self.add_message("assistant", f"Error: {error_msg}")
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raise Exception(error_msg)
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except json.JSONDecodeError as e:
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error_msg = f"JSON Decode Error: {str(e)}"
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self.add_message("assistant", f"Error: {error_msg}")
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raise Exception(error_msg)
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except Exception as e:
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error_msg = f"Error: {str(e)}"
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self.add_message("assistant", f"Error: {error_msg}")
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raise Exception(error_msg)
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# REVIEW: dead code — get_chat_display() is never called anywhere in the codebase.
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# The UI renders st.session_state.chat_history directly. This method also does the
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# same thing as get_history() (returns a copy of chat_history with the same fields),
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# making it redundant even if it were used.
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def get_chat_display(self) -> list:
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"""Return a copy of the history suitable for display in the UI."""
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return [
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{"role": msg["role"], "content": msg["content"]}
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for msg in self.chat_history
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]
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