ds_zagres_ai/ai_service/api.py

"""
FastAPI application for the AI service.
This service acts as a backend for OpenWebUI, providing OpenWebUI-compatible API endpoints.

The service supports document-based question answering using OpenWebUI's knowledge database:
- Set use_rag=True in API requests to enable Retrieval Augmented Generation
- When enabled, the service will use OpenWebUI's knowledge database to find relevant information
- Documents uploaded to OpenWebUI will be used to augment the model's responses
"""

from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel, Field
from typing import List, Optional
import uuid
import asyncio
from datetime import datetime, timezone

from ai_service.models.model_service import model_service
from ai_service.models.chat_service import chat_service
from ai_service.openwebui_api import router as openwebui_router
from ai_service.config import config
from ai_service import bot_manager

# Create FastAPI app
app = FastAPI(
    title="AI Service API",
    description="Backend API for OpenWebUI",
    version="1.0.0"
)

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # Allow all origins
    allow_credentials=True,
    allow_methods=["*"],  # Allow all methods
    allow_headers=["*"],  # Allow all headers
)

# Include OpenWebUI-compatible API routes
app.include_router(openwebui_router, prefix="/api")

# Include Ollama proxy routes
app.include_router(openwebui_router, prefix="/ollama")

# API startup event
@app.on_event("startup")
async def startup_event():
    """
    Startup event for the API.
    """
    print("=" * 50)
    print(f"Starting AI Service API on {config.API_HOST}:{config.API_PORT}")
    print(f"OpenWebUI URL: {config.OPENWEBUI_URL}")
    print(f"Default model: {config.DEFAULT_MODEL}")

    # Start the OpenWebUI bot if enabled
    if config.BOT_ENABLED:
        print("=" * 50)
        print("Starting OpenWebUI bot...")

        # Check if the OpenWebUI URL and API key are set
        if not config.OPENWEBUI_URL or not config.OPENWEBUI_API_KEY:
            print("ERROR: OpenWebUI URL or API key not set. Bot cannot be started.")
            print("Please set OPENWEBUI_URL and OPENWEBUI_API_KEY in your .env file.")
            print("=" * 50)
        else:
            # Try to start the bot with multiple retries
            max_retries = 3
            retry_delay = 5  # seconds
            success = False

            for attempt in range(1, max_retries + 1):
                print(f"Starting bot (attempt {attempt}/{max_retries})...")

                # Start the bot with configuration
                success = await bot_manager.start_bot(
                    openwebui_url=config.OPENWEBUI_URL,
                    api_key=config.OPENWEBUI_API_KEY,
                    model_id=config.DEFAULT_MODEL,
                    system_prompt=config.BOT_SYSTEM_PROMPT,
                    temperature=config.BOT_TEMPERATURE,
                    max_tokens=config.BOT_MAX_TOKENS,
                    top_p=config.BOT_TOP_P,
                    triggers=config.BOT_TRIGGERS,
                    respond_to_all=config.BOT_RESPOND_TO_ALL
                )

                if success:
                    print("Bot started successfully!")
                    break
                else:
                    print(f"Failed to start bot (attempt {attempt}/{max_retries}).")
                    if attempt < max_retries:
                        print(f"Retrying in {retry_delay} seconds...")
                        await asyncio.sleep(retry_delay)
                    else:
                        print("Maximum retry attempts reached. Bot could not be started.")
                        print("Check the logs for details.")

            print("=" * 50)
    else:
        print("OpenWebUI bot is disabled. Set BOT_ENABLED=true in .env to enable it.")

    print("=" * 50)

# API shutdown event
@app.on_event("shutdown")
async def shutdown_event():
    """
    Shutdown event for the API.
    """
    print("=" * 50)
    print("Shutting down AI Service API...")

    # Stop the OpenWebUI bot if it's running
    if bot_manager.is_bot_running():
        print("Stopping OpenWebUI bot...")
        success = await bot_manager.stop_bot()
        if success:
            print("Bot stopped successfully!")
        else:
            print("Failed to stop bot. Check the logs for details.")

    print("=" * 50)

# Define API models for health check
class HealthResponse(BaseModel):
    """Response model for health check."""
    status: str = Field(..., description="Health status")

class ModelInfo(BaseModel):
    """Model for model information."""
    id: str = Field(..., description="Model ID")
    name: str = Field(..., description="Model name")
    description: str = Field(..., description="Model description")
    provider: str = Field(..., description="Model provider")
    max_tokens: int = Field(..., description="Maximum tokens")
    is_default: bool = Field(..., description="Whether this is the default model")

class ChatRequest(BaseModel):
    """Request model for creating a chat."""
    user_id: str = Field(..., description="User ID")
    title: Optional[str] = Field(None, description="Chat title")
    model_id: Optional[str] = Field(None, description="Model ID")
    is_team_chat: bool = Field(False, description="Whether this is a team chat")

class MessageRequest(BaseModel):
    """Request model for sending a message."""
    message: str = Field(..., description="Message content")
    user_id: str = Field(..., description="User ID")
    use_rag: bool = Field(False, description="Whether to use RAG")

    # Model parameters
    temperature: Optional[float] = Field(None, description="Controls randomness: higher values mean more random completions")
    max_tokens: Optional[int] = Field(None, description="Maximum number of tokens to generate")
    top_p: Optional[float] = Field(None, description="Nucleus sampling parameter")
    frequency_penalty: Optional[float] = Field(None, description="Penalizes repeated tokens")
    presence_penalty: Optional[float] = Field(None, description="Penalizes repeated topics")
    stop_sequences: Optional[List[str]] = Field(None, description="Sequences where the API will stop generating")
    system_prompt: Optional[str] = Field(None, description="System prompt to guide the model's behavior")

    # Additional advanced parameters
    min_p: Optional[float] = Field(None, description="Minimum probability threshold for token selection")
    top_k: Optional[int] = Field(None, description="Only sample from the top k tokens")
    repeat_penalty: Optional[float] = Field(None, description="Penalty for repeating tokens")
    function_calling: Optional[bool] = Field(None, description="Whether to enable function calling")

class Message(BaseModel):
    """Model for a message."""
    id: str = Field(..., description="Message ID")
    content: str = Field(..., description="Message content")
    user_id: Optional[str] = Field(None, description="User ID")
    is_user_message: bool = Field(..., description="Whether this is a user message")
    timestamp: str = Field(..., description="Message timestamp")

class Chat(BaseModel):
    """Model for a chat."""
    id: str = Field(..., description="Chat ID")
    title: str = Field(..., description="Chat title")
    user_id: str = Field(..., description="User ID")
    model_id: str = Field(..., description="Model ID")
    is_team_chat: bool = Field(..., description="Whether this is a team chat")
    created_at: str = Field(..., description="Creation timestamp")
    updated_at: str = Field(..., description="Update timestamp")
    messages: List[Message] = Field(..., description="Chat messages")
    team_members: List[str] = Field(..., description="Team members")

# Define API endpoints
@app.get("/health", response_model=HealthResponse)
async def health_check():
    """
    Health check endpoint.

    Returns:
        Health status.
    """
    return {"status": "healthy"}

@app.get("/config")
async def get_config():
    """
    Get the current configuration.

    Returns:
        Current configuration settings.
    """
    return {
        "api_host": config.API_HOST,
        "api_port": config.API_PORT,
        "openwebui_url": config.OPENWEBUI_URL,
        "ollama_api_url": config.OLLAMA_API_URL,
        "default_model": config.DEFAULT_MODEL,
        "api_timeout": config.API_TIMEOUT,
        "bot": {
            "enabled": config.BOT_ENABLED,
            "running": bot_manager.is_bot_running(),
            "model_id": config.DEFAULT_MODEL,
            "system_prompt": config.BOT_SYSTEM_PROMPT[:50] + "..." if len(config.BOT_SYSTEM_PROMPT) > 50 else config.BOT_SYSTEM_PROMPT,
            "temperature": config.BOT_TEMPERATURE,
            "max_tokens": config.BOT_MAX_TOKENS,
            "top_p": config.BOT_TOP_P,
            "triggers": config.BOT_TRIGGERS,
            "respond_to_all": config.BOT_RESPOND_TO_ALL
        },
        "available_models": list(model_service.AVAILABLE_MODELS.keys())
    }

@app.get("/bot/status")
async def get_bot_status():
    """
    Get the status and configuration of the OpenWebUI bot.

    Returns:
        Bot status and configuration.
    """
    return {
        "enabled": config.BOT_ENABLED,
        "running": bot_manager.is_bot_running(),
        "config": {
            "model_id": config.DEFAULT_MODEL,
            "system_prompt": config.BOT_SYSTEM_PROMPT[:50] + "..." if len(config.BOT_SYSTEM_PROMPT) > 50 else config.BOT_SYSTEM_PROMPT,
            "temperature": config.BOT_TEMPERATURE,
            "max_tokens": config.BOT_MAX_TOKENS,
            "top_p": config.BOT_TOP_P,
            "triggers": config.BOT_TRIGGERS,
            "respond_to_all": config.BOT_RESPOND_TO_ALL
        }
    }

@app.post("/bot/start")
async def start_bot(
    model_id: str = None,
    system_prompt: str = None,
    temperature: float = None,
    max_tokens: int = None,
    top_p: float = None,
    respond_to_all: bool = None
):
    """
    Start the OpenWebUI bot with optional configuration.

    Args:
        model_id: ID of the model to use (default: config.DEFAULT_MODEL)
        system_prompt: System prompt for the bot (default: config.BOT_SYSTEM_PROMPT)
        temperature: Temperature for response generation (default: config.BOT_TEMPERATURE)
        max_tokens: Maximum number of tokens to generate (default: config.BOT_MAX_TOKENS)
        top_p: Top-p sampling parameter (default: config.BOT_TOP_P)
        respond_to_all: Whether to respond to all messages (default: config.BOT_RESPOND_TO_ALL)

    Returns:
        Start status.
    """
    if bot_manager.is_bot_running():
        return {"status": "already_running", "message": "Bot is already running"}

    # Use provided values or defaults from config
    success = await bot_manager.start_bot(
        openwebui_url=config.OPENWEBUI_URL,
        api_key=config.OPENWEBUI_API_KEY,
        model_id=model_id or config.DEFAULT_MODEL,
        system_prompt=system_prompt or config.BOT_SYSTEM_PROMPT,
        temperature=temperature if temperature is not None else config.BOT_TEMPERATURE,
        max_tokens=max_tokens if max_tokens is not None else config.BOT_MAX_TOKENS,
        top_p=top_p if top_p is not None else config.BOT_TOP_P,
        triggers=config.BOT_TRIGGERS,
        respond_to_all=respond_to_all if respond_to_all is not None else config.BOT_RESPOND_TO_ALL
    )

    if success:
        return {
            "status": "success",
            "message": "Bot started successfully",
            "config": {
                "model_id": model_id or config.DEFAULT_MODEL,
                "system_prompt": (system_prompt or config.BOT_SYSTEM_PROMPT)[:50] + "..." if len(system_prompt or config.BOT_SYSTEM_PROMPT) > 50 else (system_prompt or config.BOT_SYSTEM_PROMPT),
                "temperature": temperature if temperature is not None else config.BOT_TEMPERATURE,
                "max_tokens": max_tokens if max_tokens is not None else config.BOT_MAX_TOKENS,
                "top_p": top_p if top_p is not None else config.BOT_TOP_P,
                "respond_to_all": respond_to_all if respond_to_all is not None else config.BOT_RESPOND_TO_ALL
            }
        }
    else:
        return {"status": "error", "message": "Failed to start bot"}

@app.post("/bot/stop")
async def stop_bot():
    """
    Stop the OpenWebUI bot.

    Returns:
        Stop status.
    """
    if not bot_manager.is_bot_running():
        return {"status": "not_running", "message": "Bot is not running"}

    success = await bot_manager.stop_bot()

    if success:
        return {"status": "success", "message": "Bot stopped successfully"}
    else:
        return {"status": "error", "message": "Failed to stop bot"}

# Model endpoints
@app.get("/models", response_model=List[ModelInfo])
async def get_available_models():
    """
    Get available models.

    Returns:
        List of model information.
    """
    models = model_service.get_available_models()
    # Debug log
    print(f"API models: {models}")
    return models

@app.get("/models/{model_id}", response_model=ModelInfo)
async def get_model_info(model_id: str):
    """
    Get information about a model.

    Args:
        model_id: Model ID.

    Returns:
        Model information.
    """
    model_info = model_service.get_model_info(model_id)
    if not model_info:
        raise HTTPException(status_code=404, detail="Model not found")

    return model_info

# Chat endpoints
@app.post("/chats", response_model=Chat)
async def create_chat(request: ChatRequest):
    """
    Create a new chat.

    Args:
        request: Chat creation request.

    Returns:
        Created chat.
    """
    chat_id = chat_service.create_chat(
        user_id=request.user_id,
        title=request.title,
        model_id=request.model_id,
        is_team_chat=request.is_team_chat
    )

    return chat_service.get_chat(chat_id)

@app.get("/chats/user/{user_id}", response_model=List[Chat])
async def get_user_chats(user_id: str):
    """
    Get all chats for a user.

    Args:
        user_id: User ID.

    Returns:
        List of chats.
    """
    return chat_service.get_user_chats(user_id)

@app.get("/chats/{chat_id}", response_model=Chat)
async def get_chat(chat_id: str):
    """
    Get a chat by ID.

    Args:
        chat_id: Chat ID.

    Returns:
        Chat information.
    """
    chat = chat_service.get_chat(chat_id)
    if not chat:
        raise HTTPException(status_code=404, detail="Chat not found")

    return chat

@app.post("/chats/{chat_id}/messages", response_model=Message)
async def send_message(chat_id: str, request: MessageRequest):
    """
    Send a message to a chat.

    Args:
        chat_id: Chat ID.
        request: Message request with optional model parameters.

    Returns:
        Bot response message.
    """
    try:
        print(f"Processing message for chat {chat_id} from user {request.user_id}")
        print(f"Message: {request.message[:50]}...")  # Print first 50 chars of message
        print(f"Using RAG: {request.use_rag}")
        print(f"Model parameters: temperature={request.temperature}, max_tokens={request.max_tokens}")

        # Extract model parameters from the request
        response = chat_service.get_chat_response(
            chat_id=chat_id,
            message=request.message,
            user_id=request.user_id,
            use_rag=request.use_rag,
            temperature=request.temperature,
            max_tokens=request.max_tokens,
            top_p=request.top_p,
            frequency_penalty=request.frequency_penalty,
            presence_penalty=request.presence_penalty,
            stop_sequences=request.stop_sequences,
            system_prompt=request.system_prompt,
            min_p=request.min_p,
            top_k=request.top_k,
            repeat_penalty=request.repeat_penalty,
            function_calling=request.function_calling
        )

        print(f"Response received. Length: {len(response.get('content', ''))}")
        return response

    except ValueError as e:
        error_msg = f"Chat not found: {str(e)}"
        print(f"ERROR: {error_msg}")
        raise HTTPException(status_code=404, detail=error_msg)
    except Exception as e:
        error_msg = f"Error processing message: {str(e)}"
        print(f"ERROR: {error_msg}")
        # Return an error message instead of raising an exception
        # This ensures the client gets a proper response
        return {
            "id": str(uuid.uuid4()),
            "content": f"Error processing message: {str(e)}",
            "user_id": None,
            "is_user_message": False,
            "timestamp": datetime.now(timezone.utc).isoformat()
        }

@app.post("/chats/{chat_id}/members/{user_id}")
async def add_team_member(chat_id: str, user_id: str):
    """
    Add a user to a team chat.

    Args:
        chat_id: Chat ID.
        user_id: User ID.

    Returns:
        Addition status.
    """
    success = chat_service.add_team_member(chat_id, user_id)
    if not success:
        raise HTTPException(status_code=400, detail="Failed to add team member")

    return {"status": "success", "message": "Team member added"}

@app.delete("/chats/{chat_id}/members/{user_id}")
async def remove_team_member(chat_id: str, user_id: str):
    """
    Remove a user from a team chat.

    Args:
        chat_id: Chat ID.
        user_id: User ID.

    Returns:
        Removal status.
    """
    success = chat_service.remove_team_member(chat_id, user_id)
    if not success:
        raise HTTPException(status_code=400, detail="Failed to remove team member")

    return {"status": "success", "message": "Team member removed"}

@app.delete("/chats/{chat_id}")
async def delete_chat(chat_id: str):
    """
    Delete a chat.

    Args:
        chat_id: Chat ID.

    Returns:
        Deletion status.
    """
    success = chat_service.delete_chat(chat_id)
    if not success:
        raise HTTPException(status_code=404, detail="Chat not found")

    return {"status": "success", "message": "Chat deleted"}