"""Main Text Generation Service for ALwrity Backend. This service provides the main LLM text generation functionality, migrated from the legacy lib/gpt_providers/text_generation/main_text_generation.py """ import os import json from typing import Optional, Dict, Any from datetime import datetime from loguru import logger from fastapi import HTTPException from ..onboarding.api_key_manager import APIKeyManager from .gemini_provider import gemini_text_response, gemini_structured_json_response from .huggingface_provider import huggingface_text_response, huggingface_structured_json_response def llm_text_gen(prompt: str, system_prompt: Optional[str] = None, json_struct: Optional[Dict[str, Any]] = None, user_id: str = None) -> str: """ Generate text using Language Model (LLM) based on the provided prompt. Args: prompt (str): The prompt to generate text from. system_prompt (str, optional): Custom system prompt to use instead of the default one. json_struct (dict, optional): JSON schema structure for structured responses. user_id (str): Clerk user ID for subscription checking (required). Returns: str: Generated text based on the prompt. Raises: RuntimeError: If subscription limits are exceeded or user_id is missing. """ try: logger.info("[llm_text_gen] Starting text generation") logger.debug(f"[llm_text_gen] Prompt length: {len(prompt)} characters") # Set default values for LLM parameters gpt_provider = "google" # Default to Google Gemini model = "gemini-2.0-flash-001" temperature = 0.7 max_tokens = 4000 top_p = 0.9 n = 1 fp = 16 frequency_penalty = 0.0 presence_penalty = 0.0 # Check for GPT_PROVIDER environment variable env_provider = os.getenv('GPT_PROVIDER', '').lower() if env_provider in ['gemini', 'google']: gpt_provider = "google" model = "gemini-2.0-flash-001" elif env_provider in ['hf_response_api', 'huggingface', 'hf']: gpt_provider = "huggingface" model = "openai/gpt-oss-120b:groq" # Default blog characteristics blog_tone = "Professional" blog_demographic = "Professional" blog_type = "Informational" blog_language = "English" blog_output_format = "markdown" blog_length = 2000 # Check which providers have API keys available using APIKeyManager api_key_manager = APIKeyManager() available_providers = [] if api_key_manager.get_api_key("gemini"): available_providers.append("google") if api_key_manager.get_api_key("hf_token"): available_providers.append("huggingface") # If no environment variable set, auto-detect based on available keys if not env_provider: # Prefer Google Gemini if available, otherwise use Hugging Face if "google" in available_providers: gpt_provider = "google" model = "gemini-2.0-flash-001" elif "huggingface" in available_providers: gpt_provider = "huggingface" model = "openai/gpt-oss-120b:groq" else: logger.error("[llm_text_gen] No API keys found for supported providers.") raise RuntimeError("No LLM API keys configured. Configure GEMINI_API_KEY or HF_TOKEN to enable AI responses.") else: # Environment variable was set, validate it's supported if gpt_provider not in available_providers: logger.warning(f"[llm_text_gen] Provider {gpt_provider} not available, falling back to available providers") if "google" in available_providers: gpt_provider = "google" model = "gemini-2.0-flash-001" elif "huggingface" in available_providers: gpt_provider = "huggingface" model = "openai/gpt-oss-120b:groq" else: raise RuntimeError("No supported providers available.") logger.debug(f"[llm_text_gen] Using provider: {gpt_provider}, model: {model}") # Map provider name to APIProvider enum (define at function scope for usage tracking) from models.subscription_models import APIProvider provider_enum = None # Store actual provider name for logging (e.g., "huggingface", "gemini") actual_provider_name = None if gpt_provider == "google": provider_enum = APIProvider.GEMINI actual_provider_name = "gemini" # Use "gemini" for consistency in logs elif gpt_provider == "huggingface": provider_enum = APIProvider.MISTRAL # HuggingFace maps to Mistral enum for usage tracking actual_provider_name = "huggingface" # Keep actual provider name for logs if not provider_enum: raise RuntimeError(f"Unknown provider {gpt_provider} for subscription checking") # SUBSCRIPTION CHECK - Required and strict enforcement if not user_id: raise RuntimeError("user_id is required for subscription checking. Please provide Clerk user ID.") try: from services.database import get_session_for_user from services.subscription import UsageTrackingService, PricingService from models.subscription_models import UsageSummary db = get_session_for_user(user_id) if not db: logger.error(f"[llm_text_gen] Could not get database session for user {user_id}") raise RuntimeError("Database connection failed") try: usage_service = UsageTrackingService(db) pricing_service = PricingService(db) # Estimate tokens from prompt (input tokens) # CRITICAL: Use worst-case scenario (input + max_tokens) for validation to prevent abuse # This ensures we block requests that would exceed limits even if response is longer than expected input_tokens = int(len(prompt.split()) * 1.3) # Worst-case estimate: assume maximum possible output tokens (max_tokens if specified) # This prevents abuse where actual response tokens exceed the estimate if max_tokens: estimated_output_tokens = max_tokens # Use maximum allowed output tokens else: # If max_tokens not specified, use conservative estimate (input * 1.5) estimated_output_tokens = int(input_tokens * 1.5) estimated_total_tokens = input_tokens + estimated_output_tokens # Check limits using sync method from pricing service (strict enforcement) can_proceed, message, usage_info = pricing_service.check_usage_limits( user_id=user_id, provider=provider_enum, tokens_requested=estimated_total_tokens, actual_provider_name=actual_provider_name # Pass actual provider name for correct error messages ) if not can_proceed: logger.warning(f"[llm_text_gen] Subscription limit exceeded for user {user_id}: {message}") # Raise HTTPException(429) with usage info so frontend can display subscription modal error_detail = { 'error': message, 'message': message, 'provider': actual_provider_name or provider_enum.value, 'usage_info': usage_info if usage_info else {} } raise HTTPException(status_code=429, detail=error_detail) # Get current usage for limit checking only current_period = pricing_service.get_current_billing_period(user_id) or datetime.now().strftime("%Y-%m") usage = db.query(UsageSummary).filter( UsageSummary.user_id == user_id, UsageSummary.billing_period == current_period ).first() # No separate log here - we'll create unified log after API call and usage tracking finally: db.close() except HTTPException: # Re-raise HTTPExceptions (e.g., 429 subscription limit) - preserve error details raise except RuntimeError: # Re-raise subscription limit errors raise except Exception as sub_error: # STRICT: Fail on subscription check errors logger.error(f"[llm_text_gen] Subscription check failed for user {user_id}: {sub_error}") raise RuntimeError(f"Subscription check failed: {str(sub_error)}") # Construct the system prompt if not provided if system_prompt is None: system_instructions = f"""You are a highly skilled content writer with a knack for creating engaging and informative content. Your expertise spans various writing styles and formats. Writing Style Guidelines: - Tone: {blog_tone} - Target Audience: {blog_demographic} - Content Type: {blog_type} - Language: {blog_language} - Output Format: {blog_output_format} - Target Length: {blog_length} words Please provide responses that are: - Well-structured and easy to read - Engaging and informative - Tailored to the specified tone and audience - Professional yet accessible - Optimized for the target content type """ else: system_instructions = system_prompt # Generate response based on provider response_text = None actual_provider_used = gpt_provider try: if gpt_provider == "google": if json_struct: response_text = gemini_structured_json_response( prompt=prompt, schema=json_struct, temperature=temperature, top_p=top_p, top_k=n, max_tokens=max_tokens, system_prompt=system_instructions ) else: response_text = gemini_text_response( prompt=prompt, temperature=temperature, top_p=top_p, n=n, max_tokens=max_tokens, system_prompt=system_instructions ) elif gpt_provider == "huggingface": if json_struct: response_text = huggingface_structured_json_response( prompt=prompt, schema=json_struct, model=model, temperature=temperature, max_tokens=max_tokens, system_prompt=system_instructions ) else: response_text = huggingface_text_response( prompt=prompt, model=model, temperature=temperature, max_tokens=max_tokens, top_p=top_p, system_prompt=system_instructions ) else: logger.error(f"[llm_text_gen] Unknown provider: {gpt_provider}") raise RuntimeError("Unknown LLM provider. Supported providers: google, huggingface") # TRACK USAGE after successful API call if response_text: logger.info(f"[llm_text_gen] ✅ API call successful, tracking usage for user {user_id}, provider {provider_enum.value}") try: from services.intelligence.agents.agent_usage_tracking import track_agent_usage_sync # Estimate tokens tokens_input = int(len(prompt.split()) * 1.3) # Calculate duration (mocking it since we didn't track start time explicitly in this function) # Ideally we should track start_time at beginning of function duration = 0.5 track_agent_usage_sync( user_id=user_id, model_name=model, prompt=prompt, response_text=response_text, duration=duration ) except Exception as usage_error: # Non-blocking: log error but don't fail the request logger.error(f"[llm_text_gen] ❌ Failed to track usage: {usage_error}", exc_info=True) return response_text except Exception as provider_error: logger.error(f"[llm_text_gen] Provider {gpt_provider} failed: {str(provider_error)}") # CIRCUIT BREAKER: Only try ONE fallback to prevent expensive API calls fallback_providers = ["google", "huggingface"] fallback_providers = [p for p in fallback_providers if p in available_providers and p != gpt_provider] if fallback_providers: fallback_provider = fallback_providers[0] # Only try the first available try: logger.info(f"[llm_text_gen] Trying SINGLE fallback provider: {fallback_provider}") actual_provider_used = fallback_provider # Update provider enum for fallback if fallback_provider == "google": provider_enum = APIProvider.GEMINI actual_provider_name = "gemini" fallback_model = "gemini-2.0-flash-lite" elif fallback_provider == "huggingface": provider_enum = APIProvider.MISTRAL actual_provider_name = "huggingface" fallback_model = "openai/gpt-oss-120b:groq" if fallback_provider == "google": if json_struct: response_text = gemini_structured_json_response( prompt=prompt, schema=json_struct, temperature=temperature, top_p=top_p, top_k=n, max_tokens=max_tokens, system_prompt=system_instructions ) else: response_text = gemini_text_response( prompt=prompt, temperature=temperature, top_p=top_p, n=n, max_tokens=max_tokens, system_prompt=system_instructions ) elif fallback_provider == "huggingface": if json_struct: response_text = huggingface_structured_json_response( prompt=prompt, schema=json_struct, model="openai/gpt-oss-120b:groq", temperature=temperature, max_tokens=max_tokens, system_prompt=system_instructions ) else: response_text = huggingface_text_response( prompt=prompt, model="openai/gpt-oss-120b:groq", temperature=temperature, max_tokens=max_tokens, top_p=top_p, system_prompt=system_instructions ) # TRACK USAGE after successful fallback call if response_text: logger.info(f"[llm_text_gen] ✅ Fallback API call successful, tracking usage for user {user_id}, provider {provider_enum.value}") try: from services.intelligence.agents.agent_usage_tracking import track_agent_usage_sync # Estimate tokens tokens_input = int(len(prompt.split()) * 1.3) track_agent_usage_sync( user_id=user_id, model_name=fallback_model, prompt=prompt, response_text=response_text, duration=0.5 # Approximate duration ) except Exception as usage_error: logger.error(f"[llm_text_gen] ❌ Failed to track fallback usage: {usage_error}", exc_info=True) return response_text except Exception as fallback_error: logger.error(f"[llm_text_gen] Fallback provider {fallback_provider} also failed: {str(fallback_error)}") # CIRCUIT BREAKER: Stop immediately to prevent expensive API calls logger.error("[llm_text_gen] CIRCUIT BREAKER: Stopping to prevent expensive API calls.") raise RuntimeError("All LLM providers failed to generate a response.") except Exception as e: logger.error(f"[llm_text_gen] Error during text generation: {str(e)}") raise def check_gpt_provider(gpt_provider: str) -> bool: """Check if the specified GPT provider is supported.""" supported_providers = ["google", "huggingface"] return gpt_provider in supported_providers def get_api_key(gpt_provider: str) -> Optional[str]: """Get API key for the specified provider.""" try: api_key_manager = APIKeyManager() provider_mapping = { "google": "gemini", "huggingface": "hf_token" } mapped_provider = provider_mapping.get(gpt_provider, gpt_provider) return api_key_manager.get_api_key(mapped_provider) except Exception as e: logger.error(f"[get_api_key] Error getting API key for {gpt_provider}: {str(e)}") return None