"""
Hugging Face Spaces Entry Point for CSRC Car Manual RAG System
This is the entry point for Hugging Face Spaces deployment
Note: For local development, use main.py instead.
"""
import os
import sys
from pathlib import Path

# Detect if running in Hugging Face Spaces
IS_SPACES = os.getenv("SPACE_ID") is not None or os.getenv("HF_SPACE") is not None

# Add the current directory to Python path for Spaces environment
sys.path.insert(0, str(Path(__file__).parent))

from openai import OpenAI
from src.config import Config
from src.vector_store import VectorStoreManager
from src.rag_query import RAGQueryEngine
from src.question_generator import QuestionGenerator
from src.knowledge_graph import KnowledgeGraphGenerator
from src.gradio_interface import GradioInterfaceBuilder

# Import personalized learning if available
try:
    from modules.personalized_learning import UserProfilingSystem, LearningPathGenerator, AdaptiveLearningEngine
    PERSONALIZED_LEARNING_AVAILABLE = True
except ImportError:
    PERSONALIZED_LEARNING_AVAILABLE = False
    print("⚠️ Personalized learning modules not available")

# Import proactive learning if available
try:
    from modules.proactive_learning import ProactiveLearningEngine
    PROACTIVE_LEARNING_AVAILABLE = True
except ImportError:
    PROACTIVE_LEARNING_AVAILABLE = False
    print("⚠️ Proactive learning modules not available")

# Import scenario contextualization if available
try:
    from modules.scenario_contextualization.database.scenario_database import ScenarioDatabase
    from modules.scenario_contextualization.integration.feature_extractor import ADASFeatureExtractor
    from modules.scenario_contextualization.retrieval.scenario_retriever import ScenarioRetriever
    from modules.scenario_contextualization.formatting.constructive_formatter import ConstructiveFormatter
    from modules.scenario_contextualization.integration.enhanced_rag_engine import EnhancedRAGEngine
    SCENARIO_CONTEXTUALIZATION_AVAILABLE = True
except ImportError as e:
    SCENARIO_CONTEXTUALIZATION_AVAILABLE = False
    print(f"⚠️ Scenario contextualization modules not available: {e}")


def initialize_system(config: Config) -> dict:
    """Initialize the RAG system components"""
    # Initialize OpenAI client
    if not config.openai_api_key:
        raise ValueError(
            "OPENAI_API_KEY not found! Please set it in Hugging Face Spaces Secrets. "
            "Go to Settings > Secrets and add OPENAI_API_KEY"
        )
    
    client = OpenAI(api_key=config.openai_api_key)
    
    # Initialize vector store manager
    vector_store_manager = VectorStoreManager(client)
    
    # Get or create vector store
    vector_store_id = config.get_vector_store_id()
    
    if not vector_store_id:
        print("📦 Creating new vector store...")
        pdf_files = config.get_pdf_files()
        
        if not pdf_files:
            raise ValueError(f"No PDF files found in {config.car_manual_dir}")
        
        vector_store_details = vector_store_manager.create_vector_store(config.vector_store_name)
        if not vector_store_details:
            raise RuntimeError("Failed to create vector store")
        
        vector_store_id = vector_store_details["id"]
        config.save_vector_store_id(vector_store_id, config.vector_store_name)
        
        # Upload files
        upload_stats = vector_store_manager.upload_pdf_files(pdf_files, vector_store_id)
        if upload_stats["successful_uploads"] == 0:
            raise RuntimeError("Failed to upload any files")
    else:
        print(f"✅ Using existing vector store: {vector_store_id}")
    
    # Initialize RAG query engine
    rag_engine = RAGQueryEngine(client, vector_store_id, config.model)
    
    # Initialize question generator
    question_generator = QuestionGenerator(client, rag_engine)
    
    # Initialize knowledge graph generator
    knowledge_graph = KnowledgeGraphGenerator(client, vector_store_id, str(config.output_dir))
    
    # Initialize personalized learning (if available)
    user_profiling = None
    learning_path_generator = None
    adaptive_engine = None
    
    if PERSONALIZED_LEARNING_AVAILABLE:
        try:
            user_profiling = UserProfilingSystem()
            learning_path_generator = LearningPathGenerator(user_profiling, config.available_topics)
            adaptive_engine = AdaptiveLearningEngine(user_profiling, learning_path_generator)
            print("✅ Personalized Learning System initialized!")
        except Exception as e:
            print(f"⚠️ Error initializing Personalized Learning System: {e}")
    
    # Initialize proactive learning (if available)
    proactive_engine = None
    if PROACTIVE_LEARNING_AVAILABLE and user_profiling:
        try:
            proactive_engine = ProactiveLearningEngine(
                client, rag_engine, user_profiling, adaptive_engine, config.available_topics
            )
            print("✅ Proactive Learning Assistance initialized!")
        except Exception as e:
            print(f"⚠️ Error initializing Proactive Learning Assistance: {e}")
    
    # Initialize scenario contextualization (if available)
    enhanced_rag_engine = None
    if SCENARIO_CONTEXTUALIZATION_AVAILABLE:
        try:
            scenario_database = ScenarioDatabase()
            feature_extractor = ADASFeatureExtractor(use_llm=False, client=client)
            scenario_retriever = ScenarioRetriever(
                scenario_database=scenario_database,
                scenario_vector_store_id=None,
                client=client
            )
            formatter = ConstructiveFormatter()
            enhanced_rag_engine = EnhancedRAGEngine(
                base_rag_engine=rag_engine,
                scenario_retriever=scenario_retriever,
                feature_extractor=feature_extractor,
                formatter=formatter
            )
            print("✅ Scenario Contextualization initialized!")
        except Exception as e:
            print(f"⚠️ Error initializing Scenario Contextualization: {e}")
            import traceback
            traceback.print_exc()
    
    return {
        "client": client,
        "vector_store_manager": vector_store_manager,
        "rag_engine": rag_engine,
        "question_generator": question_generator,
        "knowledge_graph": knowledge_graph,
        "user_profiling": user_profiling,
        "learning_path_generator": learning_path_generator,
        "adaptive_engine": adaptive_engine,
        "proactive_engine": proactive_engine,
        "enhanced_rag_engine": enhanced_rag_engine,
        "config": config
    }


def create_app():
    """Create and return the Gradio app for Hugging Face Spaces"""
    print("=" * 60)
    print("🚗 CSRC Car Manual RAG System - Hugging Face Spaces")
    print("=" * 60)
    
    # Load configuration
    config = Config()
    
    # Initialize system
    try:
        components = initialize_system(config)
    except Exception as e:
        print(f"❌ Error initializing system: {e}")
        import gradio as gr
        
        # Create error interface
        error_msg = f"""
        # ❌ Initialization Error
        
        **Error:** {str(e)}
        
        **Possible solutions:**
        1. Check if OPENAI_API_KEY is set in Spaces Secrets (Settings > Secrets)
        2. Ensure PDF files are in the `car_manual/` directory
        3. Check the logs for more details
        """
        
        def error_display():
            return error_msg
        
        error_interface = gr.Interface(
            fn=error_display,
            inputs=None,
            outputs=gr.Markdown(),
            title="CSRC Car Manual RAG System",
            description="An error occurred during initialization. Please check the logs."
        )
        return error_interface
    
    # Build Gradio interface
    print("\n🌐 Building Gradio interface...")
    try:
        interface_builder = GradioInterfaceBuilder(
            rag_engine=components["rag_engine"],
            question_generator=components["question_generator"],
            knowledge_graph=components["knowledge_graph"],
            config=components["config"],
            user_profiling=components["user_profiling"],
            adaptive_engine=components["adaptive_engine"],
            proactive_engine=components["proactive_engine"]
        )
        
        # Create interface
        print("Creating Gradio Blocks...")
        demo = interface_builder.create_interface()
        print("✅ Gradio interface created successfully!")
        
        return demo
    except Exception as e:
        print(f"❌ Error building Gradio interface: {e}")
        import traceback
        traceback.print_exc()
        # Return a simple error interface
        import gradio as gr
        error_demo = gr.Interface(
            fn=lambda: f"Error building interface: {str(e)}",
            inputs=None,
            outputs="text",
            title="CSRC Car Manual RAG System - Interface Error"
        )
        return error_demo


# Create the app for Hugging Face Spaces
# Spaces will automatically detect Gradio and run this
# The demo variable must be exposed at module level for Spaces to detect it

# Initialize demo to None first
demo = None

# Only initialize once (prevent duplicate initialization)
if demo is None:
    try:
        print("🔄 Starting app initialization...")
        demo = create_app()
        print("✅ App created successfully!")
        print(f"✅ Demo type: {type(demo)}")
        print(f"✅ Demo object: {demo}")
        
        # Verify demo is a valid Gradio Blocks object
        if demo is None:
            raise ValueError("Demo object is None after creation")
        if not hasattr(demo, 'launch'):
            raise ValueError("Demo object does not have launch method")
            
    except Exception as e:
        print(f"❌ Fatal error creating app: {e}")
        import traceback
        traceback.print_exc()
        
        # Create a minimal error interface
        import gradio as gr
        
        def show_error():
            return f"""
            # ❌ Application Error
            
            **Fatal Error:** {str(e)}
            
            Please check:
            1. OPENAI_API_KEY is set in Spaces Secrets
            2. All required files are uploaded
            3. Check the logs for detailed error information
            
            **Traceback:**
            ```
            {traceback.format_exc()}
            ```
            """
        
        demo = gr.Interface(
            fn=show_error,
            inputs=None,
            outputs=gr.Markdown(),
            title="CSRC Car Manual RAG System - Error",
            description="An error occurred. Please check the logs."
        )

# Final verification
if demo is None:
    import gradio as gr
    demo = gr.Interface(
        fn=lambda: "Application failed to initialize. Please check the logs.",
        inputs=None,
        outputs="text",
        title="CSRC Car Manual RAG System - Initialization Failed"
    )

# Note: Do NOT call demo.launch() here
# Hugging Face Spaces will automatically detect and launch the demo
# The demo variable is exposed at module level, which is what Spaces expects