from fastapi import FastAPI, UploadFile, File
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

# Import both services
try:
    from split import (
        app as ingestion_app,
        ingest_pdf,
        get_stats as get_ingestion_stats
    )
    print("✅ Loaded ingestion service (split.py)")
except Exception as e:
    print(f"⚠️ Warning: Could not load ingestion service: {e}")
    ingestion_app = None

try:
    from query_service import (
        app as query_app,
        query_rag,
        query_with_details,
        get_stats as get_query_stats
    )
    print("✅ Loaded query service (query_service.py)")
except Exception as e:
    print(f"⚠️ Warning: Could not load query service: {e}")
    query_app = None


# Create main application
app = FastAPI(
    title="🚀 Multimodal RAG - Combined Service",
    description="Unified service for PDF ingestion and multimodal querying",
    version="1.0.0",
    docs_url="/docs",
    redoc_url="/redoc"
)

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


# ==================== HOME & HEALTH ENDPOINTS ====================

@app.get("/")
async def home():
    """Main endpoint with service information"""
    return {
        "message": "✅ Multimodal RAG Service is running",
        "status": "healthy",
        "services": {
            "ingestion": "available" if ingestion_app else "unavailable",
            "query": "available" if query_app else "unavailable"
        },
        "endpoints": {
            "ingestion": {
                "ingest_pdf": "POST /ingest",
                "ingestion_stats": "GET /ingest/stats"
            },
            "query": {
                "query": "POST /query?question=YOUR_QUESTION&k=5",
                "query_detailed": "POST /query/details?question=YOUR_QUESTION&k=5",
                "query_stats": "GET /query/stats"
            },
            "documentation": {
                "swagger": "/docs",
                "redoc": "/redoc"
            }
        },
        "features": [
            "PDF text extraction",
            "Table extraction", 
            "Image extraction",
            "Multimodal summarization",
            "Vector similarity search",
            "Context-aware answering"
        ]
    }


@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {
        "status": "healthy",
        "services": {
            "ingestion": ingestion_app is not None,
            "query": query_app is not None
        }
    }


# ==================== INGESTION ENDPOINTS ====================

@app.post("/ingest")
async def ingest_document(file: UploadFile = File(...)):
    """
    Upload and ingest a PDF document
    
    This endpoint processes PDFs and extracts:
    - Text content
    - Tables
    - Images
    
    All content is summarized and stored in the vectorstore.
    """
    if ingestion_app is None:
        return JSONResponse(
            status_code=503,
            content={"error": "Ingestion service not available"}
        )
    
    return await ingest_pdf(file)


@app.get("/ingest/stats")
async def ingestion_stats():
    """Get ingestion service statistics"""
    if ingestion_app is None:
        return JSONResponse(
            status_code=503,
            content={"error": "Ingestion service not available"}
        )
    
    return get_ingestion_stats()


# ==================== QUERY ENDPOINTS ====================

@app.post("/query")
async def query_documents(question: str, k: int = 5):
    """
    Query the RAG system
    
    Args:
        question: The question to ask
        k: Number of documents to retrieve (default: 5)
    
    Returns:
        Answer based on retrieved documents
    """
    if query_app is None:
        return JSONResponse(
            status_code=503,
            content={"error": "Query service not available"}
        )
    
    return await query_rag(question, k)


@app.post("/query/details")
async def query_documents_detailed(question: str, k: int = 5):
    """
    Query with detailed document information
    
    Args:
        question: The question to ask
        k: Number of documents to retrieve (default: 5)
    
    Returns:
        Answer with detailed information about retrieved documents
    """
    if query_app is None:
        return JSONResponse(
            status_code=503,
            content={"error": "Query service not available"}
        )
    
    return await query_with_details(question, k)


@app.get("/query/stats")
async def query_stats():
    """Get query service statistics"""
    if query_app is None:
        return JSONResponse(
            status_code=503,
            content={"error": "Query service not available"}
        )
    
    return get_query_stats()


# ==================== COMBINED STATS ENDPOINT ====================

@app.get("/stats")
async def combined_stats():
    """Get combined statistics from both services"""
    stats = {
        "service": "combined",
        "status": "healthy"
    }
    
    try:
        if query_app:
            query_stats_data = get_query_stats()
            stats["vectorstore"] = query_stats_data
    except Exception as e:
        stats["vectorstore_error"] = str(e)
    
    return stats




@app.on_event("startup")
async def startup_event():
    """Run on application startup"""
    print("\n" + "="*50)
    print("🚀 Multimodal RAG Service Starting...")
    print("="*50)
    
    if ingestion_app:
        print("✅ Ingestion service: READY")
    else:
        print("⚠️  Ingestion service: NOT LOADED")
    
    if query_app:
        print("✅ Query service: READY")
    else:
        print("⚠️  Query service: NOT LOADED")
    
    print("="*50)
    print("📡 Service available at: http://0.0.0.0:7860")
    print("📚 API Documentation: http://0.0.0.0:7860/docs")
    print("="*50 + "\n")


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)