from fastapi import APIRouter, HTTPException, UploadFile, File
from models.request_models import ProviderNotesRequest, FileUploadResponse
from models.response_models import CodingResponse
from services.groq_service import groq_service
from services.file_service import file_service
import logging

router = APIRouter()
logger = logging.getLogger(__name__)


# EXISTING ENDPOINT - DO NOT CHANGE
@router.post("/coding", response_model=CodingResponse)
async def analyze_provider_notes(request: ProviderNotesRequest):
    """
    Analyze provider notes and extract ICD-10 and CPT codes
    
    This endpoint accepts provider notes as text input.
    """
    try:
        logger.info("Received coding request")
        
        # Get provider notes from request
        provider_notes = request.provider_notes
        
        if not provider_notes or len(provider_notes.strip()) < 10:
            raise HTTPException(
                status_code=400,
                detail="Provider notes must be at least 10 characters long"
            )
        
        # Process through Groq service
        result = await groq_service.analyze_provider_notes(provider_notes)
        
        logger.info("Successfully processed coding request")
        
        # Return response matching CodingResponse model
        return CodingResponse(
            cpt_codes=result.get("CPT", []),
            cpt_explanation=result.get("CPT_explanation", ""),
            icd_codes=result.get("ICD", []),
            icd_explanation=result.get("ICD_explanation", "")
        )
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error in analyze_provider_notes: {str(e)}")
        raise HTTPException(
            status_code=500,
            detail=f"Error processing request: {str(e)}"
        )


# UPDATED ENDPOINT - File Upload with PII Removal
@router.post("/upload-file", response_model=FileUploadResponse)
async def upload_provider_notes_file(file: UploadFile = File(...)):
    """
    Upload a TXT file containing provider notes and extract ICD-10 and CPT codes
    
    This endpoint:
    1. Extracts text from uploaded TXT file
    2. Automatically detects and removes patient personal information (PII)
    3. Processes sanitized text through LLM
    4. Returns ICD-10 and CPT codes
    
    Args:
        file: TXT file containing provider notes
        
    Returns:
        FileUploadResponse with codes, explanations, and PII removal info
    """
    try:
        logger.info(f"📁 Received file upload request: {file.filename}")
        
        # Step 1: Extract text from file with automatic PII removal
        extraction_result = await file_service.extract_text_from_file(
            file=file,
            remove_pii=True  # Always remove PII for safety
        )
        
        extracted_text = extraction_result["text"]
        filename = extraction_result["filename"]
        text_length = extraction_result["text_length"]
        pii_info = extraction_result["pii_info"]
        
        logger.info(f"✅ Extracted {text_length} characters from {filename}")
        
        if pii_info["pii_removed"]:
            logger.info(f"🔒 Removed {pii_info['pii_count']} PII entities before processing")
        
        # Step 2: Process sanitized text through Groq LLM
        coding_result = await groq_service.analyze_provider_notes(extracted_text)
        
        logger.info(f"✅ Successfully processed file: {filename}")
        
        # Step 3: Return combined response with PII info
        return FileUploadResponse(
            success=True,
            filename=filename,
            extracted_text_length=text_length,
            pii_removed=pii_info["pii_removed"],
            pii_count=pii_info["pii_count"],
            cpt_codes=coding_result.get("CPT", []),
            cpt_explanation=coding_result.get("CPT_explanation", ""),
            icd_codes=coding_result.get("ICD", []),
            icd_explanation=coding_result.get("ICD_explanation", "")
        )
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"❌ Error in upload_provider_notes_file: {str(e)}")
        raise HTTPException(
            status_code=500,
            detail=f"Error processing uploaded file: {str(e)}"
        )