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

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


@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 and returns:
    - ICD-10 diagnostic codes with explanations
    - CPT procedure codes with explanations
    - Overall encounter summary
    """
    try:
        logger.info(f"📥 Received coding request (notes length: {len(request.provider_notes)})")
        
        # Validate input
        if not request.provider_notes or len(request.provider_notes.strip()) < 10:
            raise HTTPException(
                status_code=400,
                detail="Provider notes must be at least 10 characters long"
            )
        
        # Analyze with Groq
        result = groq_service.analyze_provider_notes(request.provider_notes)
        
        logger.info(f"✅ Analysis complete: {len(result.get('icd_codes', []))} ICD codes, {len(result.get('cpt_codes', []))} CPT codes")
        
        return result
        
    except HTTPException:
        raise
    except ValueError as e:
        logger.error(f"❌ Validation error: {str(e)}")
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        logger.error(f"❌ Error processing request: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Error processing request: {str(e)}")


@router.post("/upload-file", response_model=FileUploadResponse)
async def upload_provider_notes_file(file: UploadFile = File(...)):
    """
    Upload a provider notes file (.txt), remove PII, and analyze
    
    Returns:
    - File processing info (PII removal stats)
    - ICD-10 codes with explanations
    - CPT codes with explanations
    - Overall summary
    """
    try:
        logger.info(f"📤 Received file upload: {file.filename}")
        
        # Validate file type
        if not file.filename.endswith('.txt'):
            raise HTTPException(
                status_code=400,
                detail="Only .txt files are allowed"
            )
        
        # Read file content
        content = await file.read()
        text = content.decode('utf-8')
        
        logger.info(f"📄 File read successfully (length: {len(text)})")
        
        # Remove PII
        try:
            cleaned_text, pii_count = file_service.remove_pii(text)
            logger.info(f"🔒 PII removal complete: {pii_count} entities removed")
        except Exception as pii_error:
            logger.error(f"⚠️ PII removal failed: {str(pii_error)}")
            # Continue without PII removal if it fails
            cleaned_text = text
            pii_count = 0
        
        # Analyze with Groq
        result = groq_service.analyze_provider_notes(cleaned_text)
        
        # Combine results
        response = {
            "success": True,
            "filename": file.filename,
            "extracted_text_length": len(text),
            "pii_removed": pii_count > 0,
            "pii_count": pii_count,
            "icd_codes": result.get("icd_codes", []),
            "cpt_codes": result.get("cpt_codes", []),
            "overall_summary": result.get("overall_summary", "")
        }
        
        logger.info(f"✅ File processing complete")
        
        return response
        
    except HTTPException:
        raise
    except UnicodeDecodeError:
        logger.error("❌ File encoding error")
        raise HTTPException(status_code=400, detail="File must be UTF-8 encoded text")
    except Exception as e:
        logger.error(f"❌ Error processing uploaded file: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Error processing uploaded file: {str(e)}")