from fastapi import APIRouter, Depends, HTTPException, Header, status
from sqlalchemy.orm import Session
from app.core.database import get_db
from app.models.schemas import InputSchema, PredictionOutput
from app.models.models import PredictionLog
from app.services.ml_service import ml_service
from app.core.config import settings

router = APIRouter()

def verify_api_key(x_api_key: str = Header(...)):
    if x_api_key != settings.API_KEY:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid API Key",
        )
    return x_api_key

@router.post("/predict", response_model=PredictionOutput)
def predict(input_data: InputSchema, db: Session = Depends(get_db), api_key: str = Depends(verify_api_key)):
    # Convert Pydantic model to dict
    data_dict = input_data.dict()
    
    try:
        # Make prediction
        prediction, probability = ml_service.predict(data_dict)
        
        # Log to Database
        db_log = PredictionLog(
            **data_dict,
            prediction=prediction,
            probability=probability
        )
        db.add(db_log)
        db.commit()
        db.refresh(db_log)
        
        return PredictionOutput(prediction=prediction, probability=probability)
        
    except Exception as e:
        print(f"Error during prediction: {e}")
        raise HTTPException(status_code=500, detail=str(e))

@router.get("/health")
def health_check():
    return {"status": "healthy"}

@router.get("/model/info")
def model_info(api_key: str = Depends(verify_api_key)):
    model = ml_service.model
    if not model:
        return {"status": "Model not loaded"}
    return {
        "type": str(type(model)),
        "params": model.get_params() if hasattr(model, "get_params") else "Unknown"
    }