#
# your_app/views.py (or wherever this file is located)
#
import datetime
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from typing import Tuple, Optional
import enum

# Assuming these are your project's modules
from .. import crud, models, schemas, database
from ..services import payment_service

# Placeholder for the Authorize.Net response object type
AuthNetResponse = object 


router = APIRouter(
    tags=["Transactions"], # Tags are for documentation only, they don't affect URLs
)

class TransactionStatus(enum.IntEnum):
    APPROVED = 0
    DECLINED = 1

class TransactionType(enum.IntEnum):
    CHARGE = 0
    AUTHORIZE = 1
    CAPTURE = 3

# --- Helper function to avoid repeating response parsing logic ---
def _parse_authnet_response(response: Optional[AuthNetResponse]) -> Tuple[TransactionStatus, Optional[str], Optional[str]]:
    """
    Parses the response from the Authorize.Net service.
    (This is the same helper from before, it's a good change to keep)
    """
    if response is not None and hasattr(response, 'messages') and response.messages.resultCode == "Ok":
        status = TransactionStatus.APPROVED
        auth_net_transaction_id = str(response.transactionResponse.transId) if hasattr(response, 'transactionResponse') else None
        rejection_reason = None
    else:
        status = TransactionStatus.DECLINED
        auth_net_transaction_id = None

        # Improved rejection reason extraction
        rejection_reason = "Payment declined by gateway."
        if hasattr(response, '_rejection_reason') and response._rejection_reason:
            rejection_reason = str(response._rejection_reason)
        elif response is not None:
            # Check transaction response for errors
            if hasattr(response, 'transactionResponse') and response.transactionResponse:
                tr = response.transactionResponse
                if hasattr(tr, 'errors') and tr.errors:
                    for error in tr.errors:
                        if hasattr(error, 'errorCode') and hasattr(error, 'errorText'):
                            error_code = error.errorCode.text if error.errorCode else "Unknown"
                            error_text = error.errorText.text if error.errorText else "No error details"
                            rejection_reason = f"{error_code}: {error_text}"
                            break
                elif hasattr(tr, 'messages') and tr.messages:
                    if len(tr.messages) > 0:
                        msg = tr.messages[0]
                        if hasattr(msg, 'code') and hasattr(msg, 'description'):
                            code = msg.code.text if msg.code else "Unknown"
                            desc = msg.description.text if msg.description else "No description"
                            rejection_reason = f"{code}: {desc}"
        elif response is None:
            rejection_reason = "No response received from payment gateway."

    return status, auth_net_transaction_id, rejection_reason


@router.post("/authorize/", response_model=schemas.Transaction)
def authorize_card(customer_id: int, transaction: schemas.TransactionAuthorize, db: Session = Depends(database.get_db)):
    auth_net_response = payment_service.authorize_credit_card(transaction)
    status, auth_net_transaction_id, rejection_reason = _parse_authnet_response(auth_net_response)
 
    transaction_data = schemas.TransactionBase(
        preauthorize_amount=transaction.preauthorize_amount,
        transaction_type=TransactionType.AUTHORIZE,
        service_id=transaction.service_id,        
        delivery_id=transaction.delivery_id,      
        card_id=transaction.card_id,              
        rejection_reason=rejection_reason
    )

    return crud.create_transaction(
        db=db,
        transaction=transaction_data,
        customer_id=customer_id,
        status=status,
        auth_net_transaction_id=auth_net_transaction_id
    )

@router.post("/charge/{customer_id}", response_model=schemas.Transaction)
def charge_card(customer_id: int, transaction: schemas.TransactionCreate, db: Session = Depends(database.get_db)):

    try:
        auth_net_response = payment_service.charge_credit_card(transaction)
        status, auth_net_transaction_id, rejection_reason = _parse_authnet_response(auth_net_response)

        transaction_data = schemas.TransactionBase(
            charge_amount=transaction.charge_amount,
            transaction_type=TransactionType.CHARGE,
            service_id=transaction.service_id,
            delivery_id=transaction.delivery_id,
            card_id=transaction.card_id,
            rejection_reason=rejection_reason
        )

        result = crud.create_transaction(
            db=db,
            transaction=transaction_data,
            customer_id=customer_id,
            status=status,
            auth_net_transaction_id=auth_net_transaction_id
        )
        return result
    except Exception as e:
        print(f"DEBUG: Exception in charge_card: {str(e)}")
        import traceback
        print(f"DEBUG: Traceback: {traceback.format_exc()}")
        raise


@router.post("/capture/", response_model=schemas.Transaction)
def capture_authorized_amount(transaction: schemas.TransactionCapture, db: Session = Depends(database.get_db)):
    auth_transaction = crud.get_transaction_by_auth_id(db, auth_net_transaction_id=transaction.auth_net_transaction_id)
    if not auth_transaction:
        raise HTTPException(status_code=404, detail="Authorization transaction not found")

    auth_net_response = payment_service.capture_authorized_transaction(transaction)
    status, _, rejection_reason = _parse_authnet_response(auth_net_response)

    return crud.update_transaction_for_capture(
        db=db,
        auth_net_transaction_id=transaction.auth_net_transaction_id,
        charge_amount=transaction.charge_amount,
        status=status,
        rejection_reason=rejection_reason
    )

@router.get("/transaction/delivery/{delivery_id}", response_model=schemas.Transaction)
def get_transaction_by_delivery(delivery_id: int, db: Session = Depends(database.get_db)):
    transaction = crud.get_transaction_by_delivery_id(db, delivery_id=delivery_id)
    if not transaction:
        raise HTTPException(status_code=404, detail="No pre-authorized transaction found for this delivery")
    return transaction