from typing import List
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from backend.app.core.database import get_db
from backend.app.routers.auth import get_current_user
from backend.app.repositories.wallet import WalletRepository
from backend.app.schemas.wallet import WalletTopup, WalletTransactionResponse
from backend.app.models.users import User

router = APIRouter(prefix="/wallet", tags=["wallet"])

@router.post("/topup")
def topup_wallet(
    data: WalletTopup, 
    current_user: User = Depends(get_current_user), 
    db: Session = Depends(get_db)
):
    """
    Simulate a UPI/Razorpay wallet top-up, crediting the customer's balance.
    """
    wallet_repo = WalletRepository(db)
    
    # Increase wallet balance
    new_balance = wallet_repo.update_balance(current_user.id, data.amount)
    
    # Record transaction ledger log
    wallet_repo.add_transaction(
        user_id=current_user.id,
        label="Wallet top-up via UPI",
        amount=data.amount,
        type_="credit"
    )
    
    return {
        "message": f"Successfully recharged wallet by {data.amount} INR.",
        "wallet_balance": new_balance
    }

@router.get("/transactions", response_model=List[WalletTransactionResponse])
def get_transactions(
    current_user: User = Depends(get_current_user), 
    db: Session = Depends(get_db)
):
    """
    Retrieve the immutable ledger history for the current user.
    """
    wallet_repo = WalletRepository(db)
    return wallet_repo.get_user_transactions(current_user.id)

@router.get("/balance")
def get_balance(
    current_user: User = Depends(get_current_user), 
    db: Session = Depends(get_db)
):
    """
    Retrieve the current wallet balance of the authenticated user.
    """
    wallet_repo = WalletRepository(db)
    
    if current_user.role == "customer":
        profile = wallet_repo.get_customer_profile(current_user.id)
        balance = profile.wallet_balance if profile else 8200
    elif current_user.role == "worker":
        # Workers can have earnings in their profile wallet balance for viva demo convenience
        profile = wallet_repo.get_customer_profile(current_user.id)
        balance = profile.wallet_balance if profile else 0
    else:
        balance = 0
        
    return {"wallet_balance": balance}