from fastapi import APIRouter, HTTPException, status, Query, Depends
from typing import List
from datetime import datetime
from .Model import Payment
from App.Users.Model import User
from App.Plans.Model import Plan
from .Schema import (
    CreatePaymentRequest,
    UpdatePaymentStatusRequest,
    PaymentResponse,
    UpdatePaymentUserRequest,
    BaseResponse,
    PaymentListResponse,
)
from .Schema import PaymentMethod
from App.Users.dependencies import (
    get_current_active_user,
    UserType,
)  # Assuming you have a dependency to get the current user


payment_router = APIRouter(tags=["Payments"])


@payment_router.post("/payment/create", response_model=BaseResponse)
async def create_payment(request: CreatePaymentRequest, internal: bool = False):
    # If payment method is "Lipa Number", transaction_id is required
    if (
        request.payment_method == PaymentMethod.LIPA_NUMBER
        and not request.transaction_id
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Transaction ID is required for Lipa Number payments",
        )

    # Check if plan exists
    plan = await Plan.get_or_none(id=request.plan_id)
    if request.plan_id and not plan:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Plan not found"
        )

    payment = await Payment.get_or_none(transaction_id=request.transaction_id)

    if payment:
        return BaseResponse(
            code=404,
            message="Payment already exists",
            payload={"payment_id": str(payment.id)},
        )
    # Create new payment without linking a user initially
    payment = await Payment.create(
        user_id=request.user_id,
        plan=plan,
        amount=request.amount,
        payment_method=request.payment_method,
        transaction_id=request.transaction_id,
        status="pending",  # Default status
    )

    if internal:
        return payment

    # If payment method is "cash", attempt to create a subscription
    if payment.payment_method == PaymentMethod.CASH:
        await payment.create_subscription_if_cash()

    await payment.save()

    return BaseResponse(
        code=200,
        message="Payment created successfully",
        payload={"payment_id": str(payment.id)},
    )


@payment_router.get("/payment/{payment_id}", response_model=PaymentResponse)
async def get_payment(payment_id: str):
    payment = await Payment.get_or_none(id=payment_id)
    if not payment:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Payment not found"
        )

    return PaymentResponse(
        id=str(payment.id),
        user_id=payment.user_id,
        plan_id=payment.plan_id,
        amount=payment.amount,
        payment_method=payment.payment_method,
        status=payment.status,
        transaction_id=payment.transaction_id,
        created_time=payment.created_time,
        updated_time=payment.updated_time,
    )


@payment_router.get("/payments/unlinked", response_model=PaymentListResponse)
async def get_unlinked_payments():
    unlinked_payments = await Payment.filter(user_id=None)
    result = [
        PaymentResponse(
            id=str(payment.id),
            user_id=payment.user_id,
            plan_id=payment.plan_id,
            amount=payment.amount,
            payment_method=payment.payment_method,
            status=payment.status,
            transaction_id=payment.transaction_id,
            created_time=payment.created_time,
            updated_time=payment.updated_time,
        )
        for payment in unlinked_payments
    ]

    return PaymentListResponse(payments=result, total_count=len(result))


@payment_router.put("/payment/{payment_id}/link-user", response_model=BaseResponse)
async def link_user_to_payment(payment_id: str, request: UpdatePaymentUserRequest):
    payment = await Payment.get_or_none(id=payment_id)
    if not payment:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="Payment not found"
        )

    user = await User.get_or_none(id=request.user_id)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="User not found"
        )

    # Link payment to the user
    payment.user_id = request.user_id
    await payment.save()

    # If the payment method is "Lipa Number" or "M-Pesa", add to user's balance directly
    if (
        payment.payment_method in [PaymentMethod.LIPA_NUMBER, PaymentMethod.MPESA]
        and not payment.plan
    ):
        user.balance += payment.amount
        await user.save()

        # Update payment status to indicate it was assigned to balance
        payment.status = "balance-assigned"
        await payment.save()

        return BaseResponse(
            code=200,
            message="Payment linked to user and amount added to balance successfully",
            payload={
                "payment_id": str(payment.id),
                "user_id": request.user_id,
                "new_balance": user.balance,
            },
        )

    return BaseResponse(
        code=200,
        message="Payment linked to user successfully",
        payload={"payment_id": str(payment.id), "user_id": request.user_id},
    )


@payment_router.get("/payments/date-range", response_model=PaymentListResponse)
async def get_payments_by_date_range(
    start_date: datetime = Query(..., description="Start date in ISO format"),
    end_date: datetime = Query(..., description="End date in ISO format"),
):
    if start_date > end_date:
        raise HTTPException(
            status_code=400, detail="Start date must be less than or equal to end date"
        )

    payments = await Payment.filter(created_time__range=(start_date, end_date))

    result = [
        PaymentResponse(
            id=str(payment.id),
            user_id=payment.user_id,
            plan_id=payment.plan_id,
            amount=payment.amount,
            payment_method=payment.payment_method,
            status=payment.status,
            transaction_id=payment.transaction_id,
            created_time=payment.created_time,
            updated_time=payment.updated_time,
        )
        for payment in payments
    ]

    return PaymentListResponse(payments=result, total_count=len(result))


@payment_router.get("/payments/user/{user_id}", response_model=PaymentListResponse)
async def get_user_payment_history(
    user_id: str, current_user: User = Depends(get_current_active_user)
):
    # Optionally, you can check if the current user has permission to view this user's payment history
    if current_user.user_type != UserType.ADMIN and current_user.id != user_id:
        raise HTTPException(
            status_code=403,
            detail="User does not have permission to view this payment history",
        )

    payments = await Payment.filter(user_id=user_id)

    result = [
        PaymentResponse(
            id=str(payment.id),
            user_id=payment.user_id,
            plan_id=payment.plan_id,
            amount=payment.amount,
            payment_method=payment.payment_method,
            status=payment.status,
            transaction_id=payment.transaction_id,
            created_time=payment.created_time,
            updated_time=payment.updated_time,
        )
        for payment in payments
    ]

    return PaymentListResponse(payments=result, total_count=len(result))