"use client";


import {useRef,useState} from "react";
import { useRouter } from 'next/navigation';
import { usePlaceOrder } from "@/utils/hooks/usePlaceOrder";
import {
  usePayPal,
  useEligibleMethods,
  INSTANCE_LOADING_STATE,
  usePayPalOneTimePaymentSession,
  usePayPalGuestPaymentSession,
  usePayLaterOneTimePaymentSession,
  type OnApproveDataOneTimePayments,
  type OnErrorData,
  type OnCompleteData,
  type OnCancelDataOneTimePayments,
} from "@paypal/react-paypal-js/sdk-v6";
import { overlayLoading } from "@/components/theme/ui/kernel/loading/api";
import { confirmDialog } from "@/components/theme/ui/kernel/confirm/api";


export default function PaypalButton({
    createOrder,
    isRePay
}:{
  createOrder: () => Promise<{orderId: string;webOrderId: string;error: boolean;msg: string;}>;
  isRePay?: boolean;
}) { 
    const router = useRouter();

    const {createPaymentCallback} = usePlaceOrder();

    const [isPaying, setIsPaying] = useState(false);

    const gatewayOrderIdRef = useRef("");
    const webOrderIdRef = useRef("");
    // paypal sdk 是否加载完成
    const { loadingStatus } = usePayPal();

    // Fetch eligibility（资格） for one-time payment flow
    const {
        error: eligibilityError,
        eligiblePaymentMethods,
        isLoading: isEligibilityLoading,
    } = useEligibleMethods({
        payload: {
            currencyCode: "USD", // @todo 需要根据用户选择的货币走
            paymentFlow: "ONE_TIME_PAYMENT",
        },
    });
    const isLoading = loadingStatus === INSTANCE_LOADING_STATE.PENDING;
    const isPayLaterEligible =
        !isEligibilityLoading && eligiblePaymentMethods?.isEligible("paylater");
    //   const isCreditEligible =
    //     !isEligibilityLoading && eligiblePaymentMethods?.isEligible("credit");

    const handlerPaypalClick = async (buttonHandlerClick: () => Promise<void | {
        redirectURL?: string | undefined;
    }>) => {

            setIsPaying(true);
            const res = await createOrder();
            if(!res.error) {
                gatewayOrderIdRef.current = res.orderId;
                webOrderIdRef.current = res.webOrderId;
                return buttonHandlerClick();
            } else {
                setIsPaying(false);
            }
            
    }

    // paypal支付回调配置
    const paypalOnHandlerConfig = {
        createOrder: async () => {
            const res = {
                orderId: gatewayOrderIdRef.current, 
                webOrderId: webOrderIdRef.current
            };

            return res;
        },
        
        onApprove: async (data: OnApproveDataOneTimePayments) => {
            console.log("Payment approved:", data);
            const resCallback = await createPaymentCallback({
                orderId: Number(webOrderIdRef.current),
                gatewayOrderId: data.orderId || gatewayOrderIdRef.current,
                status: 'success',
            });
            overlayLoading.stop();
            if(!resCallback.error) {
                // 支付成功，跳转到成功落地页 
                confirmDialog({
                    title: "Payment Success",
                    content: "Your payment was successful. Will redirect to success page.",
                    noCancel: true,
                }).then(() => {
                    router.replace('/paymentresult/result?orderId=' + webOrderIdRef.current + '&return_result=success');
                });
            } else {
                // callback 失败，提示错误
                confirmDialog({
                    title: "Somthing Wrong",
                    content: resCallback.msg + " Please contact customer service." + " OrderId: "+ webOrderIdRef.current,
                    noCancel: true,
                }).then(() => { 
                    router.replace('/');
                });
                
            }

        },

        onCancel: async (data: OnCancelDataOneTimePayments) => {
            /**
             * {oederId: paypalOrderId}
             */
            console.log("Payment cancelled:", data);
            await createPaymentCallback({
                orderId: Number(webOrderIdRef.current),
                gatewayOrderId: data.orderId || gatewayOrderIdRef.current,
                status: 'cancel',
            });
            if(!isRePay) {
                overlayLoading.stop();
                router.replace('/paymentresult/result?orderId=' + webOrderIdRef.current + '&return_result=cancel');
                    

            } else {
                // 登录用户在二次支付页面 
                confirmDialog({
                    title: "Payment cancelled",
                    content: "You canceled the payment.",
                    noCancel: true,
                }).then(() => {  });
            }
        },

        onError: async (data: OnErrorData) => {
            console.error("Payment error:", data);
            /**
             * code: string;
                 name: string;
                isRecoverable: boolean;
            */
            await createPaymentCallback({
                orderId: Number(webOrderIdRef.current),
                gatewayOrderId: gatewayOrderIdRef.current,
                status: 'failure',
            });
            if(!isRePay) {
                overlayLoading.stop();
                router.replace('/paymentresult/result?orderId=' + webOrderIdRef.current + '&return_result=failure');

            } else {
                
                // 登录用户 二次支付页面 
                confirmDialog({
                    title: "Payment Failed",
                    content: data.message,
                    noCancel: true,
                }).then(() => {  });
            
            }
        
        },

        onComplete: (data: OnCompleteData) => {
            overlayLoading.stop();
            setIsPaying(false);
            console.log("Payment session completed");
            console.log("On Complete data:", data);
        },
        // onShippingAddressChange: (data) => {},
        // onShippingOptionsChange: (data) => {

        // }
    };

    const { 
        // isPending: paypalButtonPending, 
        error: paypalButtonError, 
        handleClick: paypalButtonHandleClick, 
    } = usePayPalOneTimePaymentSession({
        presentationMode: "auto",
        ...paypalOnHandlerConfig
    });

    const { 
        buttonRef: guestButtonRef, 
        // isPending: guestButtonPending, 
        error: guestButtonError, 
        handleClick: guestButtonHandleClick,
    } = usePayPalGuestPaymentSession(paypalOnHandlerConfig);

    const payLaterDetails = eligiblePaymentMethods?.getDetails("paylater");
    const { 
        // isPending: paylaterButtonPending, 
        // error: paylaterButtonError, 
        handleClick: paylaterButtonHandleClick, 
    } = usePayLaterOneTimePaymentSession({
        presentationMode: "auto",
        ...paypalOnHandlerConfig
    });

    return (
        <div className="w-full">
            {
                isLoading ? (
                    <div className="test-ly-12 font-medium text-center">
                        Loading paypal payment methods...
                    </div>
                ) : eligibilityError ? (
                    <div className="test-ly-12 font-medium text-center text-ly-errorcolor">
                        Failed to load paypal payment options. Please refresh the page.
                    </div>
                ) : (
                    <>
                        {paypalButtonError ? 
                            <p className="text-ly-errorcolor text-ly-12">Error: {paypalButtonError.message}</p>
                        :
                            <paypal-button onClick={() => {
                                return handlerPaypalClick(paypalButtonHandleClick);
                            }} type="pay" className="w-full" disabled={isPaying} />
                        }
                        {guestButtonError ?
                            <p className="text-ly-errorcolor text-ly-12">Error: {guestButtonError.message}</p>
                        :
                            <paypal-basic-card-container className="w-full mt-3">
                                <paypal-basic-card-button disabled={isPaying} ref={guestButtonRef} onClick={() => handlerPaypalClick(guestButtonHandleClick)} />
                            </paypal-basic-card-container>
                        }
                     
                        {isPayLaterEligible && 
                            <paypal-pay-later-button className="w-full mt-3" disabled={isPaying}
                                onClick={() => handlerPaypalClick(paylaterButtonHandleClick)}
                                countryCode={payLaterDetails?.countryCode}
                                productCode={payLaterDetails?.productCode}
                            />
                        }
                        
                    </>
                )
            }
  
        </div>
    );
}