"use client";

import Image from "next/image";
import { Ref, useImperativeHandle } from "react";
import { useForm, get } from "react-hook-form";
import { CheckoutPaymentMethod } from "@/types/checkout/type";
import { AirwallexCardElements } from "@/lib/Airwallex/airwallexInit";
import { useCustomToast } from "@/utils/hooks/useToast";
import AirwallexCardInput from "./PaymentMethodAdditional/AirwallexCardInput";
import {useAirwallexCard} from "@/lib/Airwallex/useAirwallexCard";

/**
 * 关于如何确定默认选中哪个支付方式：
 * 从购物车详情中获取支付方式 A，支付方式列表中有A，那么把A标记为默认选中；如果支付方式列表中没有A，把paypal标记为默认选中；
 */
export interface RefPaymentMethodsHandle {
  getSelectPaymentMethod: () => string;
  getSelectPaymentTitle: () => string;
  validatePaymentMethod: () => Promise<boolean>;
  getAirwallexCardElements: () => AirwallexCardElements;
  validateAirwallexCard: () => boolean;
}
export function PaymentMethodCheckout({
    ref,
    paymentMethods,
    selectedPaymentMethod,
    onPaymentMethodChange,
}: {
    ref: Ref<RefPaymentMethodsHandle>;
    paymentMethods: CheckoutPaymentMethod[];
    selectedPaymentMethod: string;
    onPaymentMethodChange: (value: string) => Promise<boolean>;
}) {

    const { showToast } = useCustomToast();


    const {airwallexCardState,getCardElements} = useAirwallexCard(true,{
        cardNumber: 'airwallex_cardNumber', 
        cvc: 'airwallex_cvc', 
        expiry: 'airwallex_expiry'
    });
  
    let defaultValue = '';
 
    const findItem = paymentMethods.find((item) => item.method === selectedPaymentMethod);
    if(findItem !== undefined) {
        defaultValue = selectedPaymentMethod;

    } else {
        paymentMethods.forEach((item) => {
            if(item.method === 'paypal_smart_button') {
                defaultValue = item.method;
            }
        });
    }

  
    const {
        register,
        getValues,
        trigger,
        formState: { errors }
    } = useForm({
        mode: "onChange",
        reValidateMode: "onChange", 
        defaultValues: {
            paymentMethod: defaultValue,
        }
    });

    // 参考 https://github.com/react-hook-form/error-message/blob/master/src/ErrorMessage.tsx
    const paymentMethodError = get(errors, "paymentMethod");

    const paymentMethodOnChange = async (event: React.ChangeEvent<HTMLInputElement>) => {

        onPaymentMethodChange(event.target.value);                                
    };

    useImperativeHandle(ref, () => {
        return {
            // 获取用户选择的支付方式
            getSelectPaymentMethod: () => {
                return getValues('paymentMethod');
            },
            getSelectPaymentTitle: () => {
                const nowValue = getValues('paymentMethod');
                const findItem = paymentMethods.find((item) => item.method === nowValue);
                return findItem?.title ?? '';
            },
            // 触发校验
            validatePaymentMethod: () => {
                return trigger();
            },
            // 获取airwallex card 支付创建的elements
            getAirwallexCardElements: () => {
                return getCardElements();
            },
            validateAirwallexCard: () => {

                if(!airwallexCardState.cardNumberReady) {
                    showToast('Card number input has not ready. Please wait a minute.', 'danger');
                    return false;
                }
                if(!airwallexCardState.expiryReady) {
                    showToast('Card expiry date input has not ready. Please wait a minute.', 'danger');
                    return false;
                }
                if(!airwallexCardState.cvcReady) {
                    showToast('Card cvc input has not ready. Please wait a minute.', 'danger');
                    return false;
                }

                if(!airwallexCardState.cardNumberValid) {
                    showToast('Please input your card number.', 'danger');
                    return false;
                }
                if(!airwallexCardState.cvcValid) {
                    showToast('Please input cvc.', 'danger');
                    return false;
                }
                if(!airwallexCardState.expiryValid) {
                    showToast('Please input expiry date.', 'danger');
                    return false;
                }
                return true;
            }
        }
        
    },[getCardElements,paymentMethods,airwallexCardState]);

    const airwallexOtherInfoShow = selectedPaymentMethod === 'airwallex' && airwallexCardState.cardNumberReady && airwallexCardState.expiryReady && airwallexCardState.cvcReady;

    
    return (
        <form name="shipping method" className="w-full">
        
            <div className="mt-3 w-full">
                <ul className="w-full">
                {
                    paymentMethods.map((item) => {
                        return (
                            <li className="w-full mt-3" key={item.method}>
                                <label htmlFor={"paymentmethod-" + item.method}
                                    className="group box-border flex items-center relative bg-ly-lightgray p-3 rounded-sm has-checked:bg-white has-checked:border-1 has-checked:border-ly-green"
                                >
                                    <p className="pr-2 flex-none relative">
                                        <Image className="block h-8 w-auto" width={32} height={32} src={item.icon || ''} alt={"Payment Method " + item.title} />
                                    </p>
                                    <p className="text-ly-12 text-[#666666] ml-1">{item.description}</p>

                                    <div className="absolute top-1/2 -translate-y-1/2 right-3 flex items-center">
                                        <svg className="check w-4 h-4 hidden group-has-[:checked]:block" xmlns="http://www.w3.org/2000/svg" xmlnsXlink="http://www.w3.org/1999/xlink" width="16" height="16" viewBox="0 0 16 16" fill="none"><rect  x="1" y="1" width="14" height="14" rx="1"    fill="#000000" ></rect><path    stroke="rgba(255, 255, 255, 1)" strokeWidth="1.5"  strokeLinecap="square"  d="M5.3335 8L7.3335 10L11.3335 6"></path></svg>
                                        <svg className="uncheck w-4 h-4 block group-has-[:checked]:hidden" xmlns="http://www.w3.org/2000/svg" xmlnsXlink="http://www.w3.org/1999/xlink" width="16" height="16" viewBox="0 0 16 16" fill="none"><rect  x="1" y="1" width="14" height="14" rx="1"    fill="#FFFFFF" ></rect><path   fill="rgba(0, 0, 0, 1)"  d="M2 0.5L14 0.5C14.8284 0.5 15.5 1.17157 15.5 2L15.5 14C15.5 14.8284 14.8284 15.5 14 15.5L2 15.5C1.17157 15.5 0.5 14.8284 0.5 14L0.5 2C0.5 1.17157 1.17157 0.5 2 0.5ZM2 1.5C1.72386 1.5 1.5 1.72386 1.5 2L1.5 14C1.5 14.2761 1.72386 14.5 2 14.5L14 14.5C14.2761 14.5 14.5 14.2761 14.5 14L14.5 2C14.5 1.72386 14.2761 1.5 14 1.5L2 1.5Z"></path></svg>
                                    </div>
                                    <input id={"paymentmethod-" + item.method}
                                        className="absolute w-6 h-6 opacity-0"
                                        type="radio"
                                        value={item.method}
                                        {...register('paymentMethod', {
                                            required: 'Please select a payment method.',
                                            onChange: (event) => {
                                                paymentMethodOnChange(event);
                                            },
                                        })}
                                    />
                                </label>
                                { item.method === "airwallex" &&
                                    <div className="w-full mt-3"
                                        style={{display: airwallexOtherInfoShow ? 'block' : 'none'}}
                                    >
                                        <AirwallexCardInput 
                                            cardNumberErrorMsg={airwallexCardState.cardNumberErrorMsg}
                                            expiryErrorMsg={airwallexCardState.expiryErrorMsg}
                                            cvcErrorMsg={airwallexCardState.cvcErrorMsg}
                                        />
                                    </div>
                                }
                            </li>
                        )
                    })
                }    
                </ul>  
                
                {paymentMethodError && <p className="text-red-500 text-ly-12">{paymentMethodError.message}</p>}  
            </div>
            
        </form>
    );
  
}