import React, { useState, useEffect } from "react";
import { ViewMode } from "../../services/types";
import { useLocation, useNavigate } from "react-router-dom";
import { useQuery } from "@tanstack/react-query";
import {
  Area,
  CheckoutDetailResponse,
  Package,
  PaymentChannel,
} from "../../services/product/type";
import { DataCacheKey, staleTime } from "../../global/constants";
import {
  startLoading,
  startSmallLoading,
  stopLoading,
  stopSmallLoading,
} from "../../features/loading/loadingSlice";
import { useAppDispatch, useAppSelector } from "../../hooks/useRedux";
import { productApi } from "../../apis/productApi";
import { openPopup } from "../../features/popup/popupSlice";
import { formatNumber } from "../../logic/loigicUtils";
import { useTranslation } from "react-i18next";

const CheckoutView = () => {
  const navigate = useNavigate();
  const dispatch = useAppDispatch();
  const { t } = useTranslation();
  const loading = useAppSelector((state) => state.loading);
  const accountInfo = localStorage.getItem("accountInfo");
  const [paymentMethod, setPaymentMethod] = useState("card");
  const [form, setForm] = useState({
    firstName: "",
    lastName: "",
    email: accountInfo != null ? JSON.parse(accountInfo).email : "",
    confirmEmail: accountInfo != null ? JSON.parse(accountInfo).email : "",
    phone: "",
  });
  const [agreements, setAgreements] = useState({
    terms: false,
    esim: false,
    vatInvoice: false,
  });
  // get data from previous step
  const location = useLocation();
  const state = location.state as {
    area: Area;
    package: Package;
    quantity: number;
    simType: "eSIM" | "Physical";
    checkoutDetails: CheckoutDetailResponse;
  };

  const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const { name, value } = e.target;
    setForm((prev) => ({ ...prev, [name]: value }));
  };

  const handleSubmit = async () => {
    console.log(form);
    if (form.email !== form.confirmEmail) {
      dispatch(
        openPopup({
          isSuccess: false,
          title: "Error",
          message: "Email and Confirm Email do not match.",
        })
      );
      return;
    }
    // proceed to payment
    dispatch(startSmallLoading());
    const res = await productApi.confirmOrder({
      surName: form.lastName,
      lastName: form.firstName,
      email: form.email,
      phoneNumber: form.phone,
      paymentChannelId: paymentMethod,
      packgId: state.package.id,
      quantity: state.quantity,
    });
    console.log("Confirm order response:", res);
    dispatch(stopSmallLoading());
    if (res.errorCode === "0") {
      // open other website to pay
      window.location.href = res.data.paymentUrl;
    } else {
      dispatch(
        openPopup({
          isSuccess: false,
          title: "Error",
          message: res.message || "Failed to confirm order.",
        })
      );
    }
  };
  const handleCheckboxChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const { name, checked } = e.target;
    setAgreements((prev) => ({
      ...prev,
      [name]: checked,
    }));
  };
  const { data: loadPaymentChannel = [] } = useQuery<PaymentChannel[]>({
    queryKey: [DataCacheKey.PAYMENT_CHANNELS],
    queryFn: async (): Promise<PaymentChannel[]> => {
      try {
        dispatch(startLoading({}));
        const res = await productApi.loadPaymentChannel();
        // save to redux store
        return res.data as PaymentChannel[];
      } catch (error) {
        console.error(error);
        return []; // 🔴 bắt buộc
      } finally {
        dispatch(stopLoading());
      }
    },
    staleTime: staleTime,
  });

  useEffect(() => {
    setPaymentMethod(loadPaymentChannel[0]?.id);
    dispatch(stopSmallLoading());
  }, [loadPaymentChannel]);

  // Styles matching LoginView inputs
  const inputClass =
    "w-full bg-slate-50 border-2 border-transparent focus:border-[#EE0434]/20 rounded-2xl py-3 md:py-4 px-5 focus:outline-none focus:bg-white transition-all text-slate-700 font-bold placeholder:text-slate-300";
  const labelClass =
    "block text-slate-400 font-black text-[14px] uppercase tracking-[0.2em] pl-1 mb-2";

  if (!state.checkoutDetails) {
    return null;
  }
  return (
    <div className="bg-white min-h-screen pb-20">
      {/* Header / Breadcrumb */}
      <div className="max-w-7xl mx-auto px-4 py-4 md:py-6 border-b border-slate-50">
        <div className="flex items-center space-x-2">
          <button
            onClick={() => navigate(-1)}
            className="flex items-center text-slate-900 font-bold hover:text-[#EE0434] transition-colors text-[18px]"
          >
            <svg
              className="w-5 h-5 mr-1"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              <path
                strokeLinecap="round"
                strokeLinejoin="round"
                strokeWidth={2.5}
                d="M15 19l-7-7 7-7"
              />
            </svg>
            {t("continueShopping")}
          </button>
        </div>
      </div>

      <div className="max-w-3xl mx-auto px-4 py-8 md:py-12">
        {/* Progress Steps */}
        <div className="flex justify-center mb-12">
          <div className="flex items-center w-full max-w-sm text-xs font-bold">
            <div className="flex flex-col items-center gap-2">
              <div className="w-8 h-8 rounded-full bg-[#00c087] text-white flex items-center justify-center">
                <svg
                  className="w-4 h-4"
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                >
                  <path
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    strokeWidth={3}
                    d="M5 13l4 4L19 7"
                  />
                </svg>
              </div>
              <span className="text-[#00c087] text-[14px]">
                {t("chooseProduct")}
              </span>
            </div>
            <div className="flex-1 h-0.5 bg-slate-200 mx-2 mb-6"></div>
            <div className="flex flex-col items-center gap-2">
              <div className="w-8 h-8 rounded-full bg-[#0071e3] text-white flex items-center justify-center">
                2
              </div>
              <span className="text-[#0071e3] text-center text-[14px]">
                {t("orderInformation")}
              </span>
            </div>
            <div className="flex-1 h-0.5 bg-slate-200 mx-2 mb-6"></div>
            <div className="flex flex-col items-center gap-2">
              <div className="w-8 h-8 rounded-full bg-white border border-slate-200 text-slate-300 flex items-center justify-center">
                3
              </div>
              <span className="text-slate-300 text-[14px]">
                {t("paymentPayment")}
              </span>
            </div>
          </div>
        </div>

        <div className="space-y-10">
          {/* Customer Information */}
          <div>
            <h2 className="text-xl font-black text-[#003459] mb-6">
              {t("customerInformation")}
            </h2>
            <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
              <div className="space-y-1">
                <label className={labelClass}>
                  {t("lastName")} <span className="text-red-500">*</span>
                </label>
                <input
                  type="text"
                  className={inputClass}
                  placeholder="Doe"
                  onChange={handleChange}
                  value={form.lastName}
                  name="lastName"
                />
              </div>
              <div className="space-y-1">
                <label className={labelClass}>
                  {t("firstName")} <span className="text-red-500">*</span>
                </label>
                <input
                  type="text"
                  className={inputClass}
                  placeholder="John"
                  onChange={handleChange}
                  value={form.firstName}
                  name="firstName"
                />
              </div>
              <div className="space-y-1">
                <label className={labelClass}>
                  {t("emailEmail")} <span className="text-red-500">*</span>
                </label>
                <input
                  type="email"
                  className={inputClass}
                  placeholder="john@example.com"
                  onChange={handleChange}
                  value={form.email}
                  name="email"
                />
              </div>
              <div className="space-y-1">
                <label className={labelClass}>
                  {t("confirmEmail")} <span className="text-red-500">*</span>
                </label>
                <input
                  type="email"
                  className={inputClass}
                  placeholder="john@example.com"
                  onChange={handleChange}
                  value={form.confirmEmail}
                  name="confirmEmail"
                />
              </div>
              <div className="md:col-span-2 space-y-1">
                <label className={labelClass}>{t("phoneNumber")}</label>
                <input
                  type="tel"
                  className={inputClass}
                  placeholder="+1 234 567 890"
                  onChange={handleChange}
                  value={form.phone}
                  name="phone"
                />
              </div>
            </div>
          </div>

          {/* Order Info */}
          <div className="bg-slate-50/50 rounded-3xl p-6 border border-slate-100">
            <h2 className="text-xl font-black text-[#003459] mb-6">
              {t("orderInformation")}
            </h2>
            <div className="flex justify-between items-center">
              <div className="flex items-center gap-4">
                <img
                  src={`${state.area.iconUrl}`}
                  className="w-10 h-10 rounded-full object-cover border-2 border-white shadow-sm"
                />
                <div>
                  <h3 className="font-black text-slate-800 text-lg">
                    eSIM {state.area.areaName1}
                  </h3>
                  <p className="text-xs text-slate-500 font-bold uppercase tracking-wide mt-1">
                    {/* {state.package.amountData} -  */}
                    {state.package.dayDuration} days • x{state.quantity}
                  </p>
                </div>
              </div>
              <div className="text-right">
                <p className="text-xs text-slate-400 line-through font-bold">
                  {formatNumber(state.checkoutDetails.totalMoney)}{" "}
                  {state.checkoutDetails.curency}
                </p>
                <p className="text-[#0071e3] font-black text-xl">
                  {formatNumber(state.checkoutDetails.paymentMoney)}{" "}
                  {state.checkoutDetails.curency}
                </p>
              </div>
            </div>
          </div>

          {/* Payment Method */}
          <div>
            <h2 className="text-xl font-black text-[#003459] mb-6">
              {t("paymentPayment")}
            </h2>
            <div className="space-y-3">
              {loadPaymentChannel.map((method) => (
                <label
                  key={method.id}
                  className={`flex items-center p-4 border rounded-2xl cursor-pointer transition-all ${
                    paymentMethod === method.id
                      ? "bg-blue-50 border-blue-200"
                      : "border-slate-100 hover:bg-slate-50"
                  }`}
                >
                  <input
                    type="radio"
                    name="payment"
                    checked={paymentMethod === method.id}
                    onChange={() => setPaymentMethod(method.id)}
                    className="w-5 h-5 text-[#EE0434] border-slate-300 focus:ring-[#EE0434]"
                  />
                  <span className="ml-4 font-bold text-slate-700 flex items-center gap-3">
                    <span className="text-xl w-6 text-center">
                      {/* {method.imgUrl} */}
                    </span>{" "}
                    {method.name}
                  </span>
                </label>
              ))}
            </div>
          </div>

          {/* Terms */}
          <div className="space-y-3 pt-2 px-1">
            <label className="flex items-start cursor-pointer group">
              <input
                type="checkbox"
                name="terms"
                checked={agreements.terms}
                onChange={handleCheckboxChange}
                className="mt-1 w-4 h-4 rounded border-slate-300 text-[#0071e3] focus:ring-[#0071e3]"
              />
              <span className="ml-3 text-sm text-slate-500 font-medium group-hover:text-slate-700 transition-colors">
                {t("iService")}{" "}
                <a
                  href="#"
                  className="text-[#0071e3] font-bold hover:underline"
                >
                  {t("termsService")}
                </a>
              </span>
            </label>
            <label className="flex items-start cursor-pointer group">
              <input
                type="checkbox"
                className="mt-1 w-4 h-4 rounded border-slate-300 text-[#0071e3] focus:ring-[#0071e3]"
                name="esim"
                checked={agreements.esim}
                onChange={handleCheckboxChange}
              />
              <span className="ml-3 text-sm text-slate-500 font-medium group-hover:text-slate-700 transition-colors">
                {t("iUnlocked")}
              </span>
            </label>
            <label className="flex items-start cursor-pointer group">
              <input
                type="checkbox"
                className="mt-1 w-4 h-4 rounded border-slate-300 text-[#0071e3] focus:ring-[#0071e3]"
                name="vatInvoice"
                checked={agreements.vatInvoice}
                onChange={handleCheckboxChange}
              />
              <span className="ml-3 text-sm text-slate-500 font-medium group-hover:text-slate-700 transition-colors">
                {t("iInvoice")}
              </span>
            </label>
          </div>

          {/* Overview Card */}
          <div className="bg-[#eef6f8] rounded-[32px] p-8 mt-8">
            <h2 className="text-xl font-black text-[#003459] mb-6">Overview</h2>

            <div className="relative mb-8">
              <input
                type="text"
                placeholder="Promo code"
                className="w-full bg-white border-2 border-transparent focus:border-[#0071e3]/20 rounded-2xl py-4 px-6 focus:outline-none transition-all text-slate-700 font-bold placeholder:text-slate-300"
              />
              <button className="absolute right-3 top-2 bottom-2 text-[#0071e3] font-black text-sm px-4 hover:bg-blue-50 rounded-xl transition-colors">
                {t("apply")}
              </button>
            </div>

            <div className="space-y-4 mb-8">
              <div className="flex justify-between text-slate-600 font-bold">
                <span>{t("subtotal")}:</span>
                <span>
                  {formatNumber(
                    state.checkoutDetails.totalMoney * state.quantity
                  )}{" "}
                  {state.checkoutDetails.curency}
                </span>
              </div>
              <div className="flex justify-between text-green-600 font-bold">
                <span>Discount:</span>
                <span>
                  -{formatNumber(0 * state.quantity)}{" "}
                  {state.checkoutDetails.curency}
                </span>
              </div>
              <div className="flex justify-between items-center pt-4 border-t border-slate-200/50">
                <span className="text-[#0071e3] font-black text-xl">
                  {t("totalTotal")} ({state.quantity}):
                </span>
                <span className="text-[#0071e3] font-black text-3xl">
                  {formatNumber(state.checkoutDetails.paymentMoney)}{" "}
                  {state.checkoutDetails.curency}
                </span>
              </div>
            </div>

            <button
              className={`w-full py-4 md:py-5 rounded-2xl font-black text-xl md:text-2xl shadow-lg transition-all flex items-center justify-center space-x-3 ${
                form.firstName &&
                form.lastName &&
                form.email &&
                agreements.terms &&
                agreements.esim &&
                !loading.isSmallLoading
                  ? "bg-[#EE0434] text-white hover:scale-[1.01] active:scale-[0.98]"
                  : "bg-slate-100 text-slate-300 cursor-not-allowed"
              }`}
              disabled={
                !form.firstName ||
                !form.lastName ||
                !form.email ||
                !agreements.terms ||
                !agreements.esim ||
                loading.isSmallLoading
              }
              onClick={handleSubmit}
            >
              {loading.isSmallLoading && (
                <div className="w-5 h-5 border-3 border-white/30 border-t-red-500 rounded-full animate-spin"></div>
              )}
              <span>{t("checkout")}</span>
            </button>
          </div>
        </div>
      </div>
    </div>
  );
};

export default CheckoutView;
