import React, { useState, useEffect } from "react";
import "./Payment.css";
import CartProducts from "../CartProducts/CartProducts";
import { useStateValue } from "../../context/StateProvider";
import { Link, useHistory } from "react-router-dom";
import { CardElement, useStripe, useElements } from "@stripe/react-stripe-js";
import CurrencyFormat from "react-currency-format";
import { getCartTotal } from "../../context/reducer";
import axios from "../../utils/axios";
import { db } from "../../firebase/firebaseConfig";

function Payment() {
  const [{ cart, user }, dispatch] = useStateValue();

  const history = useHistory();
  const stripe = useStripe();
  const elements = useElements();

  const [error, setError] = useState(null);
  const [disabled, setDisabled] = useState(true);
  const [processing, setProcessing] = useState("");
  const [succeeded, setSucceeded] = useState(false);
  const [clientSecret, setClientSecret] = useState(true);

  useEffect(() => {
    // generate the special stripe secret which allow us to charge a customer
    const getClientSecret = async () => {
      const response = await axios({
        method: "post",
        // Stripe expects the total in a currencies subunits
        url: `/payments/create?total=${getCartTotal(cart) * 100}`,
      });
      setClientSecret(response.data.clientSecret);
      console.log("secret is -> ", clientSecret);
    };

    getClientSecret();
  }, [cart]);

  const handleSubmit = async (e) => {
    // for all fancy stripe
    e.preventDefault();
    setProcessing(true);

    const payload = await stripe
      .confirmCardPayment(clientSecret, {
        payment_method: {
          card: elements.getElement(CardElement),
        },
      })
      .then(({ paymentIntent }) => {
        // payment intent = payment confirmation

        db.collection("users")
          .doc(user?.uid)
          .collection("orders")
          .doc(paymentIntent.id)
          .set({
            cart: cart,
            amount: paymentIntent.amount,
            created: paymentIntent.created,
          });

        setSucceeded(true);
        setError(null);
        setProcessing(false);

        dispatch({
          type: "EMPTY_BASKET",
        });

        history.replace("/orders");
      });
  };

  const handleChange = (e) => {
    // llisten for change of cardemelement
    // and display error
    setDisabled(false);
  };

  return (
    <div className="payment">
      <div className="payment__container">
        <h1>
          Checkout(<Link to="">{cart?.length} items</Link>)
        </h1>

        {/* Delivery address */}
        <div className="payment__section">
          <div className="payment__title">
            <h3>Delivery Address</h3>
          </div>
          <div className="payment__address">
            <p>{user?.email}</p>
            <p>123, React Lane</p>
            <p>Magarpatta, Pune</p>
          </div>
        </div>
        {/* review Items */}
        <div className="payment__section">
          <div className="payment__title">
            <h3>Review Items and Delivery</h3>
          </div>
          <div className="payment__items">
            {cart.map((item, index) => (
              <CartProducts
                key={index}
                id={item.id}
                title={item.title}
                price={item.price}
                rating={item.rating}
                image={item.image}
              />
            ))}
          </div>
        </div>
        {/* payment method */}
        <div className="payment__section">
          <div className="payment__title">
            <h3>Payment Method</h3>
          </div>
          <div className="payment__details">
            {/* Stripe Magic */}
            <form onSubmit={handleSubmit}>
              <CardElement onChange={handleChange} />
              <div className="payment__priceContainer">
                <CurrencyFormat
                  renderText={(value) => <h3>Order Total : {value}</h3>}
                  decimalScale={2}
                  value={getCartTotal(cart)}
                  displayType={"text"}
                  thousandSeparator={true}
                  prefix={"₹"}
                />

                <button disabled={processing || disabled || succeeded}>
                  <span>{processing ? <p>Processing</p> : <p>Buy Now</p>}</span>
                </button>
              </div>

              {error && <div>error</div>}
            </form>
          </div>
        </div>
      </div>
    </div>
  );
}

export default Payment;