import React, { useState, useEffect } from 'react';
import styles from './ProductDetail.module.css';
import { useNavigate } from 'react-router-dom';

const ProductDetail = ({ willDo, setWillDo, subscriptions, product, requestLogin, setShowedModal }) => {
  const [showChildSelector, setShowChildSelector] = useState(false);
  const [selectedChildIds, setSelectedChildIds] = useState([]);

  const [matchingSubscriptions, setMatchingSubscriptions] = useState([]);
  const [selectedSubscriptionId, setSelectedSubscriptionId] = useState(0);
  const [showSubscriptionSelector, setShowSubscriptionSelector] = useState(false);

  const [showNamingInput, setShowNamingInput] = useState(false);
  const [customName, setCustomName] = useState('');

  const navigate = useNavigate();

  const onCheckout = () => {
    const tokenCookie = document.cookie.split('; ').find(row => row.startsWith('token='));
    const token = tokenCookie ? tokenCookie.split('=')[1] : '';

    if (!token) {
      requestLogin('checkout');
      return;
    }
    if (product.type == 'product') {
      const hasMatchingSubscription = Array.isArray(subscriptions) &&
        subscriptions.some(sub =>
          String(sub.product_id) === String(product.id) || String(sub.product_parent_id) === String(product.id)
        );

      // Always show children selector first if product has children
      if (product.children && product.children.length > 0) {
        setShowChildSelector(true);

        if (hasMatchingSubscription) {
          const matching = subscriptions.filter(sub =>
            String(sub.product_id) === String(product.id) || String(sub.product_parent_id) === String(product.id)
          );

          if (matching.length > 0) {
            // ✅ Select only the first for each product_name
            const uniqueByName = Array.from(
              new Map(matching.map(sub => [sub.product_name, sub])).values()
            );

            setMatchingSubscriptions(uniqueByName);
          }
        }
        return;
      }

      // No children, but has subscription match
      if (hasMatchingSubscription) {
        const matching = subscriptions.filter(sub =>
          String(sub.product_id) === String(product.id) || String(sub.product_parent_id) === String(product.id)
        );

        if (matching.length > 0 && !product.end_date) {
          const uniqueByName = Array.from(
            new Map(matching.map(sub => [sub.product_name, sub])).values()
          );

          setMatchingSubscriptions(uniqueByName);
          setShowSubscriptionSelector(true);
          return;
        }
        else {
          const itemsParam = JSON.stringify([product.id]);
          window.location.href = `https://checkout.kediritechnopark.com/?token=${token}&itemsId=${itemsParam}&set_name=${product.name}&redirect_uri=https://kediritechnopark.com/products&redirect_failed=https://kediritechnopark.com`;
          return;
        }
      }

      setShowNamingInput(true);
      return;

    }
    // No children, no matching subscription
    const itemsParam = JSON.stringify([product.id]);
    window.location.href = `https://checkout.kediritechnopark.com/?token=${token}&itemsId=${itemsParam}&redirect_uri=https://kediritechnopark.com/products&redirect_failed=https://kediritechnopark.com`;
  };

  const onConfirmChildren = () => {
    if (matchingSubscriptions.length > 0 && !product.executeCheckout) {
      setShowChildSelector(false);
      setShowSubscriptionSelector(true);
      return;
    }
    else if (!product.executeCheckout){
      setShowChildSelector(false);
      setShowNamingInput(true);
    }

    const tokenCookie = document.cookie.split('; ').find(row => row.startsWith('token='));
    const token = tokenCookie ? tokenCookie.split('=')[1] : '';

    if (selectedChildIds.length === 0) {
      alert('Pilih minimal satu produk');
      return;
    }
    const encodedName = encodeURIComponent(product.executeCheckout);
    const itemsParam = selectedChildIds.length > 0 ? JSON.stringify(selectedChildIds) : JSON.stringify([product.id]);
    window.location.href = `https://checkout.kediritechnopark.com/?token=${token}&itemsId=${itemsParam}&set_name=${encodedName}&redirect_uri=https://kediritechnopark.com/products&redirect_failed=https://kediritechnopark.com`;
  };

  const onFinalCheckoutNewProduct = () => {
    if (!customName.trim()) {
      alert('Nama produk tidak boleh kosong');
      return;
    }

    const tokenCookie = document.cookie.split('; ').find(row => row.startsWith('token='));
    const token = tokenCookie ? tokenCookie.split('=')[1] : '';
    const itemsParam = selectedChildIds.length > 0 ? JSON.stringify(selectedChildIds) : JSON.stringify([product.id]);
    const encodedName = encodeURIComponent(customName.trim());

    window.location.href = `https://checkout.kediritechnopark.com/?token=${token}&itemsId=${itemsParam}&new_name=${encodedName}&redirect_uri=https://kediritechnopark.com/products&redirect_failed=https://kediritechnopark.com`;
  };

  const onConfirmSelector = () => {
    if (selectedSubscriptionId == null) {
      alert('Pilih salah satu langganan.');
      return;
    }

    if (selectedSubscriptionId === 0) {
      setShowNamingInput(true);
    } else {
      const tokenCookie = document.cookie.split('; ').find(row => row.startsWith('token='));
      const token = tokenCookie ? tokenCookie.split('=')[1] : '';
      const itemsParam = selectedChildIds.length > 0 ? JSON.stringify(selectedChildIds) : JSON.stringify([product.id]);
      const selectedSubscription = matchingSubscriptions.find(
        (sub) => sub.id === selectedSubscriptionId
      );

      const productName = selectedSubscription?.product_name;
      const encodedName = encodeURIComponent(productName);

      window.location.href = `https://checkout.kediritechnopark.com/?token=${token}&itemsId=${itemsParam}&set_name=${encodedName}&redirect_uri=https://kediritechnopark.com/products&redirect_failed=https://kediritechnopark.com`;
    }
  };

  useEffect(() => {
    if (willDo === 'checkout') {
      onCheckout();
    }
    if(setWillDo) setWillDo(''); // Reset willDo after handling
  }, []);

  const priceColor = product.price === 0 ? '#059669' : '#2563eb';
  console.log(product)
  return (
    <div className={styles.container}>
      {!showChildSelector && !showSubscriptionSelector && !showNamingInput && (
        <>
          <div className={styles.image} style={{ backgroundImage: `url(${product.image})` }}></div>
          <div className={styles.headerRow}>
            <h2 className={styles.title}>{product.name.split('%%%')[0]}</h2>
            <div className={styles.price} style={{ color: priceColor }}>
              {product.price == null ? 'Pay-As-You-Go' : `Rp ${parseInt(product.price).toLocaleString('id-ID')}`}
            </div>
          </div>
          <p className={styles.description}>{product.description}</p>
          <div className={styles.buttonGroup}>
            {(product.site_url || product.end_date || product.quantity) && (
              <button
                className={`${styles.button} ${styles.checkoutButton}`}
                onClick={() => {
                  const token = (document.cookie.split('; ').find(row => row.startsWith('token=')) || '').split('=')[1] || '';
                  const url = product.quantity || product.end_date
                    ? `https://${product.site_url}/dashboard/${product.name.split('%%%')[0]}?token=${token}`
                    : `https://${product.site_url}`;
                  window.location.href = url;
                }}
              >
                {product.end_date || product.quantity ? 'KUNJUNGI SITUS' : 'PELAJARI LEBIH LANJUT'}
              </button>
            )}

            <button className={`${styles.button} ${styles.checkoutButton}`} onClick={onCheckout}>
              {Array.isArray(subscriptions) &&
                subscriptions.some(sub =>
                  sub.product_id === product.id || sub.product_parent_id === product.id
                ) && product.end_date ? 'Perpanjang' : 'Checkout'}
            </button>

          </div>
        </>
      )}

      {showChildSelector && (
        <div className={styles.childSelector}>
          <h3>Pilih Paket</h3>
          {product.children.map(child => (
            <label key={child.id} className={styles.childProduct}>
              <input
                type="radio"
                value={child.id}
                checked={selectedChildIds.includes(child.id)}
                onChange={e => {
                  const checked = e.target.checked;
                  setSelectedChildIds(prev =>
                    checked ? [...prev, child.id] : prev.filter(id => id !== child.id)
                  );
                }}
              />
              <div style={{ display: 'flex', justifyContent: 'space-between' }}>
              <div>
              &nbsp;{child.name} 
              </div>
              <div>
              Rp {parseInt(child.price || 0).toLocaleString('id-ID')}
                </div>
                </div>
            </label>
          ))}
          <div className={styles.buttonGroup}>
            <button className={styles.button} onClick={() => setShowChildSelector(false)}>
              Kembali
            </button>
            <button className={styles.button} onClick={onConfirmChildren}>
              Lanjut ke Checkout
            </button>
          </div>
        </div>
      )}

      {showSubscriptionSelector && !showNamingInput && (
        <div className={styles.childSelector}>
          <h5>Kamu sudah punya produk ini</h5>
          <div className={styles.childProduct} onClick={()=>{setShowedModal('');navigate('/dashboard')}}>
            <div style={{ display: 'flex', justifyContent: 'space-between' }}>
              <div>Perpanjang produk ini</div>
              <div>➔</div>
            </div>
          </div>
          <h6>Atau</h6>
          <label className={styles.childProduct} onClick={()=>{setSelectedSubscriptionId(0); onConfirmSelector();}}>
            <div style={{ display: 'flex', justifyContent: 'space-between' }}>
              <div>Tambah {product.name.split('%%%')[0]} baru</div>
              <div>➔</div>
            </div>
          </label>
          <div className={styles.buttonGroup}>
            <button className={styles.button} onClick={() => setShowSubscriptionSelector(false)}>
              Kembali
            </button>
          </div>
        </div>
      )}

      {showNamingInput && (
        <div className={styles.childSelector}>
          <h5>Buat {product.name.split('%%%')[0]} Baru</h5>
          <input
            type="text"
            placeholder="Nama produk..."
            className={styles.input}
            value={customName}
            onChange={(e) => setCustomName(e.target.value)}
            style={{ width: '100%', padding: '8px', marginBottom: '16px', borderRadius: '10px' }}
          />

          {
            matchingSubscriptions.some(
              (sub) => sub.product_name === `${product.name}@${customName}`
            ) && (
              <p style={{ color: 'red', marginBottom: '10px' }}>
                Nama produk sudah digunakan.
              </p>
            )
          }

          <div className={styles.buttonGroup}>
            <button
              className={styles.button}
              onClick={() => {
                setShowNamingInput(false);

                const hasMatchingSubscription = Array.isArray(subscriptions) &&
                  subscriptions.some(sub =>
                    String(sub.product_id) === String(product.id) || String(sub.product_parent_id) === String(product.id)
                  );
                if (hasMatchingSubscription) setShowSubscriptionSelector(true);
              }}
            >
              Kembali
            </button>
            <button
              className={styles.button}
              onClick={onFinalCheckoutNewProduct}
              disabled={
                customName.trim() === '' ||
                matchingSubscriptions.some(
                  (sub) => sub.product_name === `${product.name}@${customName}`
                )
              }
            >
              Checkout
            </button>
          </div>
        </div>
      )}

    </div>
  );
};

export default ProductDetail;