import React, { useState, useRef, useEffect } from "react";
import QrScanner from "qr-scanner";  // Import qr-scanner
import { getImageUrl } from "../helpers/itemHelper";
import { getCafe, saveCafeDetails } from "../helpers/cafeHelpers";
import Switch from "react-switch"; // Import the Switch component
import styles from "./PaymentOptions.module.css";

const SetPaymentQr = ({ shopId, qrCodeUrl }) => {
  const [qrPosition, setQrPosition] = useState([50, 50]); // legacy kept for API compatibility
  const [qrSize, setQrSize] = useState(50); // legacy kept for API compatibility
  const [qrPayment, setQrPayment] = useState();
  const [qrPaymentFile, setQrPaymentFile] = useState();
  const [qrCodeDetected, setQrCodeDetected] = useState(false);
  const [isNeedConfirmationState, setIsNeedConfirmationState] = useState(0);
  const [isQRISavailable, setIsQRISavailable] = useState(0);
  const qrPaymentInputRef = useRef(null);
  const qrCodeContainerRef = useRef(null);

  const [qrCodeData, setQrCodeData] = useState(null);
  const [cafe, setCafe] = useState({});

  const [isConfigQRIS, setIsConfigQRIS] = useState(false);
  const [isOpenBillAvailable, setIsOpenBillAvailable] = useState(false);
  const [saving, setSaving] = useState(false);
  const [saveStatus, setSaveStatus] = useState(null); // 'success' | 'error'
  const [copied, setCopied] = useState(false);

  useEffect(() => {
    const fetchCafe = async () => {
      try {
        const response = await getCafe(shopId);
        setCafe(response);
        setQrPayment(getImageUrl(response.qrPayment));
        console.log(response.needsConfirmation);

        setIsNeedConfirmationState(response.needsConfirmation === true ? 1 : 0); // Set state based on fetched data
        setIsQRISavailable(response.isQRISavailable === true ? 1 : 0); // Set state based on fetched data
        setIsOpenBillAvailable(response.isOpenBillAvailable === true ? 1 : 0); // Set state based on fetched data
        setQrPosition([response.xposition, response.yposition]);
        setQrSize(response.scale);
      } catch (error) {
        console.error("Error fetching cafe:", error);
      }
    };
    fetchCafe();
  }, [shopId]);


  // Handle file input change
  const handleFileChange = (e) => {
    const file = e.target.files[0];
    if (file) {
      const newqrPayment = URL.createObjectURL(file);
      setQrPayment(newqrPayment);
      setQrPaymentFile(file);
    }
  };

  useEffect(() => {
    if (qrPayment && isConfigQRIS) {
      detectQRCodeFromContainer();
    }
  }, [qrPayment, isConfigQRIS]);

  const detectQRCodeFromContainer = () => {
    const container = qrCodeContainerRef.current;
    if (!container) return;

    const img = new Image();
    img.crossOrigin = "Anonymous";
    img.src = qrPayment;

    img.onload = () => {
      // Buat canvas dari image
      const canvas = document.createElement("canvas");
      const context = canvas.getContext("2d");
      canvas.width = img.width;
      canvas.height = img.height;
      context.drawImage(img, 0, 0);

      // Ambil data URL dari canvas (png)
      const imageDataUrl = canvas.toDataURL();

      QrScanner.scanImage(imageDataUrl, { returnDetailedScanResult: true })
        .then(result => {
          setQrCodeDetected(true);
          setQrCodeData(result.data);
          console.log("QR Code detected:", result.data);
        })
        .catch(() => {
          setQrCodeDetected(false);
          setQrCodeData(null);
          console.log("QR Code not detected");
        });
    };

    img.onerror = () => {
      setQrCodeDetected(false);
      setQrCodeData(null);
    };
  };

  // Save cafe details
  const handleSave = async () => {
    setSaving(true);
    setSaveStatus(null);
    let qrPaymentFileCache;
    console.log(qrPaymentFile)
    if(qrPaymentFile != null)
      qrPaymentFileCache = qrPaymentFile;

    const details = {
      qrPosition,
      qrSize,
      qrPaymentFile: qrPaymentFileCache,
      isQRISavailable: isQRISavailable === 1,
      isOpenBillAvailable: isOpenBillAvailable === 1,
      isNeedConfirmationState: isNeedConfirmationState === 1
    };

    try {
      const response = await saveCafeDetails(cafe.cafeId, details);
      setIsNeedConfirmationState(response.needsConfirmation ? 1 : 0);
      setIsQRISavailable(response.isQRISavailable ? 1 : 0);
      setIsOpenBillAvailable(response.isOpenBillAvailable ? 1 : 0);
      setSaveStatus('success');
      console.log("Cafe details saved:", response);
    } catch (error) {
      console.error("Error saving cafe details:", error);
      setSaveStatus('error');
    } finally {
      setSaving(false);
    }
  };

  const copyQrData = async () => {
    if (!qrCodeData) return;
    try {
      await navigator.clipboard.writeText(qrCodeData);
      setCopied(true);
      setTimeout(()=>setCopied(false), 1200);
    } catch {}
  };

  return (
    <div className={styles.container}>
      <h3 className={styles.title}>Konfigurasi pembayaran</h3>

      <div className={styles.section}>
        <div className={styles.sectionHeader}>
          <div>
            <div className={styles.sectionTitle}>Pembayaran QRIS</div>
            <div className={styles.sectionDesc}>Aktifkan agar pelanggan dapat membayar via QRIS. Kasir tetap perlu verifikasi rekening.</div>
          </div>
          <Switch
            onChange={(checked) => setIsQRISavailable(checked ? 1 : 0)}
            checked={isQRISavailable === 1}
            offColor="#888"
            onColor="#4CAF50"
            uncheckedIcon={false}
            checkedIcon={false}
            height={25}
            width={50}
          />
        </div>

        <div className={styles.row}>
          <button
            type="button"
            className={`${styles.button} ${styles.configButton}`}
            onClick={() => isQRISavailable === 1 && setIsConfigQRIS(true)}
            disabled={isQRISavailable !== 1}
          >
            Konfigurasi QRIS
          </button>
        </div>

        {isConfigQRIS && (
          <>
            <div
              id="qr-code-container"
              ref={qrCodeContainerRef}
              className={styles.imageBox}
              onClick={() => qrPaymentInputRef.current.click()}
              style={{ backgroundImage: `url(${qrPayment})` }}
            >
              <input type="file" accept="image/*" ref={qrPaymentInputRef} style={{ display: 'none' }} onChange={handleFileChange} />
            </div>
            <div className={styles.smallNote}>Klik area untuk unggah/ganti gambar QR</div>
            <div className={styles.detectRow}>
              <div className={`${styles.tag} ${qrCodeDetected ? styles.tagOk : styles.tagBad}`}>
                {qrCodeDetected && qrPayment !== 'https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSPsNr0TPq8dHT3nBwDQ6OHQQTrqzVFoeBOmuWfgyErrLbJi6f6CnnYhpNHEvkJ_2X-kyI&usqp=CAU' ? 'QR terdeteksi' : 'Tidak ada QR terdeteksi'}
              </div>
              <button className={styles.button} onClick={() => qrPaymentInputRef.current.click()}>{qrPayment ? 'Ganti' : 'Unggah'}</button>
            </div>
            {qrCodeDetected && (
              <div className={styles.copyRow}>
                <input className={styles.linkField} readOnly value={qrCodeData || ''} />
                <button className={styles.button} onClick={copyQrData}>{copied ? 'Disalin' : 'Salin'}</button>
              </div>
            )}
            <div className={styles.actionsRight}>
              <button className={`${styles.button} ${styles.primary}`} onClick={() => setIsConfigQRIS(false)}>Terapkan</button>
            </div>
          </>
        )}
      </div>

      <div className={styles.section}>
        <div className={styles.sectionHeader}>
          <div>
            <div className={styles.sectionTitle}>Open bill</div>
            <div className={styles.sectionDesc}>Izinkan pelanggan menambah pesanan dalam satu sesi dan bayar di akhir.</div>
          </div>
          <Switch
            onChange={(checked) => setIsOpenBillAvailable(checked ? 1 : 0)}
            checked={isOpenBillAvailable === 1}
            offColor="#888"
            onColor="#4CAF50"
            uncheckedIcon={false}
            checkedIcon={false}
            height={25}
            width={50}
          />
        </div>
      </div>

      <div className={styles.section}>
        <div className={styles.sectionHeader}>
          <div>
            <div className={styles.sectionTitle}>Pengecekan ganda</div>
            <div className={styles.sectionDesc}>Kasir memeriksa kembali ketersediaan item sebelum pembayaran.</div>
          </div>
          <Switch
            onChange={(checked) => setIsNeedConfirmationState(checked ? 1 : 0)}
            checked={isNeedConfirmationState === 1}
            offColor="#888"
            onColor="#4CAF50"
            uncheckedIcon={false}
            checkedIcon={false}
            height={25}
            width={50}
          />
        </div>
      </div>

      <div className={styles.footer}>
        <div>
          {saveStatus === 'success' && <span className={`${styles.banner} ${styles.bannerSuccess}`}>Simpan berhasil</span>}
          {saveStatus === 'error' && <span className={`${styles.banner} ${styles.bannerError}`}>Gagal menyimpan</span>}
        </div>
        <button className={`${styles.button} ${styles.primary}`} onClick={handleSave} disabled={saving}>
          {saving ? 'Menyimpan…' : 'Simpan'}
        </button>
      </div>
    </div>
  );
};

export default SetPaymentQr;