import React, { useCallback, useEffect, useRef, useState } from 'react';
import { useDispatch } from 'react-redux';
import { Messages } from '../../../Components/Notifications/Messages';
import FormHeader from '../../PageComponents/FormHeader';
import PublicQrCodeShare from '../PublicQrCodeShare/PublicQrCodeShare';
import { encryptObject, getSession } from '../../../Services/Others';
import { PublicQrCodepost } from '../../../Features/ConfigMasterPage/ConfigMasterPage';
import Buttons from '../../../Components/Forms/Buttons';
import { changeBreadCrumb } from '../../../Features/AppPage/CenterPage';
import { Modal } from 'antd';
import { jsPDF } from 'jspdf';
import {
  FaFacebookF,
  FaWhatsapp,
  FaTwitter,
  FaLinkedinIn,
  FaEnvelope,
} from 'react-icons/fa';
import QRCodeLib from 'qrcode';
import { LuDownload } from 'react-icons/lu';
import { BsFileEarmarkPdf } from 'react-icons/bs';

const subDirectory = import.meta.env.ENV_MAIN_BASE_URL || '/';

const MenuQRCode = () => {
  const dispatch = useDispatch();

  // Session
  const CompId = getSession('CompId');
  const BranchId = getSession('BranchId');
  const AppId = getSession('AppId');
  const UserId = getSession('UserId');

  // States
  const [qrCodeUrl, setQrCodeUrl] = useState('');
  const [qrCodeDataUrl, setQrCodeDataUrl] = useState('');
  const [messageType, setMessageType] = useState(null);
  const [messageData, setMessageData] = useState(null);

  const [isPreviewModalOpen, setIsPreviewModalOpen] = useState(false);
  const [pdfPreviewUrl, setPdfPreviewUrl] = useState('');
  const [socialIconsDataUrls, setSocialIconsDataUrls] = useState([]);

  const cardRef = useRef(null);
  const socialIconsRef = useRef(null);

  // breadcrumb
  useEffect(() => {
    const items = [
      {
        name: 'Home',
        link: `${subDirectory}app-page/home`,
      },
    ];
    dispatch(changeBreadCrumb({ items }));
    HandleSubmit();
  }, [dispatch]);

  // Generate QR Code as Data URL using qrcode library
  useEffect(() => {
    if (qrCodeUrl) {
      QRCodeLib.toDataURL(qrCodeUrl, {
        width: 200,
        margin: 1,
        color: {
          dark: '#000000',
          light: '#FFFFFF',
        },
      })
        .then((url) => {
          setQrCodeDataUrl(url);
        })
        .catch((err) => {
          console.error('QR generation error:', err);
        });
    }
  }, [qrCodeUrl]);

  // Convert social icons to images
  useEffect(() => {
    if (qrCodeUrl && socialIconsRef.current) {
      const convertIconsToImages = async () => {
        try {
          const icons = socialIconsRef.current.querySelectorAll(
            '.social-icon-container'
          );
          const dataUrls = [];

          for (let icon of icons) {
            const svg = icon.querySelector('svg');
            if (svg) {
              const svgData = new XMLSerializer().serializeToString(svg);
              const canvas = document.createElement('canvas');
              const ctx = canvas.getContext('2d');
              const img = new Image();

              canvas.width = 16;
              canvas.height = 16;

              await new Promise((resolve) => {
                img.onload = () => {
                  ctx.fillStyle = '#0f1724';
                  ctx.fillRect(0, 0, canvas.width, canvas.height);
                  ctx.globalCompositeOperation = 'destination-in';
                  ctx.drawImage(img, 0, 0, 16, 16);
                  const dataUrl = canvas.toDataURL('image/png');
                  dataUrls.push(dataUrl);
                  resolve();
                };
                img.src =
                  'data:image/svg+xml;base64,' +
                  btoa(unescape(encodeURIComponent(svgData)));
              });
            }
          }

          setSocialIconsDataUrls(dataUrls);
        } catch (err) {
          console.error('Icon conversion error:', err);
        }
      };

      setTimeout(convertIconsToImages, 100);
    }
  }, [qrCodeUrl]);

  const HandleSubmit = async () => {
    try {
      let data = { BranchId, CompId, AppId, UserId };
      const encrypted = encryptObject(data);
      const postData = { Url: encrypted, CreatedBy: UserId };

      const res = await dispatch(PublicQrCodepost(postData)).unwrap();

      if (res?.data?.statusCode === 1) {
        const QrUrl = `${subDirectory}MenuQRCode?code=${res?.data?.ReferenceNo}`;
        setQrCodeUrl(QrUrl);
        setMessageType('success');
        setMessageData('QR Code generated.');
      } else {
        setMessageType('error');
        setMessageData(res?.data?.message || 'Failed to generate QR.');
      }
    } catch (error) {
      console.error('HandleSubmit Error:', error);
      setMessageType('error');
      setMessageData('An unexpected error occurred.');
    }
  };

  const onComplete = useCallback(() => {
    setMessageData(null);
    setMessageType(null);
  }, []);

  // const clearData = () => {
  //     setQrCodeUrl("");
  //     setQrCodeDataUrl("");
  //     setTableId(null);
  //     if (pdfPreviewUrl) {
  //         URL.revokeObjectURL(pdfPreviewUrl);
  //         setPdfPreviewUrl("");
  //     }
  // };

  const generatePdfFromCard = async (openPreview = true) => {
    try {
      if (!qrCodeDataUrl || socialIconsDataUrls.length < 4) {
        setMessageType('error');
        setMessageData('QR Code and icons not ready. Please wait a moment.');
        return;
      }

      const pdf = new jsPDF({
        orientation: 'portrait',
        unit: 'pt',
        format: 'a4',
      });

      const pageWidth = pdf.internal.pageSize.getWidth();
      const pageHeight = pdf.internal.pageSize.getHeight();

      // Card dimensions
      const cardWidth = 350;
      const cardX = (pageWidth - cardWidth) / 2;
      let yPos = 80;

      // Background card
      pdf.setFillColor(255, 255, 255);
      pdf.roundedRect(cardX, yPos, cardWidth, 500, 8, 8, 'F');

      // Shadow effect
      pdf.setDrawColor(0, 0, 0);
      pdf.setLineWidth(0.5);
      pdf.setGState(pdf.GState({ opacity: 0.1 }));
      pdf.roundedRect(cardX, yPos, cardWidth, 500, 8, 8, 'S');
      pdf.setGState(pdf.GState({ opacity: 1 }));

      yPos += 40;

      // Title
      pdf.setFontSize(16);
      pdf.setFont('helvetica', 'bold');
      pdf.setTextColor(15, 23, 36);
      pdf.text('Scan the QR Code', pageWidth / 2, yPos, { align: 'center' });

      yPos += 40;

      // QR Code background frame
      const qrSize = 200;
      const qrX = (pageWidth - qrSize) / 2;

      // Outer decorative frame
      pdf.setFillColor(255, 255, 255);
      pdf.roundedRect(
        qrX - 20,
        yPos - 20,
        qrSize + 40,
        qrSize + 40,
        12,
        12,
        'F'
      );

      // Shadow for QR frame
      pdf.setDrawColor(0, 0, 0);
      pdf.setGState(pdf.GState({ opacity: 0.06 }));
      pdf.roundedRect(
        qrX - 20,
        yPos - 20,
        qrSize + 40,
        qrSize + 40,
        12,
        12,
        'S'
      );
      pdf.setGState(pdf.GState({ opacity: 1 }));

      // Inner white background for QR
      pdf.setFillColor(255, 255, 255);
      pdf.roundedRect(qrX - 8, yPos - 8, qrSize + 16, qrSize + 16, 8, 8, 'F');

      // Add QR Code image
      pdf.addImage(qrCodeDataUrl, 'PNG', qrX, yPos, qrSize, qrSize);

      yPos += qrSize + 40;

      // MENU button
      const buttonWidth = 120;
      const buttonHeight = 45;
      const buttonX = (pageWidth - buttonWidth) / 2;

      pdf.setFillColor(15, 107, 117);
      pdf.roundedRect(buttonX, yPos, buttonWidth, buttonHeight, 8, 8, 'F');

      pdf.setFontSize(22);
      pdf.setFont('helvetica', 'bold');
      pdf.setTextColor(255, 255, 255);
      pdf.text('MENU', pageWidth / 2, yPos + 30, { align: 'center' });

      yPos += buttonHeight + 30;

      // Social icons with actual images
      const iconSize = 36;
      const iconSpacing = 18;
      const totalIconsWidth = iconSize * 4 + iconSpacing * 3;
      let iconX = (pageWidth - totalIconsWidth) / 2;

      pdf.setFillColor(255, 255, 255);
      pdf.setDrawColor(230, 238, 240);
      pdf.setLineWidth(1);

      socialIconsDataUrls.forEach((iconDataUrl) => {
        // Draw circle background
        pdf.circle(iconX + iconSize / 2, yPos, iconSize / 2, 'FD');

        // Draw icon image centered in circle
        const iconImageSize = 16;
        const iconImageX = iconX + (iconSize - iconImageSize) / 2;
        const iconImageY = yPos - iconImageSize / 2;
        pdf.addImage(
          iconDataUrl,
          'PNG',
          iconImageX,
          iconImageY,
          iconImageSize,
          iconImageSize
        );

        iconX += iconSize + iconSpacing;
      });

      yPos += 50;

      // URL text at bottom
      pdf.setFontSize(10);
      pdf.setTextColor(156, 163, 175);
      const urlText =
        qrCodeUrl.length > 50 ? qrCodeUrl.substring(0, 47) + '...' : qrCodeUrl;
      pdf.text(urlText, pageWidth / 2, yPos, { align: 'center' });

      // Create blob for preview
      const pdfBlob = pdf.output('blob');
      const blobUrl = URL.createObjectURL(pdfBlob);

      if (pdfPreviewUrl) {
        URL.revokeObjectURL(pdfPreviewUrl);
      }

      setPdfPreviewUrl(blobUrl);

      if (openPreview) {
        setIsPreviewModalOpen(true);
      } else {
        pdf.save('menu-qr.pdf');
      }
    } catch (err) {
      console.error('PDF generation failed', err);
      setMessageType('error');
      setMessageData('Failed to generate PDF.');
    }
  };

  const downloadPreviewPdf = () => {
    if (!pdfPreviewUrl) return;
    fetch(pdfPreviewUrl)
      .then((r) => r.blob())
      .then((blob) => {
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = 'menu-qr.pdf';
        document.body.appendChild(a);
        a.click();
        a.remove();
        URL.revokeObjectURL(url);
      });
  };

  return (
    <div className="userPageTable">
      <div className="userPageContent">
        <Messages
          messageType={messageType}
          messageData={messageData}
          onComplete={onComplete}
        />

        <div className="formAddNew">
          <FormHeader title={'Menu QR Code Generator'} />
        </div>

        <div className="reportTables">
          {qrCodeUrl && (
            <div
              ref={socialIconsRef}
              style={{ position: 'absolute', left: '-9999px' }}
            >
              <div className="social-icon-container">
                <FaFacebookF size={16} color="#0f1724" />
              </div>
              <div className="social-icon-container">
                <FaWhatsapp size={16} color="#0f1724" />
              </div>
              <div className="social-icon-container">
                <FaEnvelope size={16} color="#0f1724" />
              </div>
              <div className="social-icon-container">
                <FaLinkedinIn size={16} color="#0f1724" />
              </div>
            </div>
          )}

          {/* Card Display */}
          {qrCodeUrl && qrCodeDataUrl && (
            <div
              ref={cardRef}
              id="qr-export-card"
              style={{
                width: 420,
                margin: '0 auto',
                padding: 16,
                background: '#fff',
                borderRadius: 12,
                boxShadow: '0 6px 18px rgba(0,0,0,0.08)',
                textAlign: 'center',
                color: '#0f1724',
                border: '1px solid grey',
              }}
            >
              <h3
                style={{
                  fontSize: 16,
                  marginBottom: 0,
                  fontWeight: 500,
                  fontFamily: 'Poppins',
                }}
              >
                Scan the QR Code
              </h3>

              {/* QR with decorative rounded frame */}
              <div
                style={{
                  display: 'inline-block',
                  padding: 18,
                  background: '#fff',
                  borderRadius: 18,
                  boxShadow: '0 2px 10px rgba(0,0,0,0.06)',
                  position: 'relative',
                }}
              >
                <div
                  style={{
                    position: 'absolute',
                    inset: 6,
                    borderRadius: 18,
                    border: '6px solid transparent',
                    boxShadow: '0 0 0 6px #ffffff inset',
                    pointerEvents: 'none',
                  }}
                />
                <div
                  style={{ background: '#fff', padding: 6, borderRadius: 12 }}
                >
                  <img
                    src={qrCodeDataUrl}
                    alt="QR Code"
                    width={200}
                    height={200}
                    style={{ display: 'block', imageRendering: 'crisp-edges' }}
                  />
                </div>
              </div>

              <p
                style={{
                  marginTop: 18,
                  color: '#67696d',
                  fontSize: 12,
                  wordBreak: 'break-all',
                }}
              >
                {qrCodeUrl}
              </p>
            </div>
          )}

          {qrCodeUrl && <PublicQrCodeShare qrCodeUrl={qrCodeUrl} />}
          <div
            style={{
              display: 'flex',
              gap: 12,
              justifyContent: 'center',
              marginTop: 8,
            }}
          >
            {/* {qrCodeUrl && (
                            <Buttons buttonText="Generate QR" className="primary_Button" handleSubmit={HandleSubmit}>
                                Generate
                            </Buttons>
                        )} */}

            {qrCodeUrl && (
              <>
                <Buttons
                  buttonText="Preview PDF"
                  className="primary_Button"
                  handleSubmit={() => generatePdfFromCard(true)}
                  disabled={!qrCodeDataUrl}
                  icon={<BsFileEarmarkPdf size={20} />}
                >
                  Preview PDF
                </Buttons>

                <Buttons
                  buttonText="Download PDF"
                  className="primary_Button"
                  handleSubmit={() => generatePdfFromCard(false)}
                  disabled={!qrCodeDataUrl}
                  icon={<LuDownload size={20} />}
                >
                  Download PDF
                </Buttons>
              </>
            )}
          </div>
        </div>

        {/* Modal PDF Preview */}
        <Modal
          title="PDF Preview"
          open={isPreviewModalOpen}
          onCancel={() => {
            setIsPreviewModalOpen(false);
          }}
          footer={[
            <Buttons
              key="download"
              buttonText="Download"
              className="primary_Button"
              handleSubmit={downloadPreviewPdf}
            >
              Download
            </Buttons>,
            <Buttons
              key="close"
              buttonText="Close"
              className="secondary_Button"
              handleSubmit={() => setIsPreviewModalOpen(false)}
            >
              Close
            </Buttons>,
          ]}
          width={900}
          style={{ top: 20 }}
        >
          {pdfPreviewUrl ? (
            <div style={{ textAlign: 'center' }}>
              <iframe
                src={pdfPreviewUrl}
                width="100%"
                height="600px"
                style={{ border: 'none', borderRadius: 4 }}
                title="PDF Preview"
              />
            </div>
          ) : (
            <div style={{ textAlign: 'center', padding: 40 }}>
              Preparing preview...
            </div>
          )}
        </Modal>
      </div>
    </div>
  );
};
export default MenuQRCode;