import React, { useState, useEffect } from 'react';
import { Minimize2, Maximize2, Globe, ExternalLink, FileText, File, Download } from 'lucide-react';
import { axiosInstance } from '../../../services/axios';
import type { Asset } from '../../../types/assets';
import type { User } from '../../../types/auth';
import Modal from '../../../components/ui/Modal';
import Button from '../../../components/ui/Button';
import MarkdownViewer from '../../../components/ui/MarkdownViewer';
import * as XLSX from 'xlsx';

interface AssetViewerModalProps {
  isOpen: boolean;
  onClose: () => void;
  asset: Asset | null;
  user: User | null;
  onDownload: (asset: Asset) => void;
}

export const AssetViewerModal: React.FC<AssetViewerModalProps> = ({
  isOpen,
  onClose,
  asset,
  user,
  onDownload
}) => {
  const [isMaximized, setIsMaximized] = useState(false);
  const [isLoadingText, setIsLoadingText] = useState(false);
  const [textPreviewContent, setTextPreviewContent] = useState('');
  const [docBlob, setDocBlob] = useState<ArrayBuffer | null>(null);
  const [excelHtml, setExcelHtml] = useState<string>('');
  const [isLoadingDoc, setIsLoadingDoc] = useState(false);
  const [docLoadError, setDocLoadError] = useState(false);
  const wordContainerRef = React.useRef<HTMLDivElement>(null);

  const getFullAssetUrl = (url: string) => {
    let resolvedUrl = url;
    if (!url.startsWith('http')) {
      const backendBase = axiosInstance.defaults.baseURL || '/api/v1';
      const relativeHost = backendBase.replace('/api/v1', '');
      resolvedUrl = relativeHost.startsWith('/') || relativeHost === ''
        ? `${window.location.origin}${relativeHost}${url}`
        : `${relativeHost}${url}`;
    }

    // If current origin is a public domain (like ngrok) but the resolved URL is local,
    // rewrite the local URL host to match the public origin so that external viewers can fetch it.
    const currentOrigin = window.location.origin;
    const isCurrentOriginLocal = currentOrigin.includes('localhost') || currentOrigin.includes('127.0.0.1');
    if (!isCurrentOriginLocal && (resolvedUrl.includes('localhost') || resolvedUrl.includes('127.0.0.1'))) {
      resolvedUrl = resolvedUrl.replace(/https?:\/\/(localhost|127\.0\.0\.1)(:\d+)?/, currentOrigin);
    }

    return resolvedUrl;
  };

  const isLocalUrl = (url: string) => {
    const resolved = getFullAssetUrl(url);
    return (
      resolved.includes('localhost') || 
      resolved.includes('127.0.0.1') ||
      resolved.includes('ngrok-free.dev') ||
      resolved.includes('ngrok.io')
    );
  };

  const getGithubRawUrl = (url: string) => {
    let raw = url.trim();
    if (raw.endsWith('.git')) {
      raw = raw.slice(0, -4);
    }
    if (raw.endsWith('/')) {
      raw = raw.slice(0, -1);
    }

    if (raw.includes('/blob/')) {
      return raw.replace('github.com', 'raw.githubusercontent.com').replace('/blob/', '/');
    }

    const match = raw.match(/github\.com\/([^/]+)\/([^/]+)/);
    if (match && match[1] && match[2]) {
      const owner = match[1];
      const repo = match[2];
      return {
        owner,
        repo,
        mainUrl: `https://raw.githubusercontent.com/${owner}/${repo}/main/README.md`,
        masterUrl: `https://raw.githubusercontent.com/${owner}/${repo}/master/README.md`,
      };
    }
    return null;
  };

  const isTextOrCodeAsset = (url: string, type: string) => {
    const assetUrl = url.toLowerCase();
    return (
      assetUrl.endsWith('.md') ||
      assetUrl.endsWith('.txt') ||
      assetUrl.endsWith('.json') ||
      assetUrl.endsWith('.js') ||
      assetUrl.endsWith('.ts') ||
      assetUrl.endsWith('.tsx') ||
      assetUrl.endsWith('.jsx') ||
      assetUrl.endsWith('.py') ||
      assetUrl.endsWith('.yaml') ||
      assetUrl.endsWith('.yml') ||
      assetUrl.endsWith('.css') ||
      assetUrl.endsWith('.html') ||
      assetUrl.endsWith('.sh') ||
      type.includes('text') ||
      type.includes('markdown') ||
      type.includes('json') ||
      type.includes('javascript')
    );
  };

  const isAudioAsset = (url: string, type: string) => {
    const assetUrl = url.toLowerCase();
    return (
      assetUrl.endsWith('.mp3') ||
      assetUrl.endsWith('.wav') ||
      assetUrl.endsWith('.ogg') ||
      assetUrl.endsWith('.m4a') ||
      assetUrl.endsWith('.webm') ||
      type.includes('audio/')
    );
  };

  const isVideoAsset = (url: string, type: string) => {
    const assetUrl = url.toLowerCase();
    return (
      assetUrl.endsWith('.mp4') ||
      assetUrl.endsWith('.webm') ||
      assetUrl.endsWith('.ogg') ||
      assetUrl.endsWith('.mov') ||
      type.includes('video/')
    );
  };

  const isWord = asset ? (asset.type.includes('word') || asset.url.toLowerCase().endsWith('.docx') || asset.url.toLowerCase().endsWith('.doc')) : false;
  const isSpreadsheet = asset ? (asset.type.includes('sheet') || asset.url.toLowerCase().endsWith('.xlsx') || asset.url.toLowerCase().endsWith('.xls') || asset.url.toLowerCase().endsWith('.csv')) : false;

  useEffect(() => {
    if (isOpen && asset) {
      setTextPreviewContent('');
      setIsLoadingText(false);
      setDocBlob(null);
      setExcelHtml('');
      setIsLoadingDoc(false);
      setDocLoadError(false);
      
      if (
        asset.type !== 'url' &&
        isTextOrCodeAsset(asset.url, asset.type)
      ) {
        setIsLoadingText(true);
        axiosInstance.get(getFullAssetUrl(asset.url), { responseType: 'text' })
          .then(res => {
            setTextPreviewContent(res.data);
            setIsLoadingText(false);
          })
          .catch(err => {
            console.error(err);
            setTextPreviewContent('Failed to load text preview.');
            setIsLoadingText(false);
          });
      } 
      else if (asset.type === 'url' && asset.url.includes('github.com')) {
        const ghInfo = getGithubRawUrl(asset.url);
        if (ghInfo) {
          setIsLoadingText(true);
          const targetUrl = typeof ghInfo === 'string' ? ghInfo : ghInfo.mainUrl;
          
          fetch(targetUrl)
            .then(async (res) => {
              if (!res.ok && typeof ghInfo !== 'string') {
                const fallbackRes = await fetch(ghInfo.masterUrl);
                if (fallbackRes.ok) {
                  return fallbackRes.text();
                }
                throw new Error('README not found');
              }
              return res.text();
            })
            .then(data => {
              setTextPreviewContent(data);
              setIsLoadingText(false);
            })
            .catch(err => {
              console.error(err);
              setTextPreviewContent(`### GitHub Repository: ${typeof ghInfo === 'string' ? asset.url : `${ghInfo.owner}/${ghInfo.repo}`}\n\nCould not fetch README.md automatically. The repository might be private or not contain a README.md file.`);
              setIsLoadingText(false);
            });
        }
      }
      else if (isWord || isSpreadsheet) {
        setIsLoadingDoc(true);
        axiosInstance.get(getFullAssetUrl(asset.url), { responseType: 'arraybuffer' })
          .then(res => {
            const data = res.data;
            setDocBlob(data);
            
            if (isSpreadsheet) {
              try {
                const workbook = XLSX.read(data, { type: 'array' });
                const sheetName = workbook.SheetNames[0];
                const worksheet = workbook.Sheets[sheetName];
                const html = XLSX.utils.sheet_to_html(worksheet, { header: '', footer: '' });
                setExcelHtml(html);
              } catch (err) {
                console.error("SheetJS Parsing error", err);
                setDocLoadError(true);
              }
            }
            setIsLoadingDoc(false);
          })
          .catch(err => {
            console.error(err);
            setDocLoadError(true);
            setIsLoadingDoc(false);
          });
      }
    }
  }, [isOpen, asset]);

  useEffect(() => {
    if (isWord && docBlob && wordContainerRef.current) {
      wordContainerRef.current.innerHTML = '';
      import('docx-preview').then(({ renderAsync }) => {
        renderAsync(docBlob, wordContainerRef.current!)
          .catch(err => {
            console.error("Docx Preview error:", err);
            wordContainerRef.current!.innerHTML = '<div class="p-4 text-red-550 font-sans">Failed to render Word document preview. Please download the file to inspect.</div>';
          });
      });
    }
  }, [docBlob, isWord]);

  const formatBytes = (bytes: number, decimals = 2) => {
    if (bytes === 0) return '0 Bytes';
    const k = 1024;
    const dm = decimals < 0 ? 0 : decimals;
    const sizes = ['Bytes', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
  };

  const handleClose = () => {
    setIsMaximized(false);
    onClose();
  };

  return (
    <Modal
      isOpen={isOpen && !!asset}
      onClose={handleClose}
      title={
        <div className="flex items-center justify-between w-full">
          <div className="text-left">
            <span className="text-base font-bold text-ink-900 block font-sans">{asset?.title}</span>
            <span className="text-xs text-ink-500 font-sans block mt-0.5 font-normal">
              {asset?.type === 'url' ? 'External Web Link' : `${asset?.type} • ${asset ? formatBytes(asset.size) : ''}`}
            </span>
          </div>
          <button 
            onClick={() => setIsMaximized(!isMaximized)}
            className="p-1.5 rounded-lg text-ink-400 hover:text-ink-900 hover:bg-ink-50 transition-colors ml-4 cursor-pointer inline-flex items-center"
            title={isMaximized ? "Collapse view" : "Expand view"}
          >
            {isMaximized ? <Minimize2 className="w-4 h-4" /> : <Maximize2 className="w-4 h-4" />}
          </button>
        </div>
      }
      size="full"
      className={isMaximized ? '!max-w-[96vw] !max-h-[92vh] !h-[92vh] !mt-4' : '!max-w-[85vw] md:!max-w-[80vw] xl:!max-w-[75vw] !h-[75vh] !max-h-[75vh] !w-full'}
      footer={
        <>
          <Button
            onClick={handleClose}
            variant="ghost"
            size="sm"
          >
            Close Preview
          </Button>
          
          {asset && (user?.role === 'ADMIN' || asset.isDownloadable || asset.downloadRequests?.[0]?.status === 'APPROVED') && (
            <Button
              onClick={() => {
                const url = getFullAssetUrl(asset.url);
                const isOffice = asset.type.includes('word') || asset.type.includes('presentation') || asset.type.includes('sheet') || 
                                 asset.url.toLowerCase().endsWith('.docx') || asset.url.toLowerCase().endsWith('.doc') || 
                                 asset.url.toLowerCase().endsWith('.pptx') || asset.url.toLowerCase().endsWith('.ppt') || 
                                 asset.url.toLowerCase().endsWith('.xlsx') || asset.url.toLowerCase().endsWith('.xls');
                
                if (isOffice && !isLocalUrl(asset.url)) {
                  window.open(`https://view.officeapps.live.com/op/view.aspx?src=${encodeURIComponent(url)}`, '_blank');
                } else {
                  window.open(url, '_blank');
                }
              }}
              variant="secondary"
              size="sm"
              className="flex items-center gap-2"
            >
              <ExternalLink className="w-4 h-4" />
              <span>Open in New Tab</span>
            </Button>
          )}

          {asset && asset.type !== 'url' && (user?.role === 'ADMIN' || asset.isDownloadable || asset.downloadRequests?.[0]?.status === 'APPROVED') && (
            <Button
              onClick={() => onDownload(asset)}
              variant="primary"
              size="sm"
              className="flex items-center gap-2"
            >
              <Download className="w-4 h-4" />
              <span>Download File</span>
            </Button>
          )}
        </>
      }
    >
      {asset && (
        <div className="flex-1 w-full bg-ink-50 rounded-xl flex flex-col items-center justify-center overflow-hidden border border-ink-200 min-h-0 h-full">
          {asset.type === 'url' && asset.url.includes('github.com') ? (
            <div className="w-full h-full flex flex-col min-h-0 bg-ink-0">
              <div className="bg-ink-100 px-4 py-2 border-b border-ink-200 flex justify-between items-center text-xs text-ink-600 font-bold select-none">
                <span className="flex items-center gap-1.5">
                  <Globe className="w-4 h-4 text-ink-950" />
                  <span className="font-sans">Embedded GitHub Document</span>
                </span>
              </div>
              <div className="flex-1 overflow-auto p-6 text-left select-text bg-ink-0 text-ink-800 font-sans leading-relaxed">
                {isLoadingText ? (
                  <div className="flex flex-col items-center justify-center h-full space-y-3">
                    <div className="w-6 h-6 rounded-full border-4 border-ink-900 border-t-transparent animate-spin" />
                    <span className="text-xs text-ink-500 font-medium font-sans">Fetching README.md...</span>
                  </div>
                ) : (
                  <div className="max-w-3xl mx-auto space-y-4">
                    <div className="border-b border-ink-200 pb-4 mb-6">
                      <h1 className="text-xl font-extrabold text-ink-950 font-sans">{asset.title}</h1>
                      <p className="text-xs text-ink-500 mt-1 font-mono">{asset.url}</p>
                    </div>
                    <MarkdownViewer markdown={textPreviewContent} />
                  </div>
                )}
              </div>
            </div>
          ) : asset.type === 'url' ? (
            <div className="w-full h-full flex flex-col min-h-0 bg-ink-0">
              <div className="bg-ink-100 px-4 py-2 border-b border-ink-200 flex justify-between items-center text-xs text-ink-600 font-bold select-none shrink-0">
                <span className="flex items-center gap-1.5">
                  <Globe className="w-4 h-4 text-ink-950" />
                  <span className="font-sans">External Web Link Portal Guide</span>
                </span>
                <span className="text-[10px] text-ink-400 font-mono font-normal truncate max-w-xs">{asset.url}</span>
              </div>
              
              <div className="flex-1 overflow-auto p-4 md:p-8 flex flex-col md:flex-row items-center justify-center gap-8 bg-ink-50">
                {/* Visual Section: Browser Mockup */}
                <div className="w-full max-w-md aspect-video md:aspect-[4/3] rounded-2xl overflow-hidden shadow-lg border border-ink-200 bg-slate-900 flex flex-col shrink-0">
                  {/* Browser Header Bar */}
                  <div className="h-7 bg-slate-800 border-b border-slate-700/60 flex items-center px-4 gap-2 shrink-0 select-none">
                    <div className="flex gap-1.5 shrink-0">
                      <span className="w-3 h-3 rounded-full bg-red-500/80" />
                      <span className="w-3 h-3 rounded-full bg-yellow-500/80" />
                      <span className="w-3 h-3 rounded-full bg-green-500/80" />
                    </div>
                    <div className="flex-1 max-w-[200px] mx-auto bg-slate-900/60 border border-slate-700/30 rounded-md px-3 py-0.5 flex items-center gap-1.5 text-[10px] text-slate-400 font-mono select-none truncate">
                      <Globe className="w-3 h-3 text-slate-500 shrink-0" />
                      <span className="truncate">{(() => {
                        try {
                          return new URL(asset.url).hostname.replace('www.', '');
                        } catch {
                          return 'website.com';
                        }
                      })()}</span>
                    </div>
                  </div>
                  
                  {/* Browser Content */}
                  <div className="flex-1 bg-gradient-to-tr from-slate-950 via-slate-900 to-indigo-950 p-6 flex flex-col justify-between relative overflow-hidden">
                    <div className="absolute inset-0 bg-[linear-gradient(to_right,#80808008_1px,transparent_1px),linear-gradient(to_bottom,#80808008_1px,transparent_1px)] bg-[size:16px_16px]" />
                    
                    <div className="space-y-3 relative z-10 text-left">
                      <div className="flex justify-between items-center bg-white/[0.02] border border-white/5 rounded-lg px-3 py-1.5">
                        <div className="w-16 h-2 bg-indigo-400/40 rounded" />
                        <div className="flex gap-1.5">
                          <div className="w-6 h-1.5 bg-white/20 rounded" />
                          <div className="w-6 h-1.5 bg-white/20 rounded" />
                        </div>
                      </div>
                      
                      <div className="space-y-2 pt-2">
                        <div className="h-5 bg-gradient-to-r from-indigo-400 to-cyan-400 rounded-lg w-5/6" />
                        <div className="h-2 bg-white/20 rounded w-11/12" />
                        <div className="h-2 bg-white/15 rounded w-3/4" />
                      </div>
                    </div>

                    <div className="relative z-10 bg-slate-900/80 border border-slate-800/80 rounded-xl p-3.5 flex items-center gap-3 select-none">
                      <div className="w-10 h-10 rounded-lg bg-indigo-650 flex items-center justify-center text-sm font-black text-white shrink-0 shadow-md shadow-indigo-600/20">
                        {(() => {
                          try {
                            return new URL(asset.url).hostname.replace('www.', '').charAt(0).toUpperCase();
                          } catch {
                            return 'W';
                          }
                        })()}
                      </div>
                      <div className="flex-1 min-w-0 text-left">
                        <div className="text-xs font-bold text-white font-mono truncate leading-none">
                          {(() => {
                            try {
                              return new URL(asset.url).hostname.replace('www.', '');
                            } catch {
                              return 'website.com';
                            }
                          })()}
                        </div>
                        <div className="text-[8px] text-slate-500 font-mono mt-1 leading-none tracking-wider">
                          SECURE PORTAL LINK
                        </div>
                      </div>
                    </div>
                  </div>
                </div>

                {/* Info & Guide Section */}
                <div className="flex-1 bg-ink-0 border border-ink-200 rounded-2xl p-6 md:p-8 shadow-lg max-w-lg w-full flex flex-col justify-between min-h-[350px]">
                  <div className="space-y-4 text-left">
                    <div>
                      <span className="inline-flex px-2 py-0.5 rounded text-[9px] font-extrabold uppercase tracking-wider text-indigo-650 bg-indigo-50 border border-indigo-100">
                        External Portal Link
                      </span>
                      <h3 className="text-lg font-extrabold text-ink-950 font-sans leading-snug mt-1.5">{asset.title}</h3>
                      {asset.description ? (
                        <p className="text-xs text-ink-500 font-sans mt-2 leading-relaxed">{asset.description}</p>
                      ) : (
                        <p className="text-xs text-ink-400 font-sans mt-2 italic">No description provided for this external portal link.</p>
                      )}
                    </div>

                    {/* Step-by-Step Access Guide */}
                    <div className="bg-ink-50 border border-ink-200 rounded-xl p-4 space-y-3">
                      <span className="text-[9px] font-bold uppercase tracking-wider text-ink-400 block">Access Guide</span>
                      <ul className="space-y-2 text-xs text-ink-700 leading-relaxed font-sans">
                        <li className="flex items-start gap-2">
                          <span className="w-4 h-4 rounded-full bg-ink-200 text-ink-800 text-[10px] font-bold flex items-center justify-center shrink-0 mt-0.5">1</span>
                          <span>Click the primary button below or select <strong>Open in New Tab</strong> from the footer to access this asset.</span>
                        </li>
                        <li className="flex items-start gap-2">
                          <span className="w-4 h-4 rounded-full bg-ink-200 text-ink-800 text-[10px] font-bold flex items-center justify-center shrink-0 mt-0.5">2</span>
                          <span>If the partner resource requires authorization, use your partner account credentials to sign in.</span>
                        </li>
                      </ul>
                    </div>
                  </div>

                  <div className="pt-6 border-t border-ink-100 w-full mt-4">
                    {(user?.role === 'ADMIN' || asset.isDownloadable || asset.downloadRequests?.[0]?.status === 'APPROVED') ? (
                      <div className="space-y-2 w-full">
                        <a
                          href={asset.url}
                          target="_blank"
                          rel="noopener noreferrer"
                          className="inline-flex items-center justify-center gap-2 px-6 py-2.5 rounded-xl bg-ink-900 text-ink-0 text-xs font-bold hover:bg-ink-850 transition-all hover:scale-[1.02] active:scale-95 shadow-md w-full font-sans cursor-pointer"
                        >
                          <span>Open Website in New Tab</span>
                          <ExternalLink className="w-4 h-4" />
                        </a>
                        <button
                          onClick={() => {
                            navigator.clipboard.writeText(asset.url);
                            alert('Link copied to clipboard!');
                          }}
                          className="w-full text-center text-xs font-bold text-ink-600 hover:text-ink-900 bg-ink-50 hover:bg-ink-100 border border-ink-200 py-2 rounded-xl transition-all cursor-pointer"
                        >
                          Copy Link Address
                        </button>
                      </div>
                    ) : (
                      <div className="bg-amber-50 border border-amber-200 text-amber-900 rounded-xl p-4 text-xs font-medium text-center font-sans">
                        Access Restricted: You must request and receive approval from the Administrator to open this external link.
                      </div>
                    )}
                  </div>
                </div>
              </div>
            </div>
          ) : asset.type.includes('pdf') ? (
            <div className="w-full h-full flex flex-col min-h-0">
              <div className="bg-ink-100 px-4 py-2 border-b border-ink-200 flex items-center text-xs text-ink-600 font-bold select-none">
                <FileText className="w-4 h-4 text-ink-950 mr-1.5" />
                <span className="font-sans">Interactive PDF Preview</span>
              </div>
              <iframe 
                src={getFullAssetUrl(asset.url)} 
                className="w-full flex-1 border-0 min-h-0"
                title={asset.title}
              />
            </div>
          ) : isTextOrCodeAsset(asset.url, asset.type) ? (
            <div className="w-full h-full flex flex-col min-h-0 bg-ink-0">
              <div className="bg-ink-100 px-4 py-2 border-b border-ink-200 flex items-center text-xs text-ink-600 font-bold select-none">
                <FileText className="w-4 h-4 text-ink-950 mr-1.5" />
                <span className="font-sans">Document Reader</span>
              </div>
              <div className="flex-1 overflow-auto p-6 text-left select-text bg-ink-0 text-ink-800 font-sans leading-relaxed">
                {isLoadingText ? (
                  <div className="flex flex-col items-center justify-center h-full space-y-3">
                    <div className="w-6 h-6 rounded-full border-4 border-ink-900 border-t-transparent animate-spin" />
                    <span className="text-xs text-ink-500 font-medium font-sans">Loading content...</span>
                  </div>
                ) : (
                  <div className="max-w-3xl mx-auto space-y-4">
                    <div className="border-b border-ink-200 pb-4 mb-6">
                      <h1 className="text-xl font-extrabold text-ink-950 font-sans">{asset.title}</h1>
                      <p className="text-xs text-ink-500 mt-1 font-sans">Plain Text / Source Code Format</p>
                    </div>
                    {asset.url.toLowerCase().endsWith('.md') || asset.type.includes('markdown') ? (
                      <MarkdownViewer markdown={textPreviewContent} />
                    ) : (
                      <pre className="whitespace-pre-wrap font-mono text-xs text-ink-800 bg-ink-50 border border-ink-200 rounded-lg p-4 break-words leading-relaxed overflow-x-auto">
                        {textPreviewContent}
                      </pre>
                    )}
                  </div>
                )}
              </div>
            </div>
          ) : isAudioAsset(asset.url, asset.type) ? (
            <div className="w-full h-full flex flex-col justify-center items-center bg-ink-0 p-8 space-y-4">
              <div className="w-16 h-16 rounded-full bg-ink-50 border border-ink-200 flex items-center justify-center text-ink-900 shadow-sm">
                <span className="text-2xl">🎵</span>
              </div>
              <div className="text-center max-w-sm">
                <h4 className="text-sm font-bold text-ink-900 font-sans">Audio Player</h4>
                <p className="text-xs text-ink-500 mt-1 font-sans">You can listen to this audio asset directly in the browser.</p>
              </div>
              <audio 
                src={getFullAssetUrl(asset.url)} 
                controls 
                className="w-full max-w-md mt-4 focus:outline-none"
              />
            </div>
          ) : isVideoAsset(asset.url, asset.type) ? (
            <div className="w-full h-full flex flex-col min-h-0 bg-ink-950">
              <div className="bg-ink-100 px-4 py-2 border-b border-ink-200 flex items-center text-xs text-ink-600 font-bold select-none w-full shrink-0">
                <FileText className="w-4 h-4 text-ink-950 mr-1.5" />
                <span className="font-sans text-ink-900">Video Player</span>
              </div>
              <div className="flex-1 flex items-center justify-center min-h-0 relative p-4">
                <video 
                  src={getFullAssetUrl(asset.url)} 
                  controls 
                  className="max-w-full max-h-full rounded-xl shadow-lg border border-ink-800"
                  style={{ outline: 'none' }}
                />
              </div>
            </div>
          ) : (isWord || isSpreadsheet || asset.type.includes('presentation') || asset.url.toLowerCase().endsWith('.pptx') || asset.url.toLowerCase().endsWith('.ppt')) ? (
            <div className="w-full h-full flex flex-col min-h-0 bg-ink-0">
              <div className="bg-ink-100 px-4 py-2 border-b border-ink-200 flex justify-between items-center text-xs text-ink-600 font-bold select-none shrink-0">
                <span className="flex items-center gap-1.5">
                  <FileText className="w-4 h-4 text-ink-950" />
                  <span className="font-sans">
                    {isWord ? 'Interactive Word Document Viewer' : isSpreadsheet ? 'Interactive Spreadsheet Grid Viewer' : 'Interactive Presentation Viewer'}
                  </span>
                </span>
                <span className="text-[10px] text-ink-400 font-mono font-normal truncate max-w-xs">{asset.title}</span>
              </div>
              
              {isLoadingDoc ? (
                <div className="flex-1 flex flex-col items-center justify-center space-y-3 bg-ink-50">
                  <div className="w-8 h-8 rounded-full border-4 border-ink-900 border-t-transparent animate-spin" />
                  <span className="text-xs text-ink-500 font-medium font-sans">Loading and rendering document...</span>
                </div>
              ) : docLoadError ? (
                <div className="flex-1 p-8 text-center flex flex-col justify-center items-center max-w-lg mx-auto space-y-4 bg-ink-0">
                  <div className="w-16 h-16 rounded-2xl bg-red-50 border border-red-100 flex items-center justify-center text-red-650 shadow-sm shrink-0">
                    <FileText className="w-8 h-8" />
                  </div>
                  <div>
                    <h4 className="text-sm font-bold text-red-950 font-sans">Failed to Render Document</h4>
                    <p className="text-xs text-slate-500 mt-2 leading-relaxed font-sans">
                      We encountered an error loading or rendering this document ({asset.type.split('/').pop()?.toUpperCase() || 'FILE'}).
                    </p>
                    <p className="text-xs text-slate-500 mt-2 leading-relaxed bg-slate-50 border border-slate-100 rounded-xl p-3 text-left font-sans">
                      Please download the asset directly to view it on your device.
                    </p>
                  </div>
                </div>
              ) : isSpreadsheet ? (
                <div className="flex-1 overflow-auto bg-slate-100 p-4 flex flex-col">
                  <div className="excel-preview-container flex-1 bg-white border border-slate-200 shadow-sm rounded-xl overflow-auto p-4">
                    <style>{`
                      .excel-preview-container table {
                        border-collapse: collapse;
                        width: max-content;
                        min-width: 100%;
                        font-size: 11px;
                        font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
                      }
                      .excel-preview-container th, .excel-preview-container td {
                        border: 1px solid #e2e8f0;
                        padding: 6px 12px;
                        text-align: left;
                        white-space: nowrap;
                      }
                      .excel-preview-container tr:nth-child(even) {
                        background-color: #f8fafc;
                      }
                      .excel-preview-container tr:hover {
                        background-color: #f1f5f9;
                      }
                    `}</style>
                    <div dangerouslySetInnerHTML={{ __html: excelHtml || '<div class="p-4 text-slate-400 font-sans italic">No data found in this spreadsheet.</div>' }} />
                  </div>
                </div>
              ) : isWord ? (
                <div className="flex-1 overflow-auto bg-slate-100 p-6 md:p-8 flex justify-center">
                  <div 
                    ref={wordContainerRef} 
                    className="w-full max-w-4xl bg-white shadow-md border border-slate-200 rounded-xl p-8 md:p-12 overflow-y-auto"
                    style={{ minHeight: '842px' }}
                  />
                </div>
              ) : (
                /* PowerPoint / Presentation */
                isLocalUrl(asset.url) ? (
                  <div className="flex-1 p-8 text-center flex flex-col justify-center items-center max-w-lg mx-auto space-y-4 bg-ink-0">
                    <div className="w-16 h-16 rounded-2xl bg-amber-50 border border-amber-200 flex items-center justify-center text-amber-950 shadow-sm shrink-0">
                      <FileText className="w-8 h-8" />
                    </div>
                    <div>
                      <h4 className="text-sm font-bold text-amber-950 font-sans">Presentation Slide Viewer</h4>
                      <p className="text-xs text-amber-900/80 mt-2 leading-relaxed font-sans">
                        This asset is a PowerPoint Presentation ({asset.type.split('/').pop()?.toUpperCase() || 'PPTX'}). 
                      </p>
                      <p className="text-xs text-slate-500 mt-2 leading-relaxed bg-slate-50 border border-slate-100 rounded-xl p-3 text-left font-sans">
                        <strong>Note:</strong> Microsoft Office Online Viewer is optimized for staging/production environments. In development (localhost or ngrok tunnel), external Microsoft services cannot fetch your local files. Please download this asset using the button below to view it locally.
                      </p>
                    </div>
                  </div>
                ) : (
                  <iframe 
                    src={`https://view.officeapps.live.com/op/embed.aspx?src=${encodeURIComponent(getFullAssetUrl(asset.url))}`} 
                    className="w-full flex-1 border-0 min-h-0"
                    title={asset.title}
                  />
                )
              )}
            </div>
          ) : asset.type.includes('image') || asset.type.includes('png') || asset.type.includes('jpg') ? (
            <div className="w-full h-full flex items-center justify-center p-4">
              <img 
                src={getFullAssetUrl(asset.url)} 
                alt={asset.title}
                className="max-w-full max-h-full object-contain rounded-xl shadow-sm border border-ink-100"
              />
            </div>
          ) : (
            <div className="text-center p-8 flex flex-col justify-center items-center">
              <File className="w-12 h-12 text-ink-300 mb-3" />
              <h4 className="text-sm font-bold text-ink-900 font-sans">Direct Preview Unsupported</h4>
              <p className="text-xs text-ink-500 mt-1 max-w-sm font-sans">
                This file format cannot be rendered directly in the browser. Please download the file to inspect its contents.
              </p>
            </div>
          )}
        </div>
      )}
    </Modal>
  );
};