add view de

management/src/components/ExamRoomWorkspace.tsx

@@ -1,4 +1,4 @@
-import React, { useCallback, useEffect, useState } from 'react';
+import React, { useCallback, useEffect, useRef, useState } from 'react';
 import {
   apiExam,
   staffFetch,
@@ -12,6 +12,7 @@ import { navigate, pushNav } from '../navigation';
 import { BASE_APP_SUGGESTIONS, DEFAULT_EXAM_ALLOWED_APPS } from '../constants';
 import { openStaffChat } from '../chatEvents';
 import { AppPoolModal } from './AppPoolModal';
+import { ExamPaperPdfModal } from './ExamPaperPdfModal';
 import { NavHistoryBar } from './NavHistoryBar';
 import { StudentAvatar } from './StudentAvatar';
 import { StudentDetailModal } from './StudentDetailModal';
@@ -83,6 +84,10 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
   const [activeSubTab, setActiveSubTab] = useState<'roster' | 'detail' | 'submissions'>('roster');
   const [configOpen, setConfigOpen] = useState(false);
   const [configTab, setConfigTab] = useState<'info' | 'apps' | 'papers'>('info');
+  const [papersModalOpen, setPapersModalOpen] = useState(false);
+  const [pdfViewer, setPdfViewer] = useState<{ title: string; bytes: Uint8Array | null } | null>(null);
+  const [pdfLoading, setPdfLoading] = useState(false);
+  const [inlineResource, setInlineResource] = useState<{ url: string; title: string; isImage: boolean } | null>(null);
 
   const load = useCallback(async () => {
     setLoading(true);
@@ -117,6 +122,25 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
 
   useEffect(() => { load().catch(console.error); }, [load]);
 
+  const closePdfViewer = useCallback(() => {
+    setPdfViewer(null);
+    setPdfLoading(false);
+  }, []);
+
+  const closeInlineResource = useCallback(() => {
+    setInlineResource((prev) => {
+      if (prev?.url) URL.revokeObjectURL(prev.url);
+      return null;
+    });
+  }, []);
+
+  const inlineResourceRef = useRef(inlineResource);
+  inlineResourceRef.current = inlineResource;
+
+  useEffect(() => () => {
+    if (inlineResourceRef.current?.url) URL.revokeObjectURL(inlineResourceRef.current.url);
+  }, []);
+
   const fetchOnline = useCallback(async () => {
     try {
       const res = await apiExam.fetchOnlineStudents(examId);
@@ -237,6 +261,64 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
     URL.revokeObjectURL(url);
   };
 
+  const viewPaperPdf = async (paperId: number, title?: string) => {
+    setErr('');
+    const paperTitle = title || papers.find((p) => p.id === paperId)?.title || 'Đề thi';
+    setPapersModalOpen(false);
+    setPdfLoading(true);
+    setPdfViewer({ title: paperTitle, bytes: null });
+    try {
+      const buf = await apiExam.fetchPaperPdfBytes(examId, paperId);
+      setPdfViewer({ title: paperTitle, bytes: new Uint8Array(buf) });
+    } catch (e: any) {
+      closePdfViewer();
+      setErr(e?.message || 'Không mở được đề PDF');
+    } finally {
+      setPdfLoading(false);
+    }
+  };
+
+  const viewPaperResource = async (paperId: number, resourceId: number, fileName: string) => {
+    setErr('');
+    if (/\.pdf$/i.test(fileName)) {
+      setPapersModalOpen(false);
+      setPdfLoading(true);
+      setPdfViewer({ title: fileName, bytes: null });
+      try {
+        const buf = await apiExam.fetchPaperResourceBytes(examId, paperId, resourceId);
+        setPdfViewer({ title: fileName, bytes: new Uint8Array(buf) });
+      } catch (e: any) {
+        closePdfViewer();
+        setErr(e?.message || 'Không mở được PDF');
+      } finally {
+        setPdfLoading(false);
+      }
+      return;
+    }
+    closeInlineResource();
+    try {
+      const buf = await apiExam.fetchPaperResourceBytes(examId, paperId, resourceId);
+      const isImage = /\.(png|jpe?g|gif|webp)$/i.test(fileName);
+      const mime = /\.png$/i.test(fileName) ? 'image/png'
+        : /\.jpe?g$/i.test(fileName) ? 'image/jpeg'
+        : /\.gif$/i.test(fileName) ? 'image/gif'
+        : 'image/webp';
+      const url = URL.createObjectURL(new Blob([buf], { type: mime }));
+      setInlineResource({ url, title: fileName, isImage });
+    } catch (e: any) {
+      setErr(e?.message || 'Không mở được tài nguyên');
+    }
+  };
+
+  const downloadPaperResource = async (paperId: number, resourceId: number, fileName: string) => {
+    setErr('');
+    try {
+      await apiExam.downloadPaperFile(examId, paperId, { resourceId, fileName });
+    } catch (e: any) {
+      setErr(e?.message || 'Không tải được tài nguyên');
+    }
+  };
+
   const downloadAllSubs = async () => {
     setErr(''); setMsg('');
     setBundlingSubs(true);
@@ -417,6 +499,11 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
               {canCancel && (
                 <button type="button" className="btn btn-secondary btn-sm learning-btn-danger" onClick={handleCancel}>Hủy</button>
               )}
+              {papers.length > 0 && (
+                <button type="button" className="btn btn-secondary btn-sm" onClick={() => setPapersModalOpen(true)}>
+                  📄 Xem đề
+                </button>
+              )}
             </div>
           </div>
 
@@ -610,9 +697,12 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                   <div style={{ display: 'flex', flexDirection: 'column', gap: '0.65rem' }}>
                     {papers.map((p) => (
                       <div key={p.id} style={{ border: '1px solid var(--border-light)', borderRadius: '8px', padding: '0.75rem', background: 'var(--bg-subtle)' }}>
-                        <div style={{ display: 'flex', justifyContent: 'space-between', gap: '0.5rem', alignItems: 'flex-start' }}>
+                        <div style={{ display: 'flex', justifyContent: 'space-between', gap: '0.5rem', alignItems: 'flex-start', flexWrap: 'wrap' }}>
                           <strong>{p.title}</strong>
-                          <span className="badge badge-muted">Gói đề</span>
+                          <div style={{ display: 'flex', gap: '0.35rem', alignItems: 'center' }}>
+                            <button type="button" className="btn btn-ghost btn-sm" onClick={() => viewPaperPdf(p.id)}>Xem PDF</button>
+                            <span className="badge badge-muted">Gói đề</span>
+                          </div>
                         </div>
                         <ul className="config-card-desc" style={{ margin: '0.5rem 0 0', paddingLeft: '1.1rem' }}>
                           <li>📄 main.pdf (đề chính)</li>
@@ -620,7 +710,12 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                             <li style={{ color: 'var(--text-muted)' }}>Chưa có tài nguyên kèm</li>
                           ) : (
                             (p.resources || []).map((r) => (
-                              <li key={r.id}>📎 {r.fileName}</li>
+                              <li key={r.id}>
+                                📎 {r.fileName}{' '}
+                                <button type="button" className="link-btn" onClick={() => downloadPaperResource(p.id, r.id, r.fileName)}>
+                                  Tải
+                                </button>
+                              </li>
                             ))
                           )}
                         </ul>
@@ -718,6 +813,11 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                     + Thêm sinh viên
                   </button>
                 )}
+                {papers.length > 0 && (
+                  <button type="button" className="btn btn-secondary btn-sm" onClick={() => setPapersModalOpen(true)}>
+                    📄 Xem đề ({papers.length})
+                  </button>
+                )}
               </div>
             </div>
             <div className="divider" style={{ opacity: 0.3, margin: '0.25rem 0' }} />
@@ -820,7 +920,19 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                               <td style={{ color: isOnline ? 'var(--success)' : 'var(--text-muted)', fontWeight: 700 }}>
                                 {isOnline ? 'Online' : 'Offline'}
                               </td>
-                              <td>{s.paperTitle || '—'}</td>
+                              <td>
+                                {s.paperTitle || '—'}
+                                {s.assignedPaperId && (
+                                  <button
+                                    type="button"
+                                    className="link-btn"
+                                    style={{ marginLeft: '0.35rem' }}
+                                    onClick={() => viewPaperPdf(s.assignedPaperId!)}
+                                  >
+                                    Xem đề
+                                  </button>
+                                )}
+                              </td>
                               <td>{s.paperSentAt ? fmtTime(s.paperSentAt) : s.paperScheduledAt ? `Hẹn ${fmtTime(s.paperScheduledAt)}` : '—'}</td>
                               <td>{s.submitted ? <span className="badge badge-success">Đã nộp</span> : '—'}</td>
                               <td style={{ textAlign: 'right', whiteSpace: 'nowrap' }}>
@@ -853,6 +965,15 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
               <div className="session-logs-panel">
                 {submissions.length > 0 && (
                   <div className="exam-submissions-toolbar">
+                    {papers.length > 0 && (
+                      <button
+                        type="button"
+                        className="btn btn-secondary btn-sm"
+                        onClick={() => setPapersModalOpen(true)}
+                      >
+                        📄 Xem đề phòng thi
+                      </button>
+                    )}
                     <button
                       type="button"
                       className="btn btn-primary btn-sm"
@@ -939,6 +1060,81 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
         </div>
       </div>
 
+      {pdfViewer && (
+        <ExamPaperPdfModal
+          title={pdfViewer.title}
+          bytes={pdfViewer.bytes}
+          loading={pdfLoading}
+          onClose={closePdfViewer}
+        />
+      )}
+
+      {inlineResource && (
+        <div className="modal-overlay exam-pdf-viewer-overlay" onClick={closeInlineResource}>
+          <div className="exam-pdf-viewer-modal exam-inline-resource-modal" onClick={(e) => e.stopPropagation()}>
+            <div className="modal-header exam-pdf-viewer-header">
+              <h2 className="modal-title">{inlineResource.title}</h2>
+              <button type="button" className="modal-close-btn" onClick={closeInlineResource} aria-label="Đóng">×</button>
+            </div>
+            <div className="exam-inline-resource-body">
+              {inlineResource.isImage ? (
+                <img src={inlineResource.url} alt={inlineResource.title} className="exam-inline-resource-image" />
+              ) : (
+                <iframe src={inlineResource.url} title={inlineResource.title} className="exam-pdf-viewer-frame" />
+              )}
+            </div>
+          </div>
+        </div>
+      )}
+
+      {papersModalOpen && (
+        <div className="modal-overlay" onClick={() => setPapersModalOpen(false)}>
+          <div className="modal-container exam-papers-view-modal" onClick={(e) => e.stopPropagation()}>
+            <div className="modal-header">
+              <div>
+                <h2 className="modal-title">Đề thi — {roomName}</h2>
+                <p className="exam-student-modal-desc">{papers.length} gói đề trong phòng thi</p>
+              </div>
+              <button type="button" className="modal-close-btn" onClick={() => setPapersModalOpen(false)} aria-label="Đóng">×</button>
+            </div>
+            <div className="exam-papers-view-body">
+              {papers.map((p) => (
+                <div key={p.id} className="exam-paper-view-card">
+                  <div className="exam-paper-view-head">
+                    <strong>{p.title}</strong>
+                    <button type="button" className="btn btn-primary btn-sm" onClick={(e) => { e.preventDefault(); void viewPaperPdf(p.id); }}>
+                      Xem PDF đề
+                    </button>
+                  </div>
+                  <ul className="exam-paper-view-resources">
+                    <li>📄 Đề chính (PDF)</li>
+                    {(p.resources || []).length === 0 ? (
+                      <li className="text-muted">Không có tài nguyên kèm</li>
+                    ) : (
+                      (p.resources || []).map((r) => (
+                        <li key={r.id}>
+                          📎 {r.fileName}
+                          <span className="exam-paper-view-actions">
+                            {/\.(pdf|png|jpe?g|gif|webp|txt)$/i.test(r.fileName) && (
+                              <button type="button" className="link-btn" onClick={() => viewPaperResource(p.id, r.id, r.fileName)}>
+                                Xem
+                              </button>
+                            )}
+                            <button type="button" className="link-btn" onClick={() => downloadPaperResource(p.id, r.id, r.fileName)}>
+                              Tải
+                            </button>
+                          </span>
+                        </li>
+                      ))
+                    )}
+                  </ul>
+                </div>
+              ))}
+            </div>
+          </div>
+        </div>
+      )}
+
       {selectedStudent && (
         <StudentDetailModal
           student={selectedStudent}