fix xem nhieu video

management/src/components/ExamGridProctor.tsx

@@ -0,0 +1,338 @@
+import React, { useEffect, useState, useRef, useMemo } from 'react';
+import { getWsUrl, type ExamRoomStudent } from '../api';
+import { openStaffChat } from '../chatEvents';
+
+interface ExamGridProctorProps {
+  students: ExamRoomStudent[];
+  onlineIds: number[];
+  onSelectStudent: (student: ExamRoomStudent) => void;
+}
+
+export const ExamGridProctor: React.FC<ExamGridProctorProps> = ({
+  students,
+  onlineIds,
+  onSelectStudent,
+}) => {
+  const [screenFrames, setScreenFrames] = useState<Record<number, string>>({});
+  const [webcamFrames, setWebcamFrames] = useState<Record<number, string>>({});
+  const [gridCols, setGridCols] = useState<number>(3);
+  const [showWebcamOverlay, setShowWebcamOverlay] = useState<boolean>(true);
+  const [searchQuery, setSearchQuery] = useState<string>('');
+  const [onlyOnline, setOnlyOnline] = useState<boolean>(false);
+  const [isFullscreen, setIsFullscreen] = useState<boolean>(false);
+
+  const wsRef = useRef<WebSocket | null>(null);
+  const gridContainerRef = useRef<HTMLDivElement>(null);
+
+  const studentIdsString = useMemo(
+    () => students.map((s) => s.studentRkId).join(','),
+    [students]
+  );
+
+  useEffect(() => {
+    if (students.length === 0) return;
+
+    const wsUrl = getWsUrl('/ws?role=teacher');
+    const ws = new WebSocket(wsUrl);
+    wsRef.current = ws;
+
+    ws.onopen = () => {
+      students.forEach((s) => {
+        ws.send(
+          JSON.stringify({
+            event: 'teacher:subscribe',
+            data: { studentId: s.studentRkId },
+          })
+        );
+      });
+    };
+
+    ws.onmessage = (event) => {
+      try {
+        const msg = JSON.parse(event.data);
+        if (msg.event === 'teacher:screenshot-stream-frame') {
+          const { studentId, imageBuffer } = msg.data;
+          setScreenFrames((prev) => ({ ...prev, [studentId]: imageBuffer }));
+        } else if (msg.event === 'teacher:webcam-stream-frame') {
+          const { studentId, imageBuffer } = msg.data;
+          setWebcamFrames((prev) => ({ ...prev, [studentId]: imageBuffer }));
+        } else if (msg.event === 'teacher:stream-stopped') {
+          const { studentId } = msg.data;
+          setScreenFrames((prev) => {
+            const next = { ...prev };
+            delete next[studentId];
+            return next;
+          });
+          setWebcamFrames((prev) => {
+            const next = { ...prev };
+            delete next[studentId];
+            return next;
+          });
+        }
+      } catch (err) {
+        console.error('Error parsing WS message in grid view:', err);
+      }
+    };
+
+    return () => {
+      if (ws.readyState === WebSocket.OPEN) {
+        students.forEach((s) => {
+          ws.send(
+            JSON.stringify({
+              event: 'teacher:unsubscribe',
+              data: { studentId: s.studentRkId },
+            })
+          );
+        });
+      }
+      ws.close();
+    };
+  }, [studentIdsString]);
+
+  // Clean up frames when students are removed or go offline
+  useEffect(() => {
+    setScreenFrames((prev) => {
+      const next = { ...prev };
+      let changed = false;
+      Object.keys(next).forEach((idStr) => {
+        const id = Number(idStr);
+        if (!onlineIds.includes(id)) {
+          delete next[id];
+          changed = true;
+        }
+      });
+      return changed ? next : prev;
+    });
+    setWebcamFrames((prev) => {
+      const next = { ...prev };
+      let changed = false;
+      Object.keys(next).forEach((idStr) => {
+        const id = Number(idStr);
+        if (!onlineIds.includes(id)) {
+          delete next[id];
+          changed = true;
+        }
+      });
+      return changed ? next : prev;
+    });
+  }, [onlineIds]);
+
+  const filteredStudents = useMemo(() => {
+    return students.filter((s) => {
+      const matchesSearch =
+        s.fullName.toLowerCase().includes(searchQuery.toLowerCase()) ||
+        s.studentCode.toLowerCase().includes(searchQuery.toLowerCase());
+      const isOnline = onlineIds.includes(s.studentRkId);
+      const matchesOnlineFilter = !onlyOnline || isOnline;
+      return matchesSearch && matchesOnlineFilter;
+    });
+  }, [students, onlineIds, searchQuery, onlyOnline]);
+
+  const handleOpenChat = (s: ExamRoomStudent, e: React.MouseEvent) => {
+    e.stopPropagation();
+    openStaffChat({
+      studentRkId: s.studentRkId,
+      fullName: s.fullName,
+      studentCode: s.studentCode,
+      email: s.email,
+    });
+  };
+
+  useEffect(() => {
+    const handleFsChange = () => {
+      setIsFullscreen(document.fullscreenElement === gridContainerRef.current);
+    };
+    document.addEventListener('fullscreenchange', handleFsChange);
+    return () => document.removeEventListener('fullscreenchange', handleFsChange);
+  }, []);
+
+  const toggleFullscreen = () => {
+    const el = gridContainerRef.current;
+    if (!el) return;
+    if (document.fullscreenElement === el) {
+      document.exitFullscreen().catch(console.error);
+    } else {
+      el.requestFullscreen().catch(console.error);
+    }
+  };
+
+  return (
+    <div className="grid-proctor-container" ref={gridContainerRef}>
+      <div className="grid-proctor-toolbar">
+        <div className="grid-proctor-toolbar-left">
+          <div className="search-input-wrapper">
+            <input
+              type="text"
+              className="search-input"
+              placeholder="Lọc sinh viên..."
+              value={searchQuery}
+              onChange={(e) => setSearchQuery(e.target.value)}
+            />
+            <span className="search-icon">🔍</span>
+          </div>
+
+          <label className="checkbox-label" style={{ display: 'flex', alignItems: 'center', gap: '0.35rem', cursor: 'pointer', fontSize: '0.85rem' }}>
+            <input
+              type="checkbox"
+              checked={onlyOnline}
+              onChange={(e) => setOnlyOnline(e.target.checked)}
+            />
+            <span>Chỉ hiện Online</span>
+          </label>
+
+          <label className="checkbox-label" style={{ display: 'flex', alignItems: 'center', gap: '0.35rem', cursor: 'pointer', fontSize: '0.85rem' }}>
+            <input
+              type="checkbox"
+              checked={showWebcamOverlay}
+              onChange={(e) => setShowWebcamOverlay(e.target.checked)}
+            />
+            <span>Đè webcam góc màn hình</span>
+          </label>
+        </div>
+
+        <div className="grid-proctor-toolbar-right">
+          <div className="grid-cols-selector">
+            <span style={{ fontSize: '0.8rem', color: 'var(--text-muted)' }}>Cột:</span>
+            <button
+              type="button"
+              className={`btn btn-secondary btn-xs ${gridCols === 2 ? 'active' : ''}`}
+              onClick={() => setGridCols(2)}
+            >
+              2
+            </button>
+            <button
+              type="button"
+              className={`btn btn-secondary btn-xs ${gridCols === 3 ? 'active' : ''}`}
+              onClick={() => setGridCols(3)}
+            >
+              3
+            </button>
+            <button
+              type="button"
+              className={`btn btn-secondary btn-xs ${gridCols === 4 ? 'active' : ''}`}
+              onClick={() => setGridCols(4)}
+            >
+              4
+            </button>
+            <button
+              type="button"
+              className={`btn btn-secondary btn-xs ${gridCols === 6 ? 'active' : ''}`}
+              onClick={() => setGridCols(6)}
+            >
+              6
+            </button>
+          </div>
+
+          <button
+            type="button"
+            className="btn btn-secondary btn-sm"
+            onClick={toggleFullscreen}
+          >
+            {isFullscreen ? '🖥️ Thu nhỏ' : '🖥️ Toàn màn hình'}
+          </button>
+        </div>
+      </div>
+
+      <div
+        className={`grid-proctor-layout`}
+        style={{
+          display: 'grid',
+          gridTemplateColumns: `repeat(${gridCols}, minmax(0, 1fr))`,
+          gap: '1rem',
+          padding: '1rem 0',
+        }}
+      >
+        {filteredStudents.map((s) => {
+          const isOnline = onlineIds.includes(s.studentRkId);
+          const screenFrame = screenFrames[s.studentRkId];
+          const webcamFrame = webcamFrames[s.studentRkId];
+
+          return (
+            <div
+              key={s.id}
+              className={`grid-proctor-card ${isOnline ? 'online' : 'offline'} ${s.submitted ? 'submitted' : ''}`}
+              onClick={() => onSelectStudent(s)}
+            >
+              <div className="grid-proctor-card-header">
+                <div className="student-info-left">
+                  <span className={`status-dot ${isOnline ? 'online' : 'offline'}`} />
+                  <span className="student-name" title={s.fullName}>
+                    {s.fullName}
+                  </span>
+                </div>
+                <span className="student-code">{s.studentCode}</span>
+              </div>
+
+              <div className="grid-proctor-card-body">
+                {isOnline ? (
+                  <div className="proctor-frame-container">
+                    {screenFrame ? (
+                      <img
+                        src={screenFrame}
+                        alt={`Màn hình ${s.fullName}`}
+                        className="proctor-screen-image"
+                        draggable={false}
+                      />
+                    ) : (
+                      <div className="proctor-placeholder streaming">
+                        <div className="sync-spinner" style={{ width: '20px', height: '20px', borderWidth: '2px', marginBottom: '0.5rem' }} />
+                        <span>Đang kết nối màn hình...</span>
+                      </div>
+                    )}
+
+                    {showWebcamOverlay && webcamFrame && (
+                      <div className="proctor-webcam-overlay">
+                        <img
+                          src={webcamFrame}
+                          alt={`Webcam ${s.fullName}`}
+                          className="proctor-webcam-image"
+                          draggable={false}
+                        />
+                      </div>
+                    )}
+                  </div>
+                ) : (
+                  <div className="proctor-placeholder offline">
+                    <span className="icon">📴</span>
+                    <span>Ngoại tuyến (Offline)</span>
+                  </div>
+                )}
+              </div>
+
+              <div className="grid-proctor-card-footer" onClick={(e) => e.stopPropagation()}>
+                <span className="assigned-paper" title={s.paperTitle || 'Chưa gán đề'}>
+                  {s.paperTitle ? `Đề: ${s.paperTitle}` : 'Chưa gán đề'}
+                </span>
+                <div className="footer-actions">
+                  <button
+                    type="button"
+                    className="btn btn-ghost btn-xs text-primary"
+                    onClick={(e) => handleOpenChat(s, e)}
+                    title="Nhắn tin cho sinh viên"
+                  >
+                    💬 Nhắn tin
+                  </button>
+                  <button
+                    type="button"
+                    className="btn btn-ghost btn-xs"
+                    onClick={() => onSelectStudent(s)}
+                    title="Xem chi tiết giám sát"
+                  >
+                    🔍 Giám sát
+                  </button>
+                </div>
+              </div>
+            </div>
+          );
+        })}
+
+        {filteredStudents.length === 0 && (
+          <div className="grid-proctor-empty" style={{ gridColumn: '1 / -1' }}>
+            <span>🔍</span>
+            <p>Không tìm thấy sinh viên nào.</p>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+};