From 9a994da7f8ced73236c2cbac4e97ee6cc3808a9b Mon Sep 17 00:00:00 2001
From: PhuocNTB <phuocntb@mieusoft.com>
Date: Fri, 3 Jul 2026 06:46:17 +0700
Subject: [PATCH] fix xem nhieu video

---
 management/src/components/ExamGridProctor.tsx | 338 ++++++++++++++++++
 .../src/components/ExamRoomWorkspace.tsx      |  18 +-
 management/src/index.css                      | 290 +++++++++++++++
 server/internal/websocket/websocket.go        |   5 +
 4 files changed, 649 insertions(+), 2 deletions(-)
 create mode 100644 management/src/components/ExamGridProctor.tsx

diff --git a/management/src/components/ExamGridProctor.tsx b/management/src/components/ExamGridProctor.tsx
new file mode 100644
index 0000000..0c1c301
--- /dev/null
+++ b/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>
+  );
+};
diff --git a/management/src/components/ExamRoomWorkspace.tsx b/management/src/components/ExamRoomWorkspace.tsx
index 9200d60..317c0b6 100644
--- a/management/src/components/ExamRoomWorkspace.tsx
+++ b/management/src/components/ExamRoomWorkspace.tsx
@@ -19,6 +19,7 @@ import { NavHistoryBar } from './NavHistoryBar';
 import { StudentAvatar } from './StudentAvatar';
 import { StudentDetailModal } from './StudentDetailModal';
 import { fmtTime, localInputToISO, toLocalInput } from './ExamsTab';
+import { ExamGridProctor } from './ExamGridProctor';
 
 const EXAM_APP_SUGGESTIONS = [...new Set([...BASE_APP_SUGGESTIONS, 'msedge', 'edge', 'acrobat', 'foxit'])];
 
@@ -87,7 +88,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
   const [onlineIds, setOnlineIds] = useState<number[]>([]);
   const [searchQuery, setSearchQuery] = useState('');
   const [selectedStudent, setSelectedStudent] = useState<StudentItem | null>(null);
-  const [activeSubTab, setActiveSubTab] = useState<'roster' | 'detail' | 'submissions'>('roster');
+  const [activeSubTab, setActiveSubTab] = useState<'roster' | 'detail' | 'submissions' | 'grid'>('roster');
   const [configOpen, setConfigOpen] = useState(false);
   const [configTab, setConfigTab] = useState<'info' | 'apps' | 'papers'>('info');
   const [papersModalOpen, setPapersModalOpen] = useState(false);
@@ -858,6 +859,13 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                   >
                     Sơ đồ sinh viên
                   </button>
+                  <button
+                    type="button"
+                    className={`tab-sub-btn ${activeSubTab === 'grid' ? 'active' : ''}`}
+                    onClick={() => setActiveSubTab('grid')}
+                  >
+                    Giám sát camera 🖥️
+                  </button>
                   <button
                     type="button"
                     className={`tab-sub-btn ${activeSubTab === 'detail' ? 'active' : ''}`}
@@ -876,7 +884,7 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
               </div>
 
               <div style={{ display: 'flex', alignItems: 'center', gap: '0.5rem', flexWrap: 'wrap' }}>
-                {activeSubTab !== 'submissions' && (
+                {activeSubTab !== 'submissions' && activeSubTab !== 'grid' && (
                   <div className="search-input-wrapper">
                     <input
                       type="text"
@@ -969,6 +977,12 @@ export const ExamRoomWorkspace: React.FC<Props> = ({ examId, onBack }) => {
                   })}
                 </div>
               )
+            ) : activeSubTab === 'grid' ? (
+              <ExamGridProctor
+                students={students}
+                onlineIds={onlineIds}
+                onSelectStudent={(s) => setSelectedStudent(toStudentItem(s))}
+              />
             ) : activeSubTab === 'detail' ? (
               <div className="session-logs-panel">
                 <div className="attendance-table-scroll table-wrapper" style={{ border: 'none' }}>
diff --git a/management/src/index.css b/management/src/index.css
index b7c0d10..6dfcb34 100644
--- a/management/src/index.css
+++ b/management/src/index.css
@@ -5105,3 +5105,293 @@ input:checked + .slider:before {
     grid-template-columns: 1fr;
   }
 }
+
+/* ── Grid Proctoring (Net Cafe / Surveillance Cam Mode) ── */
+.grid-proctor-container {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+  background: var(--bg-card, #ffffff);
+  border-radius: var(--radius-md);
+  padding: 1.25rem;
+  border: 1px solid var(--border-color);
+  box-shadow: var(--shadow-sm);
+  transition: background 0.3s;
+}
+
+.grid-proctor-container:fullscreen {
+  padding: 2rem;
+  background: #121214;
+  overflow-y: auto;
+}
+
+.grid-proctor-container:fullscreen .grid-proctor-card {
+  background: #1e1e24;
+  border-color: #2e2e38;
+}
+
+.grid-proctor-container:fullscreen .grid-proctor-card-header {
+  border-color: #2e2e38;
+}
+
+.grid-proctor-container:fullscreen .student-name {
+  color: #e4e4eb;
+}
+
+.grid-proctor-container:fullscreen .grid-proctor-card-footer {
+  border-color: #2e2e38;
+  color: #a0a0b0;
+}
+
+.grid-proctor-toolbar {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 1rem;
+  padding-bottom: 1rem;
+  border-bottom: 1px solid var(--border-light);
+}
+
+.grid-proctor-toolbar-left {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 1.25rem;
+}
+
+.grid-proctor-toolbar-right {
+  display: flex;
+  align-items: center;
+  gap: 1rem;
+}
+
+.grid-cols-selector {
+  display: flex;
+  align-items: center;
+  gap: 0.25rem;
+  background: var(--bg-subtle);
+  padding: 0.2rem;
+  border-radius: var(--radius-sm);
+  border: 1px solid var(--border-color);
+}
+
+.grid-cols-selector button {
+  padding: 0.25rem 0.5rem;
+  border: none;
+  font-size: 0.75rem;
+  font-weight: 700;
+  cursor: pointer;
+  background: transparent;
+  border-radius: 4px;
+}
+
+.grid-cols-selector button.active {
+  background: var(--accent);
+  color: #ffffff;
+}
+
+.grid-proctor-layout {
+  /* Columns configured inline */
+  transition: all 0.3s ease;
+}
+
+.grid-proctor-card {
+  display: flex;
+  flex-direction: column;
+  background: #ffffff;
+  border: 1px solid var(--border-color);
+  border-radius: var(--radius-md);
+  overflow: hidden;
+  box-shadow: var(--shadow-sm);
+  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
+  cursor: pointer;
+}
+
+.grid-proctor-card:hover {
+  transform: translateY(-2px);
+  box-shadow: var(--shadow-md);
+  border-color: var(--accent);
+}
+
+.grid-proctor-card.online {
+  border-color: rgba(13, 159, 110, 0.2);
+}
+
+.grid-proctor-card.online:hover {
+  border-color: var(--success);
+}
+
+.grid-proctor-card.offline {
+  opacity: 0.75;
+  filter: grayscale(0.2);
+}
+
+.grid-proctor-card.submitted {
+  border-left: 4px solid var(--success);
+}
+
+.grid-proctor-card-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 0.65rem 0.85rem;
+  background: var(--bg-subtle);
+  border-bottom: 1px solid var(--border-light);
+  font-size: 0.85rem;
+  font-weight: 600;
+}
+
+.student-info-left {
+  display: flex;
+  align-items: center;
+  gap: 0.5rem;
+  overflow: hidden;
+  white-space: nowrap;
+}
+
+.student-name {
+  color: var(--text-primary);
+  text-overflow: ellipsis;
+  overflow: hidden;
+  font-weight: 700;
+}
+
+.student-code {
+  font-family: monospace;
+  font-weight: 600;
+  color: var(--accent);
+  font-size: 0.8rem;
+}
+
+.status-dot {
+  width: 8px;
+  height: 8px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.status-dot.online {
+  background: var(--success);
+  box-shadow: 0 0 0 2px rgba(13, 159, 110, 0.2);
+  animation: pulse-online 1.8s infinite ease-in-out;
+}
+
+.status-dot.offline {
+  background: var(--text-muted);
+}
+
+.grid-proctor-card-body {
+  position: relative;
+  background: #141416;
+  aspect-ratio: 16 / 9;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  overflow: hidden;
+}
+
+.proctor-frame-container {
+  position: relative;
+  width: 100%;
+  height: 100%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.proctor-screen-image {
+  max-width: 100%;
+  max-height: 100%;
+  object-fit: contain;
+  user-select: none;
+}
+
+.proctor-webcam-overlay {
+  position: absolute;
+  bottom: 6px;
+  right: 6px;
+  width: 28%;
+  aspect-ratio: 4 / 3;
+  border: 1.5px solid #ffffff;
+  border-radius: 4px;
+  overflow: hidden;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
+  background: #000;
+  z-index: 10;
+}
+
+.proctor-webcam-image {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  user-select: none;
+}
+
+.proctor-placeholder {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  gap: 0.5rem;
+  color: #8e8e9e;
+  font-size: 0.8rem;
+  padding: 1rem;
+  text-align: center;
+  width: 100%;
+  height: 100%;
+}
+
+.proctor-placeholder.streaming {
+  background: #18181b;
+}
+
+.proctor-placeholder.offline {
+  background: #202023;
+  color: #71717a;
+}
+
+.proctor-placeholder .icon {
+  font-size: 1.5rem;
+  margin-bottom: 0.25rem;
+}
+
+.grid-proctor-card-footer {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 0.55rem 0.85rem;
+  background: var(--bg-subtle);
+  border-top: 1px solid var(--border-light);
+  font-size: 0.78rem;
+  color: var(--text-secondary);
+}
+
+.assigned-paper {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  max-width: 50%;
+  font-style: italic;
+}
+
+.footer-actions {
+  display: flex;
+  gap: 0.35rem;
+}
+
+.grid-proctor-empty {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  min-height: 250px;
+  color: var(--text-muted);
+  text-align: center;
+}
+
+.grid-proctor-empty span {
+  font-size: 2.5rem;
+  margin-bottom: 0.75rem;
+}
+
diff --git a/server/internal/websocket/websocket.go b/server/internal/websocket/websocket.go
index 49d32f3..48af6a5 100644
--- a/server/internal/websocket/websocket.go
+++ b/server/internal/websocket/websocket.go
@@ -106,6 +106,11 @@ func (h *WsHub) Register(c *SocketClient) {
 	if c.Role == "student" {
 		h.students[c.StudentID] = c
 		log.Printf("[WS] Student %d registered (Address: %s, Class: %d)", c.StudentID, c.Addr, c.ClassID)
+		if subs, exists := h.subscribers[c.StudentID]; exists && len(subs) > 0 {
+			_ = c.Conn.WriteJSON(SocketMsg{Event: "start_screenshot_stream"})
+			_ = c.Conn.WriteJSON(SocketMsg{Event: "start_webcam_stream"})
+			log.Printf("[WS] Student %d has active subscribers. Sent start stream commands.", c.StudentID)
+		}
 	} else if c.Role == "teacher" {
 		h.teachers[c.Addr] = c
 		if c.StaffID > 0 {