Blame for classroom_static/student.js

const SNIPPETS=[["基礎","輸入與輸出",'name = input("名字：")\nprint("你好", name)'],["判斷","if / elif / else",'if score >= 90:\n    print("A")\nelse:\n    print("繼續加油")'],["迴圈","for 與 range",'for number in range(1, 6):\n    print(number)'],["迴圈","while",'while True:\n    choice = input("選擇：")\n    if choice == "q":\n        break'],["資料","list",'items = []\nitems.append("線索")\nfor item in items:\n    print(item)'],["資料","dict",'student = {"name": "Alex"}\nprint(student.get("team", "未分組"))'],["函式","def / return",'def add(a, b):\n    return a + b'],["檔案","引入自己的模組",'from clues import find_clue'],["檔案","讀取 JSON",'import json\nwith open("data.json", encoding="utf-8") as file:\n    data = json.load(file)'],["錯誤","try / except",'try:\n    age = int(input("年齡："))\nexcept ValueError:\n    print("請輸入整數")'],["Pygame","瀏覽器版 Pygame 入門",'import asyncio\nimport pygame\n\nasync def main():\n    pygame.init()\n    screen = pygame.display.set_mode((640, 480))\n    pygame.display.set_caption("我的第一個遊戲")\n    clock = pygame.time.Clock()\n    x = 300\n    running = True\n\n    while running:\n        for event in pygame.event.get():\n            if event.type == pygame.QUIT:\n                running = False\n\n        keys = pygame.key.get_pressed()\n        if keys[pygame.K_LEFT]:\n            x -= 4\n        if keys[pygame.K_RIGHT]:\n            x += 4\n\n        screen.fill((24, 34, 52))\n        pygame.draw.circle(screen, (255, 190, 80), (x, 240), 28)\n        pygame.display.flip()\n        await asyncio.sleep(1 / 60)\n\n    pygame.quit()\n\n# 瀏覽器版會自動呼叫 async main()，不用另外加 asyncio.run(main())']].map(([category,title,code])=>({category,title,code}));
const $=id=>document.getElementById(id),E={};["identityDialog","identityForm","identityError","classCode","displayName","studentIdentity","identityButton","connectionDot","connectionText","helpButton","helpStatus","weekSelect","projectName","templateButton","progressButton","importButton","exportButton","checkpointButton","submitButton","fileImport","fileList","newFileButton","activeFileLabel","lessonHeading","lessonLabel","lessonGuideContent","syntaxSearch","categoryFilters","snippetList","snippetCount","runButton","stopButton","toggleReferenceButton","toggleConsoleButton","studentLayout","editorPanel","referencePanel","consolePanel","referenceResizer","consoleResizer","consoleInputForm","consoleInput","consoleOutput","consoleTabs","consoleOutputTab","pygameOutputTab","consoleStream","pygameFrame","consoleHint","clearOutputButton","runStatusDot","runStatusText","saveStatus","submitStatus","toast","progressDialog","progressList"].forEach(id=>E[id]=$(id));
const editor=CodeMirror.fromTextArea($("codeEditor"),{mode:"python",theme:"material-darker",lineNumbers:true,indentUnit:4,tabSize:4,extraKeys:{Tab:cm=>cm.replaceSelection("    ")}});
let loadedStorageKey=null,restoredSocket=null,draftSavedAt=0;
let studentId=localStorage.getItem("classroom_student_id")||"",allowLegacyDraft=!!studentId,catalog={courses:[]};
const HELP_COOLDOWN_MS=300000;
let course,files={"main.py":"# 在這裡寫 Python\n"},activeFile="main.py",socket,worker,workerReady=false,running=false,pygameRunning=false,needsHelp=false,helpCooldownUntil=null,helpCooldownMs=HELP_COOLDOWN_MS,checkpointAt=null,submittedAt=null,output="",suppress=false,timer,reconnect,category="全部",inputBuffer,inputControl,inputBytes,stdoutDecoder=new TextDecoder(),stderrDecoder=new TextDecoder();
const clean=v=>String(v||"").trim().replace(/[^0-9A-Za-z_\-一-鿿]/g,"").slice(0,48),lesson=()=>E.weekSelect.value||"week02",lessonInfo=()=>course?.weeks.find(item=>item.id===lesson()),workspace=()=>lessonInfo()?.workspace_id||lesson(),key=()=>`classroom_project_${localStorage.getItem("classroom_code")}_${studentId}_${workspace()}`,legacyKey=()=>`classroom_project_${localStorage.getItem("classroom_code")}_${workspace()}`;
function toast(t){E.toast.textContent=t;E.toast.classList.add("visible");setTimeout(()=>E.toast.classList.remove("visible"),1900)}
function send(m){if(socket?.readyState!==WebSocket.OPEN||restoredSocket!==socket||loadedStorageKey!==key())return false;socket.send(JSON.stringify(m));return true}
function esc(t){return String(t).replaceAll("&","&amp;").replaceAll("<","&lt;").replaceAll(">","&gt;").replaceAll('"',"&quot;")}
function hasWork(projectFiles){return Object.entries(projectFiles||{}).some(([path,value])=>typeof value==="string"&&(path!=="main.py"||!["","# 在這裡寫 Python","# 專案入口"].includes(value.trim())))}
function readLocal(){for(const storageKey of [key(),...(allowLegacyDraft?[legacyKey()]:[])]){try{const value=JSON.parse(localStorage.getItem(storageKey)||"null");if(value?.files)return value}catch(_){}}return null}
function backupLocal(storageKey,value){
  if(!storageKey||!hasWork(value?.files))return;
  try{const backupKey=`${storageKey}_recovery`,items=JSON.parse(localStorage.getItem(backupKey)||"[]"),fingerprint=JSON.stringify(value.files);if(items.some(item=>JSON.stringify(item.files)===fingerprint))return;localStorage.setItem(backupKey,JSON.stringify([{...value,savedAt:value.savedAt||Date.now()},...items].slice(0,5)))}catch(_){toast("本機備份空間不足，請匯出 ZIP 保存作品")}
}
function saveLocal(savedAt=Date.now()){
  if(!loadedStorageKey)return;
  draftSavedAt=savedAt;
  try{const previous=JSON.parse(localStorage.getItem(loadedStorageKey)||"null");if(hasWork(previous?.files)&&!hasWork(files))backupLocal(loadedStorageKey,previous);localStorage.setItem(loadedStorageKey,JSON.stringify({files:{...files},activeFile,projectName:E.projectName.value,output,savedAt}))}catch(_){toast("本機儲存空間不足，請匯出 ZIP 保存作品")}
}
function scheduleSync(){
  clearTimeout(timer);const current=socket,storageKey=loadedStorageKey;
  const message={type:"project",files:{...files},active_file:activeFile,project_name:E.projectName.value};
  timer=setTimeout(()=>{if(socket===current&&loadedStorageKey===storageKey&&send(message))E.saveStatus.textContent="同步中"},450);
}
function sync(){if(!loadedStorageKey||loadedStorageKey!==key())return;saveLocal();E.saveStatus.textContent=restoredSocket===socket?"同步中":"保存在此裝置";scheduleSync()}
function openFile(path){if(loadedStorageKey!==key()||!(path in files))return;if(activeFile in files&&!suppress)files[activeFile]=editor.getValue();activeFile=path;suppress=true;editor.setValue(files[path]);suppress=false;E.activeFileLabel.textContent=path;editor.setOption("mode",path.endsWith(".py")?"python":"text");renderFiles()}
function setProject(next,name,preferred="main.py",restoring=false){
  if(!loadedStorageKey||loadedStorageKey!==key())return toast("工作區尚未載入完成，請稍候");
  if(!restoring)backupLocal(loadedStorageKey,{files:{...files},activeFile,projectName:E.projectName.value,output,savedAt:Date.now()});
  files=Object.fromEntries(Object.entries(next||{}).filter(([p,v])=>typeof v==="string"&&!p.includes("..")));files["main.py"]??="# 專案入口\n";E.projectName.value=name||"";const firstFile=Object.hasOwn(files,preferred)?preferred:"main.py";activeFile="";openFile(firstFile);if(!restoring)sync();
}
function renderFiles(){E.fileList.innerHTML=Object.keys(files).sort((a,b)=>a==="main.py"?-1:b==="main.py"?1:a.localeCompare(b)).map(p=>`<div class="file-row ${p===activeFile?"selected":""}"><button data-open="${esc(p)}">◇ ${esc(p)}</button>${p!=="main.py"?`<button class="file-remove" data-remove="${esc(p)}">×</button>`:""}</div>`).join("");E.fileList.querySelectorAll("[data-open]").forEach(b=>b.onclick=()=>openFile(b.dataset.open));E.fileList.querySelectorAll("[data-remove]").forEach(b=>b.onclick=()=>{if(loadedStorageKey!==key())return;if(confirm(`刪除 ${b.dataset.remove}？`)){delete files[b.dataset.remove];if(activeFile===b.dataset.remove)activeFile="";openFile(activeFile||"main.py");sync()}})}
function projectLoading(loading){
  editor.setOption("readOnly",loading);
  [E.projectName,E.newFileButton,E.importButton,E.progressButton,E.checkpointButton,E.submitButton].forEach(control=>control.disabled=loading);
  E.templateButton.disabled=loading||!lessonInfo()?.template;
}
function connect(){
  clearTimeout(reconnect);clearTimeout(timer);
  if(loadedStorageKey){files[activeFile]=editor.getValue();saveLocal(draftSavedAt)}
  restoredSocket=null;projectLoading(true);
  const previous=socket;
  if(previous){previous.onclose=null;previous.close()}
  const c=clean(localStorage.getItem("classroom_code")),n=localStorage.getItem("classroom_name")?.trim();
  if(!c||!n||!studentId){E.identityDialog.showModal();return}
  E.studentIdentity.textContent=`${c} · ${n}`;E.connectionText.textContent="連線中";
  const scheme=location.protocol==="https:"?"wss":"ws";
  const q=new URLSearchParams({class_code:c,student_id:studentId,display_name:n,week_id:workspace()});
  const current=new WebSocket(`${scheme}://${location.host}/ws/classroom/student?${q}`);socket=current;
  current.onopen=()=>{if(socket!==current)return;E.connectionDot.className="status-dot online";E.connectionText.textContent="已連線"};
  const connectionKey=key();
  current.onmessage=e=>{
    if(socket!==current||key()!==connectionKey)return;
    const m=JSON.parse(e.data);
    if(m.type==="restore"){
      const local=readLocal(),s=m.state;
      const server={files:s.files,activeFile:s.active_file,projectName:s.project_name,output:s.output};
      const localWork=hasWork(local?.files),serverWork=hasWork(server.files);
      const src=local&&(localWork&&!serverWork||(localWork===serverWork&&Number(local.savedAt||0)>Number(s.updated_at||0)))?local:server;
      if(src===server)backupLocal(connectionKey,local);
      else if(serverWork&&JSON.stringify(server.files)!==JSON.stringify(local.files))backupLocal(connectionKey,{...server,savedAt:s.updated_at});
      loadedStorageKey=connectionKey;restoredSocket=current;projectLoading(false);
      output=src.output||"";E.consoleOutput.textContent=output||"尚無執行結果。";checkpointAt=s.checkpoint_at;submittedAt=s.submitted_at;needsHelp=!!s.needs_help;helpCooldownUntil=s.help_cooldown_until;helpCooldownMs=Number(s.help_cooldown_ms??helpCooldownMs);renderLesson();renderState();setProject(src.files,src.projectName,src.activeFile,true);saveLocal(src===local?local.savedAt:s.updated_at);scheduleSync();send({type:"output",output});
    }
    if(m.type==="identity"&&typeof m.display_name==="string"){
      localStorage.setItem("classroom_name",m.display_name);
      E.studentIdentity.textContent=`${clean(localStorage.getItem("classroom_code"))} · ${m.display_name}`;
      toast("老師已更新你的名單姓名");
    }
    if(m.type==="help_ack"){needsHelp=false;helpCooldownUntil=m.help_cooldown_until??helpCooldownUntil;const duration=Number(m.help_cooldown_ms??helpCooldownMs);if(duration!==helpCooldownMs){helpCooldownMs=duration;renderLesson()}E.helpStatus.textContent="老師已回應你的求助；冷卻結束後可以再次呼叫。";renderState();toast("老師已回應你的求助")}
    if(m.type==="help_rejected"){needsHelp=!!m.needs_help;helpCooldownUntil=m.help_cooldown_until??helpCooldownUntil;const duration=Number(m.help_cooldown_ms??helpCooldownMs);if(duration!==helpCooldownMs){helpCooldownMs=duration;renderLesson()}E.helpStatus.textContent=m.message||"請稍後再呼叫老師。";renderState();toast(m.message||"請稍後再呼叫老師")}
    if(m.type==="write_rejected"){E.saveStatus.textContent="未儲存";if(m.kind==="checkpoint"){E.checkpointButton.disabled=false;E.checkpointButton.textContent="暫存版本"}if(m.kind==="submit"){E.submitButton.disabled=false;E.submitButton.textContent="正式提交"}toast(m.message||"儲存受到限制，請稍後再試");send({type:"ping"})}
    if(["ack","pong"].includes(m.type)){if(typeof m.needs_help==="boolean"){const seen=needsHelp&&!m.needs_help;needsHelp=m.needs_help;if(seen){E.helpStatus.textContent="老師已回應你的求助。";toast("老師已回應你的求助")}}if(Object.prototype.hasOwnProperty.call(m,"help_cooldown_until"))helpCooldownUntil=m.help_cooldown_until;if(Object.prototype.hasOwnProperty.call(m,"help_cooldown_ms")){const duration=Number(m.help_cooldown_ms);if(duration!==helpCooldownMs){helpCooldownMs=duration;renderLesson()}}if(Object.prototype.hasOwnProperty.call(m,"checkpoint_at"))checkpointAt=m.checkpoint_at;if(Object.prototype.hasOwnProperty.call(m,"submitted_at"))submittedAt=m.submitted_at;renderState();if(m.type==="ack"){E.saveStatus.textContent="已同步";if(m.version_kind==="checkpoint"){E.checkpointButton.disabled=false;E.checkpointButton.textContent="暫存版本";toast("暫存版本已建立，可以從進度載回")}if(m.version_kind==="submit"){E.submitButton.disabled=false;E.submitButton.textContent="正式提交";toast("正式提交已完成；尚未發布 Demo")}}if(m.version_warning)toast(m.version_warning)}
  };
  current.onclose=async e=>{if(socket!==current)return;restoredSocket=null;E.connectionDot.className="status-dot error";E.connectionText.textContent="已離線";E.saveStatus.textContent="保存在此裝置";E.checkpointButton.disabled=false;E.checkpointButton.textContent="暫存版本";E.submitButton.disabled=false;E.submitButton.textContent="正式提交";if(e.code===4001){loadedStorageKey=null;E.connectionText.textContent="另一個分頁已開啟";projectLoading(true);toast("此學生已在另一個分頁開啟，請使用該分頁繼續，避免互相覆蓋");return}if(e.code===4004||e.code===4404){localStorage.removeItem("classroom_student_id");localStorage.removeItem("classroom_name");studentId="";await loadCatalog();E.identityError.textContent=e.code===4004?"老師已將你從名單移除。":"姓名與班級名單不符，請重新輸入。";E.identityDialog.showModal();return}reconnect=setTimeout(connect,2500)};
}
function helpCooldownLabel(){return helpCooldownMs>=60000?`${Math.ceil(helpCooldownMs/60000)} 分鐘`:helpCooldownMs>0?`${Math.ceil(helpCooldownMs/1000)} 秒`:"沒有冷卻"}
function renderHelpButton(){const remaining=Math.max(0,Number(helpCooldownUntil||0)-Date.now()),seconds=Math.ceil(remaining/1000),label=needsHelp?"取消求助請求":remaining?`再次呼叫 ${Math.floor(seconds/60)}:${String(seconds%60).padStart(2,"0")}`:"請老師協助";E.helpButton.disabled=!needsHelp&&remaining>0;E.helpButton.classList.toggle("active",needsHelp);E.helpButton.textContent=label;E.helpButton.title=needsHelp?`老師已收到求助；取消後仍會保留 ${helpCooldownLabel()} 冷卻時間。`:`成功呼叫後有 ${helpCooldownLabel()} 冷卻。`}
function renderState(){renderHelpButton();const time=value=>new Date(value).toLocaleTimeString("zh-TW",{hour:"2-digit",minute:"2-digit"}),labels=[];if(checkpointAt)labels.push(`最近暫存 ${time(checkpointAt)}`);if(submittedAt)labels.push(`最近正式提交 ${time(submittedAt)}`);E.submitStatus.textContent=labels.join(" · ")||"尚無暫存或正式提交"}
let editorRefreshFrame;
function refreshEditorLayout(){cancelAnimationFrame(editorRefreshFrame);editorRefreshFrame=requestAnimationFrame(()=>{editor.refresh();editorRefreshFrame=requestAnimationFrame(()=>editor.refresh())})}
const panelDefaults={reference:280,console:360},panelMinimums={reference:220,console:260},panelMaximums={reference:480,console:600};
function panelElement(side){return side==="reference"?E.referencePanel:E.consolePanel}
function resizerElement(side){return side==="reference"?E.referenceResizer:E.consoleResizer}
function panelLimits(side){
  const other=side==="reference"?"console":"reference",otherHidden=E.studentLayout.classList.contains(`${other}-hidden`),otherWidth=otherHidden?0:panelElement(other).getBoundingClientRect().width;
  const dividerCount=(E.studentLayout.classList.contains("reference-hidden")?0:1)+(E.studentLayout.classList.contains("console-hidden")?0:1);
  const available=E.studentLayout.clientWidth-320-otherWidth-dividerCount*9;
  return {min:panelMinimums[side],max:Math.max(panelMinimums[side],Math.min(panelMaximums[side],available))};
}
function setPanelWidth(side,value,persist=true){
  const requested=parseFloat(value),limits=panelLimits(side),width=Math.round(Math.min(limits.max,Math.max(limits.min,Number.isFinite(requested)?requested:panelDefaults[side]))),resizer=resizerElement(side);
  E.studentLayout.style.setProperty(`--${side}-width`,`${width}px`);
  resizer.setAttribute("aria-valuemin",String(limits.min));resizer.setAttribute("aria-valuemax",String(limits.max));resizer.setAttribute("aria-valuenow",String(width));
  if(persist)localStorage.setItem(`classroom_${side}_width`,String(width));
  refreshEditorLayout();
}
function syncPanelWidths(persist=false){setPanelWidth("reference",getComputedStyle(E.studentLayout).getPropertyValue("--reference-width"),persist);setPanelWidth("console",getComputedStyle(E.studentLayout).getPropertyValue("--console-width"),persist)}
function setupResizer(side){
  const resizer=resizerElement(side);let startX=0,startWidth=0;
  const move=e=>{if(!resizer.hasPointerCapture(e.pointerId))return;const delta=e.clientX-startX;setPanelWidth(side,startWidth+(side==="reference"?delta:-delta))};
  const finish=e=>{if(resizer.hasPointerCapture(e.pointerId))resizer.releasePointerCapture(e.pointerId);resizer.classList.remove("dragging");document.body.classList.remove("panel-resizing")};
  resizer.addEventListener("pointerdown",e=>{if(matchMedia("(max-width: 980px)").matches)return;startX=e.clientX;startWidth=panelElement(side).getBoundingClientRect().width;resizer.setPointerCapture(e.pointerId);resizer.classList.add("dragging");document.body.classList.add("panel-resizing");e.preventDefault()});
  resizer.addEventListener("pointermove",move);resizer.addEventListener("pointerup",finish);resizer.addEventListener("pointercancel",finish);
  resizer.addEventListener("dblclick",()=>setPanelWidth(side,panelDefaults[side]));
  resizer.addEventListener("keydown",e=>{if(!["ArrowLeft","ArrowRight","Home","End"].includes(e.key))return;e.preventDefault();const limits=panelLimits(side),current=panelElement(side).getBoundingClientRect().width;if(e.key==="Home")setPanelWidth(side,limits.min);else if(e.key==="End")setPanelWidth(side,limits.max);else{const dividerDirection=e.key==="ArrowRight"?1:-1;setPanelWidth(side,current+(side==="reference"?dividerDirection:-dividerDirection)*16)}});
}
function initResizablePanels(){
  const savedReference=Number(localStorage.getItem("classroom_reference_width")),savedConsole=Number(localStorage.getItem("classroom_console_width"));
  if(Number.isFinite(savedReference)&&savedReference>0)E.studentLayout.style.setProperty("--reference-width",`${savedReference}px`);
  if(Number.isFinite(savedConsole)&&savedConsole>0)E.studentLayout.style.setProperty("--console-width",`${savedConsole}px`);
  setupResizer("reference");setupResizer("console");new ResizeObserver(refreshEditorLayout).observe(E.editorPanel);window.addEventListener("resize",()=>syncPanelWidths(false));
}
function setLayout(referenceHidden,consoleHidden){E.studentLayout.classList.toggle("reference-hidden",referenceHidden);E.studentLayout.classList.toggle("console-hidden",consoleHidden);E.toggleReferenceButton.setAttribute("aria-pressed",String(referenceHidden));E.toggleConsoleButton.setAttribute("aria-pressed",String(consoleHidden));E.toggleReferenceButton.textContent=referenceHidden?"顯示側欄":"隱藏側欄";E.toggleConsoleButton.textContent=consoleHidden?"顯示 Console":"隱藏 Console";localStorage.setItem("classroom_hide_reference",String(referenceHidden));localStorage.setItem("classroom_hide_console",String(consoleHidden));requestAnimationFrame(()=>{syncPanelWidths(false);refreshEditorLayout()})}
function renderStructuredGuide(guide){
  const bank=Array.isArray(guide.question_bank)?guide.question_bank:[];
  const flow=Array.isArray(guide.flow)?guide.flow:[];
  const checklist=Array.isArray(guide.checklist)?guide.checklist:[];
  const rules=Array.isArray(guide.question_rules)?guide.question_rules:[];
  const sourceUrl=String(guide.source_url||"");
  const sourceLink=/^https:\/\//i.test(sourceUrl)?`<a class="lesson-source-link" href="${esc(sourceUrl)}" target="_blank" rel="noopener noreferrer">查看官方資料集</a>`:"";
  return `
    <section class="lesson-guide-block lesson-target"><h2>本週目標</h2><p>${esc(guide.goal||"")}</p></section>
    ${bank.length?`<section class="lesson-guide-block"><h2>可選研究問題</h2><p>先選一題，改成你真正好奇的比較。</p><ul>${bank.map(item=>`<li><strong>${esc(item.group||"選題")}</strong> ${esc(item.text||"")}</li>`).join("")}</ul></section>`:""}
    ${guide.source_title?`<section class="lesson-guide-block"><h2>共用範例資料</h2><p><strong>${esc(guide.source_title)}</strong><br>${esc(guide.source_note||"")}</p>${sourceLink}</section>`:""}
    ${rules.length?`<details class="lesson-details"><summary>自訂題目檢查</summary><ul>${rules.map(item=>`<li>${esc(item)}</li>`).join("")}</ul></details>`:""}
    ${flow.length?`<section class="lesson-guide-block"><h2>課堂流程｜120 分鐘</h2><ol class="lesson-timeline">${flow.map(step=>`<li><strong>${esc(step.time||"")}｜${esc(step.title||"")}：</strong>${esc(step.body||"")}</li>`).join("")}</ol></section>`:""}
    ${checklist.length?`<section class="lesson-guide-block"><h2>完成檢查</h2><ul>${checklist.map(item=>`<li>${esc(item)}</li>`).join("")}</ul></section>`:""}
    <section class="lesson-guide-block lesson-ai-note"><h2>AI 自主驗證</h2><p>${esc(guide.ai_checkpoint||"")}</p>${guide.ai_note?`<p>${esc(guide.ai_note)}</p>`:""}</section>
    <section class="lesson-help-note"><h2>本週要留下的成果</h2><p>${esc(guide.submission||"")}</p></section>
    <details class="lesson-details"><summary>暫存和正式提交的差別</summary><ul><li><strong>自動同步：</strong>老師可查看目前草稿，不會建立歷史版本。</li><li><strong>暫存版本：</strong>可載回的工作進度，不會交給老師或公開。</li><li><strong>正式提交：</strong>凍結一份交給老師檢查；老師另行發布後才會公開。</li></ul></details>
    <section class="lesson-help-note"><h2>需要老師幫忙？</h2><p>按一次就會通知老師。成功呼叫後冷卻 ${helpCooldownLabel()}；取消或老師回應都不會重置。</p></section>`;
}
function renderLesson(){
  const item=lessonInfo(),shared=item?.workspace_id&&item.workspace_id!==item.id,isClosure=item?.id==="week05";
  E.templateButton.disabled=!item?.template;
  E.templateButton.textContent=item?.template?"匯入專案起始套版":shared?"沿用目前專案":"尚未提供套版";
  E.lessonHeading.textContent=item?`Lesson ${item.lesson??item.week}｜${item.title}`:"本堂任務";
  E.lessonLabel.textContent=item?.project||"";
  if(item?.guide){E.lessonGuideContent.innerHTML=renderStructuredGuide(item.guide);setSideView("lessonView");return}
  E.lessonGuideContent.innerHTML=isClosure?`
    <section class="lesson-guide-block lesson-target"><h2>今天完成一條可玩的案件路線</h2><p>新玩家可以自己開始調查、收集線索、完成推理並看到結局。</p></section>
    <section class="lesson-guide-block"><h2>收尾檢查</h2><ul><li>至少三個地點、三項不同線索</li><li>能查看證物，重複調查不會重複加入</li><li>必要線索能解鎖推理和合理結局</li><li>空白或錯誤輸入不會讓程式中止</li></ul></section>
    <section class="lesson-guide-block"><h2>課堂流程｜120 分鐘</h2><ol class="lesson-timeline"><li><strong>0–8 分｜確認目標：</strong>說明今天的完成條件和 AI 使用規則。</li><li><strong>8–18 分｜重現現況：</strong>載入自己的舊進度、執行一次，記下第一個問題。</li><li><strong>18–28 分｜定義問題：</strong>寫下目前結果、預期結果和一個可重現的測試；示範如何請 AI 給提示。</li><li><strong>28–53 分｜修第一個阻礙：</strong>一次改一件事，每次修改後都執行確認。</li><li><strong>53–73 分｜同儕黑箱測試：</strong>同學只看操作說明試玩，記錄卡點和輸入。</li><li><strong>73–88 分｜修復並重測：</strong>挑一個最重要的問題修好，請原測試者重跑。</li><li><strong>88–106 分｜個人說明：</strong>每人 1–2 分鐘，說明一段程式、預測新測試，再實際展示。</li><li><strong>106–116 分｜保存進度：</strong>達成條件且能執行就正式提交；還有問題就暫存並寫下下一步。</li><li><strong>116–120 分｜離堂回顧：</strong>記下今天學會的事、AI 幫助和仍卡住的地方。</li></ol></section>
    <section class="lesson-guide-block lesson-ai-note"><h2>AI 使用方式</h2><p>先自己指出問題，再請 AI 解釋錯誤、給小提示或設計測試。把 AI 建議的程式放進專案執行，留下「我問了什麼／我採用或修改什麼／測試結果」。老師會請你說明程式並現場預測測試結果；不需要隱瞞有使用 AI。</p></section>
    <details class="lesson-details"><summary>自動同步、暫存和正式提交的差別</summary><ul><li><strong>自動同步：</strong>更新目前工作草稿，老師端可即時查看；不會新增一筆歷史版本。</li><li><strong>暫存版本：</strong>建立可從「選擇舊進度」載回的版本；不算交作業，也不會發布。</li><li><strong>正式提交：</strong>凍結一份交給老師檢查的版本。你仍能繼續編輯及再次提交；老師另外發布後才會公開。</li></ul></details>
    <section class="lesson-help-note"><h2>需要老師幫忙？</h2><p>按一次「請老師協助」就會通知老師。成功呼叫後冷卻 ${helpCooldownLabel()}；取消或老師回應都不會重置冷卻。等待時先寫下卡住的步驟和試過的方法。</p></section>`:`
    <section class="lesson-guide-block lesson-target"><h2>${esc(item?.output||"本堂作品任務")}</h2><p>先確認目前版本，再完成一項可以執行和說明的功能。</p></section>
    <section class="lesson-guide-block"><h2>完成後記得</h2><ul><li>執行程式並確認結果</li><li>建立暫存版本，保留可回復的進度</li><li>需要交給老師檢查時，再按正式提交</li></ul></section>
    <details class="lesson-details"><summary>暫存和正式提交的差別</summary><ul><li><strong>自動同步：</strong>老師可查看目前草稿，不會建立歷史版本。</li><li><strong>暫存版本：</strong>可載回的工作進度，不會交給老師或公開。</li><li><strong>正式提交：</strong>凍結一份交給老師檢查；老師另行發布後才會公開。</li></ul></details>
    <section class="lesson-help-note"><h2>需要老師幫忙？</h2><p>按一次就會通知老師。成功呼叫後冷卻 ${helpCooldownLabel()}；取消或老師回應都不會重置。</p></section>`;
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E.submitButton.onclick=()=>{files[activeFile]=editor.getValue();if(!files["main.py"].trim())return toast("main.py 不能為空");if(!confirm("正式提交目前版本給老師檢查？你之後仍可繼續修改並再次提交。"))return;saveLocal();if(!send({type:"submit",files,project_name:E.projectName.value}))return toast("目前離線，請連線後再提交");E.submitButton.disabled=true;E.submitButton.textContent="正在提交…"};
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