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body.categories : [];\n const top = categories.slice(0, 5);\n if (top.length === 0) return c.json({ exercises: [] });\n\n const catPlan = top.map((t) => {\n const n = t.count >= 3 ? 2 : 1;\n return { cat: t.cat, catZh: CAT_ZH[t.cat] || t.cat, num: n };\n });\n\n const schema = {\n type: \"object\",\n properties: {\n exercises: {\n type: \"array\",\n items: {\n type: \"object\",\n properties: {\n type: { type: \"string\", enum: [\"mcq\", \"fill\", \"diagnose\", \"reorder\", \"translate\", \"write\"] },\n cat: { type: \"string\", enum: [\"LEX\", \"VERB\", \"PREP\", \"ART\", \"CAP\", \"PLURAL\", \"OTHER\"] },\n questionZh: { type: [\"string\", \"null\"] },\n questionEn: { type: [\"string\", \"null\"] },\n options: { type: [\"array\", \"null\"], items: { type: \"string\" } },\n correctIndex: { type: [\"integer\", \"null\"] },\n answer: { type: [\"string\", \"null\"] },\n wrongSentence: { type: [\"string\", \"null\"] },\n correctedSentence: { type: [\"string\", \"null\"] },\n words: { type: [\"array\", \"null\"], items: { type: \"string\" } },\n keywords: { type: [\"array\", \"null\"], items: { type: \"array\", items: { type: \"string\" } } },\n keywordLabels: { type: [\"array\", \"null\"], items: { type: \"string\" } },\n sample: { type: [\"string\", \"null\"] },\n whyMistake: { type: \"string\" },\n },\n required: [\n \"type\", \"cat\", \"questionZh\", \"questionEn\", \"options\", \"correctIndex\", \"answer\",\n \"wrongSentence\", \"correctedSentence\", \"words\", \"keywords\", \"keywordLabels\", \"sample\", \"whyMistake\",\n ],\n additionalProperties: false,\n },\n },\n },\n required: [\"exercises\"],\n additionalProperties: false,\n };\n\n const instructions =\n `你是一位英文A1(CEFR基礎入門級)課程的出題老師,學生是中文母語者。請根據學生常犯錯的文法類別,` +\n `出練習題給他加強。規則:\\n` +\n `1. 每個類別依照指定數量各出題,類別意義: LEX語序, VERB動詞變化, PREP介系詞, ART冠詞, CAP大小寫, PLURAL單複數, OTHER其他。\\n` +\n `2. type只能是 mcq/fill/diagnose/reorder/translate/write 其中一種,不可以出speak(口說)。\\n` +\n `3. 依type規則填欄位(其他欄位填null):\\n` +\n ` - mcq: questionZh(中文題目), options(4個英文選項), correctIndex(正確選項的index,從0開始)\\n` +\n ` - fill: questionEn(英文句子,空格處用___表示), answer(正確填入的單字)\\n` +\n ` - diagnose: wrongSentence(有錯誤的英文句子), correctedSentence(修正後的正確句子)\\n` +\n ` - reorder: words(打散順序的英文單字陣列), answer(正確排列後的完整句子,單字間用空格)\\n` +\n ` - translate: questionZh(中文句子要翻成英文), keywords(至少1組,每組是可接受的關鍵字陣列), keywordLabels(對應每組關鍵字的中文說明), sample(範例正確答案)\\n` +\n ` - write: questionZh(中文寫作提示), keywords, keywordLabels, sample(範例答案)\\n` +\n `4. whyMistake一定要填,針對「這位學生在這個類別常犯的錯誤」給一句繁體中文的個人化解釋,幫助他理解自己容易犯錯的原因,不要只是講解這題本身。\\n` +\n `5. 難度限制在CEFR A1範圍,詞彙簡單、句子短。\\n` +\n `6. 全部用繁體中文的中文欄位,英文句子用英文。`;\n\n const planText = catPlan.map((p) => `- ${p.catZh}(${p.cat}): ${p.num}題`).join(\"\\n\");\n\n try {\n const openai = new ValTownOpenAI({});\n const response = await openai.responses.create({\n model: \"gpt-5.4-nano\",\n instructions,\n input: `請依照以下弱點類別與題數出題:\\n${planText}`,\n text: {\n format: {\n type: \"json_schema\",\n name: \"practice_exercises\",\n schema,\n },\n },\n });\n const parsed = JSON.parse(response.output_text);\n const rawExercises: any[] = Array.isArray(parsed.exercises) ? parsed.exercises : [];\n const mapped = rawExercises.map(mapGeneratedExercise).filter(Boolean);\n return c.json({ exercises: mapped });\n } catch (err) {\n console.log(\"generate-practice error\", err);\n return c.json({ exercises: [], error: String(err) }, 200);\n }\n});\n\nfunction mapGeneratedExercise(ex: any): any | null {\n if (!ex || !ex.type || !ex.cat) return null;\n const base = { cat: ex.cat, explain: ex.whyMistake || \"\" };\n try {\n if (ex.type === \"mcq\") {\n if (!ex.questionZh || !Array.isArray(ex.options) || ex.options.length < 2 || typeof ex.correctIndex !== \"number\") return null;\n return { type: \"mcq\", ...base, q: ex.questionZh, opts: ex.options, a: ex.correctIndex };\n }\n if (ex.type === \"fill\") {\n if (!ex.questionEn || !ex.answer) return null;\n return { type: \"fill\", ...base, q: ex.questionEn, answer: ex.answer, hint: \"\" };\n }\n if (ex.type === \"diagnose\") {\n if (!ex.wrongSentence || !ex.correctedSentence) return null;\n return { type: \"diagnose\", ...base, wrong: ex.wrongSentence, correctedAnswer: ex.correctedSentence };\n }\n if (ex.type === \"reorder\") {\n if (!Array.isArray(ex.words) || ex.words.length < 2 || !ex.answer) return null;\n return { type: \"reorder\", ...base, words: ex.words, answer: ex.answer };\n }\n if (ex.type === \"translate\") {\n if (!ex.questionZh || !Array.isArray(ex.keywords) || ex.keywords.length === 0 || !ex.sample) return null;\n return { type: \"translate\", ...base, zh: ex.questionZh, keywords: ex.keywords, keywordLabels: ex.keywordLabels || [], sample: ex.sample };\n }\n if (ex.type === \"write\") {\n if (!ex.questionZh || !Array.isArray(ex.keywords) || ex.keywords.length === 0 || !ex.sample) return null;\n return { type: \"write\", ...base, prompt: ex.questionZh, keywords: ex.keywords, keywordLabels: ex.keywordLabels || [], sample: ex.sample, tip: \"\" };\n }\n return null;\n } catch {\n return null;\n }\n}\n\nconst gradeSchema = {\n type: \"object\",\n properties: {\n correct: { type: \"boolean\" },\n feedback: { type: \"string\" },\n },\n required: [\"correct\", \"feedback\"],\n additionalProperties: false,\n};\n\napp.post(\"/api/grade-answer\", async (c) => {\n const body = await c.req.json().catch(() => ({}));\n const { type, prompt, userAnswer, reference } = body as {\n type?: string;\n prompt?: string;\n userAnswer?: string;\n reference?: string;\n };\n if (!type || !userAnswer || !userAnswer.trim()) {\n return c.json({ correct: false, feedback: \"請先作答再送出。\" });\n }\n\n let instructions = \"\";\n let input = \"\";\n if (type === \"write\") {\n instructions =\n `你是一位親切的英文A1(CEFR基礎入門級)寫作老師,批改中文母語學生的英文寫作/問答練習。` +\n `規則:\\n1. 只要學生的英文語意正確、能回應題目要求,文法大致正確(允許A1程度的小瑕疵),就判定為正確(correct=true)。\\n` +\n `2. 若有明顯文法或語意錯誤導致意思不對或不通順,判定為錯誤(correct=false)。\\n` +\n `3. feedback一律用繁體中文,親切具體地說明哪裡對/錯、該怎麼修正,並可附上一個修正後的英文例句。控制在80字以內。`;\n input = `題目提示:${prompt || \"\"}\\n參考範例答案(僅供參考,不要求完全一致):${reference || \"\"}\\n學生的英文回答:${userAnswer}`;\n } else if (type === \"translate\") {\n instructions =\n `你是一位親切的英文A1(CEFR基礎入門級)翻譯老師,批改中文母語學生把中文句子翻成英文的答案。` +\n `規則:\\n1. 只要語意正確傳達原句意思、文法大致正確(允許A1程度的小瑕疵),就判定為正確(correct=true)。\\n` +\n `2. 若語意錯誤或文法嚴重錯誤導致意思不對,判定為錯誤(correct=false)。\\n` +\n `3. feedback一律用繁體中文,親切具體地說明哪裡對/錯、該怎麼修正,並附上建議的正確英文翻譯。控制在80字以內。`;\n input = `中文原句:${prompt || \"\"}\\n參考範例翻譯(僅供參考):${reference || \"\"}\\n學生的英文翻譯:${userAnswer}`;\n } else if (type === \"diagnose\") {\n instructions =\n `你是一位親切的英文A1(CEFR基礎入門級)文法老師。題目給學生一個有錯誤的英文句子,學生要寫出修正後的正確句子。` +\n `規則:\\n1. 只要學生修正後的句子文法正確、語意通順,就判定為正確(correct=true),不要求逐字跟參考答案一樣。\\n` +\n `2. 若修正後仍有錯誤,判定為錯誤(correct=false)。\\n` +\n `3. feedback一律用繁體中文,親切具體地說明原句錯在哪裡、學生的修正對不對,並附上正確答案。控制在80字以內。`;\n input = `原本有錯誤的句子:${prompt || \"\"}\\n參考正確答案(僅供參考):${reference || \"\"}\\n學生的修正答案:${userAnswer}`;\n } else {\n return c.json({ correct: false, feedback: \"不支援的題型。\" });\n }\n\n try {\n const openai = new ValTownOpenAI({});\n const response = await openai.responses.create({\n model: \"gpt-5.4-nano\",\n instructions,\n input,\n text: {\n format: {\n type: \"json_schema\",\n name: \"grade_result\",\n schema: gradeSchema,\n },\n },\n });\n const parsed = JSON.parse(response.output_text);\n return c.json({\n correct: !!parsed.correct,\n feedback: typeof parsed.feedback === \"string\" ? 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🎓 A1 母語化課程

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