Create app.py

app.py

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+import streamlit as st
+from langchain.prompts import PromptTemplate
+from langchain.chains import LLMChain
+from langchain_google_genai import ChatGoogleGenerativeAI
+import fitz
+import json
+import docx
+import os
+
+
+# Session states
+if "mcqs" not in st.session_state:
+    st.session_state.mcqs = []
+if "current_q" not in st.session_state:
+    st.session_state.current_q = 0
+if "user_answers" not in st.session_state:
+    st.session_state.user_answers = {}
+if "quiz_finished" not in st.session_state:
+    st.session_state.quiz_finished = False
+if "language" not in st.session_state:
+    st.session_state.language = "English"
+
+# Language selection in sidebar
+st.sidebar.title("🌐 Language / 언어")
+language = st.sidebar.selectbox(
+    "Select Language / 언어 선택",
+    ["English", "한국어"],
+    index=0 if st.session_state.language == "English" else 1
+)
+st.session_state.language = language
+
+# UI Text Dictionary
+ui_text = {
+    "English": {
+        "title": "📄 File-based MCQ Generator",
+        "sidebar_title": "Upload & Settings",
+        "upload_prompt": "Upload a file (PDF or Word)",
+        "num_questions": "Number of questions",
+        "generate_button": "Generate MCQs",
+        "no_file_error": "Please upload a file.",
+        "generating": "Extracting text and generating MCQs...",
+        "success": "✅ MCQs generated successfully!",
+        "error": "Error generating MCQs:",
+        "question_prefix": "Question",
+        "choose_answer": "Choose an answer:",
+        "next_button": "Next",
+        "quiz_completed": "🎉 Quiz completed!",
+        "results_header": "📊 Quiz Results",
+        "your_answer": "Your answer:",
+        "correct_answer": "Correct answer:",
+        "score": "✅ You scored {score} out of {total}"
+    },
+    "한국어": {
+        "title": "📄 파일 기반 객관식 문제 생성기",
+        "sidebar_title": "파일 업로드 및 설정",
+        "upload_prompt": "파일 업로드 (PDF 또는 Word)",
+        "num_questions": "문제 개수",
+        "generate_button": "문제 생성",
+        "no_file_error": "파일을 업로드해주세요.",
+        "generating": "텍스트 추출 및 문제 생성 중...",
+        "success": "✅ 문제가 성공적으로 생성되었습니다!",
+        "error": "문제 생성 오류:",
+        "question_prefix": "문제",
+        "choose_answer": "답을 선택하세요:",
+        "next_button": "다음",
+        "quiz_completed": "🎉 퀴즈가 완료되었습니다!",
+        "results_header": "📊 퀴즈 결과",
+        "your_answer": "당신의 답:",
+        "correct_answer": "정답:",
+        "score": "✅ {total}문제 중 {score}문제를 맞추셨습니다"
+    }
+}
+
+# Get current language texts
+texts = ui_text[language]
+
+# Title
+st.title(texts["title"])
+
+# Sidebar
+st.sidebar.title(texts["sidebar_title"])
+
+# Upload file
+uploaded_file = st.sidebar.file_uploader(texts["upload_prompt"], type=["pdf", "docx"])
+
+# Number of questions
+number_of_questions = st.sidebar.slider(texts["num_questions"], min_value=1, max_value=20, value=5)
+
+# Gemini setup
+GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
+llm = ChatGoogleGenerativeAI(
+    model="gemini-2.0-flash-exp",
+    google_api_key=GOOGLE_API_KEY,
+    temperature=0.7
+)
+
+# Templates for different languages
+template_english = """
+You are an expert MCQ generator. Generate {number} unique multiple-choice questions from the given text.
+Each question must have exactly 1 correct answer and 3 incorrect options.
+Strictly return output in the following JSON format (no explanations, no markdown):
+
+[
+  {{
+    "question": "What is ...?",
+    "options": ["Option A", "Option B", "Option C", "Option D"],
+    "answer": "Option D"
+  }},
+  ...
+]
+
+TEXT:
+{text}
+"""
+
+template_korean = """
+당신은 전문 객관식 문제 출제자입니다. 주어진 텍스트에서 {number}개의 고유한 객관식 문제를 생성하세요.
+각 문제는 정확히 1개의 정답과 3개의 오답을 가져야 합니다.
+다음 JSON 형식으로만 출력하세요 (설명이나 마크다운 없이):
+
+[
+  {{
+    "question": "...는 무엇입니까?",
+    "options": ["선택지 A", "선택지 B", "선택지 C", "선택지 D"],
+    "answer": "선택지 D"
+  }},
+  ...
+]
+
+텍스트:
+{text}
+"""
+
+# Select template based on language
+template = template_english if language == "English" else template_korean
+
+prompt = PromptTemplate(
+    input_variables=["text", "number"],
+    template=template
+)
+
+mcq_chain = LLMChain(llm=llm, prompt=prompt)
+
+# Extract text from PDF or Word
+def extract_text(file):
+    if file.name.endswith(".pdf"):
+        # Read the entire file content into memory
+        file_bytes = file.read()
+        # Open the PDF from the byte stream
+        doc = fitz.open(stream=file_bytes, filetype="pdf")
+        # Extract text from all pages
+        text = ""
+        for page in doc:
+            text += page.get_text()
+        return text
+    elif file.name.endswith(".docx"):
+        doc = docx.Document(file)
+        return "\n".join([para.text for para in doc.paragraphs])
+    return ""
+
+# Generate MCQs
+if st.sidebar.button(texts["generate_button"]):
+    if uploaded_file is None:
+        st.error(texts["no_file_error"])
+    else:
+        with st.spinner(texts["generating"]):
+            text = extract_text(uploaded_file)
+            try:
+                response = mcq_chain.run(text=text, number=str(number_of_questions))
+                # Clean the response to extract JSON
+                response = response.strip()
+                if response.startswith("```json"):
+                    response = response[7:]
+                if response.endswith("```"):
+                    response = response[:-3]
+                mcqs_json = json.loads(response)
+                st.session_state.mcqs = mcqs_json
+                st.session_state.current_q = 0
+                st.session_state.user_answers = {}
+                st.session_state.quiz_finished = False
+                st.success(texts["success"])
+            except Exception as e:
+                st.error(f"{texts['error']} {e}")
+
+# Display question
+if st.session_state.mcqs and not st.session_state.quiz_finished:
+    idx = st.session_state.current_q
+    q_data = st.session_state.mcqs[idx]
+
+    st.subheader(f"{texts['question_prefix']} {idx + 1}: {q_data['question']}")
+    
+    with st.form(key=f"form_{idx}"):
+        selected_option = st.radio(texts["choose_answer"], q_data["options"], key=f"radio_{idx}")
+        submitted = st.form_submit_button(texts["next_button"])
+
+        if submitted:
+            st.session_state.user_answers[idx] = selected_option
+            if idx < len(st.session_state.mcqs) - 1:
+                st.session_state.current_q += 1
+                st.rerun()
+            else:
+                st.session_state.quiz_finished = True
+                st.success(texts["quiz_completed"])
+                st.rerun()
+
+# Show result
+if st.session_state.quiz_finished:
+    st.header(texts["results_header"])
+    score = 0
+    total = len(st.session_state.mcqs)
+
+    for i, q in enumerate(st.session_state.mcqs):
+        user_ans = st.session_state.user_answers.get(i)
+        correct_ans = q["answer"]
+        if user_ans == correct_ans:
+            score += 1
+        
+        # Question display
+        st.markdown(f"**{texts['question_prefix']}{i+1}: {q['question']}**")
+        
+        # Answers with color coding
+        if user_ans == correct_ans:
+            st.markdown(f"- {texts['your_answer']} :green[{user_ans}] ✓")
+        else:
+            st.markdown(f"- {texts['your_answer']} :red[{user_ans}] ✗")
+        st.markdown(f"- {texts['correct_answer']} :green[{correct_ans}]")
+        st.markdown("---")
+
+    # Score display
+    score_text = texts["score"].format(score=score, total=total)
+    st.success(score_text)
+    
+    # Reset button
+    if language == "English":
+        reset_text = "Start New Quiz"
+    else:
+        reset_text = "새 퀴즈 시작"
+    
+    if st.button(reset_text):
+        st.session_state.mcqs = []
+        st.session_state.current_q = 0
+        st.session_state.user_answers = {}
+        st.session_state.quiz_finished = False
+        st.rerun()