first commit

backend/routers/practice.py

@@ -0,0 +1,57 @@
+import random
+
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+from backend.auth import get_current_user
+from backend.database import get_db
+from backend.models import Question
+from backend.schemas import PracticeCheckRequest, PracticeStartRequest
+
+router = APIRouter(dependencies=[Depends(get_current_user)])
+
+
+@router.post("/start")
+def start_practice(payload: PracticeStartRequest, db: Session = Depends(get_db)) -> dict:
+    query = db.query(Question)
+    if payload.chapter:
+        query = query.filter(Question.chapter == payload.chapter)
+    if payload.secondary_knowledge:
+        query = query.filter(Question.secondary_knowledge == payload.secondary_knowledge)
+    if payload.question_type:
+        query = query.filter(Question.question_type == payload.question_type)
+    if payload.difficulty:
+        query = query.filter(Question.difficulty == payload.difficulty)
+    items = query.all()
+    if payload.random_mode:
+        random.shuffle(items)
+    items = items[: payload.limit]
+    return {
+        "total": len(items),
+        "items": [
+            {
+                "id": i.id,
+                "stem": i.stem,
+                "option_a": i.option_a,
+                "option_b": i.option_b,
+                "option_c": i.option_c,
+                "option_d": i.option_d,
+                "question_type": i.question_type,
+            }
+            for i in items
+        ],
+    }
+
+
+@router.post("/check")
+def check_answer(payload: PracticeCheckRequest, db: Session = Depends(get_db)) -> dict:
+    item = db.get(Question, payload.question_id)
+    if not item:
+        return {"correct": False, "message": "题目不存在"}
+    user_answer = payload.user_answer.strip().upper()
+    right_answer = item.answer.strip().upper()
+    return {
+        "correct": user_answer == right_answer,
+        "right_answer": right_answer,
+        "explanation": item.explanation,
+    }