Fix bug in app

backend/app.py

@@ -1,4 +1,3 @@
-# app.py
 from flask import Flask, request, jsonify, send_from_directory
 from flask_cors import CORS
 import os
@@ -6,16 +5,14 @@ import os
 from puzzle_dataset import get_puzzle_by_index
 from solver import solve_puzzle
 
-app = Flask(__name__)
-CORS(app)  # 如果前后端分开端口，可能需要 CORS
-
-# 读取 Example.txt 作为默认 sys_content（若用户没给就用默认）
 BASE_DIR = os.path.dirname(os.path.abspath(__file__))
 example_path = os.path.join(BASE_DIR, "Example.txt")
 with open(example_path, "r", encoding="utf-8") as f:
     DEFAULT_SYS_CONTENT = f.read()
 
+# 只初始化一次
 app = Flask(__name__, static_folder='static', static_url_path='')
+CORS(app)
 
 @app.route('/')
 def index():
@@ -24,9 +21,6 @@ def index():
 
 @app.route("/get_puzzle", methods=["GET"])
 def get_puzzle():
-    """
-    前端通过 query param ?index=xxx 获取 puzzle 内容和 expected_solution
-    """
     idx_str = request.args.get("index", "0")
     try:
         idx = int(idx_str)
@@ -44,13 +38,8 @@ def get_puzzle():
         "expected_solution": solution
     })
 
-
 @app.route("/solve", methods=["POST"])
 def solve():
-    """
-    前端 POST { index, puzzle, expected_solution, sysContent } 
-    调用 solve_puzzle，并返回比对结果和执行的 python code
-    """
     data = request.get_json()
     puzzle_index = data.get("index")
     puzzle_text = data.get("puzzle")
@@ -61,24 +50,11 @@ def solve():
         return jsonify({"success": False, "error": "Missing puzzle data"}), 400
 
     result = solve_puzzle(puzzle_index, puzzle_text, expected_solution, sys_content)
-    # result 里包含: success, solution, attempts, generatedCode, modelResponse, etc.
-
-    return jsonify({
-        "success": True,
-        "result": result
-    })
-
+    return jsonify({"success": True, "result": result})
 
 @app.route("/default_sys_content", methods=["GET"])
 def get_default_sys_content():
-    """
-    返回默认的 sys_content (Example.txt) 给前端展示或编辑
-    """
-    return jsonify({
-        "success": True,
-        "sysContent": DEFAULT_SYS_CONTENT
-    })
-
+    return jsonify({"success": True, "sysContent": DEFAULT_SYS_CONTENT})
 
 if __name__ == "__main__":
     app.run(host="0.0.0.0", port=7860, debug=False)