import os
from datetime import datetime

class HistoryManager:
    def load_history(self, folder):
        history = set()
        if not os.path.exists(folder):
            os.makedirs(folder)
            return history
        for file in os.listdir(folder):
            if file.endswith(".txt"):
                with open(os.path.join(folder, file), "r", encoding="utf-8") as f:
                    history.update(line.strip() for line in f if line.strip())
        return history

    def save_questions(self, folder, questions):
        filename = datetime.now().strftime("%Y-%m-%d-%H-%M-%S.txt")
        filepath = os.path.join(folder, filename)
        with open(filepath, "w", encoding="utf-8") as f:
            for i, q in enumerate(questions, 1):
                f.write(f"{i}. {q}\n\n")
        print(f"题目已保存到 {filepath}")