const fs = require("fs");

// 保存题目和答案到txt文件，但仅当题目不存在时保存
function saveToFile(data) {
    try {
        const existingData = readFromFile(); // Read existing data
        const newData = { ...existingData, ...data }; // Merge existing and new data
        fs.writeFileSync("questions.txt", JSON.stringify(newData), "utf-8");
        console.log("Data saved to questions.txt");
    } catch (error) {
        console.error("Error saving data:", error);
    }
}

// 从txt文件中读取题目和答案
function readFromFile(question) {
    try {
        const data = fs.readFileSync("questions.txt", "utf-8");
        const savedData = JSON.parse(data);
        if (question) {
            return savedData[question] || "Question not found";
        } else {
            return savedData;
        }
    } catch (error) {
        console.error("Error reading file:", error);
        return {};
    }
}
module.exports = { saveToFile, readFromFile };