#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>

// 设定 I2C 液晶屏的地址和大小
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27, 16, 2);

const char* ssid = "Wokwi-GUEST";  //  WiFi 热点名称
const char* password = "";  //  WiFi 密码

void encrypt(String &text) {
  for (int i = 0; i < text.length(); i++) {
    text[i] = (char) (text[i] + 3);
  }
}

void decrypt(String &text) {
  for (int i = 0; i < text.length(); i++) {
    text[i] = (char) (text[i] - 3);
  }
}

void setup() {
  // 初始化串行通信
  Serial.begin(115200);
  // 初始化液晶屏
  lcd.init();
  // 设置光标位置
  lcd.setCursor(0, 0);
  // 显示欢迎信息
  lcd.print("Hello LBL!");

  // 连接到 WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status()!= WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  if (Serial.available()) {
    // 读取串行数据
    String input = Serial.readStringUntil('\n');

    String encrypted = input;
    encrypt(encrypted);

    String decrypted = encrypted;
    decrypt(decrypted);

    lcd.setCursor(0, 0);
    lcd.print("jiami: " + encrypted);

    lcd.setCursor(0, 1);
    lcd.print("jiemi: " + decrypted);

    // 回显输入数据到串行监视器
    Serial.println(input);
  }


  delay(100); // 稍微延时以减少 CPU 占用
}