#include <WiFi.h>
#include <LiquidCrystal.h>
#include <HTTPClient.h>

const char* WIFI_SSID = "网速不太好"; // 替换为您的WiFi网络名称
const char* WIFI_PASSWORD = "sxj20020811"; // 替换为您的WiFi密码

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const int buttonPin = 34;
const int ledPin = 2;
const char* url = "http://wokwi.com/api/endpoint";  // 替换为有效的服务器URL

WiFiClient client; // WiFi网络客户端

void setup() {
  Serial.begin(115200);
  while (!Serial);
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
  lcd.begin(16, 2);

  connectToWiFi();
  lcd.print("WiFi Connected!");
}

void connectToWiFi() {
  WiFi.disconnect(true);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi Connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

// 凯撒密码加密函数
String caesarEncrypt(String text, int shift) {
  String encryptedText = "";
  for (int i = 0; i < text.length(); i++) {
    char c = text.charAt(i);
    if (isalpha(c)) {
      char base = isupper(c) ? 'A' : 'a';
      c = ((c - base + shift) % 26) + base;
    }
    encryptedText += c;
  }
  return encryptedText;
}

void loop() {
  if (digitalRead(buttonPin) == LOW) {
    performCryptographyAndSend();
  }
}

void performCryptographyAndSend() {
  lcd.clear();
  lcd.print("Button Pressed");

  String message = "Hello, World!";
  int shift = 4;
  String encryptedMessage = caesarEncrypt(message, shift);

  lcd.print("Encryption Done!");
  Serial.println("Encrypted Message: " + encryptedMessage);

  if (WiFi.status() == WL_CONNECTED) {
    sendEncryptedData(encryptedMessage);
  } else {
    Serial.println("Failed to connect to WiFi");
  }

  digitalWrite(ledPin, HIGH);
  delay(1000);
  digitalWrite(ledPin, LOW);
}

void sendEncryptedData(String encryptedData) {
  HTTPClient http;
  if (http.begin(client, url)) {
    http.addHeader("Content-Type", "text/plain");
    int httpCode = http.POST(encryptedData);
    if (httpCode > 0) {
      Serial.println("HTTP Response code: " + String(httpCode));
    } else {
      Serial.println("Error on HTTP request");
    }
    http.end();
  } else {
    Serial.println("Failed to connect to server");
  }
}