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

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

#define LED   38
#define switchPin1 47
#define switchPin2 21

#define NTP_SERVER     "pool.ntp.org"
#define UTC_OFFSET     0
#define UTC_OFFSET_DST 0

// 定义 Wi-Fi 名与密码
const char *ssid = "Wokwi-GUEST";
const char *password = "";
bool connected = false;

volatile bool flag_connectwifi = false;
volatile bool flag_wifiap = false;


void spinner();
void printLocalTime();
void setLcd();

// 定义外部中断函数
void handle_interrupt1()
{
  flag_connectwifi = true;
}
void handle_interrupt2()
{
  flag_wifiap = true;
}

void setup()
{
  delay(10);

  Serial.begin(9600);

  pinMode(switchPin1, INPUT_PULLUP);
  pinMode(switchPin2, INPUT_PULLUP);

  pinMode(LED, OUTPUT);

  // 配置中断引脚
  attachInterrupt(digitalPinToInterrupt(switchPin1), handle_interrupt1, FALLING);
  attachInterrupt(digitalPinToInterrupt(switchPin2), handle_interrupt2, FALLING);

  setLcd();
}

void loop()
{
  connect2WiFi();

delay(1000);
  createWiFiAP();
delay(1000);
  if (connected) printLocalTime();
}



void setLcd()
{
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Waitting WiFi...");
}

void spinner() {
  static int8_t counter = 0;
  const char* glyphs = "\xa1\xa5\xdb";
  LCD.setCursor(15, 1);
  LCD.print(glyphs[counter++]);
  if (counter == strlen(glyphs)) {
    counter = 0;
  }
}

void printLocalTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    LCD.setCursor(0, 1);
    LCD.println("Connection Err");
    return;
  }

  LCD.setCursor(8, 0);
  LCD.println(&timeinfo, "%H:%M:%S");

  LCD.setCursor(0, 1);
  LCD.println(&timeinfo, "%d/%m/%Y   %Z");
}

void connect2WiFi()
{
  Serial.println((String)"switchPin1:"+digitalRead(switchPin1));
  if (flag_connectwifi && digitalRead(switchPin1) == LOW)
  {
    Serial.println((String)"switchPin1 low:"+digitalRead(switchPin1));

  }
  else if (flag_connectwifi && digitalRead(switchPin1) == HIGH)
  {
    LCD.setCursor(0, 0);
    LCD.print("Connecting...");
    LCD.setCursor(0, 1);
    LCD.print("WiFi ");

    // 断开之前的连接
    WiFi.disconnect(true);
    // 连接 Wi-Fi
    WiFi.begin(ssid, password);

    Serial.print("正在连接");

    // 检测是否链接成功
    while (WiFi.status() != WL_CONNECTED) {
      spinner();
      delay(500);
      Serial.print("-");
    }
    Serial.println("连接成功");
    Serial.print("IP: ");
    Serial.println(WiFi.localIP());

    LCD.clear();
    LCD.setCursor(0, 0);
    LCD.println("Online");
    LCD.setCursor(0, 1);
    LCD.println("Updating time...");

    configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);

    connected = true;
    flag_connectwifi = false;

    // 使用板载 LED 反馈连接成功
    pinMode(LED, OUTPUT);    
    digitalWrite(LED, HIGH);

    // delay(100);
    // digitalWrite(LED, LOW);
    // delay(100);
  }
}

void createWiFiAP()
{
  Serial.println((String)"switchPin2:"+digitalRead(switchPin2));
  if (flag_wifiap && digitalRead(switchPin2) == HIGH)
  {
    // 创建热点
    WiFi.softAP(ssid, password);

    //  打印热点 IP
    Serial.print("Wi-Fi 接入的 IP：");
    Serial.println(WiFi.softAPIP());

    // 重置中断标志位
    flag_wifiap = false;
  }
}