/* Hello Wokwi! */
#include <LiquidCrystal_I2C.h>
unsigned long Hour,Minute,Second,disH,disM,disS,alaH,alaM,alaS,alaF;

LiquidCrystal_I2C lcd(0x27, 20, 4);

void disClock();//显示时间函数
void setTime();//设置时间函数
void setAlarm();//设置闹钟函数

void setup() //初始化
{
  pinMode(9, INPUT_PULLUP);//四按钮
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
  pinMode(12, INPUT_PULLUP);
  pinMode(13, OUTPUT);//LED闹钟

  Serial.begin(9600);;
  Hour=Minute=Second=alaH=alaM=alaS=alaF=0;//初始时间设为0

  lcd.init();//设置表面
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("fuck");
}

void loop() //循环
{
  if(!digitalRead(9))//按下设置闹钟按钮
  {
    alaF+=1;
  }

  if(alaF%2)//根据当前状态设置时间或设置闹钟
  {
    setAlarm();
  }else{
    alaF=0;
    setTime();
    disClock();
  }
  
  delay(200);
}


void setTime()  //设置时间
{
  int h,m;//进位标志
  if(!digitalRead(10))  //按下按钮相应变量加一
  { 
    Second+=1;
  }else if(!digitalRead(11)){
    Minute+=1; 
  }else if(!digitalRead(12)){
    Hour+=1;
  }

  disS=(Second+millis() / 1000)%60; //计算时间
  m=(Second+millis() / 1000)/60;
  disM=(Minute+m)%60;
  h=(Minute+m)/60;
  disH=(Hour+h)%24;

  if(disH==alaH&&disM==alaM&&disS==alaS)  //达到闹钟时间灯亮
  {
    digitalWrite(13, HIGH);
  }
}

void disClock() //输出时间
{
  lcd.setCursor(5, 1);
  lcd.print(disH);
  lcd.print(":");
  lcd.print(disM);
  lcd.print(":");
  lcd.print(disS);
  lcd.print("   ");
}

void setAlarm() //闹钟
{
  digitalWrite(13, LOW);  //灭灯
  lcd.setCursor(5, 1);
  lcd.print(alaH);
  lcd.print(":");
  lcd.print(alaM);
  lcd.print(":");
  lcd.print(alaS);
  lcd.print("  ");
  if(!digitalRead(10))  //按下按钮设置闹钟
  {
    alaS+=1;
    if(alaS>=60)alaS=0;
  }else if(!digitalRead(11)){
    alaM+=1; 
    if(alaM>=60)alaM=0;
  }else if(!digitalRead(12)){
    alaH+=1;
    if(alaH>=24)alaH=0;
  }
}