/* Hello Wokwi! */

#include <LiquidCrystal_I2C.h>
#define alarm A0  //闹钟
#define add    A1  //加
#define minus  A2  //减
#define choose  A3//选择端口
const int buzzerPin=10;//蜂鸣器

LiquidCrystal_I2C lcd(0x27, 20, 4);

unsigned long seconds;
int isecond = 0, iminute = 0, ihour = 0, iday = 0, imonth = 0, iyear = 0; //初始时间
int psecond = 0, pminute = 0, phour = 0, pday = 0, pmonth = 0, pyear = 0; //当前时间
int s = 0, m = 0, h = 0, d = 0, mon = 0, y = 0; //时间进位
int count=0,ButtonDelay=10,alarm_count = 0 ,frequence = 2093;
int alarm_hour = 10, alarm_minute = 1, alarm_second = 0;  //闹钟时间
void setup()
{
 lcd.begin(16, 2);
 lcd.backlight();
 lcd.setCursor(6, 1); lcd.print(":");
 lcd.setCursor(9, 1); lcd.print(":");
 lcd.setCursor(7, 0); lcd.print('/');
 lcd.setCursor(10, 0); lcd.print('/');
 digitalWrite(add,HIGH);
 digitalWrite(minus,HIGH);
 digitalWrite(choose, HIGH);
 digitalWrite(alarm, HIGH);
 pinMode(buzzerPin, OUTPUT);
 setTime(2022,8,28,10,00,00); //设置初始时间
}
void setTime(int y, int mon, int d, int h, int m, int s)
{
 iyear = y;
 imonth = mon;
 iday = d;
 ihour = h;
 iminute = m;
 isecond = s;
}
void Format(int col, int row,int num) 
{
 lcd.setCursor(col, row);
 if(num <=9) lcd.print("0");
 lcd.print(num);
}
void Time() 
{ 
 psecond = ( isecond + seconds ) % 60; 
 m = ( isecond + seconds ) / 60;
 Format(10,1,psecond);
 pminute = ( iminute + m ) % 60;
 h = ( iminute + m ) / 60;
 Format(7,1,pminute);  
 phour = (ihour + h ) % 24;
 d = ( ihour + h ) / 24;
 Format(4,1,phour);
}
int YearMonth_Days(int year, int month) 
{
 int days = 0;
 if (month != 2)
 {
  switch (month)
  {
   case 1: case 3: case 5: case 7: case 8: case 10: case 12: days = 31; break;
   case 4: case 6: case 9: case 11: days = 30; break;
  }
 }
 else
 {
 if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)  days = 29;
 else  days = 28; 
 }
 return days;
}
void Day() 
{ 
 int days = YearMonth_Days(pyear,pmonth);
 int days_up;
 if( pmonth == 1 ) 
   days_up = YearMonth_Days( pyear - 1, 12 );
 else 
   days_up = YearMonth_Days( pyear, pmonth - 1 );
 pday = ( iday + d ) % days;
 if( pday == 0 ) 
   pday = days; 
 if( ( iday + d ) == days + 1 )
 {
  iday -= days;
  mon++;
 }
 if(( iday + d ) == 0)
 {
  iday += days_up;
  mon--;
 }
 Format(11,0,pday);
}
void Month() 
{
 pmonth = ( imonth + mon ) % 12;
 if( pmonth == 0 ) pmonth = 12;
   y = ( imonth + mon - 1) / 12;
 Format(8,0,pmonth);
}
void Year()  
{
 pyear = ( iyear + y ) % 9999;
 if( pyear == 0 ) pyear = 9999;
  lcd.setCursor(3, 0);
 lcd.print(pyear);
}
void show() 
{
 Time();
 Day();
 Month();
 Year();
 lcd.setCursor(6, 1); lcd.print(":");
 lcd.setCursor(9, 1); lcd.print(":");
 lcd.setCursor(7, 0); lcd.print('-');
 lcd.setCursor(10, 0); lcd.print('-');
}
void Cursor(int col,int row)
{
  lcd.setCursor(col,row);
  lcd.cursor();
  delay(100);
  lcd.noCursor();
  delay(100);
}
void set_time(int col, int row, int &Time){
   Cursor(col, row); 
   if(digitalRead(add) == LOW){
        delay(ButtonDelay);
        if(digitalRead(add) == LOW){
            Time ++;
        }           
        show();      
   }  
   if(digitalRead(minus) == LOW){
        delay(ButtonDelay);
        if(digitalRead(minus) == LOW){
            Time --; 
        }           
        show();  
    }  
}
void set_clock(){
    if(digitalRead(choose)==LOW){     
        lcd.setCursor(13, 1);  lcd.print("set");
        while(1){       
            if(digitalRead(choose)==LOW){
                delay(ButtonDelay);
                if(digitalRead(choose)==LOW){
                    count++;  
                }             
            } 
            seconds = millis()/1000; 
            show(); 
            if(count == 1){
                set_time(5, 1, ihour);      //SetHour
            }else if(count == 2){ 
                set_time(8, 1, iminute);    //SetMinute
            }else if(count == 3){
                set_time(11, 1, isecond);    //SetSecond
            }else if(count == 4){
                set_time(12, 0, iday);       //SetDay
            }else if(count == 5){
                set_time(9, 0, imonth);    // SetMonth
            }else if(count == 6){           
                set_time(6, 0, iyear);      //SetYear
            }else if(count >= 7){
                count = 0; 
                lcd.clear();
                break;
            }
        }
    }  
}
void set_alarm_hour(){
   Cursor(5, 1);   
   if(digitalRead(add) == LOW){
       delay(ButtonDelay);
       if(digitalRead(add) == LOW){
           alarm_hour ++;
           if(alarm_hour == 24){
               alarm_hour = 0;
           }   
           Format(4,1,alarm_hour);   
       }
   }
    if(digitalRead(minus) == LOW){
            delay(ButtonDelay);
            if(digitalRead(minus) == LOW){                
                alarm_hour --;
                if(alarm_hour == -1){
                    alarm_hour = 23;
                }   
                Format(4,1,alarm_hour); 
            }
    }
}
void set_alarm_minute(){
   Cursor(8, 1); 
   if(digitalRead(add) == LOW) {
       delay(ButtonDelay);
       if(digitalRead(add) == LOW){
            alarm_minute ++;
            if(alarm_minute == 60){
                alarm_minute = 0;
            }  
            Format(7,1,alarm_minute); 
       }
   }
    if(digitalRead(minus) == LOW){
            delay(ButtonDelay);
            if(digitalRead(minus) == LOW){                
                alarm_minute --;
                if(alarm_minute == -1){
                    alarm_minute = 59;
                }  
                Format(7,1,alarm_minute); 
            } 
    }  
}
void set_alarm(){
    if(digitalRead(alarm) == LOW){
        //lcd.clear();
        alarm_hour = phour;
        alarm_minute = pminute;
        lcd.setCursor(0, 0);   
        lcd.print("   set  alarm   ");  
        lcd.setCursor(10, 1);   
        lcd.print("00");         //闹钟秒数      
        while(1){
            if(digitalRead(choose) == LOW){
                delay(ButtonDelay);
                if(digitalRead(choose) == LOW){
                    alarm_count++; 
                }                    
            }  
            if(alarm_count == 1){
                set_alarm_hour();
            }else if(alarm_count == 2){
                set_alarm_minute();        
            }else if(alarm_count >= 3){
                alarm_count = 0;
                break;
            }       
        }
    }
} 
void Clock_Alarm(){
  if(phour == alarm_hour && pminute == alarm_minute && psecond == alarm_second){
        tone(buzzerPin,frequence); 
        delay(5000);
        noTone(buzzerPin);   
  }
} 
void loop()
{ 
 seconds = millis()/1000; 
 show();
 set_clock();
 set_alarm(); 
 Clock_Alarm();
 Clock_Alarm();
}