/* Hello Wokwi! */

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

int ledPin = 13;   // LED connected to digital pin 13
int arr[6];
int clock[6];
int hour = 0, minute = 0, second = 0;
long temp = 1000;
int flag = 0;

void setup() {
  pinMode(ledPin, OUTPUT);   
  Serial.begin(9600);   //以9600的速率初始化串口
  lcd.init();   
  lcd.backlight();  
  lcd.setCursor(0, 0);
  for(int j = 0; j < 3; j++){arr[j] = -1; clock[j] = -1;}
  lcd.print("The clock!");
  Serial.println("请选择要进行的操作：1修改时间 2闹钟设置（后面要输入修改的时间,eg:12 13 14）");
  while(Serial.read()>= 0){}       //读入字符
  pinMode(ledPin, OUTPUT);
}

void add(){                        
  second++;
  while(second > 59 || minute > 59 || hour > 23){
    if(second > 59){
      second -= 60;
      minute++;
    }
    if(minute > 59){
      minute -= 60;
      hour++;
    }
    if(hour > 23){
      hour -= 24;
    }
  }
}

void printtime(){                 
  lcd.setCursor(3,1);
  lcd.print(hour);
  lcd.setCursor(5,1);
  lcd.print(":");
  lcd.setCursor(7,1);
  lcd.print(minute);
  lcd.setCursor(9,1);
  lcd.print(":");
  lcd.setCursor(11, 1);
  lcd.print(second);
  if(second < 10)
  {
    lcd.setCursor(12,1);
    lcd.print(" ");
  }
  if(minute < 10)
  {
    lcd.setCursor(8,1);
    lcd.print(" ");
  }
  if(hour < 10)
  {
    lcd.setCursor(4,1);
    lcd.print(" ");
  }
}

bool high(int arr[])
{
  if(arr[0] == hour && arr[1] == minute && arr[2] == second)
  {
    return true;
  }
  return false;
}
bool low(int arr[])
{
  if(arr[0] == hour && arr[1] == minute && arr[2] == second - 5)
  {
    return true;
  }
  return false;
}

bool valid(int arr[])
{
  if(arr[0] < 24 && arr[1] < 60 && arr[2] < 60 && 
  arr[0] > -1 && arr[1] > -1 && arr[2] > -1)
  {
    return true;
  }
  return false; 
}

void loop() 
{
  if(Serial.available()>0)
  {
    delay(1000);
    flag = Serial.parseInt();
    Serial.print("flag = ");
    Serial.println(flag);
  }
  if(flag == 1)
  {
    int i = 0;
    while(Serial.available()>0)
    {
      delay(1000);
      arr[i++] = Serial.parseInt();
    }
    if(valid(arr))
    {
      Serial.println("修改成功");
      flag = 0;
      hour = arr[0];
      minute = arr[1];
      second = arr[2];
      for(int j = 0; j < 3; j++){
        arr[j] = -1;
      }
    }
  }
  else if(flag == 2)
  {
    int i = 0;
    while(Serial.available()>0)
    {
      delay(1000);
      arr[i++] = Serial.parseInt();
    }
    if(valid(arr))
    {
      Serial.println("闹钟设置成功！(到时间L灯亮,5s后自动关闭)");
      flag = 0;
      for(int j = 0; j < 3; j++)
      {
        clock[j] = arr[j];
        arr[j] = -1;
      }
    }
  }
  while(Serial.read()>= 0){}
  unsigned long nowtime=millis(); //获取当前的系统运行时间长度
  if(nowtime > temp){
    add();
    temp+=1000;  //延长时间
  }
  printtime();
  if(high(clock))
  {
    digitalWrite(ledPin, HIGH); 
  }
  if(low(clock))
  {
    digitalWrite(ledPin, LOW);
  }
}