#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);
unsigned int second = 0;    //初始时间-秒
unsigned int minute = 0;    //初始时间-分钟
unsigned int hour = 0;    //初始时间-小时
int timer1_counter;
String inc;   //输入的字符串
int num;      //输入的时间
int buzzerpin = 8;  //定义蜂鸣器接口
float sinVal;     //闹钟声音所需
int toneVal;      //闹钟声音所需
int flag1 = 0;    //是否已有闹钟的标志
int fHour = 1;        //闹钟时间
int fMinute = 1;      //闹钟时间
int flag2 = 0;    //闹钟响起标志
bool flag = true;  

void setup() {
  Serial.begin(9600);
  Serial.println("电子钟");
  Serial.println("输入setHour修改小时,setMinute修改分钟,setSecond修改秒");
  Serial.println("输入setAlarm设置闹钟,输入cancelAlarm取消闹钟,输出changeAlarm修改闹钟");
  Serial.println("(注意区分字母大小写！)");  
  lcd.init();
  lcd.backlight();
  lcd.setCursor(1, 0);
  lcd.println("");
  pinMode(buzzerpin, OUTPUT);

  //定时器
  noInterrupts();
  TCCR1A = 0;
  TCCR1B = 0;
  //timer1_counter = 65536-(62500*1);  //1s 定时器中断
  timer1_counter = 3036;
  TCNT1 = timer1_counter;
  TCCR1B |= (1 << CS12);
  TIMSK1 |= (1<< TOIE1);
  interrupts();

  //蜂鸣器频率设置
  for(int x = 0;x < 180;x++){
    sinVal = (sin(x*(3.1412/180)));
    toneVal = 2000 + (int(sinVal*1000));
  }
  
}

//秒+1
ISR(TIMER1_OVF_vect) {
  TCNT1 = timer1_counter;
  second++;
}

void loop() {

  simTime();    //化简时间
  showTime();   //输出时间

  //当检测到数据输入时
  if (Serial.available() > 0){
    if(changeTime() == false)   //修改时间,若没有找到相关指令
      alarm();      //在闹钟设置寻找指令
  }
  
  alarmOpen();    //打开闹钟
}

//化简时间
void simTime()
{
   if(second >= 60){
    second = second % 60;
    minute++;
  }
  if(minute >= 60){
    minute = minute % 60;
    hour++;
  }
  if(hour == 24){
    hour == 0;
  }
}

//格式化输出时间
void showTime()
{
  //格式化输出小时
  sim(4, hour);
  //格式化输出分钟
  sim(7, minute);
  //格式化输出秒
  sim(10, second);

  //时间中冒号的显示
  if (second % 2 == 1)
  {
    lcd.setCursor(6, 1);
    lcd.print(":");
    lcd.setCursor(9, 1);
    lcd.print(":");
  }
  else if (second % 2 == 0)
  {
    lcd.setCursor(6, 1);
    lcd.print(" ");
    lcd.setCursor(9, 1);
    lcd.print(" ");
  }
}

//格式化代码
void sim(int cursor, int time)
{
  lcd.setCursor(cursor, 1);
  if(time < 10){
    lcd.print(0);
    lcd.setCursor(cursor + 1, 1);
    lcd.print(time);
  }
  else
    lcd.print(time);
}

//修改时间
bool changeTime()
{
  //获取得到的字符串
  inc = Serial.readString();
  inc.trim();    //去除尾部的换行符
  if(inc == "setHour")
  {
    Serial.println("请输入小时(0-23整数)");
    while(Serial.available() == 0);  //等待输入
    inc = Serial.readString();
    inc.trim();
    if(inc.toInt() >= 0 && inc.toInt() <= 23){
      hour = inc.toInt();
      Serial.println("修改完成");
      return true;
    }
   else{
     Serial.println("输入的必须是0-23的整数");
      return true;
    }
  }
  else if(inc == "setMinute"){
    Serial.println("请输入分钟(0-59整数)");
    while(Serial.available() == 0);  //等待输入
    inc = Serial.readString();
    inc.trim();
    if(inc.toInt() >= 0 && inc.toInt() <= 59){
      minute = inc.toInt();
      Serial.println("修改完成");
      return true;
    }
    else{
      Serial.println("输入的必须是0-59的整数");
      return true;
    }
  }
  else if(inc == "setSecond"){
    Serial.println("请输入秒(0-59整数)");
    while(Serial.available() == 0);  //等待输入
    inc = Serial.readString();
    inc.trim();
    if(inc.toInt() >= 0 && inc.toInt() <= 59){
      second = inc.toInt();
      Serial.println("修改完成");
      return true;
    }
    else{
      Serial.println("输入的必须是0-59的整数");
      return true;
    }
  }
  else{
    return false;
  }
}

//闹钟设置
void alarm()
{
  //设置闹钟
  if(inc == "setAlarm" && flag1 == 0)   //指令正确且无已有闹钟
  {
    setAlarm();
  }
  else if(inc == "setAlarm" && flag1 == 1){   //指令正确且已有闹钟
    Serial.println("已有闹钟，无法重复设置！");
  }

  //取消闹钟
  else if(inc == "cancelAlarm" && flag1 == 1){  //指令正确且已有闹钟
    flag1 == 0;
  }
  else if(inc == "cancelAlarm" && flag1 == 0){  //指令正确但没有闹钟
    Serial.println("还没有设置闹钟！");
  }

  //修改闹钟
  else if(inc == "changeAlarm" && flag1 == 1){  //指令正确且已有闹钟
    setAlarm();
  }
  else if(inc == "changeAlarm" && flag1 == 0){  //指令正确但没有闹钟
    Serial.println("还没有设置闹钟！");
  }

  //关闭正在响起的闹钟指令
  else if(inc == "close" && flag1 == 1){
    flag2 = 0;
    Serial.println("闹钟已关闭");
    noTone(buzzerpin);
  }
  //其他
  else{
    Serial.println("无效指令！");
  }
}

//设置闹钟时间
void setAlarm(){
  //设置小时
  Serial.println("设置小时(0-23整数)");
  while(Serial.available() == 0); 
  inc = Serial.readString();
  inc.trim();
  if(inc.toInt() >= 0 && inc.toInt() <= 23){
    fHour = inc.toInt();
    Serial.println("小时设置成功");
  }
  else{
    Serial.println("输入的必须是0-23的整数,请重新输入指令设置闹钟");
  }
  //设置分钟
  Serial.println("设置分钟(0-59整数)");
  while(Serial.available() == 0); 
  inc = Serial.readString();
  inc.trim();
  if(inc.toInt() >= 0 && inc.toInt() <= 59){
    fMinute = inc.toInt();
    Serial.print("闹钟设置成功,时间为 ");
    Serial.print(fHour);
    Serial.print("时");
    Serial.print(fMinute);
    Serial.println("分");
    flag1 = 1;
  }
  else{
    Serial.println("输入的必须是0-59的整数,请重新输入指令设置闹钟");
  }
}

void alarmOpen(){
  if(hour == fHour && minute == fMinute && second == 0 && flag2 == 0 && flag1 == 1){  //打开闹钟
    flag2 = 1;
    Serial.println("闹钟已开,输入close关闭闹钟");
  }
    
  if(flag2)
    tone(buzzerpin,toneVal);
}