#include <Wire.h> // I2C程式庫
#include <LiquidCrystal_I2C.h> // LCD_I2C模組程式庫
LiquidCrystal_I2C lcd(0x27, 16, 2); 
int led1 = 2;         
int led2= 3;
int led3= 4;
int led4= 5;
int led5= 6;
int button1 = 8;          
int button2 = 9;
int button3 = 10;
int button4 = 11;
int button5 = 12;
static int score=0;
char difficulty;
int num=0;
unsigned long playtime=0;
#define t 1000

void print_time(unsigned long time_millis);

void setup() {
  Serial.begin(9600);
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(led3,OUTPUT);
  pinMode(led4 ,OUTPUT);
  pinMode(led5 ,OUTPUT);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
  pinMode(button4, INPUT);
  pinMode(button5, INPUT);
  initial();
  lcd.init();
  lcd.backlight();
}
void initial(){
  digitalWrite(led1,LOW); 
  digitalWrite(led2,LOW); 
  digitalWrite(led3,LOW); 
  digitalWrite(led4,LOW); 
  digitalWrite(led5,LOW); 
}

void loop() {
  Serial.println("你要選什麼難度? ");
  while(1) {
      difficulty = Serial.read();
      if(difficulty == '1'){
        delay(100);
        Serial.println("低等難度");
        for(int i=1;i>0;i++){ 
            play();
            timer();
        }
      }

      if(difficulty == '2'){                      
        delay(100);    
        Serial.println("中等難度");
        for(int i=1;i>0;i++){ 
            play();
        }
      }
      if(difficulty == '3'){
        delay(100); 
        Serial.println("高等難度");
        for(int i=1;i>0;i++){ 
            play();
        }
      }
      if(difficulty == '4'){
        delay(100); 
        Serial.println("漸進模式");
        for(int i=1;i>0;i++){ 
            play();
        }
      }
  }
}
void play(){
  int a = random(2,7);     //隨機選取五個LED之一發亮
  digitalWrite(a, HIGH); 

  unsigned long time = millis(); 
  while( millis()-time < 3000){    // 三秒換一次LED發亮  
    num = digitalRead(a+6);
    if(num){
     break;
    }
   delay(10);
  }
  
  if(num){
      score++;
  }else{
      score--;
  }
  digitalWrite(a, LOW);
  lcd.setCursor(4, 0); // (colum, row)從第一排的第三個位置開始顯示
  lcd.print("Score: "); 
  lcd.setCursor(10, 0); // (colum,row)從第一排第三格位置開始顯示
  lcd.print(score);
}
void timer(){
  if(millis() > playtime + t){
        playtime = millis();
        print_time(playtime);
        Serial.println();
  }
}
void print_time(unsigned long time_millis){
  lcd.setCursor(4, 1); // (colum, row)從第二排的第五個位置開始顯示
  lcd.print("Time: "); 
  lcd.setCursor(9, 1); // (colum, row)從第二排的第十個位置開始顯示
  lcd.print(60-time_millis/1000);
  lcd.setCursor(11, 1); // (colum, row)從第二排的第十二個位置開始顯示
  lcd.print("s");
}