/* #include <LiquidCrystal_I2C.h>
PulseSensorPlayground pulseSensor; // Creates an instance of the PulseSensorPlayground object called "pulseSensor"
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() { 
    Serial.begin(9600); // For Serial Monitor
    lcd.begin();
    lcd.backlight();
 
    // Configure the PulseSensor object, by assigning our variables to it.
    pulseSensor.analogInput(PulseWire);
    pulseSensor.blinkOnPulse(LED13); //auto-magically blink Arduino's LED with heartbeat.
    pulseSensor.setThreshold(Threshold);
 
    // Double-check the "pulseSensor" object was created and "began" seeing a signal.
    if (pulseSensor.begin()) {
        Serial.println("We created a pulseSensor Object !"); //This prints one time at Arduino power-up, or on Arduino reset.
    }
}
 
void loop() { 
    int myBPM = pulseSensor.getBeatsPerMinute(); // Calls function on our pulseSensor object that returns BPM as an "int".
    // "myBPM" hold this BPM value now.
    if (pulseSensor.sawStartOfBeat()) { // Constantly test to see if "a beat happened".
        Serial.println("♥ A HeartBeat Happened ! "); // If test is "true", print a message "a heartbeat happened".
        Serial.print("BPM: "); // Print phrase "BPM: "
        Serial.println(myBPM); // Print the value inside of myBPM.

        lcd.setCursor(0,0);
        lcd.print("BPM: "); // Print phrase "BPM: "
        lcd.print(myBPM);
    }
    delay(50); // considered best practice in a simple sketch.
}```
*/
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

const int BUTTON1_PIN = 2;  // 按钮1的引脚
const int BUTTON2_PIN = 3;  // 按钮2的引脚
const int BUTTON3_PIN = 4;  // 按钮3的引脚
LiquidCrystal_I2C lcd(0x27, 16, 2);  // 定义LCD对象，设置I2C地址为0x27，列数为16，行数为2

void setup() {
  pinMode(BUTTON1_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  pinMode(BUTTON3_PIN, INPUT_PULLUP);
  lcd.begin(16, 2);
  lcd.backlight();
}

void display_symbol(int num) {
  if (num == 1) {
    lcd.print("Paper");
  } else if (num == 2) {
    lcd.print("Scissors");
  } else {
    lcd.print("Stone");
  }
}

void display_result(int user, int robot) {
  lcd.setCursor(0, 1);
  if (user == robot) {
    lcd.println("Draw");
  } else if ((user == 1 && robot == 3) || (user == 2 && robot == 1) || (user == 3 && robot == 2)) {
    lcd.println("Win");
  } else {
    lcd.println("Loss");
  }
}

void loop() {
  int button1State = digitalRead(BUTTON1_PIN);
  int button2State = digitalRead(BUTTON2_PIN);
  int button3State = digitalRead(BUTTON3_PIN);

  if (!(!button1State || !button2State || !button3State)) return;

  int user_input = 1;
  int robot_input = random(1, 4);  // 随机生成1到3的数字
  
  lcd.clear();  // 清除LCD屏幕
  lcd.setCursor(0, 0);
  
  if (button1State == LOW) {  // 如果按钮1被按下
    user_input = 1;
  } else if (button2State == LOW) {  // 如果按钮2被按下
    user_input = 2;
  } else if (button3State == LOW) {  // 如果按钮3被按下
    user_input = 3;
  }

  display_symbol(user_input);
  lcd.print(" VS ");
  delay(1000);
  display_symbol(robot_input);

  display_result(user_input, robot_input);
  delay(1000);

  while (!digitalRead(BUTTON1_PIN) || !digitalRead(BUTTON2_PIN) || !digitalRead(BUTTON3_PIN)) delay(10);
}