#include <Arduino.h>

// ===================== 引脚定义（严格匹配你的电路）=====================
#define RGB_R     5       // RGB红灯
#define RGB_G     15      // RGB绿灯
#define RGB_B     2       // RGB蓝灯
#define KEY       23      // 按键
#define PIR       27      // PIR红外人体感应
#define LDR       4       // 光敏电阻
#define BUZZER    25      // 蜂鸣器

// ===================== 系统状态 =====================
bool defensing = false;    // 布防状态
bool alarming = false;    // 报警状态

// 报警闪烁变量
unsigned long previousMillis = 0;
const long interval = 500;
bool ledState = false;

// ===================== 绿灯呼吸灯（布防状态）=====================
void greenBreath() {
  static int brightness = 0;
  static int step = 4;

  if (defensing) {
    brightness += step;
    if (brightness > 255 || brightness < 0) step = -step;
    analogWrite(RGB_G, brightness);
    
    digitalWrite(RGB_R, LOW);
    digitalWrite(RGB_B, LOW);
    dacWrite(BUZZER, 0);
  } else {
    analogWrite(RGB_G, 0);
  }
}

// ===================== 报警灯光 + 蜂鸣器 =====================
void alarmBlink() {
  unsigned long currentMillis = millis();
  
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    ledState = !ledState;

    if (ledState) {
      digitalWrite(RGB_R, HIGH);
      digitalWrite(RGB_B, LOW);
      dacWrite(BUZZER, 180);
    } else {
      digitalWrite(RGB_R, LOW);
      digitalWrite(RGB_B, HIGH);
      dacWrite(BUZZER, 0);
    }
    digitalWrite(RGB_G, LOW);
  }
}

// ===================== 初始化 =====================
void setup() {
  Serial.begin(115200);

  // 引脚模式
  pinMode(RGB_R, OUTPUT);
  pinMode(RGB_G, OUTPUT);
  pinMode(RGB_B, OUTPUT);
  pinMode(KEY, INPUT_PULLUP);
  pinMode(PIR, INPUT);
  pinMode(LDR, INPUT);
  pinMode(BUZZER, OUTPUT);

  // 初始关闭所有设备
  digitalWrite(RGB_R, LOW);
  digitalWrite(RGB_G, LOW);
  digitalWrite(RGB_B, LOW);
  dacWrite(BUZZER, 0);

  Serial.println("系统启动成功 → 等待光线触发布防");
}

// ===================== 主循环 =====================
void loop() {
  // 读取按键（按下解除报警）
  if (digitalRead(KEY) == LOW) {
    alarming = false;
    defensing = false;
    digitalWrite(RGB_R, LOW);
    digitalWrite(RGB_G, LOW);
    digitalWrite(RGB_B, LOW);
    dacWrite(BUZZER, 0);
    delay(200);
  }

  // 读取光敏值
  int lightValue = analogRead(LDR);
  
  // 光线充足 → 自动布防
  if (!defensing && lightValue > 2000) {
    defensing = true;
    alarming = false;
    Serial.println("已进入布防状态");
  }

  // PIR 触发报警
  if (defensing && digitalRead(PIR) == HIGH) {
    alarming = true;
  }

  // 状态逻辑
  if (alarming) {
    alarmBlink();
  } else {
    greenBreath();
  }

  delay(50);
}