#include "DHTesp.h"

#define LED_PIN   2
#define SW_PIN    4
#define LDR_PIN   34
#define DHT_PIN   14

// เกณฑ์ความเสี่ยง
#define TEMP_LIMIT   32.0
#define HUM_LIMIT    70.0
#define LIGHT_LIMIT  500   // ค่าน้อย = มืด (ปรับได้)

DHTesp dht;

SystemState state = MONITOR;

// ตัวแปรปุ่ม
bool lastBtn = HIGH;
unsigned long lastPressTime = 0;
int pressCount = 0;

// ตัวแปรกระพริบ LED
unsigned long lastBlink = 0;
bool ledState = LOW;

void setup() {
  Serial.begin(115200);

  pinMode(LED_PIN, OUTPUT);
  pinMode(SW_PIN, INPUT_PULLUP);

  dht.setup(DHT_PIN, DHTesp::DHT22);

  Serial.println("System Start -> MONITOR");
}

void loop() {
  // อ่านเซนเซอร์
  TempAndHumidity data = dht.getTempAndHumidity();
  int lightValue = analogRead(LDR_PIN);

  bool hot   = data.temperature > TEMP_LIMIT;
  bool humid = data.humidity > HUM_LIMIT;
  bool dark  = lightValue < LIGHT_LIMIT;

  // ===== อ่านปุ่ม =====
  bool btn = digitalRead(SW_PIN);
  if (lastBtn == HIGH && btn == LOW) {
    pressCount++;
    lastPressTime = millis();
  }
  lastBtn = btn;

  // ===== ตรวจสถานะ =====
  switch (state) {

    // ---------------- MONITOR ----------------
    case MONITOR:
      digitalWrite(LED_PIN, LOW);

      Serial.printf("MONITOR -> T:%.1f H:%.1f Light:%d\n",
                    data.temperature, data.humidity, lightValue);

      if (hot || humid || dark) {
        state = ALERT;
        Serial.println(">>> ALERT!");
      }
      break;

    // ---------------- ALERT ----------------
    case ALERT:
      // LED กระพริบทุก 0.5 วิ
      if (millis() - lastBlink >= 500) {
        lastBlink = millis();
        ledState = !ledState;
        digitalWrite(LED_PIN, ledState);
      }

      Serial.print("ALERT! -> ");
      if (hot)   Serial.print("Hot ");
      if (humid) Serial.print("Humid ");
      if (dark)  Serial.print("Dark ");
      Serial.println();

      // กด 1 ครั้ง → CONFIRMED
      if (pressCount >= 1) {
        pressCount = 0;
        state = CONFIRMED;
        Serial.println("CONFIRMED -> Manual Warning");
      }
      break;

    // ---------------- CONFIRMED ----------------
    case CONFIRMED:
      digitalWrite(LED_PIN, HIGH);

      // กด 2 ครั้งติดกัน → RESET
      if (pressCount >= 2) {
        pressCount = 0;
        state = MONITOR;
        Serial.println("RESET -> Monitoring Again");
      }
      break;
  }

  delay(1000); // หน่วงอ่านค่า
}