#include <Arduino.h>
#include <Preferences.h>
#include <IRremote.h>   // Use "IRremote" library, not IRremoteESP8266

// --- Pins ---
#define PIR_PIN    2   // PIR motion sensor
#define LDR_PIN    1   // LDR module A0 → GPIO1 (ADC)
#define IR_LED_PIN 3   // IR LED pin

// --- Config values (persistent) ---
int ldrThreshold;
unsigned long candleTimeout;
unsigned long lastMotionTime = 0;

Preferences prefs;

// --- Replace with your candle remote codes ---
uint32_t CANDLE_ON_CODE  = 0xFFA25D;
uint32_t CANDLE_OFF_CODE = 0xFFE21D;
const int IR_BITS = 32; // NEC codes are 32 bits

// --- Load/Save Settings ---
void loadSettings() {
  prefs.begin("candle", true);
  ldrThreshold   = prefs.getInt("ldrThreshold", 2000);
  candleTimeout  = prefs.getULong("candleTimeout", 10000UL); // 10s default
  prefs.end();
}

void saveSettings() {
  prefs.begin("candle", false);
  prefs.putInt("ldrThreshold", ldrThreshold);
  prefs.putULong("candleTimeout", candleTimeout);
  prefs.end();
}

// --- Setup ---
void setup() {
  Serial.begin(115200);
  pinMode(PIR_PIN, INPUT);

  // Init IR sender
  IrSender.begin(IR_LED_PIN, ENABLE_LED_FEEDBACK); 

  // Load saved settings
  loadSettings();

  Serial.println("🌙 IR Night Motion Candle Ready!");
  Serial.print("Loaded Timeout: "); Serial.print(candleTimeout / 1000); Serial.println(" sec");
  Serial.print("Loaded LDR Threshold: "); Serial.println(ldrThreshold);
  Serial.println("Commands:");
  Serial.println("  T <seconds>   → set candle timeout");
  Serial.println("  L <value>     → set LDR threshold (0–4095)");
  Serial.println("  S             → show current settings");
}

// --- Loop ---
void loop() {
  // --- Handle Serial Commands ---
  if (Serial.available() > 0) {
    String input = Serial.readStringUntil('\n');
    input.trim();
    if (input.length() > 0) {
      char cmd = toupper(input.charAt(0));
      if (cmd == 'T') {
        int val = input.substring(1).toInt();
        if (val > 0) {
          candleTimeout = val * 1000UL;
          saveSettings();
          Serial.print("⏱️ Timeout set to: ");
          Serial.print(val);
          Serial.println(" sec (saved)");
        }
      } else if (cmd == 'L') {
        int val = input.substring(1).toInt();
        if (val >= 0 && val <= 4095) {
          ldrThreshold = val;
          saveSettings();
          Serial.print("🌑 LDR threshold set to: ");
          Serial.print(val);
          Serial.println(" (saved)");
        }
      } else if (cmd == 'S') {
        Serial.println("📋 Current Settings:");
        Serial.print("  Timeout: "); Serial.print(candleTimeout / 1000); Serial.println(" sec");
        Serial.print("  LDR Threshold: "); Serial.println(ldrThreshold);
      } else {
        Serial.println("⚠️ Unknown command. Use T <sec>, L <val>, or S");
      }
    }
  }

  // --- Sensor Check ---
  int ldrValue = analogRead(LDR_PIN);
  int motion   = digitalRead(PIR_PIN);

  Serial.print("LDR: "); Serial.print(ldrValue);
  Serial.print(" | Thr: "); Serial.print(ldrThreshold);
  Serial.print(" | Motion: "); Serial.println(motion);

  // Night + Motion → send ON
  if (ldrValue < ldrThreshold && motion == HIGH) {
    lastMotionTime = millis();
    Serial.println("🌙 Motion + Night → IR Candle ON");
    IrSender.sendNEC(CANDLE_ON_CODE, IR_BITS);
  }

  // Timeout expired → send OFF
  if ((millis() - lastMotionTime > candleTimeout) && lastMotionTime > 0) {
    Serial.println("⏱️ Timeout expired → IR Candle OFF");
    IrSender.sendNEC(CANDLE_OFF_CODE, IR_BITS);
    lastMotionTime = 0; // prevent repeat spam
  }

  delay(200);
}