#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <dht11.h>
#include <BH1750.h>
#include <Servo.h>

#define DHT11_PIN 7
#define photoL1 A0
#define photoL2 A1
#define photoL3 A2
#define photoL4 A3
#define button 3
#define buzzer 6
#define circleServoPin 10
#define tiltServoPin 9
#define LED 4 //define the pin of LED as D10

#define TILT_ANGLE_FLAT 0
#define TILT_ANGLE_MAX  170

#define TURN_L3 180
#define TURN_L4 90
#define TURN_L1 0

#define SERVO_STEP  5

byte m_speed = 10;
BH1750 lightMeter;
dht11 DHT;
volatile int buttonState;
volatile int lightReadL1 = 0; // EAST FACING
volatile int lightReadL2 = 0; // NORTH FACING
volatile int lightReadL3 = 0; // WEST FACING
volatile int lightReadL4 = 0; // SOUTH FACING
int value;
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo circleServo;
Servo tiltServo;
int tiltPos;
int circlePos;

void setup()
{
  Serial.begin(9600);
  Serial.println("");
  Serial.print("setting up!\n");

  Serial.print("init lcd\n");
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  lcd.printstr("setting up!");
  //lcd.setCursor(0,1);
  //lcd.printstr("hey,human!");

  pinMode(LED, OUTPUT); //initialize digital pin LED as an output.
  pinMode(button, INPUT);
  pinMode(buzzer, OUTPUT);

  circleServo.attach(circleServoPin);
  circleServo.write(TURN_L4);
  Serial.print("circle pos: ");
  Serial.print(TURN_L4);
  Serial.println("");
  delay(1000);
  
  tiltServo.attach(tiltServoPin);
  tiltServo.write(0);
  Serial.print("tilt pos: ");
  Serial.print(TILT_ANGLE_FLAT);
  Serial.println("");
  delay(1000);

  if (false) {
  circleServo.write(TURN_L3);
  delay(1000);
  circleServo.write(TURN_L1);
  delay(1000);
  circleServo.write(TURN_L4);
  delay(1000);
  
  for (tiltPos = TILT_ANGLE_FLAT; tiltPos < TILT_ANGLE_MAX; tiltPos += SERVO_STEP) {
    tiltServo.write(tiltPos);
    Serial.print("tilt pos: ");
    Serial.print(tiltPos);
    Serial.println("");
    delay(m_speed);
  }
  }

  Serial.print("done setting up!\n");
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.printstr("done");

  //Intialize the 12C bus
  Wire.begin();
  //On esp8266 you can select SCL and SDA pins using Wire.begin
  //For Wemos /Lolin D1 Mini Pro and the Ambient Light shield use
  lightMeter.begin();
  Serial.println(F("BH1750 Test begin"));
}

long long count = 0;
void loop()
{
  char buf[40];
  
  //lcd.clear();
  //lcd.setCursor(0,0);

  sprintf(buf, "count: %d\n", count);
  Serial.print(buf);
  //lcd.printstr(buf);

  count++;
}



int CtoF(int temp)
{
  return temp * 1.8 + 32;
}

int FtoC(int temp)
{
  return (temp - 32) * 0.55555;
}

void old_loop()
{
  int chk;
  chk = DHT.read(DHT11_PIN);
  switch (chk)
  {
    case DHTLIB_OK:
      break;
    case DHTLIB_ERROR_CHECKSUM:
      Serial.println("[ERR] dht11 checksum");
      break;
    case DHTLIB_ERROR_TIMEOUT:
      Serial.println("[ERR] dht11 timeout");
      break;
    default:
      break;
  }

  float lux = lightMeter.readLightLevel();
  lightReadL1 = analogRead(photoL1);
  lightReadL2 = analogRead(photoL2);
  lightReadL3 = analogRead(photoL3);
  lightReadL4 = analogRead(photoL4);
  {
    char buf[40];
    char lStr[6];
    dtostrf(lux, 4, 2, lStr);  // https://forum.arduino.cc/t/sprintf-with-float-values/937562
    sprintf(buf, "h: %d%%, t: %dF, l: %s, ", DHT.humidity, CtoF(DHT.temperature), lStr);
    Serial.print(buf);

    sprintf(buf, "L1: %d, L2: %d, L3: %d, L4: %d", lightReadL1, lightReadL2, lightReadL3, lightReadL4);
    Serial.println(buf);

    lcd.clear();
    // the LCD has two rows and 17 columns ...
    sprintf(buf, "h:%d,t:%d,l:%s", DHT.humidity, CtoF(DHT.temperature), lStr);
    lcd.setCursor(0,0);
    lcd.printstr(buf);

    sprintf(buf, "%d,%d,%d,%d", lightReadL1, lightReadL2, lightReadL3, lightReadL4);
    lcd.setCursor(0,1);
    lcd.printstr(buf);
  }
  delay(2000);

  buttonState = digitalRead(button);
  if(buttonState == 0) {
      analogWrite (LED, HIGH);
  } else {
    digitalWrite(LED, LOW);
  }
}

void blink()
{
  digitalWrite(LED,HIGH);  //turn the LED on (HIGH is the voltage level
  delay(1000);  //wait for a second
  digitalWrite(LED,LOW);  //turn the LED off by making the voltage LOW
  delay(1000);  //wait for a second
}