// include the library code:
#include <Arduino.h>
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
//LiquidCrystal lcd(19, 23, 18, 17, 16, 15);

// Create An LCD Object. Signals: [ RS, EN, D4, D5, D6, D7 ]
LiquidCrystal lcd(13, 12, 14, 27, 26, 25);

const int ldr = 33;   // LDR (Light Dependent Resistor)
word sensorValue;
word lastValue;
int valeur = 0;  //variable où on stock la lecture analogique
int position;   //position du potentiomètre en tant que pour cent
int last_pos = 0;
int cp = 0;

int ledState = LOW;           // current state of the output pin
int buttonState;              // current reading from the input pin
int lastButtonState = LOW;    // previous reading from the input pin
bool motionDetected = false;  // flag variable to send motion alert message
bool clearMotionAlert = true;

const int numSamples = 2; // number of samples to use for slope calculation
int samples[numSamples];  // array to store the samples

const int out23 = 23; // problème !!!
const int out32 = 32;

const int out6 = 19;
const int out5 = 18;
const int out4 = 5;
const int out3 = 4;
const int out2 = 2;
const int out1 = 15;

void setup() {
  Serial.begin(9600);
  Serial.println("Hello, ESP32!");
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("circuitschools.");

  pinMode(out23, OUTPUT); // problème !!!
  pinMode(out32, OUTPUT);

  pinMode(out6, OUTPUT);
  pinMode(out5, OUTPUT);
  pinMode(out4, OUTPUT);
  pinMode(out3, OUTPUT);
  pinMode(out2, OUTPUT);
  pinMode(out1, OUTPUT);
}
/*
  32
  435
  838
  1241
  1644
  2047
  2450
  2853
  3256
  3659
  4062
*/
int calculate_position(word val)
{
  int position = 0;
  if (val < 435)
    position = 0;
  else if (val < 838)
    position = 1;
  else if (val < 1241)
    position = 2;
  else if (val < 1644)
    position = 3;
  else if (val < 2447)
    position = 4;
  else if (val < 2853)
    position = 5;
  else if (val < 3256)
    position = 6;
  else if (val < 3659)
    position = 7;
  else if (val < 4062)
    position = 8;
  else if (val <5000)
    position = 9;
  else
    position = 10;

  return position;
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis() / 1000);
  lcd.print("   ");

  // 32 to 4063
  sensorValue = analogRead(ldr); // needs about 100 us
  delayMicroseconds(30);         // delay about 30 us
  // mets à l'échelle de 0 à 10 pour 32 à 4063
  position = map(sensorValue, 32, 4063, 0, 100);  // convertir en pourcentage

  lcd.println(position);
  lcd.setCursor(10, 1);

  samples[0] = samples[1];
  samples[1] = sensorValue; //position;

  // calculate the slope of the signal as the difference between the two samples
  int slope = samples[1] - samples[0];

  // print the slope to the serial monitor
  // Serial.print(slope);  Serial.print(",");
  Serial.print(sensorValue);  Serial.print(",");

  if (slope == 0) {
    digitalWrite(out32, HIGH);
  } else {
    digitalWrite(out32, LOW);
  }

  cp = calculate_position(sensorValue);
  Serial.print(cp);
  Serial.print(":");

  switch (cp) {
    case 0:
      digitalWrite(out6, HIGH);
      break;
    case 1:
      digitalWrite(out5, HIGH);
      break;
    case 2:
      digitalWrite(out4, HIGH);
      break;
    case 3:
      digitalWrite(out3, HIGH);
      break;
    case 4:
      digitalWrite(out2, HIGH);
      break;
    case 5:
      digitalWrite(out1, HIGH);
      break;
    default:
      Serial.print("Sensor error");
  }
  digitalWrite(out6, LOW);
  digitalWrite(out5, LOW);
  digitalWrite(out4, LOW);
  digitalWrite(out3, LOW);
  digitalWrite(out2, LOW);
  digitalWrite(out1, LOW);




  delay(500); // this speeds up the simulation


  // if (position == last_pos) {
  //   digitalWrite(out23, HIGH);
  //   // Serial.print(position);
  //   // Serial.print(" == ");
  //   // Serial.println(last_pos);
  //   motionDetected = false;
  // } else {
  //   digitalWrite(out23, LOW);
  //   // Serial.print(position);
  //   // Serial.print(" <> ");
  //   // Serial.println(last_pos);
  //   motionDetected = true;
  // }
  // if (clearMotionAlert != motionDetected) {
  //   Serial.print(motionDetected);
  // }
  // clearMotionAlert = motionDetected;
  // last_pos = position;

  // Set The Cursor Position To: [ Col 5, Row 1]
  // The Next Message Will Start From The 6th Char Position in The 2nd Row
  // Note: 1st Row Has An Index of 0, The 2nd Row Has An Index of 1
}

/*
  void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  }

  void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  }
*/