#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Button.h>
#include "driver/ledc.h"
#include "RTClib.h"
#include <stdio.h>
#include "esp_err.h"

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define Sensor_Hall 18
#define TIMER              LEDC_TIMER_0
#define MODO               LEDC_LOW_SPEED_MODE
#define PIN_SALIDA          (5) 
#define CANAL            LEDC_CHANNEL_0
#define RESOLUCION         LEDC_TIMER_13_BIT //Resolucion de 13 bits
#define DUTY               (4096)  //Duty al 50%, para detectar correctamente los pulsos
#define FRECUENCIA          (1) //Podremos variarla para modificar la velocidad de los pulsos (bicicleta)

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
RTC_DS1307 RTC;
char days[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

const int radio_rueda = 35; // en centimetros
float velocidad = 0.0; // en km/h
float distancia = 0.0; //en metros
unsigned long t1 = 0;
volatile int numero_pulsos = 0;
volatile int numero_pulsos_5seg = 0;

Button boton_res(35);

void detecta_pulso() {
    numero_pulsos++;
}

void calculos() {
  if (millis()-t1 > 5000) {
    velocidad = ((numero_pulsos-numero_pulsos_5seg)/5.0)*2*PI*(radio_rueda*0.01)*3.6;
    t1 += 5000;
    numero_pulsos_5seg = numero_pulsos;
  }
  distancia = 2*PI*(radio_rueda)*0.01*numero_pulsos;
}

static void generacion_pulsos() {
    ledc_timer_config_t timer = {
        .speed_mode       = MODO,
        .duty_resolution  = RESOLUCION,
        .timer_num        = TIMER,
        .freq_hz          = FRECUENCIA,  
        .clk_cfg          = LEDC_AUTO_CLK
    };
    ESP_ERROR_CHECK(ledc_timer_config(&timer));

    ledc_channel_config_t canal = {
        .gpio_num       = PIN_SALIDA,
        .speed_mode     = MODO,
        .channel        = CANAL,
        .intr_type      = LEDC_INTR_DISABLE,
        .timer_sel      = TIMER,
        .duty           = 0,
        .hpoint         = 0
    };
    ESP_ERROR_CHECK(ledc_channel_config(&canal));
}

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

  if (!RTC.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  RTC.adjust(DateTime(F(__DATE__), F(__TIME__)));

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3C for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  delay(1000);
  display.setTextColor(WHITE);
  display.clearDisplay();

  generacion_pulsos();
  ESP_ERROR_CHECK(ledc_set_duty(MODO, CANAL, DUTY));
  ESP_ERROR_CHECK(ledc_update_duty(MODO, CANAL));

  pinMode(Sensor_Hall, INPUT_PULLUP);
  boton_res.begin();
  attachInterrupt(digitalPinToInterrupt(Sensor_Hall), detecta_pulso, RISING);
}

void loop() {
  calculos();

  DateTime london = RTC.now();
  DateTime now(london.unixtime() + 3600); // One hour later.

    display.clearDisplay();
    display.setTextSize(1);
    display.setCursor(0, 0);
    display.print(now.day());
    display.print('/');
    display.print(now.month());
    display.print('/');
    display.print(now.year());
    display.print('-');
    display.println(days[now.dayOfTheWeek()]);
    display.println(' ');
    display.setCursor(15, 14);
    display.setTextSize(2);
    if (now.hour() < 10)
      display.print('0');
    display.print(now.hour());
    display.print(':');
    if (now.minute() < 10)
      display.print('0');
    display.print(now.minute());
    display.print(':');
    if (now.second() < 10)
      display.print('0');
    display.println(now.second());
    display.setTextSize(1.5);
    display.setCursor(0,40);
    display.print("Dist:");
    display.setCursor(0,50);
    display.print(distancia);
    display.print(" m");
    display.setCursor(60,40);
    display.println("Vel:");
    display.setCursor(60,50);
    display.print(velocidad);
    display.print(" km/h");
    display.display();

  if (boton_res.pressed()) {
      distancia = 0.0;
      numero_pulsos = 0;
      numero_pulsos_5seg = 0;
  }
  delay(50);
}