#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"
#include "driver/spi_master.h"
#include "driver/adc.h"
#include "esp_adc_cal.h"
#include "driver/gpio.h"
#include "math.h"
#include "string.h"


#define SPI_MOSI 23
#define SPI_SCLK 18
#define SPI_CS 5
#define NLSF595 4
#define TEMP ADC1_CHANNEL_3


spi_device_handle_t handle;


void ADC_init()
{
    adc1_config_width(ADC_WIDTH_BIT_10); //cuantos bits se leeran 
    adc1_config_channel_atten(TEMP, ADC_ATTEN_DB_11);// atenuacion de ADC 
}

void SPI_init()
{
    esp_err_t error;

    spi_bus_config_t buscfg = {
        .mosi_io_num = SPI_MOSI,
        .miso_io_num = -1,
        .sclk_io_num = SPI_SCLK,
        .max_transfer_sz = 1,
        .quadhd_io_num = -1,
        .quadwp_io_num = -1,
    };

    spi_device_interface_config_t devcfg = {
        .mode = 0,
        .clock_speed_hz = SPI_CLK_SRC_DEFAULT,
        .spics_io_num = SPI_CS, 
        .queue_size = 1,
    };

    error = spi_bus_initialize(SPI2_HOST, &buscfg, SPI_DMA_CH_AUTO);
    ESP_ERROR_CHECK(error);
    error = spi_bus_add_device(SPI2_HOST, &devcfg, &handle);
    ESP_ERROR_CHECK(error);
}

//NLSF595 write

void write_NLSF595(uint8_t data)
{
    
    spi_transaction_t t;

    memset(&t, 0, sizeof(t)); //give memory
    t.length = 8; //1 byte
    t.tx_buffer = &data; // data
    spi_device_polling_transmit(handle, &t);

    gpio_set_level(NLSF595, 1);
    gpio_set_level(NLSF595, 0);

}

//SET RGB

void set_rgb(float celsius, float tiempo_pasado)
{
    uint8_t color = 0b11111111;
    //led1
    if (celsius > 60)
      color &= ~(1); //00000001 rojo
    else if(celsius<60 && celsius >=30)
      color &= ~(5);//00000101 purpura
    else if(celsius <30 && celsius >=0)
      color &= ~(3);//00000011 amarillo
    else if(celsius < 0)
      color &= ~(4);//00000100 azul

    //led2
    if(celsius > tiempo_pasado)    
      color &= ~(3<<3); //00110000 amarillo
    else if(celsius < tiempo_pasado)
      color &= ~(4<<3); //00100000 azul
    else if(celsius == tiempo_pasado)
      color &= ~(2<<3); //00010000 verde
    
    write_NLSF595(color);
}

//TEMPERATURE read 
void read_temperature()
{
  static float tiempo_pasado = 0;
  const float BETA = 3950; // should match the Beta Coefficient of the thermistor
  int analogValue = adc1_get_raw(TEMP);
  float celsius = 1 / (log(1 / (1024.0 / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  printf("%1f°C\n", celsius);

  set_rgb(celsius, tiempo_pasado);
  tiempo_pasado = celsius;

}


void app_main() {
  ADC_init();
  SPI_init();
  gpio_set_direction(NLSF595, GPIO_MODE_OUTPUT);
  while (1) 
  {
    
    read_temperature();
    vTaskDelay(pdMS_TO_TICKS(1000));
  }
}