/*
 * adc_ifc.c
 *
 *  Created on: Jan 17, 2023
 *      Author: Partha
 */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include "esp_log.h"
//#include "driver/adc.h"
#include "esp_adc/adc_oneshot.h"
#include "esp_adc/adc_cali.h"
#include "esp_adc/adc_cali_scheme.h"
//#include "esp_adc_cal.h"
#include "data_processing.h"
#include "hmi.h"
#include "ulp_main.h"

static const char* TAG = "ADC_IF";

#define LOG_LOCAL_LEVEL ESP_LOG_INFO

//static esp_adc_cal_characteristics_t adc1_chars;
RTC_DATA_ATTR uint32_t light_data3;
RTC_DATA_ATTR uint32_t prev_light_data3;

adc_oneshot_unit_handle_t adc1_handle;
adc_cali_handle_t adc1_cali_handle = NULL;
static int adc_raw[2];
static int voltage[2];

static bool adc_calibration_init(adc_unit_t unit, adc_atten_t atten, adc_cali_handle_t *out_handle)
{
    adc_cali_handle_t handle = NULL;
    esp_err_t ret = ESP_FAIL;
    bool calibrated = false;

#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
    if (!calibrated) {
        ESP_LOGI(TAG, "calibration scheme version is %s", "Curve Fitting");
        adc_cali_curve_fitting_config_t cali_config = {
            .unit_id = unit,
            .atten = atten,
            .bitwidth = ADC_BITWIDTH_DEFAULT,
        };
        ret = adc_cali_create_scheme_curve_fitting(&cali_config, &handle);
        if (ret == ESP_OK) {
            calibrated = true;
        }
    }
#endif

#if ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
    if (!calibrated) {
        ESP_LOGI(TAG, "calibration scheme version is %s", "Line Fitting");
        adc_cali_line_fitting_config_t cali_config = {
            .unit_id = unit,
            .atten = atten,
            .bitwidth = ADC_BITWIDTH_DEFAULT,
        };
        ret = adc_cali_create_scheme_line_fitting(&cali_config, &handle);
        if (ret == ESP_OK) {
            calibrated = true;
        }
    }
#endif

    *out_handle = handle;
    if (ret == ESP_OK) {
        ESP_LOGI(TAG, "Calibration Success");
    } else if (ret == ESP_ERR_NOT_SUPPORTED || !calibrated) {
        ESP_LOGW(TAG, "eFuse not burnt, skip software calibration");
    } else {
        ESP_LOGE(TAG, "Invalid arg or no memory");
    }

    return calibrated;
}

void adc_ifx_init(void)
{
	/*esp_adc_cal_value_t val_type = esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_DEFAULT, 0, &adc1_chars);

	//Check type of calibration value used to characterize ADC
	if (val_type == ESP_ADC_CAL_VAL_EFUSE_VREF)
	{
	    printf("ADC: eFuse Vref");
	}
	else if (val_type == ESP_ADC_CAL_VAL_EFUSE_TP)
	{
	    printf("ADC: Two Point");
	}
	else
	{
	    printf("ADC: Default");
	}
	adc1_ulp_enable();
	ESP_ERROR_CHECK(adc1_config_width(ADC_WIDTH_BIT_DEFAULT));*/

	//-------------ADC1 Init---------------//
	adc_oneshot_unit_init_cfg_t init_config1 = {
	        .unit_id = ADC_UNIT_1,
			.ulp_mode = ADC_ULP_MODE_DISABLE
	};
	ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config1, &adc1_handle));

	//-------------ADC1 Config---------------//
	adc_oneshot_chan_cfg_t config = {
	        .bitwidth = ADC_BITWIDTH_13,
	        .atten = ADC_ATTEN_DB_11,
	};
	ESP_ERROR_CHECK(adc_oneshot_config_channel(adc1_handle, ADC_CHANNEL_0, &config));
	//ESP_ERROR_CHECK(adc_oneshot_config_channel(adc1_handle, ADC_CHANNEL_1, &config));

	//-------------ADC1 Calibration Init---------------//
	if(false == adc_calibration_init(ADC_UNIT_1, ADC_ATTEN_DB_11, &adc1_cali_handle))
	{
		ESP_LOGI(TAG, "ADC Calibration NOT Supported");
	}
}

static void adc_cal_deinit(adc_cali_handle_t handle)
{
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
    ESP_LOGI(TAG, "deregister %s calibration scheme", "Curve Fitting");
    ESP_ERROR_CHECK(adc_cali_delete_scheme_curve_fitting(handle));

#elif ADC_CALI_SCHEME_LINE_FITTING_SUPPORTED
    ESP_LOGI(TAG, "deregister %s calibration scheme", "Line Fitting");
    ESP_ERROR_CHECK(adc_cali_delete_scheme_line_fitting(handle));
#endif
}

void adx_ifx_deinit(void)
{
	//adc_cal_deinit(adc1_cali_handle);
	adc_oneshot_del_unit(adc1_handle);
}

uint32_t adc_if_get_batt_mV(void)
{
	//uint32_t val = 4*esp_adc_cal_raw_to_voltage(adc1_get_raw(ADC1_CHANNEL_0), &adc1_chars);
	ESP_ERROR_CHECK(adc_oneshot_read(adc1_handle, ADC_CHANNEL_0, &adc_raw[0]));
	ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc1_cali_handle, adc_raw[0], &voltage[0]));
	return 4*voltage[0];
}

#if 0
uint32_t adc_if_get_light_mV(void)
{
	uint32_t test_val = 0;
	//uint32_t val = esp_adc_cal_raw_to_voltage(adc1_get_raw(ADC1_CHANNEL_1), &adc1_chars);
	ESP_ERROR_CHECK(adc_oneshot_read(adc1_handle, ADC_CHANNEL_1, &adc_raw[1]));
	ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc1_cali_handle, adc_raw[1], &voltage[1]));

	uint32_t val = voltage[1];

	ESP_LOGI(TAG, "Light mV: %ld", val);
	test_val = (val*255)/2504;
	//if(data_get_light_sensor_gp() && data_get_light_sensor_gn())
	{
		/*if the new light_sensor value is greater than GB_threshold or lower than GN_threshold*/
		//if((data_get_light_sensor_gn() > test_val) || (data_get_light_sensor_gp() < test_val))
		{
			/* set the prev_light_data to the previous reading */
			//ESP_ERROR_CHECK(adc_cali_raw_to_voltage(adc1_cali_handle, ulp_raw_light_data, (int *)&prev_light_data));
			//prev_light_data = ulp_light_data;
			//ulp_prev_light_data=ulp_light_data;//light_data;
			//prev_light_data = (255*prev_light_data)/2504;
			//ulp_light_data = (255*val)/2504;
			//ESP_LOGI(TAG,"LIGHT_GN  = %ld\nLIGHT_GP  = %ld",data_get_light_sensor_gn(),data_get_light_sensor_gp());
			ESP_LOGI(TAG,"Updating Prev_light_data");
			prev_light_data3 = light_data3;
			light_data3 = test_val;
			//ulp_light_data = val;
		}
	}
	return val;
}

uint32_t adc_if_get_prev_light_mV(void)
{
	return prev_light_data3;
}
#endif