#include <adc-meas.h>
#include <stm32f4xx.h>
#include <stm32-gpio-macros.h>

static float pt1000_offset;
static float pt1000_sens_dev;
static bool calibration_active;
static float filter_alpha;
static float pt1000_adc_raw_lf;
static bool streaming_active;
static volatile bool filter_ready;
static volatile enum adc_p1000_error pt1000_error;


#define ADC_TO_RES(adc) ((float)(adc) / 4096.0f * 2500.0f)

void adc_pt1000_setup_meas()
{
	RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
	RCC->AHB1ENR |= ADC_PT1000_PORT_RCC_MASK;
	ADC_PT1000_PORT->MODER |= ANALOG(ADC_PT1000_PIN);

}

void adc_pt1000_set_moving_average_filter_param(float alpha)
{
	filter_alpha = alpha;
}

void adc_pt1000_set_resistance_calibration(float offset, float sensitivity_deviation, bool active)
{
	pt1000_offset = offset;
	pt1000_sens_dev = sensitivity_deviation;
	calibration_active = active;
}

void adc_pt1000_get_resistance_calibration(float *offset, float *sensitivity_deviation, bool *active)
{
	if (!offset || !sensitivity_deviation || !active)
		return;

	*offset = pt1000_offset;
	*sensitivity_deviation = pt1000_sens_dev;
	*active = calibration_active;
}

int adc_pt1000_get_current_resistance(float *resistance)
{
	int ret_val = 0;

	if (!resistance)
		return -1001;

	if (calibration_active)
		*resistance = ADC_TO_RES(pt1000_adc_raw_lf) * (1 + pt1000_sens_dev) + pt1000_offset;
	else
		*resistance = ADC_TO_RES(pt1000_adc_raw_lf);

	if (adc_pt1000_check_error()) {
		ret_val = -100;
		goto return_value;
	}

	if (streaming_active) {
		ret_val = 1;
		goto return_value;
	}
	if (!filter_ready)
	{
		ret_val = 2;
	}

return_value:
	return ret_val;
}

int adc_pt1000_stream_raw_value_to_memory(uint16_t *adc_array, uint32_t length, volatile uint8_t *flag_to_set)
{

}

void adc_pt1000_convert_raw_value_array_to_resistance(float *resistance_dest, uint16_t *raw_source, uint32_t count)
{

}

enum adc_p1000_error adc_pt1000_check_error()
{
	return pt1000_error;
}

void adc_pt1000_clear_error()
{
	pt1000_error = ADC_PT1000_NO_ERR;
}

static void adc_pt1000_filter(uint16_t adc_value)
{
	pt1000_adc_raw_lf = (1-filter_alpha) * pt1000_adc_raw_lf + filter_alpha * (float)adc_value;
}

void ADC_IRQHandler(void)
{
	uint32_t adc1_sr;

	adc1_sr = ADC1->SR;
	if (ADC1->SR & ADC_SR_EOC) {
		ADC1->SR &= ~ADC_SR_EOC;
		adc_pt1000_filter(ADC1->DR);
	}

	if (adc1_sr & ADC_SR_OVR) {
		ADC1->SR &= ~ADC_SR_OVR;
		pt1000_error = ADC_PT1000_OVERFLOW;
		/* Disable ADC  in case of overrrun*/
		ADC1->CR2 &= ADC_CR2_ADON;
	}

	if (adc1_sr & ADC_SR_AWD) {
		ADC1->SR &= ~ADC_SR_AWD;
		pt1000_error = ADC_PT1000_WATCHDOG_ERROR;
	}
}