#include "drivers/adc.h"
#include "drivers/dac.h"
#include "resources.h"
#include "stm32f030x8.h"
#include "stm32f0xx_hal_adc.h"
#include <stm32f0xx_hal.h>

using namespace stereo_mix;

Dac dacs[8];
Adc adc;

// Default interrupt handlers.
extern "C" {
void NMI_Handler() {}
void Error_Handler()
{
  while (1)
    ;
}
void HardFault_Handler()
{
  while (1)
    ;
}
void MemManage_Handler()
{
  while (1)
    ;
}
void BusFault_Handler()
{
  while (1)
    ;
}
void UsageFault_Handler()
{
  while (1)
    ;
}
void SVC_Handler() {}
void DebugMon_Handler() {}
void PendSV_Handler() {}

// called every 1ms
void SysTick_Handler()
{
  HAL_IncTick();
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
  RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };

  /** Initializes the CPU, AHB and APB busses clocks
   */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI14 | RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;
  RCC_OscInitStruct.HSI14CalibrationValue = 16;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
  RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB busses clocks
   */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
      | RCC_CLOCKTYPE_PCLK1;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
    Error_Handler();
  }
}
void DMA1_Channel1_IRQHandler(void)
{
  HAL_DMA_IRQHandler(&adc.dma);
}
void ADC1_IRQHandler(void)
{
  HAL_ADC_IRQHandler(&adc.adc);
}

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc)
{
  adc.OnDMATransferComplete();
}
}

int main(void)
{
  HAL_Init();
  SystemClock_Config();
  __HAL_RCC_SYSCFG_CLK_ENABLE();
  __HAL_RCC_PWR_CLK_ENABLE();

  dacs[0].Init(GPIOB, GPIO_PIN_8);
  dacs[1].Init(GPIOB, GPIO_PIN_9);
  dacs[2].Init(GPIOB, GPIO_PIN_10);
  dacs[3].Init(GPIOB, GPIO_PIN_11);
  dacs[4].Init(GPIOA, GPIO_PIN_8);
  dacs[5].Init(GPIOA, GPIO_PIN_9);
  dacs[6].Init(GPIOA, GPIO_PIN_10);
  dacs[7].Init(GPIOA, GPIO_PIN_11);

  adc.Init();
  while (true) {
    for (int i = 0; i < 4; i++) {
      uint32_t value_l;
      uint32_t value_r;

      uint16_t pan_pot = adc.value(ADC_GROUP_POT + i) >> (16 - 12); // adc is only 12 bit anyways
      uint16_t vol_pot = adc.value(ADC_GROUP_CV + i) >> (16 - 12);
      int16_t pan_cv = (adc.value(ADC_CHANNEL_CV_PAN_1 + i) - 32768) >> (16 - 12);
      uint16_t vol_cv = adc.value(ADC_CHANNEL_CV_VOL_1 + i) >> (16 - 12);
      int32_t pan = pan_pot + pan_cv;
      int32_t vol = vol_pot + vol_cv;

      CONSTRAIN(pan, 0, (1 << 12) - 1);
      CONSTRAIN(vol, 0, (1 << 12) - 1);

      value_l = (lut_left_sin_pan[pan] * lut_linear_to_exp[vol]) >> 16;
      value_r = (lut_right_cos_pan[pan] * lut_linear_to_exp[vol]) >> 16;

      dacs[i].Write16(0, value_r);
      dacs[i + 4].Write16(0, value_r);
      dacs[i].Write16(1, value_l);
      dacs[i + 4].Write16(1, value_l);
    }
  }
}