#include "main.h"

// ================= HANDLE =================
ADC_HandleTypeDef hadc1;
TIM_HandleTypeDef htim3;

// ================= VARIABLE =================
volatile uint8_t emergency_mode = 0;
uint8_t last_button_state = 1;

// ================= PARAMETER =================
#define LDR_THRESHOLD 2000
#define LED_OFF   0
#define LED_DIM   100
#define LED_FULL  1000

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

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK |
                               RCC_CLOCKTYPE_SYSCLK;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);
}

// ================= GPIO =================
void MX_GPIO_Init(void)
{
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  // PIR → PA1
  GPIO_InitStruct.Pin = GPIO_PIN_1;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // BUTTON → PB1 (interrupt + pull-up)
  GPIO_InitStruct.Pin = GPIO_PIN_1;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  // LED PWM → PA6 (TIM3 CH1)
  GPIO_InitStruct.Pin = GPIO_PIN_6;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  GPIO_InitStruct.Alternate = GPIO_AF1_TIM3;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  // Enable interrupt
  HAL_NVIC_SetPriority(EXTI0_1_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI0_1_IRQn);
}

// ================= ADC =================
void MX_ADC1_Init(void)
{
  __HAL_RCC_ADC_CLK_ENABLE();

  hadc1.Instance = ADC1;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
  hadc1.Init.ScanConvMode = ADC_SCAN_DISABLE;
  hadc1.Init.ContinuousConvMode = DISABLE;

  HAL_ADC_Init(&hadc1);

  ADC_ChannelConfTypeDef sConfig = {0};
  sConfig.Channel = ADC_CHANNEL_0;
  sConfig.Rank = ADC_REGULAR_RANK_1;
  HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}

// ================= PWM =================
void MX_TIM3_Init(void)
{
  __HAL_RCC_TIM3_CLK_ENABLE();

  htim3.Instance = TIM3;
  htim3.Init.Prescaler = 64;
  htim3.Init.Period = 1000;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;

  HAL_TIM_PWM_Init(&htim3);

  TIM_OC_InitTypeDef sConfigOC = {0};
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 0;

  HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1);
}

// ================= INTERRUPT =================
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if (GPIO_Pin == GPIO_PIN_1)
  {
    emergency_mode = !emergency_mode;
  }
}

// ================= HELPER =================
uint16_t read_LDR(void)
{
  HAL_ADC_Start(&hadc1);
  HAL_ADC_PollForConversion(&hadc1, HAL_MAX_DELAY);
  return HAL_ADC_GetValue(&hadc1);
}

void set_LED(uint16_t value)
{
  __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, value);
}

// ================= MAIN =================
int main(void)
{
  HAL_Init();
  SystemClock_Config();

  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_TIM3_Init();

  HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1);

  while (1)
  {
    // ===== FALLBACK BUTTON =====
    uint8_t current_button = HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1);

    if (last_button_state == 1 && current_button == 0)
    {
      emergency_mode = !emergency_mode;
      HAL_Delay(50);
    }

    last_button_state = current_button;

    // ===== MODE DARURAT =====
    if (emergency_mode)
    {
      set_LED(LED_OFF);
      continue;
    }

    uint16_t ldr = read_LDR();
    uint8_t pir = HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_1);

    // ===== LOGIKA UTAMA =====
    if (ldr < LDR_THRESHOLD)
    {
      // TERANG → LED MATI
      set_LED(LED_OFF);
    }
    else
    {
      // GELAP (LUX RENDAH)
      if (pir == GPIO_PIN_SET)
      {
        // ADA GERAKAN → TERANG
        set_LED(LED_FULL);
      }
      else
      {
        // TIDAK ADA GERAKAN → REDUP
        set_LED(LED_DIM);
      }
    }

    HAL_Delay(100);
  }
}