#include <stdio.h>
#include <stdlib.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/adc.h"
#include "driver/ledc.h"
#include "esp_adc_cal.h"
#include "esp_log.h"

#define POTENTIOMETER_ADC_CHANNEL ADC_CHANNEL_4   // GPIO4
#define LEDC_OUTPUT_IO 5                          // GPIO5
#define LEDC_TIMER LEDC_TIMER_0
#define LEDC_MODE LEDC_HIGH_SPEED_MODE
#define LEDC_CHANNEL LEDC_CHANNEL_0
#define LEDC_DUTY_RES LEDC_TIMER_10_BIT           // Resolução de 10 bits (0-1023)
#define LEDC_FREQUENCY 5000                       // 5 kHz

void app_main(void)
{
    // 1. Configurar o ADC
    adc_unit_t adc_unit = ADC_UNIT_1;
    adc_oneshot_unit_handle_t adc_handle;
    adc_oneshot_unit_init_cfg_t init_config = {
        .unit_id = adc_unit,
    };
    adc_oneshot_new_unit(&init_config, &adc_handle);

    adc_oneshot_chan_cfg_t channel_config = {
        .atten = ADC_ATTEN_DB_11,        // Para leitura até ~3.3V
        .bitwidth = ADC_BITWIDTH_12
    };
    adc_oneshot_config_channel(adc_handle, POTENTIOMETER_ADC_CHANNEL, &channel_config);

    // 2. Configurar PWM (LEDC)
    ledc_timer_config_t ledc_timer = {
        .speed_mode       = LEDC_MODE,
        .duty_resolution  = LEDC_DUTY_RES,
        .timer_num        = LEDC_TIMER,
        .freq_hz          = LEDC_FREQUENCY,
        .clk_cfg          = LEDC_AUTO_CLK
    };
    ledc_timer_config(&ledc_timer);

    ledc_channel_config_t ledc_channel = {
        .speed_mode     = LEDC_MODE,
        .channel        = LEDC_CHANNEL,
        .timer_sel      = LEDC_TIMER,
        .intr_type      = LEDC_INTR_DISABLE,
        .gpio_num       = LEDC_OUTPUT_IO,
        .duty           = 0,
        .hpoint         = 0
    };
    ledc_channel_config(&ledc_channel);

    while (1) {
        // 3. Ler valor do potenciômetro
        int adc_reading = 0;
        adc_oneshot_read(adc_handle, POTENTIOMETER_ADC_CHANNEL, &adc_reading);

        // 4. Converter leitura para PWM duty
        uint32_t duty = (adc_reading * 1023) / 4095;

        // 5. Atualizar PWM
        ledc_set_duty(LEDC_MODE, LEDC_CHANNEL, duty);
        ledc_update_duty(LEDC_MODE, LEDC_CHANNEL);

        printf("ADC: %d -> Duty: %d\n", adc_reading, duty);
        vTaskDelay(pdMS_TO_TICKS(100));
    }

}