#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_log.h"

#define LED_GREEN_GPIO    GPIO_NUM_7
#define LED_YELLOW_GPIO   GPIO_NUM_6
#define LED_BLUE_GPIO     GPIO_NUM_5
#define LED_WHITE_GPIO    GPIO_NUM_4

#define BUTTON_GREEN_GPIO GPIO_NUM_1
#define BUTTON_YELLOW_GPIO GPIO_NUM_2

#define DEBOUNCE_DELAY_MS 50

static const char *TAG = "4bit_counter";


static void update_leds(uint8_t counter)
{
    // Update LEDs to represent 4-bit counter value in binary
    gpio_set_level(LED_GREEN_GPIO, (counter >> 0) & 0x01);
    gpio_set_level(LED_YELLOW_GPIO, (counter >> 1) & 0x01);
    gpio_set_level(LED_BLUE_GPIO, (counter >> 2) & 0x01);
    gpio_set_level(LED_WHITE_GPIO, (counter >> 3) & 0x01);
}

void app_main(void)
{
    

    uint8_t counter = 0;
    update_leds(counter);

    int last_button_green_state = 1;
    int last_button_yellow_state = 1;

    while (1)
    {
        int button_green_state = gpio_get_level(BUTTON_GREEN_GPIO);
        int button_yellow_state = gpio_get_level(BUTTON_YELLOW_GPIO);

        // Check green button (increment)
        if (last_button_green_state == 1 && button_green_state == 0)
        {
            // Button pressed
            counter = (counter + 1) & 0x0F; // 4-bit wrap-around
            ESP_LOGI(TAG, "Incremented counter: %d", counter);
            update_leds(counter);
            vTaskDelay(pdMS_TO_TICKS(DEBOUNCE_DELAY_MS));
        }
        last_button_green_state = button_green_state;

        // Check yellow button (decrement)
        if (last_button_yellow_state == 1 && button_yellow_state == 0)
        {
            // Button pressed
            counter = (counter - 1) & 0x0F; // 4-bit wrap-around
            ESP_LOGI(TAG, "Decremented counter: %d", counter);
            update_leds(counter);
            vTaskDelay(pdMS_TO_TICKS(DEBOUNCE_DELAY_MS));
        }
        last_button_yellow_state = button_yellow_state;

        vTaskDelay(pdMS_TO_TICKS(10)); // Polling interval
    }
}