#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"

// Pin definitions
#define BUTTON_PIN 4 // Button connected to GPIO 4
uint8_t led_pins[] = {38, 37, 36, 35, 0, 45, 48, 47}; // LED pins

// Function declarations
int readPinStateWithDebounce(int pin);
void writeToPins(uint8_t pins[], uint8_t val);
void printBin8(uint8_t val);

void app_main() {
    // Configure button pin as input
    gpio_set_direction(BUTTON_PIN, GPIO_MODE_INPUT);
    gpio_set_pull_mode(BUTTON_PIN, GPIO_PULLUP_ONLY);

    // Configure LED pins as output
    for (int i = 0; i < 8; i++) {
        gpio_set_direction(led_pins[i], GPIO_MODE_OUTPUT);
    }

    uint8_t counter = 0; // Binary counter variable

    while (1) {
        int btnState = readPinStateWithDebounce(BUTTON_PIN);

        if (btnState == 0) { // Button is pressed
            counter++; // Increment the counter
            writeToPins(led_pins, counter); // Display on LEDs
            printBin8(counter); // Print binary value to serial monitor
            vTaskDelay(pdMS_TO_TICKS(200)); // Debounce delay
        }
    }
}


/* Function Name -readPinstateWithdebounce

* Description - This function reads the 

* Return type -

* Parameters - -

*/
/* Function to debounce and read button state */
int readPinStateWithDebounce(int pin) {
    int btnState = gpio_get_level(pin);
    
    if (btnState == 0) { // Button pressed
        vTaskDelay(pdMS_TO_TICKS(50)); // Debounce delay
        int newState = gpio_get_level(pin);
        
        if (newState == 0) { // Still pressed
            printf("Button Pressed\n");
            return 0;
        }
    }
    
    printf("waiting to be pressed\n");
    return 1; // Default state (not pressed)
}

/* Function Name -

* Description -

* Return type -

* Parameters - -

*/
/* Function to write binary value to LED pins */
void writeToPins(uint8_t pins[], uint8_t val) {
    for (int i = 0; i < 8; i++) {
        int bit = (val >> i) & 1; // Extract bit value
        gpio_set_level(pins[i], bit); // Write to corresponding LED pin
    }
}


/* Function Name -

* Description -

* Return type -

* Parameters - -

*/
/* Function to print binary representation of val */
void printBin8(uint8_t val) {
    printf("Binary Count: ");
    for (int i = 7; i >= 0; i--) { // Print MSB to LSB
        printf("%d", (val >> i) & 1);
    }
    printf("\n");
}