#include <stdio.h>
#include "pico/stdlib.h"

#define BUTTON_A_PIN 5
#define LED_RED_PIN 13
#define DEBOUNCE_TIME_MS 200
#define TIMES_TO_PRESS 5

volatile uint8_t button_count = 0;
volatile bool blinking = false;
volatile uint8_t blink_iterations = 0;
volatile uint8_t blinking_frequency = 10;
volatile absolute_time_t last_press_time = 0;

struct repeating_timer blink_timer;

bool led_blink_callback(struct repeating_timer *t)
{
    blink_iterations++;

    gpio_xor_mask(1u << LED_RED_PIN);

    if (blink_iterations >= 100)
    {
        gpio_put(LED_RED_PIN, 0);
        blinking = false;
        blink_iterations = 0;
        return false;
    }
    return true;
}

void button_callback(uint gpio, uint32_t events)
{
    absolute_time_t current_time = get_absolute_time();

    if (!blinking && absolute_time_diff_us(last_press_time, current_time) > DEBOUNCE_TIME_MS * 1000)
    {
        last_press_time = current_time;
        button_count++;
        printf("Button A pressed %d times.\n", button_count);
    }
}

void setup_gpios()
{
    stdio_init_all();
    sleep_ms(1000);

    gpio_init(BUTTON_A_PIN);
    gpio_set_dir(BUTTON_A_PIN, GPIO_IN);
    gpio_pull_up(BUTTON_A_PIN);

    gpio_init(LED_RED_PIN);
    gpio_set_dir(LED_RED_PIN, GPIO_OUT);
    gpio_put(LED_RED_PIN, 0);

    gpio_set_irq_enabled_with_callback(BUTTON_A_PIN, GPIO_IRQ_EDGE_FALL, true, &button_callback);
}

int main()
{
    setup_gpios();

    while (true)
    {
        if (button_count >= TIMES_TO_PRESS && !blinking)
        {
            blinking = true;
            button_count = 0;
            blink_iterations = 0;

            printf("Blinking red led on 10Hz for 10 secs...\n");

            add_repeating_timer_ms(1000 / blinking_frequency, led_blink_callback, NULL, &blink_timer);
        }
        sleep_ms(10);
    }

    return 0;
}