#include "pico/stdlib.h"
#include "hardware/gpio.h"

#define LED_PIN 26
#define BUTTON_PIN 15

volatile bool reverse_blinking = false;

void irq_callback(uint gpio, uint32_t events) {
    reverse_blinking = !reverse_blinking;
}

void blink_led(int times, uint delay_ms) {
    for (int i = 0; i < times; i++) {
        gpio_put(LED_PIN, 1);
        sleep_ms(delay_ms);
        gpio_put(LED_PIN, 0);
        sleep_ms(delay_ms);
    }
}

int main() {
    gpio_init(LED_PIN);
    gpio_set_dir(LED_PIN, GPIO_OUT);

    gpio_init(BUTTON_PIN);
    gpio_set_dir(BUTTON_PIN, GPIO_IN);
    gpio_pull_up(BUTTON_PIN);
    gpio_set_irq_enabled_with_callback(BUTTON_PIN, GPIO_IRQ_EDGE_FALL, true, &irq_callback);

    absolute_time_t start_time = get_absolute_time();
    bool should_blink = true;
    int blink_count = 0;

    while (true) {
        absolute_time_t current_time = get_absolute_time();
        long elapsed_minutes = absolute_time_diff_us(start_time, current_time) / 60000000;

        if (!reverse_blinking) {
          if (elapsed_minutes < 1) {
            if (should_blink) {
              blink_led(10, 1000);
              blink_count += 10;
              should_blink = false;
            }
          } else if (elapsed_minutes < 2) {
            if (should_blink) {
              blink_led(20, 1000);
              blink_count += 20;
              should_blink = false;
            }
          } else if (elapsed_minutes < 3) {
            if (should_blink) {
              blink_led(30, 1000);
              blink_count += 30;
              should_blink = false;
            }
          } else {
                break;
            }
        } else {
            if (elapsed_minutes < 1) {
              if (should_blink) {
                blink_led(30, 1000);
                blink_count += 30;
                should_blink = false;
                }            
          } else if (elapsed_minutes < 2) {
              if (should_blink) {
                blink_led(20, 1000);
                blink_count += 20;
                should_blink = false;
                }
          } else if (elapsed_minutes < 3) {
              if (should_blink) {
                blink_led(10, 1000);
                blink_count += 10;
                should_blink = false;
                }
            } else {
                break;
            }
        }
    }

    return 0;
}