/*
 * To reverse blinking pattern, press and hold button until message is displayed on standard output
 */

#include <stdio.h>
#include <stdlib.h>
#include "pico/stdlib.h"
 
#define LED_PIN 1
#define BTN_PIN 17

bool control(int state, int interval, bool *reverse) {
  gpio_put(LED_PIN, state);
  sleep_ms(interval);
  if(gpio_get(BTN_PIN)) {
    *reverse = !(*reverse);
    return true;
  }
  return false;
}

void blink(int minute, int times, int *count, bool *reverse) {
  printf("Blinking LED %d times in minute %d\n", times, minute);
  int interval = 60000 / (times * 2);
  for(int i = 0; i < times; i++) {
    if(control(1, interval, reverse) || control(0, interval, reverse)) {
      return;
    }
  }
  (*count)++;
}

int main() {
  stdio_init_all();
  gpio_init(LED_PIN);
  gpio_set_dir(LED_PIN, GPIO_OUT);
  gpio_init(BTN_PIN);
  gpio_set_dir(BTN_PIN, GPIO_IN);
  bool reverse = false;
  int count = 0;
  int minute[] = {1, 2, 3}, times[] = {10, 20, 30}, rtimes[] = {30, 20, 10};
  if(sizeof(minute) > sizeof(times) || sizeof(minute) > sizeof(rtimes)) {
    printf("Pattern error. Exiting...");
    return EXIT_FAILURE;
  }
  while(1) {
    if(reverse) {
      blink(minute[count], rtimes[count], &count, &reverse);
    }
    else {
      blink(minute[count], times[count], &count, &reverse);
    }
    if(count == sizeof(minute) / sizeof(minute[0])) {
      count = 0;
    }
  }
  return EXIT_SUCCESS;
}