#include "pico/stdlib.h"

#define LED_PIN 21
#define BUTTON_PIN 20

// Global mode: false = normal, true = reversed
bool reverse_mode = false;

// Please keep the button pressed for 1-2 seconds
// Function to detect button press and toggle state
void check_button_toggle() {
    static bool last_button_state = 1;
    bool current_state = gpio_get(BUTTON_PIN);

    if (last_button_state && !current_state) {
        reverse_mode = !reverse_mode;
        sleep_ms(200); // Debounce delay
    }

    last_button_state = current_state;
}

// Blinks the LED with button check between each blink
void blink_with_button_check(int times, int delay_ms) {
    for (int i = 0; i < times; i++) {
        gpio_put(LED_PIN, 1);
        sleep_ms(delay_ms / 2);
        check_button_toggle();  // Check button mid-blink
        gpio_put(LED_PIN, 0);
        sleep_ms(delay_ms / 2);
        check_button_toggle();  // Check button after blink
        if (reverse_mode != (times == 10)) break;  // React immediately if mode changed
    }
}

int main() {
    stdio_init_all();

    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);

    while (1) {
        if (!reverse_mode) {
            blink_with_button_check(10, 3000);
            blink_with_button_check(20, 1500);
            blink_with_button_check(30, 1000);
        } else {
            blink_with_button_check(30, 1000);
            blink_with_button_check(20, 1500);
            blink_with_button_check(10, 3000);
        }
    }
}