// main.cpp

#include "mbed.h"

#define MAXIMUM_BUFFER_SIZE 32

class Led {
private:
    DigitalOut led;
    Ticker ticker;
    float period;

public:
    Led(PinName pin) : led(pin), period(1.0) {
        led = 0;
    }
    
    void setBlinkPeriod(float period) {
        this->period = period;
        ticker.detach();
        if (period > 0) {
            auto us = std::chrono::microseconds(static_cast<long long>(period * 1000000));
            ticker.attach(callback(this, &Led::tickerHandler), us);
        }
    }
    
    void tickerHandler() {
        led = !led;
    }
};

int main() {
    Led myLed(LED1);
    static BufferedSerial serial_port(USBTX, USBRX);
    
    serial_port.set_baud(9600);
    serial_port.set_format(8, BufferedSerial::None, 1);
    
    char buf[MAXIMUM_BUFFER_SIZE] = {0};
    char msg[] = "Zadaj cislicu 0-9:\r\n";
    serial_port.write(msg, sizeof(msg));
    
    while(1) {
        if (uint32_t num = serial_port.read(buf, sizeof(buf))) {
            char c = buf[0];
            
            if (c >= '0' && c <= '9') {
                int digit = c - '0';
                float newPeriod = (float)digit;
                
                myLed.setBlinkPeriod(newPeriod);
                
                serial_port.write(buf, num);
            }
        }
        
        ThisThread::sleep_for(150ms);
    }
}