//version ovs17 с фонариком на красную и SOS на зелёную кнопку
#define inputPinRed 2
#define inputPinGreen 3
#define inputPinBlue 4

#define outputPinRed 9
#define outputPinGreen 10
#define outputPinBlue 11

#define longDelay 600
#define shortDelay 300
#define blinkOffDelay 200
#define wordsSpaceDelay 300
#define betweenSosDelay 1000

int dutyCycleRed = 0;
int dutyCycleGreen = 0;
int dutyCycleBlue = 0;

int upDutyCycleRed = 0;
int upDutyCycleGreen = 0;
int upDutyCycleBlue = 0;

int buttonPressedRed = 0;
int buttonPressedGreen = 0;
int buttonPressedBlue = 0;

void setup()
{
    pinMode(inputPinRed, INPUT);
    pinMode(inputPinGreen, INPUT);
    pinMode(inputPinBlue, INPUT);

    pinMode(outputPinRed, OUTPUT);
    pinMode(outputPinGreen, OUTPUT);
    pinMode(outputPinBlue, OUTPUT);

    if (digitalRead(inputPinRed) == LOW) lantern();
    else if (digitalRead(inputPinGreen) == LOW) sos();
    else normalMode();
}

void normalMode()
{
    lightsOff();
    for(;;)
    {
        checkButtons();
        changeDutyCycles();
        delay(200);
    }
}

void sos()
{
    lightsOff();
    for(;;)
    {
        blink(shortDelay);
        delay(wordsSpaceDelay);

        blink(longDelay);
        delay(wordsSpaceDelay);

        blink(shortDelay);
        delay(betweenSosDelay);
    }
}

void blink(int length)
{
    for(int i = 0; i < 3; i++)
        {
            delay(blinkOffDelay);
            lightsOn();
            delay(length);
            lightsOff();
        }
}

void lightsOn()
{
    analogWrite(outputPinRed, 0);
    analogWrite(outputPinBlue, 0);
    analogWrite(outputPinGreen, 0);
}

void lightsOff()
{
    analogWrite(outputPinRed, 255);
    analogWrite(outputPinBlue, 255);
    analogWrite(outputPinGreen, 255);
}

void lantern()
{
    for(;;);
}

void loop()
{
}

void checkButtons()
{
    checkButton(&buttonPressedRed, inputPinRed, &upDutyCycleRed);
    checkButton(&buttonPressedBlue, inputPinBlue, &upDutyCycleBlue);
    checkButton(&buttonPressedGreen, inputPinGreen, &upDutyCycleGreen);
}

void checkButton(int* buttonPressed, int inputPin, int* upDutyCycle)
{
    int buttonPressedBefore = *buttonPressed;
    *buttonPressed = digitalRead(inputPin) == LOW;
    if(!buttonPressedBefore && *buttonPressed)
        *upDutyCycle = !*upDutyCycle;
}

void changeDutyCycles()
{
    if (buttonPressedRed) changeDutyCycle(&dutyCycleRed, &upDutyCycleRed, outputPinRed);
    if (buttonPressedBlue) changeDutyCycle(&dutyCycleBlue, &upDutyCycleBlue, outputPinBlue);
    if (buttonPressedGreen) changeDutyCycle(&dutyCycleGreen, &upDutyCycleGreen, outputPinGreen);
}

void changeDutyCycle(int* dutyCycle, int* upDutyCycle, int outputPin)
{
    *dutyCycle += *upDutyCycle ? 4 : -4;
    if (*dutyCycle > 255) *dutyCycle = 255;
    if (*dutyCycle < 0) *dutyCycle = 0;
    analogWrite(outputPin, 255-*dutyCycle);
}