Aash

int main()
{
    static enum State {disabled, enabled, waitingSecondPress,
            powerIndicator_LED, powerIndicator_PAUSE} state = disabled;
    enableRed();
    static int button = readButtonPressPin(); // assuming 0 = LOW 1 = HIGH
    static int buttonEdgeTrigger = 1;
    static int buttonState = 1;
    static unsigned long int timeStamp;

    int powerLevel = 0; // 0, 1, 2, 3 - highest
    int countLED = 0;
    while(1){
        // Edge Trigger //
        if (button == 0) {
            buttonState = 0;
        } else if(buttonState == 0) {
            buttonEdgeTrigger = 0;
            buttonState = 1;
        }
        // Edge Trigger //

        switch(state){
            case disabled:
                if (buttonEdgeTrigger == 0) {
                    state = enabled;
                    DisableRed();
                    EnableGreen();
                    buttonEdgeTrigger = 1;
                }
                break;
            case enabled:
                if (buttonEdgeTrigger == 0) {
                    state = waitingSecondPress;
                    buttonEdgeTrigger = 1;
                    timeStamp = GetCurrentMillis();
                }
                break;
            case waitingSecondPress:
                if (buttonEdgeTrigger == 0) {
                    state = powerIndicator_PAUSE;
                    disableGreen();
                    timeStamp = GetCurrentMillis();
                } else if ((GetCurrentMillis() - timeStamp) > 50) {
                    state = disabled;
                    DisableGreen();
                    EnableRed();
                }
                break;
            case powerIndicator_PAUSE:
                if ((GetCurrentMillis - timeStamp) > 500) {
                    timeStamp = GetCurrentMillis();
                    if (countLED <= powerLevel) {
                        countLED++;
                        EnableGreen();
                        state = powerIndicator_LED;
                        timeStamp = GetCurrentMillis();
                    } else {
                        EnableRed();
                        countLED = 0;
                        state = disabled;
                    }
                }
                break;
            case powerIndicator_LED:
                if ((GetCurrentMillis - timeStamp) > 250) {
                    DisableGreen();
                    state = powerIndicator_PAUSE;
                    timeStamp = GetCurrentMillis();
                }
                break;
        }
    }


    return 0;
}

EnableGreen();
DisableGreen();

EnableRed();
DisableRed();

int readButtonPressPin() {
    // TODO:
    return 0;
}

unsigned long int GetCurrentMillis() {
    //TODO:
    return 1;
}