type Props = {
    duration?: number;
    count: number;
};

const useSlider = ({ duration = 0, count }: Props) => {
    // states

    const sliderTimer = ref<NodeJS.Timeout | null>(null);
    const progressTimer = ref<NodeJS.Timeout | null>(null);

    const progress = ref(0);
    const activeSlide = ref(0);

    // methods

    const slideTo = (index: number) => {
        activeSlide.value = index;
        restartSliderTimer();
    };

    const nextSlide = () => {
        if (activeSlide.value > count - 2) {
            activeSlide.value = 0;
        } else {
            activeSlide.value = activeSlide.value + 1;
        }
    };

    const prevSlide = () => {
        if (activeSlide.value < 1) {
            activeSlide.value = count - 1;
        } else {
            activeSlide.value = activeSlide.value - 1;
        }
    };

    const prevSlideHandler = () => {
        restartSliderTimer();
        runProgress();
        prevSlide();
    };

    const nextSlideHandler = () => {
        restartSliderTimer();
        runProgress();
        nextSlide();
    };

    const runProgress = () => {
        const delay = duration / 100;

        if (progressTimer.value) clearInterval(progressTimer.value);
        progress.value = 0;

        progressTimer.value = setInterval(() => {
            if (progress.value < 100) {
                progress.value = progress.value + 1;
            }
        }, delay);
    };

    const restartSliderTimer = () => {
        if (sliderTimer.value) clearInterval(sliderTimer.value);
        runProgress();

        if (duration > 0) {
            sliderTimer.value = setInterval(() => {
                runProgress();
                nextSlide();
            }, duration);
        }
    };

    onMounted(() => {
        restartSliderTimer();
    });

    onUnmounted(() => {
        restartSliderTimer();
    });

    return {
        activeSlide,
        progress,
        slideTo,
        nextSlide: nextSlideHandler,
        prevSlide: prevSlideHandler,
        restart: restartSliderTimer,
    };
};

export default useSlider;