class JokeService {

    constructor(categories = ['programming', 'coding', 'development'], lang = 'en') {
        this.categories = Array.isArray(categories) ? categories : [categories];
        this.lang = lang;
        this.apiBaseUrl = 'https://v2.jokeapi.dev/joke/'
    }

    setCategory(category) {
        this.categories = Array.isArray(category) ? category : [category];
    }

    tell() {
        let service = this;

        axios.get(
            service.apiBaseUrl + service.categories.join(',') + '?lang=' + service.lang
        ).then((response) => {
            if (response.data.error === false) {
                service.show(response.data);
            }
        }).catch((error) => {
            console.error(error);
        });
    }

    show(joke) {
        if (joke.type === 'twopart') {
            setTimeout(() => {
                showNotification(joke.delivery)
            }, 4000);

            showNotification(joke.setup);
        } else {
            showNotification(joke.joke);
        }
    }
}

function showNotification(text) {
    if (Notification.permission === 'granted') {
        new Notification('', {
            body: text
        });
    } else {
        console.warn('Notifications sind nicht erlaubt.')
    }
}