import { useCallback, useEffect, useState } from 'react';
import { useOptionalPublicFormService } from '../services/PublicFormService';

export type PublicQuestionnaireRead = 'loading' | 'ready' | 'failed';

/**
 * The questionnaires that are public forms, published or not.
 *
 * A public form is website content, so it is never offered to assign to a patient. Until this read has
 * answered nothing can be offered, because an unknown form may be a public one.
 */
export const usePublicQuestionnaireIds = (enabled = true) => {
    const service = useOptionalPublicFormService();
    const [ids, setIds] = useState<Set<string>>(() => new Set());
    const [read, setRead] = useState<PublicQuestionnaireRead>('loading');

    const load = useCallback(async () => {
        if (!service) {
            setRead('failed');
            return;
        }
        setRead('loading');
        try {
            const forms = await service.listPublicForms();
            setIds(new Set(forms.map((form) => form.questionnaireId).filter((id): id is string => Boolean(id))));
            setRead('ready');
        } catch (error) {
            console.error('Could not read which forms are public:', error);
            setRead('failed');
        }
    }, [service]);

    useEffect(() => {
        if (enabled) void load();
    }, [enabled, load]);

    return { publicIds: ids, publicRead: read, retryPublicRead: load };
};