/**
 * Joining a proposal to the form it opens into.
 *
 * The overlay wants three bands of fields; a proposal carries a kind and whatever the note filled in. This
 * is the one line between them, kept apart from both so the catalogue stays a description of the forms and
 * the composer stays ignorant of what a proposal is.
 */

import { composeRecordForm, noteMayFill, type ComposedField } from './composeRecordForm';
import { fieldsForKind } from './recordFieldCatalogue.generated';
import type { RecordProposal } from './recordProposals';

/**
 * The composed form for a proposal, or nothing when its kind has no form to compose from.
 *
 * NOTHING IS NOT AN EMPTY FORM, and the difference is the whole reason this returns `undefined` rather
 * than `[]`. A referral has no resource form yet - falling back to an empty list would open an overlay
 * with a working Save button and no fields, which files an item nobody described. The caller has to say
 * what happens instead.
 */
export const composeProposalForm = (proposal: RecordProposal): ComposedField[] | undefined => {
    const fields = fieldsForKind(proposal.kind);
    if (!fields) return undefined;
    // What the note may not fill (a vaccine's source) is not taken from it, so it is owed rather than answered.
    const fromNote = Object.fromEntries(Object.entries(proposal.prefilled)
        .filter(([name]) => fields.find((field) => field.name === name && !noteMayFill(field)) === undefined));
    return composeRecordForm(fields, fromNote);
};