import type { Goal } from 'fhir/r4';
import { ORGANIZATION_TAG_SYSTEM } from './carePlanAuthorship';
import { createdAtOrganization } from './createdAtOrganization';

export interface GoalPractice {
    /** Written at a practice other than the reader's, so it is shown and not editable here. */
    fromAnotherPractice: boolean;
    /** That practice's name, when the record carries one. */
    practiceName?: string;
}

/**
 * Where a goal was written, against the practice the reader is acting in.
 *
 * A goal is changed by whoever created it. The practice that created it is the goal's
 * `createdAtOrganization`, falling back to its organization tag when that tag is unambiguous. A goal
 * the patient set is theirs wherever it was stamped, so it is never "from another practice". When the
 * owner or the reader's practice cannot be told, it is not claimed either, as with care plans.
 */
export const goalPractice = (
    goal: Goal | undefined,
    context: { patientId?: string; currentOrganizationId?: string },
): GoalPractice => {
    const origin = createdAtOrganization(goal);
    const tags = (goal?.meta?.tag ?? []).filter((tag) => tag.system === ORGANIZATION_TAG_SYSTEM && tag.code);
    const owner = origin.id ?? (tags.length === 1 ? tags[0].code : undefined);
    // The server writes `Organization/<id>` as the display when it could not read the name.
    const practiceName = origin.name && !origin.name.startsWith('Organization/') ? origin.name : undefined;

    const patientSetIt = Boolean(context.patientId)
        && goal?.expressedBy?.reference === `Patient/${context.patientId}`;

    return {
        fromAnotherPractice: !patientSetIt
            && Boolean(owner && context.currentOrganizationId && owner !== context.currentOrganizationId),
        ...(practiceName ? { practiceName } : {}),
    };
};