import { Attachment } from 'fhir/r4';
import { assetUrl } from './assetUrl';

/** The mark the server sets on bytes it read back from a clean malware scan. No write can add or keep it falsely. */
export const SCANNED_THUMBNAIL_URL = 'https://akashichealthrecords.com/fhir/StructureDefinition/scanned-thumbnail';

export const isScannedPhoto = (photo?: Attachment | null): boolean =>
    Boolean(photo?.data && photo.extension?.some((extension) => extension.url === SCANNED_THUMBNAIL_URL));

/**
 * A photo or logo's inline bytes as an image source, only when the server put them there from a clean scan. Bytes a
 * browser wrote before scanning, or a link to an image elsewhere, are never drawn.
 */
export const scannedPhotoSrc = (photo?: Attachment | null): string | undefined =>
    isScannedPhoto(photo) ? `data:${photo?.contentType ?? 'image/png'};base64,${photo?.data}` : undefined;

export const getFhirPhotoUrl = (photo?: Attachment | null, type?: string): string => {

    const scanned = scannedPhotoSrc(photo);
    if (scanned) {
        return scanned;
    }

    const defaultImages: Record<string, string> = {
        practitioner: assetUrl('default_avatar.png'),
        healthcareService: assetUrl('default_avatar.png'),
        patient: assetUrl('default_avatar.png'),
        organization: assetUrl('hospital.jpg')
    };

    if (!type) {
        return defaultImages['practitioner'];
    }

    return defaultImages[type] ?? defaultImages['practitioner'];
};