import { Doc, DocListCast } from '../../fields/Doc';
import { List } from '../../fields/List';
import { StrCast } from '../../fields/Types';
import { AudioField, ImageField, PdfField, VideoField } from '../../fields/URLField';
import { Docs, DocumentOptions } from './Documents';

/**
 * Changes the field key in the doc's layout string to be the specified field
 */
export function ResetLayoutFieldKey(doc: Doc, fieldKey: string) {
    doc.layout = StrCast(doc.layout).replace(/={'.*'}/, `={'${fieldKey}'}`);
    return doc;
}
/**
 * Creates a new document based on the type of (and containing the) data in the specified field of an existing document.
 * If the field contains a list, then it may be useful to specify a classProto to indicate the type of
 * collection Doc that gets created.
 * @param target document to retrive field from
 * @param fieldKey field key to retrieve
 * @param classProto optionally a class proto to set on the new document
 * @param options metadata configuration for new document
 * @returns
 */
export function DocumentFromField(target: Doc, fieldKey: string, classProto?: Doc, options?: DocumentOptions): Doc | undefined {
    const field = target[fieldKey];
    const resolved = options ?? {};
    const nonDocFieldToDoc = () => {
        if (field instanceof ImageField) return Docs.Create.ImageDocument(field.url.href, resolved);
        if (field instanceof VideoField) return Docs.Create.VideoDocument(field.url.href, resolved);
        if (field instanceof PdfField) return Docs.Create.PdfDocument(field.url.href, resolved);
        if (field instanceof AudioField) return Docs.Create.AudioDocument(field.url.href, resolved);
        if (field instanceof List && field[0] instanceof Doc) return Docs.Create.StackingDocument(DocListCast(field), resolved);
        return Docs.Create.TextDocument('', { ...{ _width: 200, _height: 25, _layout_autoHeight: true }, ...resolved });
    };
    const created = field instanceof Doc ? field : ResetLayoutFieldKey(nonDocFieldToDoc(), fieldKey);
    created.title = fieldKey;
    classProto && created.proto && (created.proto = classProto);
    return created;
}