import type { Visit } from './anamnesis-types';
/** One rendered column. `index` is the position in the FULL visit array, so
 * the grid still reads the cell whose delta was computed there. */
export interface VisitColumn {
    key: string;
    visit: Visit;
    index: number;
}
export interface VisitWindow {
    columns: VisitColumn[];
    shownCount: number;
    totalCount: number;
    hiddenCount: number;
    /** First / last date among the SHOWN columns, in record order (never
     * re-sorted). Null when nothing is shown. */
    firstIso: string | null;
    lastIso: string | null;
}
export interface VisitWindowOptions {
    /** Ids rendered in every window and EXCLUDED from the counts — the merged
     * baseline. "Showing N of M" counts only what the picker can toggle. */
    alwaysShowIds?: Iterable<string>;
}
/** The selection the picker opens on: every visit, in record order. Empty
 * on an empty record. Also the export's fallback when a host passed no
 * selection, so a file with no mirrored picker matches the on-screen default. */
export declare function defaultSelectedVisitIds(visits: readonly Visit[]): string[];
/** Resolve which visit columns render, in RECORD order — never in the order
 * the reader happened to tick them. Safe on an empty record, a single-visit
 * record, same-date visits and out-of-order visits. */
export declare function windowVisits(visits: readonly Visit[], selectedIds: Iterable<string>, options?: VisitWindowOptions): VisitWindow;
/** Every visit as its own column — the unwindowed default. */
export declare function allVisitColumns(visits: readonly Visit[]): VisitColumn[];
/** Whether the picker has more than one visit to offer. With one visit it is
 * chrome the clinician has to read and cannot use, so the toolbar leaves it
 * out entirely. */
export declare function visitPickerIsUseful(visits: readonly Visit[]): boolean;
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