import type { SessionSummary } from './sessionIndex';

export const SESSION_INDEX_MANIFEST = 'sessionIndex';

export const SESSION_INDEX_SCHEMA_VERSION = 2;

export const PARENT_INDEX_NAME = 'byParent';

export interface SessionWorkspaceCounts {
  readonly active: number;
  readonly archived: number;
}

export function sessionCollection(generation: number): string {
  return `session:g${generation}`;
}

export function sessionCountersCollection(generation: number): string {
  return `sessionCounters:g${generation}`;
}

export function recencyColumn(generation: number): string {
  return `g${generation}:updatedAt`;
}

export function withRecencyField(generation: number, summary: SessionSummary): SessionSummary {
  return { ...summary, [recencyColumn(generation)]: summary.updatedAt };
}

export function stripRecencyField(generation: number, record: SessionSummary): SessionSummary {
  const key = recencyColumn(generation);
  if (!(key in record)) return record;
  const rest: Record<string, unknown> = { ...record };
  delete rest[key];
  return rest as unknown as SessionSummary;
}