import { migrateV1ToV2 } from './migrations/v01_to_v02.ts';
import type { ToIumIndexV1 } from './v01.ts';
import type { ToIumIndexV2 } from './v02.ts';

export const CURRENT_IUM_VERSION = 2;

/**
 * Index schema generated by the actual version of this package
 */
export type ToIumIndex = ToIumIndexV2;

/**
 * Union of all index schema versions, used internally to check and migrate the index for proper unserialization.
 */
export type ToIumIndexVersions = ToIumIndexV1 | ToIumIndexV2;

// eslint-disable-next-line @typescript-eslint/no-explicit-any
const migrations: Array<(index: any) => any> = [migrateV1ToV2];

// eslint-disable-next-line jsdoc/require-jsdoc
export function migrateIumIndex(index: ToIumIndexVersions): ToIumIndex {
  const version = index.version ?? 1;
  if (version === CURRENT_IUM_VERSION) return index as ToIumIndex;

  const indexMigration = version - 1;
  const migration = migrations[indexMigration];
  if (!migration) throw new Error(`No migration found for version ${version}`);

  const indexMigrated = migration(index);
  return migrateIumIndex(indexMigrated);
}