import type { IV30LegacySessionGroupsDocument } from './v30_sessionlayoutitemrefs.js';
import type { TControllerSessionId } from '../ts_interfaces/index.js';

type TObject = Record<string, unknown>;

export interface IProtocolV18LayoutMigrationResult {
  document: IV30LegacySessionGroupsDocument;
  migrated: boolean;
}

export interface IProtocolV18LegacySessionGroup {
  id: string;
  name: string;
  sessionIds: Array<TControllerSessionId | { harnessId: 'controller'; nativeId: string }>;
}

export interface IProtocolV18LegacySessionGroupsDocument
extends Omit<IV30LegacySessionGroupsDocument, 'groups' | 'ungroupedSessionIds'> {
  groups: IProtocolV18LegacySessionGroup[];
  ungroupedSessionIds?: Array<TControllerSessionId | { harnessId: 'controller'; nativeId: string }>;
}

const isPlainObject = (valueArg: unknown): valueArg is TObject =>
  typeof valueArg === 'object' && valueArg !== null && !Array.isArray(valueArg);

const isLegacyTerminalId = (valueArg: unknown): boolean =>
  isPlainObject(valueArg) && valueArg.harnessId === 'controller';

export const migrateProtocolV18SessionLayoutDocument = (
  valueArg: IProtocolV18LegacySessionGroupsDocument,
): IProtocolV18LayoutMigrationResult => {
  const groups = valueArg.groups.map((group) => ({
    ...group,
    sessionIds: group.sessionIds.filter(
      (sessionId): sessionId is TControllerSessionId => !isLegacyTerminalId(sessionId),
    ),
  }));
  const ungroupedSessionIds = (valueArg.ungroupedSessionIds ?? [])
    .filter((sessionId): sessionId is TControllerSessionId => !isLegacyTerminalId(sessionId));
  const migrated = groups.some((group, index) => (
    group.sessionIds.length !== valueArg.groups[index].sessionIds.length
  )) || ungroupedSessionIds.length !== (valueArg.ungroupedSessionIds ?? []).length;
  if (!migrated) return { document: valueArg as IV30LegacySessionGroupsDocument, migrated: false };
  return {
    document: {
      ...valueArg,
      groups,
      ungroupedSessionIds,
      revision: (valueArg.revision ?? 0) + 1,
    },
    migrated: true,
  };
};