import { expect, tap } from '@git.zone/tstest/tapbundle';

import { createMigrationRunner } from '../ts_migrations/index.js';

function setPath(target: Record<string, any>, path: string, value: unknown): void {
  const parts = path.split('.');
  let cursor = target;
  for (const part of parts.slice(0, -1)) {
    cursor[part] = cursor[part] || {};
    cursor = cursor[part];
  }
  cursor[parts[parts.length - 1]] = value;
}

function applySet(document: Record<string, any>, set: Record<string, unknown>): void {
  for (const [key, value] of Object.entries(set)) {
    setPath(document, key, value);
  }
}

function createFakeDb(currentVersion: string) {
  const ledgerDocument = {
    nameId: 'smartmigration:smartmigration',
    data: {
      currentVersion,
      steps: {},
      lock: { holder: null, acquiredAt: null, expiresAt: null },
      checkpoints: {},
    },
  };

  const emptyCollection = {
    find: () => ({
      async *[Symbol.asyncIterator]() {},
    }),
    updateMany: async () => ({ modifiedCount: 0 }),
  };

  const ledgerCollection = {
    createIndex: async () => undefined,
    findOne: async () => structuredClone(ledgerDocument),
    findOneAndUpdate: async (_query: unknown, update: any) => {
      applySet(ledgerDocument, update.$set || {});
      return structuredClone(ledgerDocument);
    },
    updateOne: async (_query: unknown, update: any) => {
      applySet(ledgerDocument, update.$set || {});
      return { matchedCount: 1, modifiedCount: 1, upsertedCount: 0 };
    },
  };

  return {
    mongoDb: {
      collection: (name: string) =>
        name === 'SmartdataEasyStore' ? ledgerCollection : emptyCollection,
    },
  };
}

tap.test('migration runner bridges old package-version targets without real schema steps', async () => {
  const runner = await createMigrationRunner(createFakeDb('13.16.0'), '13.31.0');
  const result = await runner.run();

  expect(result.currentVersionBefore).toEqual('13.16.0');
  expect(result.currentVersionAfter).toEqual('13.31.0');
  expect(result.stepsApplied).toHaveLength(3);
});

export default tap.start();