const MaterialPackageService = require('../src/services/materialPackageService');

jest.mock('../src/utils/logger', () => ({ info: jest.fn(), error: jest.fn() }));

describe('MaterialPackageService aggregate creation', () => {
  function fixture({ failChild = false } = {}) {
    const connection = {
      beginTransaction: jest.fn(), commit: jest.fn(), rollback: jest.fn(), release: jest.fn(),
      execute: jest.fn(async sql => {
        if (sql.includes('INSERT INTO material_packages')) return [{ insertId: 7 }];
        if (failChild && sql.includes('INSERT INTO package_materials')) throw new Error('material failed');
        if (sql.includes('INSERT INTO package_materials')) return [{ insertId: 11 }];
        if (sql.includes('SELECT * FROM material_packages')) return [[{ id: 7, name: 'Package', version: 1 }]];
        throw new Error(`Unexpected SQL: ${sql}`);
      })
    };
    return {
      connection,
      service: new MaterialPackageService({ pool: { getConnection: async () => connection } })
    };
  }

  test('creates the package and all materials atomically and returns its current version', async () => {
    const { service, connection } = fixture();
    const result = await service.createPackage({
      name: 'Package', description: 'Description', category: 'Roof', createdBy: 'operator',
      materials: [{ materialName: 'Tile', materialCategory: 'Roof', quantity: 2, unit: 'stk', unitPrice: 10 }]
    });

    expect(result).toMatchObject({ id: 7, version: 1, package: { id: 7, version: 1 } });
    expect(connection.beginTransaction).toHaveBeenCalledTimes(1);
    expect(connection.commit).toHaveBeenCalledTimes(1);
    expect(connection.rollback).not.toHaveBeenCalled();
    expect(connection.release).toHaveBeenCalledTimes(1);
  });

  test('rolls the parent back if a material insert fails', async () => {
    const { service, connection } = fixture({ failChild: true });
    await expect(service.createPackage({
      name: 'Package', description: 'Description', category: 'Roof', createdBy: 'operator',
      materials: [{ materialName: 'Tile', materialCategory: 'Roof', quantity: 2, unit: 'stk', unitPrice: 10 }]
    })).rejects.toThrow('material failed');
    expect(connection.rollback).toHaveBeenCalledTimes(1);
    expect(connection.commit).not.toHaveBeenCalled();
  });
});