import { Test } from '@nestjs/testing';
import type { INestApplication } from '@nestjs/common';
import type { NestExpressApplication } from '@nestjs/platform-express';

// Valores ficticios: los e2e no se conectan a SAP ni a un archivo SQLite.
process.env.SAPB1_SL_URL ??= 'https://sap.invalid:50000/b1s/v1';
process.env.SAPB1_SL_COMPANYDB ??= 'DB';
process.env.SAPB1_SL_USER ??= 'u';
process.env.SAPB1_SL_PASSWORD ??= 'p';
process.env.SQLITE_PATH = ':memory:';

export interface FakeEmployee {
  EmployeeID: number;
  FirstName: string;
  LastName: string;
  Active: string;
  U_WEB_USER: string;
  U_WEB_PASS: string;
}

export const employee = (webUser: string, id = 1, pass = 'secreto'): FakeEmployee => ({
  EmployeeID: id,
  FirstName: webUser,
  LastName: 'Test',
  Active: 'tYES',
  U_WEB_USER: webUser,
  U_WEB_PASS: pass,
});

export interface FakeSapRequest {
  method: string;
  path: string;
  query?: Record<string, unknown>;
  body?: unknown;
  headers?: Record<string, string>;
}

/** Llamadas que llegaron al "Service Layer" simulado (se vacía en cada createTestApp). */
export const sapCalls: FakeSapRequest[] = [];

/** App completa con EmployeesInfo y la sesión SAP simulados. */
export async function createTestApp(
  employees: FakeEmployee[],
  adminWebUsers = '',
  onSapRequest: (req: FakeSapRequest) => unknown = () => ({}),
): Promise<INestApplication> {
  sapCalls.length = 0;
  process.env.ADMIN_WEB_USERS = adminWebUsers;
  const { AppModule } = await import('../../src/app.module.js');
  const { SapClientService } = await import('../../src/sap/sap-client.service.js');
  const { SapSessionService } = await import('../../src/sap/sap-session.service.js');

  const moduleRef = await Test.createTestingModule({ imports: [AppModule] })
    .overrideProvider(SapClientService)
    .useValue({
      get: async (_path: string, q: { $filter: string }) => ({
        data: { value: employees.filter((e) => q.$filter === `U_WEB_USER eq '${e.U_WEB_USER}'`) },
      }),
      request: async (req: FakeSapRequest) => {
        sapCalls.push(req);
        return { status: 200, headers: {}, data: onSapRequest(req) };
      },
    })
    .overrideProvider(SapSessionService)
    .useValue({ getSession: async () => ({}), status: () => ({ connected: true }), onModuleDestroy: () => undefined })
    .compile();

  const { configureApp } = await import('../../src/app.setup.js');
  const app = moduleRef.createNestApplication<NestExpressApplication>();
  configureApp(app);
  await app.init();
  return app;
}