import { Test } from '@nestjs/testing';
import { describe, expect, it } from 'vitest';
import { MeshService } from '../mesh/mesh.service.js';
import { CommandModule } from './command.module.js';
import { CommandService } from './command.service.js';

describe('DI wiring (module graph)', () => {
  // compile() instantiates providers but does not run lifecycle hooks, so no TCP connection is opened.
  it('resolves CommandService with MeshService provided by MeshModule', async () => {
    process.env.MESH_DB_PATH = ':memory:'; // keep openMessageDb from touching the repo's ./data
    const moduleRef = await Test.createTestingModule({
      imports: [CommandModule],
    }).compile();
    expect(moduleRef.get(CommandService)).toBeInstanceOf(CommandService);
    expect(moduleRef.get(MeshService)).toBeInstanceOf(MeshService);
  });

  // the MeshService <-> CommandService cycle must resolve to live references on both sides, not undefined
  it('wires both sides of the circular dependency with real instances', async () => {
    process.env.MESH_DB_PATH = ':memory:';
    const moduleRef = await Test.createTestingModule({
      imports: [CommandModule],
    }).compile();
    const mesh = moduleRef.get(MeshService);
    const commands = moduleRef.get(CommandService);
    expect((commands as unknown as { mesh?: MeshService }).mesh).toBe(mesh);
    expect((mesh as unknown as { commands?: CommandService }).commands).toBe(
      commands,
    );
  });
});