import express from 'express';
import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
import injectLogger from '../../src/middlewares/logger.js';

describe('logger middleware', () => {
  it('initializes', () => {
    const request = { header: (_key: string) => undefined } as express.Request;
    const response = { locals: {} } as express.Response;

    injectLogger(request, response, () => {});

    assert.deepEqual(response.locals.logger.getMetadata(), {
      correlation_id: undefined,
    });
  });

  it('correlation id', () => {
    const request = { header: (_key: string) => undefined } as express.Request;
    const response = { locals: { correlationId: '123' } } as express.Response;

    injectLogger(request, response, () => {});

    assert.deepEqual(response.locals.logger.getMetadata(), {
      correlation_id: '123',
    });
  });

  it('additional context', () => {
    const additional = JSON.stringify({
      foo: 'bar',
    });

    const request = { header: (_key: string) => additional } as express.Request;
    const response = { locals: { correlationId: '123' } } as express.Response;

    injectLogger(request, response, () => {});

    assert.deepEqual(response.locals.logger.getMetadata(), {
      correlation_id: '123',
      foo: 'bar',
    });
  });

  it('malformed additional context', () => {
    const request = { header: (_key: string) => 'nope' } as express.Request;
    const response = { locals: { correlationId: '123' } } as express.Response;

    injectLogger(request, response, () => {});

    assert.deepEqual(response.locals.logger.getMetadata(), {
      correlation_id: '123',
    });
  });
});