/**
 * Copyright 2024 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// eslint-disable-next-line n/no-unpublished-import
import 'jasmine';
import {createGcpLoggingPinoConfig, TEST_ONLY} from './pino_gcp_config';
import * as pino from 'pino';

const serviceContext = {
  service: 'test',
  version: '0.1.0',
};

describe('Pino config', () => {
  const config = createGcpLoggingPinoConfig({serviceContext});

  it('should add mixins to the config object', () => {
    const pinoLoggerOptions: pino.LoggerOptions = {
      level: 'defaultLevel',
      formatters: {
        bindings: x => {
          return {a: x};
        },
      },
    };

    const configWithMixins = createGcpLoggingPinoConfig(
      {serviceContext},
      pinoLoggerOptions
    );

    expect(configWithMixins.level).toEqual('defaultLevel');
    expect(configWithMixins.formatters?.bindings).toBeDefined();
  });

  describe('Log level conversion', () => {
    // Need to define the return type of levelConverter because pino leaves it
    // as a plain `object`
    // eslint-disable-next-line @typescript-eslint/no-non-null-asserted-optional-chain
    const levelConverter = config.formatters?.level! as (
      label: string,
      level: number
    ) => Record<string, unknown>;

    Object.entries(TEST_ONLY.PINO_TO_GCP_LOG_LEVELS).forEach(e => {
      it(`converts pino level ${e[0]} to GCP ${e[1]}`, () => {
        const convertedLevel = levelConverter(e[0], 42);

        expect(convertedLevel.severity).toEqual(e[1]);
      });
    });

    it('defaults to INFO for an unknown level', () => {
      expect(levelConverter('blah', 66).severity).toEqual('INFO');
    });
  });

  describe('log formatter', () => {
    // eslint-disable-next-line @typescript-eslint/no-non-null-asserted-optional-chain
    const formatLogObject = config.formatters?.log!;
    const TEST_DATE = new Date('2024-04-13T16:12:34.123Z');

    beforeEach(() => {
      jasmine.clock().install();
      jasmine.clock().mockDate(TEST_DATE);
    });

    afterEach(() => {
      jasmine.clock().uninstall();
    });

    it('should add serviceContext', () => {
      const logObject = formatLogObject({});

      expect(logObject.serviceContext).toEqual({
        service: 'test',
        version: '0.1.0',
      });
    });

    it('should add insertId', () => {
      const logObject = formatLogObject({});

      expect(logObject['logging.googleapis.com/insertId']).toBeDefined();
      expect(
        (logObject['logging.googleapis.com/insertId'] as string).length
      ).toBeGreaterThan(1);
    });

    it('should add stack_trace when err is an Error', () => {
      const logObject = formatLogObject({
        err: new Error('some error message'),
        message: 'thrown an exception',
      });

      expect(logObject.stack_trace).toMatch('Error: some error message\n');
    });

    it('should not add stack_trace when err is not an Error', () => {
      const logObject = formatLogObject({
        err: 'some error message',
        message: 'thrown a string as an exception',
      });

      expect(logObject.stack_trace).toBeUndefined();
    });

    it('should not map span and trace properties when not present', () => {
      const formattedLog = formatLogObject({message: 'hello'});

      expect(
        formattedLog['logging.googleapis.com/trace_sampled']
      ).toBeUndefined();
      expect(formattedLog['logging.googleapis.com/trace']).toBeUndefined();
      expect(formattedLog['logging.googleapis.com/spanId']).toBeUndefined();
    });

    it('should replace span and trace properties when not present', () => {
      const formattedLog = formatLogObject({
        message: 'hello',
        trace_id: 'trace:12345',
        span_id: 'span:23456',
        trace_flags: 1,
      });

      expect(formattedLog['logging.googleapis.com/trace_sampled']).toBeTrue();
      expect(formattedLog['logging.googleapis.com/trace']).toBe('trace:12345');
      expect(formattedLog['logging.googleapis.com/spanId']).toBe('span:23456');
      expect(formattedLog.trace_id).toBeUndefined();
      expect(formattedLog.span_id).toBeUndefined();
      expect(formattedLog.trace_flags).toBeUndefined();
    });

    it('adds a timestamp as seconds:nanos JSON fragment', () => {
      const timestampGenerator = config.timestamp as () => string;

      expect(timestampGenerator()).toEqual(
        ',"timestamp":{"seconds":1713024754,"nanos":123000000}'
      );
    });

    it('adds a timestamp as seconds:nanos JSON fragment when nanos is 0', () => {
      jasmine.clock().mockDate(new Date('2024-04-13T16:12:34.000Z'));
      const timestampGenerator = config.timestamp as () => string;

      expect(timestampGenerator()).toEqual(
        ',"timestamp":{"seconds":1713024754,"nanos":0}'
      );
    });
  });
});