'use strict';

const chai = require('chai');
const sinon = require('sinon');
const proxyquire = require('proxyquire');
const AwsProvider = require('../../../../../lib/plugins/aws/provider');
const AwsLogs = require('../../../../../lib/plugins/aws/logs');
const Serverless = require('../../../../../lib/Serverless');

// Configure chai
chai.use(require('chai-as-promised'));
const expect = require('chai').expect;

describe('AwsLogs', () => {
  let serverless;
  let awsLogs;

  beforeEach(() => {
    const options = {
      stage: 'dev',
      region: 'us-east-1',
      function: 'first',
    };
    serverless = new Serverless();
    const provider = new AwsProvider(serverless, options);
    provider.cachedCredentials = {
      credentials: { accessKeyId: 'foo', secretAccessKey: 'bar' },
    };
    serverless.setProvider('aws', provider);
    serverless.processedInput = { commands: ['logs'] };
    awsLogs = new AwsLogs(serverless, options);
  });

  describe('#constructor()', () => {
    it('should have hooks', () => expect(awsLogs.hooks).to.be.not.empty);

    it('should set an empty options object if no options are given', () => {
      const awsLogsWithEmptyOptions = new AwsLogs(serverless);

      expect(awsLogsWithEmptyOptions.options).to.deep.equal({});
    });

    it('should set the provider variable to an instance of AwsProvider', () =>
      expect(awsLogs.provider).to.be.instanceof(AwsProvider));

    it('should run promise chain in order', async () => {
      const validateStub = sinon.stub(awsLogs, 'extendedValidate').resolves();
      const getLogStreamsStub = sinon.stub(awsLogs, 'getLogStreams').resolves();
      const showLogsStub = sinon.stub(awsLogs, 'showLogs').resolves();

      await awsLogs.hooks['logs:logs']();

      expect(validateStub.calledOnce).to.be.equal(true);
      expect(getLogStreamsStub.calledAfter(validateStub)).to.be.equal(true);
      expect(showLogsStub.calledAfter(getLogStreamsStub)).to.be.equal(true);

      awsLogs.extendedValidate.restore();
      awsLogs.getLogStreams.restore();
      awsLogs.showLogs.restore();
    });
  });

  describe('#extendedValidate()', () => {
    beforeEach(() => {
      serverless.serviceDir = true;
      serverless.service.environment = {
        vars: {},
        stages: {
          dev: {
            vars: {},
            regions: {
              'us-east-1': {
                vars: {},
              },
            },
          },
        },
      };
      serverless.service.functions = {
        first: {
          handler: true,
          name: 'customName',
        },
      };
    });

    it('it should throw error if function is not provided', () => {
      serverless.service.functions = null;
      expect(() => awsLogs.extendedValidate()).to.throw(Error);
    });

    it('it should set default options', () => {
      awsLogs.extendedValidate();
      expect(awsLogs.options.stage).to.deep.equal('dev');
      expect(awsLogs.options.region).to.deep.equal('us-east-1');
      expect(awsLogs.options.function).to.deep.equal('first');
      expect(awsLogs.options.interval).to.be.equal(1000);
      expect(awsLogs.options.logGroupName).to.deep.equal(
        awsLogs.provider.naming.getLogGroupName('customName')
      );
    });
  });

  describe('#getLogStreams()', () => {
    beforeEach(() => {
      awsLogs.serverless.service.service = 'new-service';
      awsLogs.options = {
        stage: 'dev',
        region: 'us-east-1',
        function: 'first',
        logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
      };
    });

    it('should get log streams with correct params', async () => {
      const replyMock = {
        logStreams: [
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            creationTime: 1469687512311,
          },
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            creationTime: 1469687512311,
          },
        ],
      };
      const getLogStreamsStub = sinon.stub(awsLogs.provider, 'request').resolves(replyMock);

      const logStreamNames = await awsLogs.getLogStreams();

      expect(getLogStreamsStub.calledOnce).to.be.equal(true);
      expect(
        getLogStreamsStub.calledWithExactly('CloudWatchLogs', 'describeLogStreams', {
          logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
          descending: true,
          limit: 50,
          orderBy: 'LastEventTime',
        })
      ).to.be.equal(true);

      expect(logStreamNames[0]).to.be.equal('2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba');
      expect(logStreamNames[1]).to.be.equal('2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba');

      awsLogs.provider.request.restore();
    });

    it('should throw error if no log streams found', async () => {
      sinon.stub(awsLogs.provider, 'request').resolves();

      await expect(awsLogs.getLogStreams()).to.eventually.be.rejected.and.have.property(
        'name',
        'ServerlessError'
      );

      awsLogs.provider.request.restore();
    });
  });

  describe('#showLogs()', () => {
    let clock;
    const fakeTime = new Date(Date.UTC(2016, 9, 1)).getTime();

    beforeEach(() => {
      // set the fake Date 'Sat Sep 01 2016 00:00:00'
      clock = sinon.useFakeTimers(fakeTime);
    });

    afterEach(() => {
      // new Date() => will return the real time again (now)
      clock.restore();
    });

    it('should call filterLogEvents API with correct params', async () => {
      const replyMock = {
        events: [
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
        ],
      };
      const logStreamNamesMock = [
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
      ];
      const filterLogEventsStub = sinon.stub(awsLogs.provider, 'request').resolves(replyMock);
      awsLogs.serverless.service.service = 'new-service';
      awsLogs.options = {
        stage: 'dev',
        region: 'us-east-1',
        function: 'first',
        logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
        startTime: '3h',
        filter: 'error',
      };

      await awsLogs.showLogs(logStreamNamesMock);

      expect(filterLogEventsStub.calledOnce).to.be.equal(true);
      expect(
        filterLogEventsStub.calledWithExactly('CloudWatchLogs', 'filterLogEvents', {
          logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
          interleaved: true,
          logStreamNames: logStreamNamesMock,
          filterPattern: 'error',
          startTime: fakeTime - 3 * 60 * 60 * 1000, // -3h
        })
      ).to.be.equal(true);
      awsLogs.provider.request.restore();
    });

    it('should call filterLogEvents API with standard start time', async () => {
      const replyMock = {
        events: [
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
        ],
      };
      const logStreamNamesMock = [
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
      ];
      const filterLogEventsStub = sinon.stub(awsLogs.provider, 'request').resolves(replyMock);
      awsLogs.serverless.service.service = 'new-service';
      awsLogs.options = {
        stage: 'dev',
        region: 'us-east-1',
        function: 'first',
        logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
        startTime: '2010-10-20',
        filter: 'error',
      };

      await awsLogs.showLogs(logStreamNamesMock);

      expect(filterLogEventsStub.calledOnce).to.be.equal(true);
      expect(
        filterLogEventsStub.calledWithExactly('CloudWatchLogs', 'filterLogEvents', {
          logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
          interleaved: true,
          logStreamNames: logStreamNamesMock,
          startTime: 1287532800000, // '2010-10-20'
          filterPattern: 'error',
        })
      ).to.be.equal(true);

      awsLogs.provider.request.restore();
    });

    it('should call filterLogEvents API with latest 10 minutes if startTime not given', async () => {
      const replyMock = {
        events: [
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
        ],
      };
      const logStreamNamesMock = [
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
      ];
      const filterLogEventsStub = sinon.stub(awsLogs.provider, 'request').resolves(replyMock);
      awsLogs.serverless.service.service = 'new-service';
      awsLogs.options = {
        stage: 'dev',
        region: 'us-east-1',
        function: 'first',
        logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
      };

      await awsLogs.showLogs(logStreamNamesMock);

      expect(filterLogEventsStub.calledOnce).to.be.equal(true);
      expect(
        filterLogEventsStub.calledWithExactly('CloudWatchLogs', 'filterLogEvents', {
          logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
          interleaved: true,
          logStreamNames: logStreamNamesMock,
          startTime: fakeTime - 10 * 60 * 1000, // fakeTime - 10 minutes
        })
      ).to.be.equal(true);

      awsLogs.provider.request.restore();
    });

    it('should call filterLogEvents API which starts 10 seconds in the past if tail given', async () => {
      const replyMock = {
        events: [
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
          {
            logStreamName: '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
            timestamp: 1469687512311,
            message: 'test',
          },
        ],
      };
      const logStreamNamesMock = [
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
        '2016/07/28/[$LATEST]83f5206ab2a8488290349b9c1fbfe2ba',
      ];

      const timersSleep = sinon.stub().rejects();
      const MockedAwsLogs = proxyquire('../../../../../lib/plugins/aws/logs', {
        'timers-ext/promise/sleep': timersSleep,
      });

      const options = {
        stage: 'dev',
        region: 'us-east-1',
        function: 'first',
      };
      serverless = new Serverless();
      const provider = new AwsProvider(serverless, options);
      provider.cachedCredentials = {
        credentials: { accessKeyId: 'foo', secretAccessKey: 'bar' },
      };
      serverless.setProvider('aws', provider);
      serverless.processedInput = { commands: ['logs'] };
      const mockedAwsLogs = new MockedAwsLogs(serverless, options);

      const filterLogEventsStub = sinon.stub(mockedAwsLogs.provider, 'request').resolves(replyMock);
      mockedAwsLogs.serverless.service.service = 'new-service';
      mockedAwsLogs.options = {
        stage: 'dev',
        region: 'us-east-1',
        function: 'first',
        logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
        tail: true,
      };

      try {
        await mockedAwsLogs.showLogs(logStreamNamesMock);
      } catch {
        // timersSleep has to reject or it'll loop forever
      }

      expect(filterLogEventsStub.calledOnce).to.be.equal(true);
      expect(
        filterLogEventsStub.calledWithExactly('CloudWatchLogs', 'filterLogEvents', {
          logGroupName: awsLogs.provider.naming.getLogGroupName('new-service-dev-first'),
          interleaved: true,
          logStreamNames: logStreamNamesMock,
          startTime: fakeTime - 10 * 1000, // fakeTime - 10 minutes
        })
      ).to.be.equal(true);
    });
  });
});