/*
 * © 2021 Thoughtworks, Inc.
 */

import { mockClient } from 'aws-sdk-client-mock'
import { ServiceWrapper } from '../lib'
import mockAWSCloudWatchGetMetricDataCall from '../lib/mockAWSCloudWatchGetMetricDataCall'
import EC2 from '../lib/EC2'
import { buildCostExplorerGetCostResponse } from './fixtures/builders'
import { AWS_CLOUD_CONSTANTS } from '../domain'
import { S3Client } from '@aws-sdk/client-s3'
import {
  CostExplorerClient,
  GetCostAndUsageCommand,
} from '@aws-sdk/client-cost-explorer'
import { CloudWatchLogsClient } from '@aws-sdk/client-cloudwatch-logs'
import { CloudWatchClient } from '@aws-sdk/client-cloudwatch'

const costExplorerMock = mockClient(CostExplorerClient)

describe('EC2', () => {
  afterEach(() => {
    costExplorerMock.reset()
  })

  const dayOneHourOne = '2020-07-10T21:00:00.000Z'
  const dayOneHourTwo = '2020-07-10T22:00:00.000Z'
  const dayOneHourThree = '2020-07-10T23:00:00.000Z'
  const dayTwoHourOne = '2020-07-11T00:00:00.000Z'
  const dayTwoHourTwo = '2020-07-11T01:00:00.000Z'
  const dayTwoHourThree = '2020-07-11T02:00:00.000Z'
  const region = 'us-east-one'
  const startDate = '2020-07-10'
  const endDate = '2020-07-11'
  const AVG_CPU_UTILIZATION_2020 = AWS_CLOUD_CONSTANTS.AVG_CPU_UTILIZATION_2020
  const metricDataQueries = [
    {
      Id: 'cpuUtilizationWithEmptyValues',
      Expression:
        "SEARCH('{AWS/EC2,InstanceId} MetricName=\"CPUUtilization\"', 'Average', 3600)",
      ReturnData: false,
    },
    {
      Id: 'cpuUtilization',
      Expression: 'REMOVE_EMPTY(cpuUtilizationWithEmptyValues)',
    },
    {
      Id: 'vCPUs',
      Expression:
        'SEARCH(\'{AWS/Usage,Resource,Type,Service,Class } Resource="vCPU" MetricName="ResourceCount"\', \'Average\', 3600)',
    },
  ]

  const getServiceWrapper = () =>
    new ServiceWrapper(
      new CloudWatchClient(),
      new CloudWatchLogsClient(),
      new CostExplorerClient(),
      new S3Client(),
    )

  it('gets EC2 usage', async () => {
    const response: any = {
      MetricDataResults: [
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-01914bfb56d65a9ae CPUUtilization',
          Timestamps: [dayOneHourOne, dayOneHourTwo],
          Values: [22.983333333333334, 31.435897435897434],
          StatusCode: 'Complete',
          Messages: [],
        },
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-0462587efbbf601c5 CPUUtilization',
          Timestamps: [dayOneHourTwo, dayTwoHourOne, dayTwoHourTwo],
          Values: [11.576923076923077, 9.716666666666667, 20.46153846153846],
          StatusCode: 'Complete',
          Messages: [],
        },
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-0489a00f5a4835dc8 CPUUtilization',
          Timestamps: [dayOneHourTwo, dayTwoHourOne, dayTwoHourTwo],
          Values: [9.63265306122449, 13.083333333333334, 32.44444444444444],
          StatusCode: 'Complete',
          Messages: [],
        },
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-057b1d36294c2ff23 CPUUtilization',
          Timestamps: [dayTwoHourTwo],
          Values: [10.26923076923077],
          StatusCode: 'Complete',
          Messages: [],
        },
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-0990709d4aafe0be8 CPUUtilization',
          Timestamps: [dayTwoHourTwo],
          Values: [9.75],
          StatusCode: 'Complete',
          Messages: [],
        },
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-0d1808334c391e056 CPUUtilization',
          Timestamps: [dayOneHourOne, dayOneHourTwo],
          Values: [11.566666666666666, 24.25],
          StatusCode: 'Complete',
          Messages: [],
        },
        {
          Id: 'vCPUs',
          Label: 'AWS/Usage Standard/OnDemand vCPU EC2 Resource ResourceCount',
          Timestamps: [
            dayOneHourOne,
            dayOneHourTwo,
            dayTwoHourOne,
            dayTwoHourTwo,
          ],
          Values: [4, 4.5, 4, 4.333333333333333],
          StatusCode: 'Complete',
          Messages: [],
        },
      ],
      Messages: [],
    }
    mockAWSCloudWatchGetMetricDataCall(
      new Date(dayTwoHourOne),
      new Date(dayTwoHourThree),
      response,
      metricDataQueries,
    )

    const ec2Service = new EC2(getServiceWrapper())

    const result = await ec2Service.getUsage(
      new Date('2020-07-11T00:00:00Z'),
      new Date('2020-07-11T02:00:00Z'),
    )

    expect(result).toEqual([
      {
        cpuUtilizationAverage: (22.983333333333334 + 11.566666666666666) / 2, //should be the average of CPUUtilization accross vcpus per hour
        vCpuHours: 4,
        timestamp: new Date(dayOneHourOne),
        usesAverageCPUConstant: false,
      },
      {
        cpuUtilizationAverage:
          (31.435897435897434 + 11.576923076923077 + 9.63265306122449 + 24.25) /
          4,
        vCpuHours: 4.5,
        timestamp: new Date(dayOneHourTwo),
        usesAverageCPUConstant: false,
      },
      {
        cpuUtilizationAverage: (9.716666666666667 + 13.083333333333334) / 2,
        vCpuHours: 4,
        timestamp: new Date(dayTwoHourOne),
        usesAverageCPUConstant: false,
      },
      {
        cpuUtilizationAverage:
          (20.46153846153846 + 32.44444444444444 + 10.26923076923077 + 9.75) /
          4,
        vCpuHours: 4.333333333333333,
        timestamp: new Date(dayTwoHourTwo),
        usesAverageCPUConstant: false,
      },
    ])
  })

  it('check for PartialData', async () => {
    const response: any = {
      MetricDataResults: [
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-01914bfb56d65a9ae CPUUtilization',
          Timestamps: [dayOneHourOne, dayOneHourTwo],
          Values: [22.983333333333334, 31.435897435897434],
          StatusCode: 'PartialData',
          Messages: [],
        },
        {
          Id: 'cpuUtilization',
          Label: 'AWS/EC2 i-0462587efbbf601c5 CPUUtilization',
          Timestamps: [dayOneHourTwo, dayTwoHourOne, dayTwoHourTwo],
          Values: [11.576923076923077, 9.716666666666667, 20.46153846153846],
          StatusCode: 'Complete',
          Messages: [],
        },
        {
          Id: 'vCPUs',
          Label: 'AWS/Usage Standard/OnDemand vCPU EC2 Resource ResourceCount',
          Timestamps: [
            dayOneHourOne,
            dayOneHourTwo,
            dayTwoHourOne,
            dayTwoHourTwo,
          ],
          Values: [4, 4.5, 4, 4.333333333333333],
          StatusCode: 'Complete',
          Messages: [],
        },
      ],
      Messages: [],
    }
    mockAWSCloudWatchGetMetricDataCall(
      new Date(dayTwoHourOne),
      new Date(dayTwoHourThree),
      response,
      metricDataQueries,
    )

    const ec2Service = new EC2(getServiceWrapper())
    const getEC2Usage = async () =>
      await ec2Service.getUsage(
        new Date(dayTwoHourOne),
        new Date(dayTwoHourThree),
      )

    await expect(getEC2Usage).rejects.toThrow('Partial Data Returned from AWS')
  })

  describe('missing CPU utilization', () => {
    it('uses average CPU utilization for every missing timestamp', async () => {
      const response: any = {
        MetricDataResults: [
          {
            Id: 'cpuUtilization',
            Timestamps: [dayOneHourOne],
            Values: [1],
          },
          {
            Id: 'vCPUs',
            Timestamps: [dayOneHourOne, dayOneHourTwo],
            Values: [1, 1],
          },
        ],
      }
      mockAWSCloudWatchGetMetricDataCall(
        new Date(dayOneHourOne),
        new Date(dayTwoHourOne),
        response,
        metricDataQueries,
      )

      const ec2Service = new EC2(getServiceWrapper())

      const result = await ec2Service.getUsage(
        new Date(dayOneHourOne),
        new Date(dayTwoHourOne),
      )

      expect(result).toEqual([
        {
          cpuUtilizationAverage: 1,
          vCpuHours: 1,
          timestamp: new Date(dayOneHourOne),
          usesAverageCPUConstant: false,
        },
        {
          cpuUtilizationAverage: AVG_CPU_UTILIZATION_2020,
          vCpuHours: 1,
          timestamp: new Date(dayOneHourTwo),
          usesAverageCPUConstant: true,
        },
      ])
    })

    it('uses average CPU utilization for every timestamp present for vCPUs', async () => {
      const response: any = {
        MetricDataResults: [
          {
            Id: 'vCPUs',
            Timestamps: [dayOneHourOne, dayOneHourTwo],
            Values: [4, 3],
          },
        ],
      }
      mockAWSCloudWatchGetMetricDataCall(
        new Date(dayOneHourOne),
        new Date(dayTwoHourOne),
        response,
        metricDataQueries,
      )

      const ec2Service = new EC2(getServiceWrapper())

      const result = await ec2Service.getUsage(
        new Date(dayOneHourOne),
        new Date(dayTwoHourOne),
      )

      expect(result).toEqual([
        {
          cpuUtilizationAverage: AVG_CPU_UTILIZATION_2020,
          vCpuHours: 4,
          timestamp: new Date(dayOneHourOne),
          usesAverageCPUConstant: true,
        },
        {
          cpuUtilizationAverage: AVG_CPU_UTILIZATION_2020,
          vCpuHours: 3,
          timestamp: new Date(dayOneHourTwo),
          usesAverageCPUConstant: true,
        },
      ])
    })
  })

  it('should not return an estimate for a given timestamp if no vCPU data is provided for that timestamp', async () => {
    const response: any = {
      MetricDataResults: [
        {
          Id: 'cpuUtilization',
          Timestamps: [dayTwoHourOne],
          Values: [1],
        },
        {
          Id: 'cpuUtilization',
          Timestamps: [dayTwoHourTwo],
          Values: [1],
        },
        {
          Id: 'vCPUs',
          Timestamps: [dayTwoHourTwo],
          Values: [1],
        },
      ],
    }
    mockAWSCloudWatchGetMetricDataCall(
      new Date(dayTwoHourOne),
      new Date(dayTwoHourThree),
      response,
      metricDataQueries,
    )

    const ec2Service = new EC2(getServiceWrapper())

    const result = await ec2Service.getUsage(
      new Date(dayTwoHourOne),
      new Date(dayTwoHourThree),
    )

    expect(result).toEqual([
      {
        cpuUtilizationAverage: 1,
        vCpuHours: 1,
        timestamp: new Date(dayTwoHourTwo),
        usesAverageCPUConstant: false,
      },
    ])
  })

  it('should return an empty array if no vCPUs', async () => {
    const response: any = {
      MetricDataResults: [
        {
          Id: 'cpuUtilization',
          Timestamps: [],
          Values: [],
        },
      ],
    }
    mockAWSCloudWatchGetMetricDataCall(
      new Date(dayOneHourOne),
      new Date(dayOneHourThree),
      response,
      metricDataQueries,
    )

    const ec2Service = new EC2(getServiceWrapper())

    const result = await ec2Service.getUsage(
      new Date(dayOneHourOne),
      new Date(dayOneHourThree),
    )

    expect(result).toEqual([])
  })

  it('gets ec2 cost', async () => {
    costExplorerMock.on(GetCostAndUsageCommand).resolves(
      buildCostExplorerGetCostResponse([
        { start: startDate, amount: 100.0, keys: ['EC2: Running Hours'] },
        { start: endDate, amount: 50.0, keys: ['test'] },
      ]),
    )

    const ec2Service = new EC2(getServiceWrapper())
    const ec2Costs = await ec2Service.getCosts(
      new Date(startDate),
      new Date(endDate),
      region,
    )

    expect(ec2Costs).toEqual([
      { amount: 100.0, currency: 'USD', timestamp: new Date(startDate) },
      { amount: 50.0, currency: 'USD', timestamp: new Date(endDate) },
    ])
  })
})