{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StrictData #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# OPTIONS_GHC -fno-warn-unused-binds #-}
{-# OPTIONS_GHC -fno-warn-unused-imports #-}
{-# OPTIONS_GHC -fno-warn-unused-matches #-}

-- Derived from AWS service descriptions, licensed under Apache 2.0.

-- |
-- Module      : Amazonka.ELB.DescribeInstanceHealth
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
--
-- Describes the state of the specified instances with respect to the
-- specified load balancer. If no instances are specified, the call
-- describes the state of all instances that are currently registered with
-- the load balancer. If instances are specified, their state is returned
-- even if they are no longer registered with the load balancer. The state
-- of terminated instances is not returned.
module Amazonka.ELB.DescribeInstanceHealth
  ( -- * Creating a Request
    DescribeInstanceHealth (..),
    newDescribeInstanceHealth,

    -- * Request Lenses
    describeInstanceHealth_instances,
    describeInstanceHealth_loadBalancerName,

    -- * Destructuring the Response
    DescribeInstanceHealthResponse (..),
    newDescribeInstanceHealthResponse,

    -- * Response Lenses
    describeInstanceHealthResponse_instanceStates,
    describeInstanceHealthResponse_httpStatus,
  )
where

import qualified Amazonka.Core as Core
import qualified Amazonka.Core.Lens.Internal as Lens
import qualified Amazonka.Data as Data
import Amazonka.ELB.Types
import qualified Amazonka.Prelude as Prelude
import qualified Amazonka.Request as Request
import qualified Amazonka.Response as Response

-- | Contains the parameters for DescribeInstanceHealth.
--
-- /See:/ 'newDescribeInstanceHealth' smart constructor.
data DescribeInstanceHealth = DescribeInstanceHealth'
  { -- | The IDs of the instances.
    instances :: Prelude.Maybe [Instance],
    -- | The name of the load balancer.
    loadBalancerName :: Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeInstanceHealth' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'instances', 'describeInstanceHealth_instances' - The IDs of the instances.
--
-- 'loadBalancerName', 'describeInstanceHealth_loadBalancerName' - The name of the load balancer.
newDescribeInstanceHealth ::
  -- | 'loadBalancerName'
  Prelude.Text ->
  DescribeInstanceHealth
newDescribeInstanceHealth pLoadBalancerName_ =
  DescribeInstanceHealth'
    { instances =
        Prelude.Nothing,
      loadBalancerName = pLoadBalancerName_
    }

-- | The IDs of the instances.
describeInstanceHealth_instances :: Lens.Lens' DescribeInstanceHealth (Prelude.Maybe [Instance])
describeInstanceHealth_instances = Lens.lens (\DescribeInstanceHealth' {instances} -> instances) (\s@DescribeInstanceHealth' {} a -> s {instances = a} :: DescribeInstanceHealth) Prelude.. Lens.mapping Lens.coerced

-- | The name of the load balancer.
describeInstanceHealth_loadBalancerName :: Lens.Lens' DescribeInstanceHealth Prelude.Text
describeInstanceHealth_loadBalancerName = Lens.lens (\DescribeInstanceHealth' {loadBalancerName} -> loadBalancerName) (\s@DescribeInstanceHealth' {} a -> s {loadBalancerName = a} :: DescribeInstanceHealth)

instance Core.AWSRequest DescribeInstanceHealth where
  type
    AWSResponse DescribeInstanceHealth =
      DescribeInstanceHealthResponse
  request overrides =
    Request.postQuery (overrides defaultService)
  response =
    Response.receiveXMLWrapper
      "DescribeInstanceHealthResult"
      ( \s h x ->
          DescribeInstanceHealthResponse'
            Prelude.<$> ( x
                            Data..@? "InstanceStates"
                            Core..!@ Prelude.mempty
                            Prelude.>>= Core.may (Data.parseXMLList "member")
                        )
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

instance Prelude.Hashable DescribeInstanceHealth where
  hashWithSalt _salt DescribeInstanceHealth' {..} =
    _salt
      `Prelude.hashWithSalt` instances
      `Prelude.hashWithSalt` loadBalancerName

instance Prelude.NFData DescribeInstanceHealth where
  rnf DescribeInstanceHealth' {..} =
    Prelude.rnf instances
      `Prelude.seq` Prelude.rnf loadBalancerName

instance Data.ToHeaders DescribeInstanceHealth where
  toHeaders = Prelude.const Prelude.mempty

instance Data.ToPath DescribeInstanceHealth where
  toPath = Prelude.const "/"

instance Data.ToQuery DescribeInstanceHealth where
  toQuery DescribeInstanceHealth' {..} =
    Prelude.mconcat
      [ "Action"
          Data.=: ("DescribeInstanceHealth" :: Prelude.ByteString),
        "Version"
          Data.=: ("2012-06-01" :: Prelude.ByteString),
        "Instances"
          Data.=: Data.toQuery
            (Data.toQueryList "member" Prelude.<$> instances),
        "LoadBalancerName" Data.=: loadBalancerName
      ]

-- | Contains the output for DescribeInstanceHealth.
--
-- /See:/ 'newDescribeInstanceHealthResponse' smart constructor.
data DescribeInstanceHealthResponse = DescribeInstanceHealthResponse'
  { -- | Information about the health of the instances.
    instanceStates :: Prelude.Maybe [InstanceState],
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeInstanceHealthResponse' with all optional fields omitted.
--
-- Use <https://hackage.haskell.org/package/generic-lens generic-lens> or <https://hackage.haskell.org/package/optics optics> to modify other optional fields.
--
-- The following record fields are available, with the corresponding lenses provided
-- for backwards compatibility:
--
-- 'instanceStates', 'describeInstanceHealthResponse_instanceStates' - Information about the health of the instances.
--
-- 'httpStatus', 'describeInstanceHealthResponse_httpStatus' - The response's http status code.
newDescribeInstanceHealthResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  DescribeInstanceHealthResponse
newDescribeInstanceHealthResponse pHttpStatus_ =
  DescribeInstanceHealthResponse'
    { instanceStates =
        Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | Information about the health of the instances.
describeInstanceHealthResponse_instanceStates :: Lens.Lens' DescribeInstanceHealthResponse (Prelude.Maybe [InstanceState])
describeInstanceHealthResponse_instanceStates = Lens.lens (\DescribeInstanceHealthResponse' {instanceStates} -> instanceStates) (\s@DescribeInstanceHealthResponse' {} a -> s {instanceStates = a} :: DescribeInstanceHealthResponse) Prelude.. Lens.mapping Lens.coerced

-- | The response's http status code.
describeInstanceHealthResponse_httpStatus :: Lens.Lens' DescribeInstanceHealthResponse Prelude.Int
describeInstanceHealthResponse_httpStatus = Lens.lens (\DescribeInstanceHealthResponse' {httpStatus} -> httpStatus) (\s@DescribeInstanceHealthResponse' {} a -> s {httpStatus = a} :: DescribeInstanceHealthResponse)

instance
  Prelude.NFData
    DescribeInstanceHealthResponse
  where
  rnf DescribeInstanceHealthResponse' {..} =
    Prelude.rnf instanceStates
      `Prelude.seq` Prelude.rnf httpStatus