{-# 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.CloudWatchEvents.DescribeRule
-- 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 specified rule.
--
-- DescribeRule does not list the targets of a rule. To see the targets
-- associated with a rule, use
-- <https://docs.aws.amazon.com/eventbridge/latest/APIReference/API_ListTargetsByRule.html ListTargetsByRule>.
module Amazonka.CloudWatchEvents.DescribeRule
  ( -- * Creating a Request
    DescribeRule (..),
    newDescribeRule,

    -- * Request Lenses
    describeRule_eventBusName,
    describeRule_name,

    -- * Destructuring the Response
    DescribeRuleResponse (..),
    newDescribeRuleResponse,

    -- * Response Lenses
    describeRuleResponse_arn,
    describeRuleResponse_createdBy,
    describeRuleResponse_description,
    describeRuleResponse_eventBusName,
    describeRuleResponse_eventPattern,
    describeRuleResponse_managedBy,
    describeRuleResponse_name,
    describeRuleResponse_roleArn,
    describeRuleResponse_scheduleExpression,
    describeRuleResponse_state,
    describeRuleResponse_httpStatus,
  )
where

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

-- | /See:/ 'newDescribeRule' smart constructor.
data DescribeRule = DescribeRule'
  { -- | The name or ARN of the event bus associated with the rule. If you omit
    -- this, the default event bus is used.
    eventBusName :: Prelude.Maybe Prelude.Text,
    -- | The name of the rule.
    name :: Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeRule' 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:
--
-- 'eventBusName', 'describeRule_eventBusName' - The name or ARN of the event bus associated with the rule. If you omit
-- this, the default event bus is used.
--
-- 'name', 'describeRule_name' - The name of the rule.
newDescribeRule ::
  -- | 'name'
  Prelude.Text ->
  DescribeRule
newDescribeRule pName_ =
  DescribeRule'
    { eventBusName = Prelude.Nothing,
      name = pName_
    }

-- | The name or ARN of the event bus associated with the rule. If you omit
-- this, the default event bus is used.
describeRule_eventBusName :: Lens.Lens' DescribeRule (Prelude.Maybe Prelude.Text)
describeRule_eventBusName = Lens.lens (\DescribeRule' {eventBusName} -> eventBusName) (\s@DescribeRule' {} a -> s {eventBusName = a} :: DescribeRule)

-- | The name of the rule.
describeRule_name :: Lens.Lens' DescribeRule Prelude.Text
describeRule_name = Lens.lens (\DescribeRule' {name} -> name) (\s@DescribeRule' {} a -> s {name = a} :: DescribeRule)

instance Core.AWSRequest DescribeRule where
  type AWSResponse DescribeRule = DescribeRuleResponse
  request overrides =
    Request.postJSON (overrides defaultService)
  response =
    Response.receiveJSON
      ( \s h x ->
          DescribeRuleResponse'
            Prelude.<$> (x Data..?> "Arn")
            Prelude.<*> (x Data..?> "CreatedBy")
            Prelude.<*> (x Data..?> "Description")
            Prelude.<*> (x Data..?> "EventBusName")
            Prelude.<*> (x Data..?> "EventPattern")
            Prelude.<*> (x Data..?> "ManagedBy")
            Prelude.<*> (x Data..?> "Name")
            Prelude.<*> (x Data..?> "RoleArn")
            Prelude.<*> (x Data..?> "ScheduleExpression")
            Prelude.<*> (x Data..?> "State")
            Prelude.<*> (Prelude.pure (Prelude.fromEnum s))
      )

instance Prelude.Hashable DescribeRule where
  hashWithSalt _salt DescribeRule' {..} =
    _salt
      `Prelude.hashWithSalt` eventBusName
      `Prelude.hashWithSalt` name

instance Prelude.NFData DescribeRule where
  rnf DescribeRule' {..} =
    Prelude.rnf eventBusName
      `Prelude.seq` Prelude.rnf name

instance Data.ToHeaders DescribeRule where
  toHeaders =
    Prelude.const
      ( Prelude.mconcat
          [ "X-Amz-Target"
              Data.=# ("AWSEvents.DescribeRule" :: Prelude.ByteString),
            "Content-Type"
              Data.=# ( "application/x-amz-json-1.1" ::
                          Prelude.ByteString
                      )
          ]
      )

instance Data.ToJSON DescribeRule where
  toJSON DescribeRule' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("EventBusName" Data..=) Prelude.<$> eventBusName,
            Prelude.Just ("Name" Data..= name)
          ]
      )

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

instance Data.ToQuery DescribeRule where
  toQuery = Prelude.const Prelude.mempty

-- | /See:/ 'newDescribeRuleResponse' smart constructor.
data DescribeRuleResponse = DescribeRuleResponse'
  { -- | The Amazon Resource Name (ARN) of the rule.
    arn :: Prelude.Maybe Prelude.Text,
    -- | The account ID of the user that created the rule. If you use @PutRule@
    -- to put a rule on an event bus in another account, the other account is
    -- the owner of the rule, and the rule ARN includes the account ID for that
    -- account. However, the value for @CreatedBy@ is the account ID as the
    -- account that created the rule in the other account.
    createdBy :: Prelude.Maybe Prelude.Text,
    -- | The description of the rule.
    description :: Prelude.Maybe Prelude.Text,
    -- | The name of the event bus associated with the rule.
    eventBusName :: Prelude.Maybe Prelude.Text,
    -- | The event pattern. For more information, see
    -- <https://docs.aws.amazon.com/eventbridge/latest/userguide/eventbridge-and-event-patterns.html Events and Event Patterns>
    -- in the /Amazon EventBridge User Guide/.
    eventPattern :: Prelude.Maybe Prelude.Text,
    -- | If this is a managed rule, created by an Amazon Web Services service on
    -- your behalf, this field displays the principal name of the Amazon Web
    -- Services service that created the rule.
    managedBy :: Prelude.Maybe Prelude.Text,
    -- | The name of the rule.
    name :: Prelude.Maybe Prelude.Text,
    -- | The Amazon Resource Name (ARN) of the IAM role associated with the rule.
    roleArn :: Prelude.Maybe Prelude.Text,
    -- | The scheduling expression. For example, \"cron(0 20 * * ? *)\", \"rate(5
    -- minutes)\".
    scheduleExpression :: Prelude.Maybe Prelude.Text,
    -- | Specifies whether the rule is enabled or disabled.
    state :: Prelude.Maybe RuleState,
    -- | The response's http status code.
    httpStatus :: Prelude.Int
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'DescribeRuleResponse' 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:
--
-- 'arn', 'describeRuleResponse_arn' - The Amazon Resource Name (ARN) of the rule.
--
-- 'createdBy', 'describeRuleResponse_createdBy' - The account ID of the user that created the rule. If you use @PutRule@
-- to put a rule on an event bus in another account, the other account is
-- the owner of the rule, and the rule ARN includes the account ID for that
-- account. However, the value for @CreatedBy@ is the account ID as the
-- account that created the rule in the other account.
--
-- 'description', 'describeRuleResponse_description' - The description of the rule.
--
-- 'eventBusName', 'describeRuleResponse_eventBusName' - The name of the event bus associated with the rule.
--
-- 'eventPattern', 'describeRuleResponse_eventPattern' - The event pattern. For more information, see
-- <https://docs.aws.amazon.com/eventbridge/latest/userguide/eventbridge-and-event-patterns.html Events and Event Patterns>
-- in the /Amazon EventBridge User Guide/.
--
-- 'managedBy', 'describeRuleResponse_managedBy' - If this is a managed rule, created by an Amazon Web Services service on
-- your behalf, this field displays the principal name of the Amazon Web
-- Services service that created the rule.
--
-- 'name', 'describeRuleResponse_name' - The name of the rule.
--
-- 'roleArn', 'describeRuleResponse_roleArn' - The Amazon Resource Name (ARN) of the IAM role associated with the rule.
--
-- 'scheduleExpression', 'describeRuleResponse_scheduleExpression' - The scheduling expression. For example, \"cron(0 20 * * ? *)\", \"rate(5
-- minutes)\".
--
-- 'state', 'describeRuleResponse_state' - Specifies whether the rule is enabled or disabled.
--
-- 'httpStatus', 'describeRuleResponse_httpStatus' - The response's http status code.
newDescribeRuleResponse ::
  -- | 'httpStatus'
  Prelude.Int ->
  DescribeRuleResponse
newDescribeRuleResponse pHttpStatus_ =
  DescribeRuleResponse'
    { arn = Prelude.Nothing,
      createdBy = Prelude.Nothing,
      description = Prelude.Nothing,
      eventBusName = Prelude.Nothing,
      eventPattern = Prelude.Nothing,
      managedBy = Prelude.Nothing,
      name = Prelude.Nothing,
      roleArn = Prelude.Nothing,
      scheduleExpression = Prelude.Nothing,
      state = Prelude.Nothing,
      httpStatus = pHttpStatus_
    }

-- | The Amazon Resource Name (ARN) of the rule.
describeRuleResponse_arn :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_arn = Lens.lens (\DescribeRuleResponse' {arn} -> arn) (\s@DescribeRuleResponse' {} a -> s {arn = a} :: DescribeRuleResponse)

-- | The account ID of the user that created the rule. If you use @PutRule@
-- to put a rule on an event bus in another account, the other account is
-- the owner of the rule, and the rule ARN includes the account ID for that
-- account. However, the value for @CreatedBy@ is the account ID as the
-- account that created the rule in the other account.
describeRuleResponse_createdBy :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_createdBy = Lens.lens (\DescribeRuleResponse' {createdBy} -> createdBy) (\s@DescribeRuleResponse' {} a -> s {createdBy = a} :: DescribeRuleResponse)

-- | The description of the rule.
describeRuleResponse_description :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_description = Lens.lens (\DescribeRuleResponse' {description} -> description) (\s@DescribeRuleResponse' {} a -> s {description = a} :: DescribeRuleResponse)

-- | The name of the event bus associated with the rule.
describeRuleResponse_eventBusName :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_eventBusName = Lens.lens (\DescribeRuleResponse' {eventBusName} -> eventBusName) (\s@DescribeRuleResponse' {} a -> s {eventBusName = a} :: DescribeRuleResponse)

-- | The event pattern. For more information, see
-- <https://docs.aws.amazon.com/eventbridge/latest/userguide/eventbridge-and-event-patterns.html Events and Event Patterns>
-- in the /Amazon EventBridge User Guide/.
describeRuleResponse_eventPattern :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_eventPattern = Lens.lens (\DescribeRuleResponse' {eventPattern} -> eventPattern) (\s@DescribeRuleResponse' {} a -> s {eventPattern = a} :: DescribeRuleResponse)

-- | If this is a managed rule, created by an Amazon Web Services service on
-- your behalf, this field displays the principal name of the Amazon Web
-- Services service that created the rule.
describeRuleResponse_managedBy :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_managedBy = Lens.lens (\DescribeRuleResponse' {managedBy} -> managedBy) (\s@DescribeRuleResponse' {} a -> s {managedBy = a} :: DescribeRuleResponse)

-- | The name of the rule.
describeRuleResponse_name :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_name = Lens.lens (\DescribeRuleResponse' {name} -> name) (\s@DescribeRuleResponse' {} a -> s {name = a} :: DescribeRuleResponse)

-- | The Amazon Resource Name (ARN) of the IAM role associated with the rule.
describeRuleResponse_roleArn :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_roleArn = Lens.lens (\DescribeRuleResponse' {roleArn} -> roleArn) (\s@DescribeRuleResponse' {} a -> s {roleArn = a} :: DescribeRuleResponse)

-- | The scheduling expression. For example, \"cron(0 20 * * ? *)\", \"rate(5
-- minutes)\".
describeRuleResponse_scheduleExpression :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe Prelude.Text)
describeRuleResponse_scheduleExpression = Lens.lens (\DescribeRuleResponse' {scheduleExpression} -> scheduleExpression) (\s@DescribeRuleResponse' {} a -> s {scheduleExpression = a} :: DescribeRuleResponse)

-- | Specifies whether the rule is enabled or disabled.
describeRuleResponse_state :: Lens.Lens' DescribeRuleResponse (Prelude.Maybe RuleState)
describeRuleResponse_state = Lens.lens (\DescribeRuleResponse' {state} -> state) (\s@DescribeRuleResponse' {} a -> s {state = a} :: DescribeRuleResponse)

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

instance Prelude.NFData DescribeRuleResponse where
  rnf DescribeRuleResponse' {..} =
    Prelude.rnf arn
      `Prelude.seq` Prelude.rnf createdBy
      `Prelude.seq` Prelude.rnf description
      `Prelude.seq` Prelude.rnf eventBusName
      `Prelude.seq` Prelude.rnf eventPattern
      `Prelude.seq` Prelude.rnf managedBy
      `Prelude.seq` Prelude.rnf name
      `Prelude.seq` Prelude.rnf roleArn
      `Prelude.seq` Prelude.rnf scheduleExpression
      `Prelude.seq` Prelude.rnf state
      `Prelude.seq` Prelude.rnf httpStatus