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

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

-- |
-- Module      : Amazonka.ECS.Types.Tag
-- Copyright   : (c) 2013-2023 Brendan Hay
-- License     : Mozilla Public License, v. 2.0.
-- Maintainer  : Brendan Hay
-- Stability   : auto-generated
-- Portability : non-portable (GHC extensions)
module Amazonka.ECS.Types.Tag where

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

-- | The metadata that you apply to a resource to help you categorize and
-- organize them. Each tag consists of a key and an optional value. You
-- define them.
--
-- The following basic restrictions apply to tags:
--
-- -   Maximum number of tags per resource - 50
--
-- -   For each resource, each tag key must be unique, and each tag key can
--     have only one value.
--
-- -   Maximum key length - 128 Unicode characters in UTF-8
--
-- -   Maximum value length - 256 Unicode characters in UTF-8
--
-- -   If your tagging schema is used across multiple services and
--     resources, remember that other services may have restrictions on
--     allowed characters. Generally allowed characters are: letters,
--     numbers, and spaces representable in UTF-8, and the following
--     characters: + - = . _ : \/ \@.
--
-- -   Tag keys and values are case-sensitive.
--
-- -   Do not use @aws:@, @AWS:@, or any upper or lowercase combination of
--     such as a prefix for either keys or values as it is reserved for
--     Amazon Web Services use. You cannot edit or delete tag keys or
--     values with this prefix. Tags with this prefix do not count against
--     your tags per resource limit.
--
-- /See:/ 'newTag' smart constructor.
data Tag = Tag'
  { -- | One part of a key-value pair that make up a tag. A @key@ is a general
    -- label that acts like a category for more specific tag values.
    key :: Prelude.Maybe Prelude.Text,
    -- | The optional part of a key-value pair that make up a tag. A @value@ acts
    -- as a descriptor within a tag category (key).
    value :: Prelude.Maybe Prelude.Text
  }
  deriving (Prelude.Eq, Prelude.Read, Prelude.Show, Prelude.Generic)

-- |
-- Create a value of 'Tag' 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:
--
-- 'key', 'tag_key' - One part of a key-value pair that make up a tag. A @key@ is a general
-- label that acts like a category for more specific tag values.
--
-- 'value', 'tag_value' - The optional part of a key-value pair that make up a tag. A @value@ acts
-- as a descriptor within a tag category (key).
newTag ::
  Tag
newTag =
  Tag'
    { key = Prelude.Nothing,
      value = Prelude.Nothing
    }

-- | One part of a key-value pair that make up a tag. A @key@ is a general
-- label that acts like a category for more specific tag values.
tag_key :: Lens.Lens' Tag (Prelude.Maybe Prelude.Text)
tag_key = Lens.lens (\Tag' {key} -> key) (\s@Tag' {} a -> s {key = a} :: Tag)

-- | The optional part of a key-value pair that make up a tag. A @value@ acts
-- as a descriptor within a tag category (key).
tag_value :: Lens.Lens' Tag (Prelude.Maybe Prelude.Text)
tag_value = Lens.lens (\Tag' {value} -> value) (\s@Tag' {} a -> s {value = a} :: Tag)

instance Data.FromJSON Tag where
  parseJSON =
    Data.withObject
      "Tag"
      ( \x ->
          Tag'
            Prelude.<$> (x Data..:? "key")
            Prelude.<*> (x Data..:? "value")
      )

instance Prelude.Hashable Tag where
  hashWithSalt _salt Tag' {..} =
    _salt
      `Prelude.hashWithSalt` key
      `Prelude.hashWithSalt` value

instance Prelude.NFData Tag where
  rnf Tag' {..} =
    Prelude.rnf key `Prelude.seq` Prelude.rnf value

instance Data.ToJSON Tag where
  toJSON Tag' {..} =
    Data.object
      ( Prelude.catMaybes
          [ ("key" Data..=) Prelude.<$> key,
            ("value" Data..=) Prelude.<$> value
          ]
      )