# This migration comes from active_storage (originally 20170806125915)
class CreateActiveStorageTables < ActiveRecord::Migration[5.2]
  def change
    # Use Active Record's configured type for primary and foreign keys
    primary_key_type, foreign_key_type = primary_and_foreign_key_types

    create_table(:active_storage_blobs, id: primary_key_type) do |t|
      t.string(:key, null: false)
      t.string(:filename, null: false)
      t.string(:content_type)
      t.text(:metadata)
      t.string(:service_name, null: false)
      t.bigint(:byte_size, null: false)
      t.string(:checksum)

      if connection.supports_datetime_with_precision?
        t.datetime(:created_at, precision: 6, null: false)
      else
        t.datetime(:created_at, null: false)
      end

      t.index([ :key ], unique: true)
    end

    create_table(:active_storage_attachments, id: primary_key_type) do |t|
      t.string(:name, null: false)
      t.references(:record, null: false, polymorphic: true, index: false, type: foreign_key_type)
      t.references(:blob, null: false, type: foreign_key_type)

      if connection.supports_datetime_with_precision?
        t.datetime(:created_at, precision: 6, null: false)
      else
        t.datetime(:created_at, null: false)
      end

      t.index(
        [ :record_type, :record_id, :name, :blob_id ],
        name: :index_active_storage_attachments_uniqueness,
        unique: true,
      )
      t.foreign_key(:active_storage_blobs, column: :blob_id)
    end

    create_table(:active_storage_variant_records, id: primary_key_type) do |t|
      t.belongs_to(:blob, null: false, index: false, type: foreign_key_type)
      t.string(:variation_digest, null: false)

      t.index(
        [ :blob_id, :variation_digest ],
        name: :index_active_storage_variant_records_uniqueness,
        unique: true,
      )
      t.foreign_key(:active_storage_blobs, column: :blob_id)
    end
  end

  private

  def primary_and_foreign_key_types
    config = Rails.configuration.generators
    setting = config.options[config.orm][:primary_key_type]
    primary_key_type = setting || :primary_key
    foreign_key_type = setting || :bigint
    [ primary_key_type, foreign_key_type ]
  end
end
