# frozen_string_literal: true

# polyfill Rails >= 5 versioned migrations

unless ActiveRecord::Migration.respond_to?(:[])
  module ActiveRecord
    class Migration
      def self.[](_version)
        self
      end
    end
  end
end

module MigrationDatabaseHelper
  def json_supported_database?
    (postgres? && postgres_correct_version?) || (mysql? && mysql_correct_version?)
  end

  def postgres?
    database_name == 'ActiveRecord::ConnectionAdapters::PostgreSQLAdapter'
  end

  def postgres_correct_version?
    database_version > '9.3'
  end

  def mysql?
    database_name == 'ActiveRecord::ConnectionAdapters::MysqlAdapter'
  end

  def mysql_correct_version?
    database_version > '5.7.7'
  end

  def database_name
    ActiveRecord::Base.connection.class.name
  end

  def database_version
    ActiveRecord::Base.connection.select_value('SELECT VERSION()')
  end
end