module PiiSafeSchema

# File lib/pii_safe_schema.rb, line 30
def self.activate!
  return if Rails.env.test?

  ActiveSupport.on_load :active_record do
    Notify.notify(PiiSafeSchema::PiiColumn.all)
  end
rescue ActiveRecord::NoDatabaseError
  Rails.logger.info('PiiSafeSchema: No DB'.red)
end

# File lib/pii_safe_schema.rb, line 18
def self.configuration
  @configuration ||= Configuration.new
end

# File lib/pii_safe_schema.rb, line 26
def self.configure
  yield(configuration)
end

# File lib/pii_safe_schema.rb, line 40
def self.generate_migrations(additional_pii_columns = [])
  PiiSafeSchema::MigrationGenerator.generate_migrations(
    PiiSafeSchema::PiiColumn.all + additional_pii_columns,
  )
end

# File lib/pii_safe_schema.rb, line 46
def self.parse_additional_columns(arguments)
  arguments.map do |str|
    matches = /([a-z_]+):([a-z_]+):([a-z_]+)/i.match(str)
    return print_help! if matches.blank?

    suggestion = Annotations.comment(matches[3])
    return print_help! if suggestion.blank?

    PiiColumn.from_column_name(table: matches[1], column: matches[2], suggestion: suggestion)
  end
end

# File lib/pii_safe_schema.rb, line 58
  def self.print_help!(do_exit: true) # rubocop:disable Metrics/MethodLength
    puts <<~HELPMSG # rubocop:disable Rails/Output
      Usage:
        rake pii_safe_schema:generate_migrations [table:column:annotation_type] ...

      Arguments:
        [table:column:annotation_type]   # A column to manually annotate. Can be repeated.
                                         # annotation_type can be "email", "phone", "ip_address",
                                         # "geolocation", "address", "postal_code", "name",
                                         # "sensitive_data", or "encrypted_data"

      Description:
        Generates a migration to add PII annotation comments to appropriate columns on a table.
        Uses a series of regular expressions to find sensitive fields.

        Optionally supply arguments to annotate columns explicitly

      Example:
        rake pii_safe_schema:generate_migrations signatures:signatory_name:name signatures:landline:phone

        Will generate a migration with the following, assuming automatic regex had no matches:

        class ChangeCommentsInSignatures < ActiveRecord::Migration[5.2]
          def change
            safety_assured do
              change_column :signatures, :signatory_name, :string, comment: '{"pii":{"obfuscate":"name_obfuscator"}}'
              change_column :signatures, :landline, :string, comment: '{"pii":{"obfuscate":"phone_obfuscator"}}'
            end
          end
        end
    HELPMSG

    exit(1) if do_exit # rubocop:disable Rails/Exit
  end

# File lib/pii_safe_schema.rb, line 22
def self.reset_configuration!
  @configuration = Configuration.new
end