require "cases/helper"
require 'support/connection_helper'

class PostgresqlEnumTest < ActiveRecord::PostgreSQLTestCase
  include ConnectionHelper

  class PostgresqlEnum < ActiveRecord::Base
    self.table_name = "postgresql_enums"
  end

  def setup
    @connection = ActiveRecord::Base.connection
    @connection.transaction do
      @connection.execute <<-SQL
        CREATE TYPE mood AS ENUM ('sad', 'ok', 'happy');
      SQL
      @connection.create_table('postgresql_enums') do |t|
        t.column :current_mood, :mood
      end
    end
  end

  teardown do
    @connection.drop_table 'postgresql_enums', if_exists: true
    @connection.execute 'DROP TYPE IF EXISTS mood'
    reset_connection
  end

  def test_column
    column = PostgresqlEnum.columns_hash["current_mood"]
    assert_equal :enum, column.type
    assert_equal "mood", column.sql_type
    assert_not column.array?

    type = PostgresqlEnum.type_for_attribute("current_mood")
    assert_not type.binary?
  end

  def test_enum_defaults
    @connection.add_column 'postgresql_enums', 'good_mood', :mood, default: 'happy'
    PostgresqlEnum.reset_column_information

    assert_equal "happy", PostgresqlEnum.column_defaults['good_mood']
    assert_equal "happy", PostgresqlEnum.new.good_mood
  ensure
    PostgresqlEnum.reset_column_information
  end

  def test_enum_mapping
    @connection.execute "INSERT INTO postgresql_enums VALUES (1, 'sad');"
    enum = PostgresqlEnum.first
    assert_equal "sad", enum.current_mood

    enum.current_mood = "happy"
    enum.save!

    assert_equal "happy", enum.reload.current_mood
  end

  def test_invalid_enum_update
    @connection.execute "INSERT INTO postgresql_enums VALUES (1, 'sad');"
    enum = PostgresqlEnum.first
    enum.current_mood = "angry"

    assert_raise ActiveRecord::StatementInvalid do
      enum.save
    end
  end

  def test_no_oid_warning
    @connection.execute "INSERT INTO postgresql_enums VALUES (1, 'sad');"
    stderr_output = capture(:stderr) { PostgresqlEnum.first }

    assert stderr_output.blank?
  end

  def test_enum_type_cast
    enum = PostgresqlEnum.new
    enum.current_mood = :happy

    assert_equal "happy", enum.current_mood
  end

  def test_assigning_enum_to_nil
    model = PostgresqlEnum.new(current_mood: nil)

    assert_nil model.current_mood
    assert model.save
    assert_nil model.reload.current_mood
  end
end
