require "cases/helper"
require "support/schema_dumping_helper"
require "models/default"
require "models/entrant"

class DefaultTest < ActiveRecord::TestCase
  def test_nil_defaults_for_not_null_columns
    %w(id name course_id).each do |name|
      column = Entrant.columns_hash[name]
      assert !column.null, "#{name} column should be NOT NULL"
      assert_not column.default, "#{name} column should be DEFAULT 'nil'"
    end
  end

  if current_adapter?(:PostgreSQLAdapter)
    def test_multiline_default_text
      record = Default.new
      # older postgres versions represent the default with escapes ("\\012" for a newline)
      assert("--- []\n\n" == record.multiline_default || "--- []\\012\\012" == record.multiline_default)
    end
  end
end

class DefaultNumbersTest < ActiveRecord::TestCase
  class DefaultNumber < ActiveRecord::Base; end

  setup do
    @connection = ActiveRecord::Base.connection
    @connection.create_table :default_numbers do |t|
      t.integer :positive_integer, default: 7
      t.integer :negative_integer, default: -5
      t.decimal :decimal_number, default: "2.78", precision: 5, scale: 2
    end
  end

  teardown do
    @connection.drop_table :default_numbers, if_exists: true
  end

  def test_default_positive_integer
    record = DefaultNumber.new
    assert_equal 7, record.positive_integer
    assert_equal "7", record.positive_integer_before_type_cast
  end

  def test_default_negative_integer
    record = DefaultNumber.new
    assert_equal (-5), record.negative_integer
    assert_equal "-5", record.negative_integer_before_type_cast
  end

  def test_default_decimal_number
    record = DefaultNumber.new
    assert_equal BigDecimal.new("2.78"), record.decimal_number
    assert_equal "2.78", record.decimal_number_before_type_cast
  end
end

class DefaultStringsTest < ActiveRecord::TestCase
  class DefaultString < ActiveRecord::Base; end

  setup do
    @connection = ActiveRecord::Base.connection
    @connection.create_table :default_strings do |t|
      t.string :string_col, default: "Smith"
      t.string :string_col_with_quotes, default: "O'Connor"
    end
    DefaultString.reset_column_information
  end

  def test_default_strings
    assert_equal "Smith", DefaultString.new.string_col
  end

  def test_default_strings_containing_single_quotes
    assert_equal "O'Connor", DefaultString.new.string_col_with_quotes
  end

  teardown do
    @connection.drop_table :default_strings
  end
end

if current_adapter?(:PostgreSQLAdapter)
  class PostgresqlDefaultExpressionTest < ActiveRecord::TestCase
    include SchemaDumpingHelper

    test "schema dump includes default expression" do
      output = dump_table_schema("defaults")
      assert_match %r/t\.date\s+"modified_date",\s+default: -> { "\('now'::text\)::date" }/, output
      assert_match %r/t\.date\s+"modified_date_function",\s+default: -> { "now\(\)" }/, output
      assert_match %r/t\.datetime\s+"modified_time",\s+default: -> { "now\(\)" }/, output
      assert_match %r/t\.datetime\s+"modified_time_function",\s+default: -> { "now\(\)" }/, output
    end
  end
end

if current_adapter?(:Mysql2Adapter)
  class MysqlDefaultExpressionTest < ActiveRecord::TestCase
    include SchemaDumpingHelper

    if ActiveRecord::Base.connection.version >= "5.6.0"
      test "schema dump datetime includes default expression" do
        output = dump_table_schema("datetime_defaults")
        assert_match %r/t\.datetime\s+"modified_datetime",\s+default: -> { "CURRENT_TIMESTAMP" }/, output
      end
    end

    test "schema dump timestamp includes default expression" do
      output = dump_table_schema("timestamp_defaults")
      assert_match %r/t\.timestamp\s+"modified_timestamp",\s+default: -> { "CURRENT_TIMESTAMP" }/, output
    end

    test "schema dump timestamp without default expression" do
      output = dump_table_schema("timestamp_defaults")
      assert_match %r/t\.timestamp\s+"nullable_timestamp"$/, output
    end
  end

  class DefaultsTestWithoutTransactionalFixtures < ActiveRecord::TestCase
    # ActiveRecord::Base#create! (and #save and other related methods) will
    # open a new transaction. When in transactional tests mode, this will
    # cause Active Record to create a new savepoint. However, since MySQL doesn't
    # support DDL transactions, creating a table will result in any created
    # savepoints to be automatically released. This in turn causes the savepoint
    # release code in AbstractAdapter#transaction to fail.
    #
    # We don't want that to happen, so we disable transactional tests here.
    self.use_transactional_tests = false

    def using_strict(strict)
      connection = ActiveRecord::Base.remove_connection
      ActiveRecord::Base.establish_connection connection.merge(strict: strict)
      yield
    ensure
      ActiveRecord::Base.remove_connection
      ActiveRecord::Base.establish_connection connection
    end

    # Strict mode controls how MySQL handles invalid or missing values
    # in data-change statements such as INSERT or UPDATE. A value can be
    # invalid for several reasons. For example, it might have the wrong
    # data type for the column, or it might be out of range. A value is
    # missing when a new row to be inserted does not contain a value for
    # a non-NULL column that has no explicit DEFAULT clause in its definition.
    # (For a NULL column, NULL is inserted if the value is missing.)
    #
    # If strict mode is not in effect, MySQL inserts adjusted values for
    # invalid or missing values and produces warnings. In strict mode,
    # you can produce this behavior by using INSERT IGNORE or UPDATE IGNORE.
    #
    # https://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#sql-mode-strict
    def test_mysql_not_null_defaults_non_strict
      using_strict(false) do
        with_mysql_not_null_table do |klass|
          record = klass.new
          assert_nil record.non_null_integer
          assert_nil record.non_null_string
          assert_nil record.non_null_text
          assert_nil record.non_null_blob

          record.save!
          record.reload

          assert_equal 0,  record.non_null_integer
          assert_equal "", record.non_null_string
          assert_equal "", record.non_null_text
          assert_equal "", record.non_null_blob
        end
      end
    end

    def test_mysql_not_null_defaults_strict
      using_strict(true) do
        with_mysql_not_null_table do |klass|
          record = klass.new
          assert_nil record.non_null_integer
          assert_nil record.non_null_string
          assert_nil record.non_null_text
          assert_nil record.non_null_blob

          assert_raises(ActiveRecord::NotNullViolation) { klass.create }
        end
      end
    end

    def with_mysql_not_null_table
      klass = Class.new(ActiveRecord::Base)
      klass.table_name = "test_mysql_not_null_defaults"
      klass.connection.create_table klass.table_name do |t|
        t.integer :non_null_integer, null: false
        t.string  :non_null_string,  null: false
        t.text    :non_null_text,    null: false
        t.blob    :non_null_blob,    null: false
      end

      yield klass
    ensure
      klass.connection.drop_table(klass.table_name) rescue nil
    end
  end
end