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

class Mysql2ConnectionTest < ActiveRecord::Mysql2TestCase
  include ConnectionHelper

  fixtures :comments

  def setup
    super
    @subscriber = SQLSubscriber.new
    @subscription = ActiveSupport::Notifications.subscribe("sql.active_record", @subscriber)
    @connection = ActiveRecord::Base.connection
  end

  def teardown
    ActiveSupport::Notifications.unsubscribe(@subscription)
    super
  end

  def test_bad_connection
    assert_raise ActiveRecord::NoDatabaseError do
      configuration = ActiveRecord::Base.configurations["arunit"].merge(database: "inexistent_activerecord_unittest")
      connection = ActiveRecord::Base.mysql2_connection(configuration)
      connection.drop_table "ex", if_exists: true
    end
  end

  def test_truncate
    rows = ActiveRecord::Base.connection.exec_query("select count(*) from comments")
    count = rows.first.values.first
    assert_operator count, :>, 0

    ActiveRecord::Base.connection.truncate("comments")
    rows = ActiveRecord::Base.connection.exec_query("select count(*) from comments")
    count = rows.first.values.first
    assert_equal 0, count
  end

  def test_no_automatic_reconnection_after_timeout
    assert @connection.active?
    @connection.update("set @@wait_timeout=1")
    sleep 2
    assert !@connection.active?

    # Repair all fixture connections so other tests won't break.
    @fixture_connections.each(&:verify!)
  end

  def test_successful_reconnection_after_timeout_with_manual_reconnect
    assert @connection.active?
    @connection.update("set @@wait_timeout=1")
    sleep 2
    @connection.reconnect!
    assert @connection.active?
  end

  def test_successful_reconnection_after_timeout_with_verify
    assert @connection.active?
    @connection.update("set @@wait_timeout=1")
    sleep 2
    @connection.verify!
    assert @connection.active?
  end

  def test_mysql_connection_collation_is_configured
    assert_equal "utf8_unicode_ci", @connection.show_variable("collation_connection")
    assert_equal "utf8_general_ci", ARUnit2Model.connection.show_variable("collation_connection")
  end

  def test_mysql_default_in_strict_mode
    result = @connection.select_value("SELECT @@SESSION.sql_mode")
    assert_match %r(STRICT_ALL_TABLES), result
  end

  def test_mysql_strict_mode_disabled
    run_without_connection do |orig_connection|
      ActiveRecord::Base.establish_connection(orig_connection.merge(strict: false))
      result = ActiveRecord::Base.connection.select_value("SELECT @@SESSION.sql_mode")
      assert_no_match %r(STRICT_ALL_TABLES), result
    end
  end

  def test_mysql_strict_mode_specified_default
    run_without_connection do |orig_connection|
      ActiveRecord::Base.establish_connection(orig_connection.merge(strict: :default))
      global_sql_mode = ActiveRecord::Base.connection.select_value("SELECT @@GLOBAL.sql_mode")
      session_sql_mode = ActiveRecord::Base.connection.select_value("SELECT @@SESSION.sql_mode")
      assert_equal global_sql_mode, session_sql_mode
    end
  end

  def test_mysql_sql_mode_variable_overrides_strict_mode
    run_without_connection do |orig_connection|
      ActiveRecord::Base.establish_connection(orig_connection.deep_merge(variables: { "sql_mode" => "ansi" }))
      result = ActiveRecord::Base.connection.select_value("SELECT @@SESSION.sql_mode")
      assert_no_match %r(STRICT_ALL_TABLES), result
    end
  end

  def test_passing_arbitary_flags_to_adapter
    run_without_connection do |orig_connection|
      ActiveRecord::Base.establish_connection(orig_connection.merge(flags: Mysql2::Client::COMPRESS))
      assert_equal (Mysql2::Client::COMPRESS |  Mysql2::Client::FOUND_ROWS), ActiveRecord::Base.connection.raw_connection.query_options[:flags]
    end
  end

  def test_passing_flags_by_array_to_adapter
    run_without_connection do |orig_connection|
      ActiveRecord::Base.establish_connection(orig_connection.merge(flags: ["COMPRESS"]))
      assert_equal ["COMPRESS", "FOUND_ROWS"], ActiveRecord::Base.connection.raw_connection.query_options[:flags]
    end
  end

  def test_mysql_set_session_variable
    run_without_connection do |orig_connection|
      ActiveRecord::Base.establish_connection(orig_connection.deep_merge(variables: { default_week_format: 3 }))
      session_mode = ActiveRecord::Base.connection.exec_query "SELECT @@SESSION.DEFAULT_WEEK_FORMAT"
      assert_equal 3, session_mode.rows.first.first.to_i
    end
  end

  def test_mysql_set_session_variable_to_default
    run_without_connection do |orig_connection|
      ActiveRecord::Base.establish_connection(orig_connection.deep_merge(variables: { default_week_format: :default }))
      global_mode = ActiveRecord::Base.connection.exec_query "SELECT @@GLOBAL.DEFAULT_WEEK_FORMAT"
      session_mode = ActiveRecord::Base.connection.exec_query "SELECT @@SESSION.DEFAULT_WEEK_FORMAT"
      assert_equal global_mode.rows, session_mode.rows
    end
  end

  def test_logs_name_show_variable
    @connection.show_variable "foo"
    assert_equal "SCHEMA", @subscriber.logged[0][1]
  end

  def test_logs_name_rename_column_sql
    @connection.execute "CREATE TABLE `bar_baz` (`foo` varchar(255))"
    @subscriber.logged.clear
    @connection.send(:rename_column_sql, "bar_baz", "foo", "foo2")
    assert_equal "SCHEMA", @subscriber.logged[0][1]
  ensure
    @connection.execute "DROP TABLE `bar_baz`"
  end

  def test_get_and_release_advisory_lock
    lock_name = "test lock'n'name"

    got_lock = @connection.get_advisory_lock(lock_name)
    assert got_lock, "get_advisory_lock should have returned true but it didn't"

    assert_equal test_lock_free(lock_name), false,
      "expected the test advisory lock to be held but it wasn't"

    released_lock = @connection.release_advisory_lock(lock_name)
    assert released_lock, "expected release_advisory_lock to return true but it didn't"

    assert test_lock_free(lock_name), "expected the test lock to be available after releasing"
  end

  def test_release_non_existent_advisory_lock
    lock_name = "fake lock'n'name"
    released_non_existent_lock = @connection.release_advisory_lock(lock_name)
    assert_equal released_non_existent_lock, false,
      "expected release_advisory_lock to return false when there was no lock to release"
  end

  protected

    def test_lock_free(lock_name)
      @connection.select_value("SELECT IS_FREE_LOCK(#{@connection.quote(lock_name)})") == 1
    end
end