require "cases/helper"
require 'active_record/schema_dumper'
require 'stringio'

if ActiveRecord::Base.connection.respond_to?(:tables)

  class SchemaDumperTest < ActiveRecord::TestCase
    def standard_dump
      stream = StringIO.new
      ActiveRecord::SchemaDumper.ignore_tables = []
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
      stream.string
    end

    def test_schema_dump
      output = standard_dump
      assert_match %r{create_table "accounts"}, output
      assert_match %r{create_table "authors"}, output
      assert_no_match %r{create_table "schema_migrations"}, output
    end

    def test_schema_dump_excludes_sqlite_sequence
      output = standard_dump
      assert_no_match %r{create_table "sqlite_sequence"}, output
    end

    def assert_line_up(lines, pattern, required = false)
      return assert(true) if lines.empty?
      matches = lines.map { |line| line.match(pattern) }
      assert matches.all? if required
      matches.compact!
      return assert(true) if matches.empty?
      assert_equal 1, matches.map{ |match| match.offset(0).first }.uniq.length
    end

    def column_definition_lines(output = standard_dump)
      output.scan(/^( *)create_table.*?\n(.*?)^\1end/m).map{ |m| m.last.split(/\n/) }
    end

    def test_types_line_up
      column_definition_lines.each do |column_set|
        next if column_set.empty?

        lengths = column_set.map do |column|
          if match = column.match(/t\.(?:integer|decimal|float|datetime|timestamp|time|date|text|binary|string|boolean)\s+"/)
            match[0].length
          end
        end

        assert_equal 1, lengths.uniq.length
      end
    end

    def test_arguments_line_up
      column_definition_lines.each do |column_set|
        assert_line_up(column_set, /:default => /)
        assert_line_up(column_set, /:limit => /)
        assert_line_up(column_set, /:null => /)
      end
    end

    def test_no_dump_errors
      output = standard_dump
      assert_no_match %r{\# Could not dump table}, output
    end

    def test_schema_dump_includes_not_null_columns
      stream = StringIO.new

      ActiveRecord::SchemaDumper.ignore_tables = [/^[^r]/]
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
      output = stream.string
      assert_match %r{:null => false}, output
    end

    def test_schema_dump_with_string_ignored_table
      stream = StringIO.new

      ActiveRecord::SchemaDumper.ignore_tables = ['accounts']
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
      output = stream.string
      assert_no_match %r{create_table "accounts"}, output
      assert_match %r{create_table "authors"}, output
      assert_no_match %r{create_table "schema_migrations"}, output
    end

    def test_schema_dump_with_regexp_ignored_table
      stream = StringIO.new

      ActiveRecord::SchemaDumper.ignore_tables = [/^account/]
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
      output = stream.string
      assert_no_match %r{create_table "accounts"}, output
      assert_match %r{create_table "authors"}, output
      assert_no_match %r{create_table "schema_migrations"}, output
    end

    def test_schema_dump_illegal_ignored_table_value
      stream = StringIO.new
      ActiveRecord::SchemaDumper.ignore_tables = [5]
      assert_raise(StandardError) do
        ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
      end
    end

    if current_adapter?(:MysqlAdapter)
      def test_schema_dump_should_not_add_default_value_for_mysql_text_field
        output = standard_dump
        assert_match %r{t.text\s+"body",\s+:null => false$}, output
      end

      def test_mysql_schema_dump_should_honor_nonstandard_primary_keys
        output = standard_dump
        match = output.match(%r{create_table "movies"(.*)do})
        assert_not_nil(match, "nonstandardpk table not found")
        assert_match %r(:primary_key => "movieid"), match[1], "non-standard primary key not preserved"
      end

      def test_schema_dump_includes_length_for_mysql_blob_and_text_fields
        output = standard_dump
        assert_match %r{t.binary\s+"tiny_blob",\s+:limit => 255$}, output
        assert_match %r{t.binary\s+"normal_blob"$}, output
        assert_match %r{t.binary\s+"medium_blob",\s+:limit => 16777215$}, output
        assert_match %r{t.binary\s+"long_blob",\s+:limit => 2147483647$}, output
        assert_match %r{t.text\s+"tiny_text",\s+:limit => 255$}, output
        assert_match %r{t.text\s+"normal_text"$}, output
        assert_match %r{t.text\s+"medium_text",\s+:limit => 16777215$}, output
        assert_match %r{t.text\s+"long_text",\s+:limit => 2147483647$}, output
      end
    end

    def test_schema_dump_includes_decimal_options
      stream = StringIO.new
      ActiveRecord::SchemaDumper.ignore_tables = [/^[^n]/]
      ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, stream)
      output = stream.string
      assert_match %r{:precision => 3,[[:space:]]+:scale => 2,[[:space:]]+:default => 2.78}, output
    end
  end

end