require "cases/helper"
require "support/schema_dumping_helper"

if ActiveRecord::Base.connection.supports_comments?
  class CommentTest < ActiveRecord::TestCase
    include SchemaDumpingHelper

    class Commented < ActiveRecord::Base
      self.table_name = "commenteds"
    end

    class BlankComment < ActiveRecord::Base
    end

    setup do
      @connection = ActiveRecord::Base.connection

      @connection.create_table("commenteds", comment: "A table with comment", force: true) do |t|
        t.string  "name",    comment: "Comment should help clarify the column purpose"
        t.boolean "obvious", comment: "Question is: should you comment obviously named objects?"
        t.string  "content"
        t.index   "name",    comment: %Q["Very important" index that powers all the performance.\nAnd it's fun!]
      end

      @connection.create_table("blank_comments", comment: " ", force: true) do |t|
        t.string :space_comment, comment: " "
        t.string :empty_comment, comment: ""
        t.string :nil_comment, comment: nil
        t.string :absent_comment
        t.index :space_comment, comment: " "
        t.index :empty_comment, comment: ""
        t.index :nil_comment, comment: nil
        t.index :absent_comment
      end

      Commented.reset_column_information
      BlankComment.reset_column_information
    end

    teardown do
      @connection.drop_table "commenteds", if_exists: true
      @connection.drop_table "blank_comments", if_exists: true
    end

    def test_column_created_in_block
      column = Commented.columns_hash["name"]
      assert_equal :string, column.type
      assert_equal "Comment should help clarify the column purpose", column.comment
    end

    def test_blank_columns_created_in_block
      %w[ space_comment empty_comment nil_comment absent_comment ].each do |field|
        column = BlankComment.columns_hash[field]
        assert_equal :string, column.type
        assert_nil column.comment
      end
    end

    def test_blank_indexes_created_in_block
      @connection.indexes("blank_comments").each do |index|
        assert_nil index.comment
      end
    end

    def test_add_column_with_comment_later
      @connection.add_column :commenteds, :rating, :integer, comment: "I am running out of imagination"
      Commented.reset_column_information
      column = Commented.columns_hash["rating"]

      assert_equal :integer, column.type
      assert_equal "I am running out of imagination", column.comment
    end

    def test_add_index_with_comment_later
      unless current_adapter?(:OracleAdapter)
        @connection.add_index :commenteds, :obvious, name: "idx_obvious", comment: "We need to see obvious comments"
        index = @connection.indexes("commenteds").find { |idef| idef.name == "idx_obvious" }
        assert_equal "We need to see obvious comments", index.comment
      end
    end

    def test_add_comment_to_column
      @connection.change_column :commenteds, :content, :string, comment: "Whoa, content describes itself!"

      Commented.reset_column_information
      column = Commented.columns_hash["content"]

      assert_equal :string, column.type
      assert_equal "Whoa, content describes itself!", column.comment
    end

    def test_remove_comment_from_column
      @connection.change_column :commenteds, :obvious, :string, comment: nil

      Commented.reset_column_information
      column = Commented.columns_hash["obvious"]

      assert_equal :string, column.type
      assert_nil column.comment
    end

    def test_schema_dump_with_comments
      # Do all the stuff from other tests
      @connection.add_column    :commenteds, :rating, :integer, comment: "I am running out of imagination"
      @connection.change_column :commenteds, :content, :string, comment: "Whoa, content describes itself!"
      @connection.change_column :commenteds, :content, :string
      @connection.change_column :commenteds, :obvious, :string, comment: nil
      @connection.add_index     :commenteds, :obvious, name: "idx_obvious", comment: "We need to see obvious comments"

      # And check that these changes are reflected in dump
      output = dump_table_schema "commenteds"
      assert_match %r[create_table "commenteds",.+\s+comment: "A table with comment"], output
      assert_match %r[t\.string\s+"name",\s+comment: "Comment should help clarify the column purpose"], output
      assert_match %r[t\.string\s+"obvious"\n], output
      assert_match %r[t\.string\s+"content",\s+comment: "Whoa, content describes itself!"], output
      if current_adapter?(:OracleAdapter)
        assert_match %r[t\.integer\s+"rating",\s+precision: 38,\s+comment: "I am running out of imagination"], output
      else
        assert_match %r[t\.integer\s+"rating",\s+comment: "I am running out of imagination"], output
      end
      unless current_adapter?(:OracleAdapter)
        assert_match %r[t\.index\s+.+\s+comment: "\\\"Very important\\\" index that powers all the performance.\\nAnd it's fun!"], output
        assert_match %r[t\.index\s+.+\s+name: "idx_obvious",\s+comment: "We need to see obvious comments"], output
      end
    end

    def test_schema_dump_omits_blank_comments
      output = dump_table_schema "blank_comments"

      assert_match %r[create_table "blank_comments"], output
      assert_no_match %r[create_table "blank_comments",.+comment:], output

      assert_match %r[t\.string\s+"space_comment"\n], output
      assert_no_match %r[t\.string\s+"space_comment", comment:\n], output

      assert_match %r[t\.string\s+"empty_comment"\n], output
      assert_no_match %r[t\.string\s+"empty_comment", comment:\n], output

      assert_match %r[t\.string\s+"nil_comment"\n], output
      assert_no_match %r[t\.string\s+"nil_comment", comment:\n], output

      assert_match %r[t\.string\s+"absent_comment"\n], output
      assert_no_match %r[t\.string\s+"absent_comment", comment:\n], output
    end
  end
end