require "cases/helper"

class CopyTableTest < ActiveRecord::SQLite3TestCase
  fixtures :customers

  def setup
    @connection = ActiveRecord::Base.connection
    class << @connection
      public :copy_table, :table_structure, :indexes
    end
  end

  def test_copy_table(from = "customers", to = "customers2", options = {})
    assert_nothing_raised { copy_table(from, to, options) }
    assert_equal row_count(from), row_count(to)

    if block_given?
      yield from, to, options
    else
      assert_equal column_names(from), column_names(to)
    end

    @connection.drop_table(to) rescue nil
  end

  def test_copy_table_renaming_column
    test_copy_table("customers", "customers2",
        rename: { "name" => "person_name" }) do |from, to, options|
      expected = column_values(from, "name")
      assert_equal expected, column_values(to, "person_name")
      assert expected.any?, "No values in table: #{expected.inspect}"
    end
  end

  def test_copy_table_allows_to_pass_options_to_create_table
    @connection.create_table("blocker_table")
    test_copy_table("customers", "blocker_table", force: true)
  end

  def test_copy_table_with_index
    test_copy_table("comments", "comments_with_index") do
      @connection.add_index("comments_with_index", ["post_id", "type"])
      test_copy_table("comments_with_index", "comments_with_index2") do
        assert_nil table_indexes_without_name("comments_with_index")
        assert_nil table_indexes_without_name("comments_with_index2")
      end
    end
  end

  def test_copy_table_without_primary_key
    test_copy_table("developers_projects", "programmers_projects") do
      assert_nil @connection.primary_key("programmers_projects")
    end
  end

  def test_copy_table_with_id_col_that_is_not_primary_key
    test_copy_table("goofy_string_id", "goofy_string_id2") do
      original_id = @connection.columns("goofy_string_id").detect { |col| col.name == "id" }
      copied_id = @connection.columns("goofy_string_id2").detect { |col| col.name == "id" }
      assert_equal original_id.type, copied_id.type
      assert_equal original_id.sql_type, copied_id.sql_type
      assert_nil original_id.limit
      assert_nil copied_id.limit
    end
  end

  def test_copy_table_with_unconventional_primary_key
    test_copy_table("owners", "owners_unconventional") do
      original_pk = @connection.primary_key("owners")
      copied_pk = @connection.primary_key("owners_unconventional")
      assert_equal original_pk, copied_pk
    end
  end

  def test_copy_table_with_binary_column
    test_copy_table "binaries", "binaries2"
  end

private
  def copy_table(from, to, options = {})
    @connection.copy_table(from, to, { temporary: true }.merge(options))
  end

  def column_names(table)
    @connection.table_structure(table).map { |column| column["name"] }
  end

  def column_values(table, column)
    @connection.select_all("SELECT #{column} FROM #{table} ORDER BY id").map { |row| row[column] }
  end

  def table_indexes_without_name(table)
    @connection.indexes(table).delete(:name)
  end

  def row_count(table)
    @connection.select_one("SELECT COUNT(*) AS count FROM #{table}")["count"]
  end
end