# Copyright (c) 2011 - 2013, SoundCloud Ltd., Rany Keddo, Tobias Bielohlawek, Tobias
# Schmidt

require File.expand_path(File.dirname(__FILE__)) + '/integration_helper'

describe Lhm do
  include IntegrationHelper

  before(:each) { connect_master! }

  describe 'changes' do
    before(:each) do
      table_create(:users)
      table_create(:tracks)
      table_create(:permissions)
    end

    describe 'when providing a subset of data to copy' do

      before do
        execute('insert into tracks set id = 13, public = 0')
        11.times { |n| execute("insert into tracks set id = #{n + 1}, public = 1") }
        11.times { |n| execute("insert into permissions set track_id = #{n + 1}") }

        Lhm.change_table(:permissions, :atomic_switch => false) do |t|
          t.filter('inner join tracks on tracks.`id` = permissions.`track_id` and tracks.`public` = 1')
        end
      end

      describe 'when no additional data is inserted into the table' do

        it 'migrates the existing data' do
          slave do
            count_all(:permissions).must_equal(11)
          end
        end
      end

      describe 'when additional data is inserted' do

        before do
          execute('insert into tracks set id = 14, public = 0')
          execute('insert into tracks set id = 15, public = 1')
          execute('insert into permissions set track_id = 14')
          execute('insert into permissions set track_id = 15')
        end

        it 'migrates all data' do
          slave do
            count_all(:permissions).must_equal(13)
          end
        end
      end
    end

    it 'should add a column' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.add_column(:logins, "INT(12) DEFAULT '0'")
      end

      slave do
        table_read(:users).columns['logins'].must_equal({
          :type => 'int(12)',
          :is_nullable => 'YES',
          :column_default => '0'
        })
      end
    end

    it 'should copy all rows' do
      23.times { |n| execute("insert into users set reference = '#{ n }'") }

      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.add_column(:logins, "INT(12) DEFAULT '0'")
      end

      slave do
        count_all(:users).must_equal(23)
      end
    end

    it 'should remove a column' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.remove_column(:comment)
      end

      slave do
        table_read(:users).columns['comment'].must_equal nil
      end
    end

    it 'should add an index' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.add_index([:comment, :created_at])
      end

      slave do
        index_on_columns?(:users, [:comment, :created_at]).must_equal(true)
      end
    end

    it 'should add an index with a custom name' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.add_index([:comment, :created_at], :my_index_name)
      end

      slave do
        index?(:users, :my_index_name).must_equal(true)
      end
    end

    it 'should add an index on a column with a reserved name' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.add_index(:group)
      end

      slave do
        index_on_columns?(:users, :group).must_equal(true)
      end
    end

    it 'should add a unqiue index' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.add_unique_index(:comment)
      end

      slave do
        index_on_columns?(:users, :comment, :unique).must_equal(true)
      end
    end

    it 'should remove an index' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.remove_index([:username, :created_at])
      end

      slave do
        index_on_columns?(:users, [:username, :created_at]).must_equal(false)
      end
    end

    it 'should remove an index with a custom name' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.remove_index([:username, :group])
      end

      slave do
        index?(:users, :index_with_a_custom_name).must_equal(false)
      end
    end

    it 'should remove an index with a custom name by name' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.remove_index(:irrelevant_column_name, :index_with_a_custom_name)
      end

      slave do
        index?(:users, :index_with_a_custom_name).must_equal(false)
      end
    end

    it 'should apply a ddl statement' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.ddl('alter table %s add column flag tinyint(1)' % t.name)
      end

      slave do
        table_read(:users).columns['flag'].must_equal({
          :type => 'tinyint(1)',
          :is_nullable => 'YES',
          :column_default => nil
        })
      end
    end

    it 'should change a column' do
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.change_column(:comment, "varchar(20) DEFAULT 'none' NOT NULL")
      end

      slave do
        table_read(:users).columns['comment'].must_equal({
          :type => 'varchar(20)',
          :is_nullable => 'NO',
          :column_default => 'none'
        })
      end
    end

    it 'should change the last column in a table' do
      table_create(:small_table)

      Lhm.change_table(:small_table, :atomic_switch => false) do |t|
        t.change_column(:id, 'int(5)')
      end

      slave do
        table_read(:small_table).columns['id'].must_equal({
          :type => 'int(5)',
          :is_nullable => 'NO',
          :column_default => '0'
        })
      end
    end

    it 'should rename a column' do
      table_create(:users)

      execute("INSERT INTO users (username) VALUES ('a user')")
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.rename_column(:username, :login)
      end

      slave do
        table_data = table_read(:users)
        table_data.columns['username'].must_equal(nil)
        table_read(:users).columns['login'].must_equal({
          :type => 'varchar(255)',
          :is_nullable => 'YES',
          :column_default => nil
        })

        # DM & AR versions of select_one return different structures. The
        # real test is whether the data was copied
        result = select_one('SELECT login from users')
        result = result['login'] if result.respond_to?(:has_key?)
        result.must_equal('a user')
      end
    end

    it 'should rename a column with a default' do
      table_create(:users)

      execute("INSERT INTO users (username) VALUES ('a user')")
      Lhm.change_table(:users, :atomic_switch => false) do |t|
        t.rename_column(:group, :fnord)
      end

      slave do
        table_data = table_read(:users)
        table_data.columns['group'].must_equal(nil)
        table_read(:users).columns['fnord'].must_equal({
          :type => 'varchar(255)',
          :is_nullable => 'YES',
          :column_default => 'Superfriends'
        })

        # DM & AR versions of select_one return different structures. The
        # real test is whether the data was copied
        result = select_one('SELECT `fnord` from users')
        result = result['fnord'] if result.respond_to?(:has_key?)
        result.must_equal('Superfriends')
      end
    end

    it 'works when mysql reserved words are used' do
      table_create(:lines)
      execute("insert into `lines` set id = 1, `between` = 'foo'")
      execute("insert into `lines` set id = 2, `between` = 'bar'")

      Lhm.change_table(:lines) do |t|
        t.add_column('by', 'varchar(10)')
        t.remove_column('lines')
        t.add_index('by')
        t.add_unique_index('between')
        t.remove_index('by')
      end

      slave do
        table_read(:lines).columns.must_include 'by'
        table_read(:lines).columns.wont_include 'lines'
        index_on_columns?(:lines, ['between'], :unique).must_equal true
        index_on_columns?(:lines, ['by']).must_equal false
        count_all(:lines).must_equal(2)
      end
    end

    describe 'parallel' do
      it 'should perserve inserts during migration' do
        50.times { |n| execute("insert into users set reference = '#{ n }'") }

        insert = Thread.new do
          10.times do |n|
            connect_master!
            execute("insert into users set reference = '#{ 100 + n }'")
            sleep(0.17)
          end
        end
        sleep 2

        options = { :stride => 10, :throttle => 97, :atomic_switch => false }
        Lhm.change_table(:users, options) do |t|
          t.add_column(:parallel, "INT(10) DEFAULT '0'")
        end

        insert.join

        slave do
          count_all(:users).must_equal(60)
        end
      end

      it 'should perserve deletes during migration' do
        50.times { |n| execute("insert into users set reference = '#{ n }'") }

        delete = Thread.new do
          10.times do |n|
            execute("delete from users where id = '#{ n + 1 }'")
            sleep(0.17)
          end
        end
        sleep 2

        options = { :stride => 10, :throttle => 97, :atomic_switch => false }
        Lhm.change_table(:users, options) do |t|
          t.add_column(:parallel, "INT(10) DEFAULT '0'")
        end

        delete.join

        slave do
          count_all(:users).must_equal(40)
        end
      end
    end
  end
end