#-- encoding: UTF-8
#-- copyright
# OpenProject is a project management system.
#
# Copyright (C) 2012-2013 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# See doc/COPYRIGHT.rdoc for more details.
#++

namespace :migrations do
  namespace :timelines do
    def name_map
      # note that 20120215093215_add_indexes_to_timelines_models.rb of the timelines plugins was
      # removed without replacement and that the contents of it was put into a multitude of migrations
      @name_map ||= { "20110929081301-chiliproject_timelines" => "20130409133700",
                      "20110929083343-chiliproject_timelines" => "20130409133701",
                      "20110929144754-chiliproject_timelines" => "20130409133702",
                      "20110930125321-chiliproject_timelines" => "20130409133703",
                      "20111005114335-chiliproject_timelines" => "20130409133704",
                      "20111005133556-chiliproject_timelines" => "20130409133705",
                      "20111006070115-chiliproject_timelines" => "20130409133706",
                      "20111108075045-chiliproject_timelines" => "20130409133707",
                      "20111108134440-chiliproject_timelines" => "20130409133708",
                      "20111108145338-chiliproject_timelines" => "20130409133709",
                      "20111122083825-chiliproject_timelines" => "20130409133710",
                      "20120106155245-chiliproject_timelines" => "20130409133711",
                      "20120109111640-chiliproject_timelines" => "20130409133712",
                      "20120109140237-chiliproject_timelines" => "20130409133713",
                      "20120109153625-chiliproject_timelines" => "20130409133714",
                      "20120206165120-chiliproject_timelines" => "20130409133715",
                      "20120215093215-chiliproject_timelines" => nil             ,
                      "20120221143844-chiliproject_timelines" => "20130409133717",
                      "20120221144552-chiliproject_timelines" => "20130409133718",
                      "20120306161515-chiliproject_timelines" => "20130409133719",
                      "20120322111436-chiliproject_timelines" => "20130409133720",
                      "20120518151232-chiliproject_timelines" => "20130409133721",
                      "20120522094843-chiliproject_timelines" => "20130409133722",
                      "20120524130128-chiliproject_timelines" => "20130409133723" }
    end

    def new_name_of(old_name)
      name_map[old_name]
    end

    def old_migration_names
      name_map.keys
    end

    def migrations_to_remove
      ["20120215093215-chiliproject_timelines"]
    end

    def quote_value name
      ActiveRecord::Base.connection.quote name
    end

    def schema_name
      ActiveRecord::Base.connection.quote_table_name "schema_migrations"
    end

    def remove_migrations
      migrations_to_remove.each do |migration_name|
        puts migration_name

        ActiveRecord::Base.connection.execute <<-SQL
          DELETE FROM #{schema_name}
          WHERE version=#{quote_value(migration_name)}
        SQL
      end
    end

    def rename_migrations
      old_migration_names.each do |migration_name|
        puts migration_name
        new_name = new_name_of(migration_name)

        ActiveRecord::Base.connection.execute <<-SQL
          UPDATE #{schema_name}
          SET version=#{quote_value(new_name)}
          WHERE version=#{quote_value(migration_name)}
        SQL
      end
    end

    desc "rewrites existing timelines migrations to the newly named migrations"
    task :reregister => :environment do |task|
      remove_migrations
      rename_migrations
    end
  end
end