# p4util/task.rb - Rake tasks

require 'commands'
require 'conventions'
require 'fileutils'
require 'ostruct'
require 'rake/tasklib'

module P4Util
  # Creates a few tasks to allow launching init and kill commands via rake
  # tasks, which should make it easy to script with test tasks, for example.
  #
  # Example:
  #
  #     require 'p4util/tasks'
  #
  #     P4Util::Tasks.new do |p4util|
  #       p4util.version = 'r14.2' # Indicate p4d version to download
  #     end
  #
  # Tasks:
  # - p4init
  # - p4kill
  # - p4reset
  class Tasks < Rake::TaskLib
    # The task base name, defaults to ':p4'
    attr_accessor :basename

    # P4 Version to use, defaults to 'r14.2'
    attr_accessor :version

    # The directory containing p4 init scripts, defaults to 'p4init'
    attr_accessor :p4_init_dir

    def initialize basename = :p4
      @basename = basename
      @version = 'r14.2'
      @p4_init_dir = 'p4init'

      yield self if block_given?

      define_tasks
    end

    # Create the tasks defined by this task library
    def define_tasks
      desc init_task_description
      task init_task_name do
        options = OpenStruct.new
        options.params = [p4_init_dir, '--version', version]
        Commands.init(options)
      end

      desc kill_task_description
      task kill_task_name do
        options = OpenStruct.new
        options.params = ['--version', version]
        Commands.kill(options)
      end

      desc reset_task_description
      task reset_task_name => kill_task_name do
        FileUtils.rmtree(Conventions.p4droot_dir)
      end

      self
    end

    def init_task_description
      "Initializes a p4d instance, and ensures it's downloaded and running"
    end

    def init_task_name
      "#{basename}init"
    end

    def kill_task_description
      'Halt any locally running p4d instance'
    end

    def kill_task_name
      "#{basename}kill"
    end

    def reset_task_description
      'Cleans out the current p4droot working directory (after killing p4d)'
    end

    def reset_task_name
      "#{basename}reset"
    end
  end
end