class AssignTaskCommand < Command
  attribute :task, Task
  attribute :owner, User
  attribute :due_at, DateTime
  attribute :created_by, User
  attribute :comments, String
  attribute :distribute_at, DateTime
  attribute :distribute_rule_name, String
  attribute :assign_case, Integer

  validates :task, :owner, presence: true

  def initialize(params)
    self.attributes = {
        task: params[:task] || (params.has_key?(:task_id) && Task.find(params[:task_id])),
        owner: params[:owner] || (params.has_key?(:owner_id) && User.find(params[:owner_id])),
        due_at: params[:due_at] || Task.default_due_date,
        created_by: params[:created_by] || (params[:created_by_id] && User.find(params[:created_by_id])),
        distribute_at: params[:distribute_at],
        distribute_rule_name: params[:distribute_rule_name],
        comments: params[:comments],
        assign_case: params[:assign_case]
    }
  end

  protected
  def format_activity_comment
    result = "Task assigned to #{owner.full_name}"
    result << "; #{comments}" if comments
  end

  def format_case_assignment_comment
    result = 'Case assignment followed task assignment'
    result << "; #{comments}" if comments
  end

  def execute_self
    @previous_owner = task.owner
    task.owner = owner
    task.due_at = due_at if task.due_at.nil? || due_at.nil? || due_at > task.due_at
    self.task.distribute_at = distribute_at
    self.task.distribute_rule_name = distribute_rule_name
    task.save
  end

  def prepare_sub_commands
    cmds = [CreateActivityCommand.new(case: task.case, task: task, created_by: created_by, activity_type: 'TASKASSIGNED', comments: format_activity_comment)]
    case
      when assign_case == AssignCase::UNASSIGNED && task.case.owner.nil?
        cmds << AssignCaseCommand.new(case: task.case, owner: owner, comments: format_case_assignment_comment)
      when assign_case == AssignCase::ALWAYS
        cmds << AssignCaseCommand.new(case: task.case, owner: owner, comments: format_case_assignment_comment)
    end

    cmds
  end
end