quotation_workflow.rb

class QuotationWorkflow

  def initialize(object)
    @object = object
  end

  include Workflow

  workflow do
    state :created do
      event :approve, :transitions_to => :approved, :if => Proc.new{|t| t.approvable? }
      event :reject, :transitions_to => :rejected, :if => Proc.new{|t| t.rejectable? }
      event :hold, :transitions_to => :on_hold, :if => Proc.new{|t| t.on_holdable? }
      event :expire, :transitions_to => :expired, :if => Proc.new{|t| t.expirable? }
      event :callback, :transitions_to => :callback, :if => Proc.new{|t| t.callbackable? }
    end
    state :approved do
      event :send_quotation, :transitions_to => :sent, :if => Proc.new{|t| t.sendable? }
      event :reject, :transitions_to => :rejected, :if => Proc.new{|t| t.rejectable? }
      event :hold, :transitions_to => :on_hold, :if => Proc.new{|t| t.on_holdable? }
      event :pay, :transitions_to => :paid, :if => Proc.new{|t| t.payable? }
      event :expire, :transitions_to => :expired, :if => Proc.new{|t| t.expirable? }
    end
    state :sent do
      event :send_quotation, :transitions_to => :sent, :if => Proc.new{|t| t.sendable? }
      event :pay, :transitions_to => :paid, :if => Proc.new{|t| t.payable? }
      event :expire, :transitions_to => :expired, :if => Proc.new{|t| t.expirable? }
    end
    state :on_hold do
      event :approve, :transitions_to => :approved, :if => Proc.new{|t| t.approvable? }
      event :reject, :transitions_to => :rejected, :if => Proc.new{|t| t.rejectable? }
      event :expire, :transitions_to => :expired, :if => Proc.new{|t| t.expirable? }
      event :callback, :transitions_to => :callback, :if => Proc.new{|t| t.callbackable? }
    end
    state :rejected do
      event :approve, :transitions_to => :approved, :if => Proc.new{|t| t.approvable? }
      event :hold, :transitions_to => :on_hold, :if => Proc.new{|t| t.on_holdable? }
      event :expire, :transitions_to => :expired, :if => Proc.new{|t| t.expirable? }
    end
    state :paid do
      event :expire, :transitions_to => :expired, :if => Proc.new{|t| t.expirable? }
    end
    state :expired
    state :callback do
      event :approve, :transitions_to => :approved, :if => Proc.new{|t| t.approvable? }
      event :reject, :transitions_to => :rejected, :if => Proc.new{|t| t.rejectable? }
      event :hold, :transitions_to => :on_hold, :if => Proc.new{|t| t.on_holdable? }
      event :callback, :transitions_to => :callback, :if => Proc.new{|t| t.callbackable? }
    end

    before_transition do |from, to, event, *event_args|
      self.callback_at = nil unless event == :callback
    end

    on_transition do |from, to, event, *event_args|
      valid?
      doer = event_args[0]
      halt "Not Authorised" unless Ability.new(doer).can?(event, self)
      al = ActivityLog.new(:from => from, :to => to, :event => event, :user => self.intended_trip.user,
                         :staff => (doer if doer.class == Staff), :parent_model => self.class.to_s, :parent_id => self.id)
      al.save
    end

  end

  def send_quotation(doer, params = {})
    valid?
    UserMailer.quotation(self).deliver
    self.sent_at = DateTime.now
    Transaction.all(:amount.lte => 0, :quotation => @object).destroy
    t = Transaction.create(:amount => -quoted_price, :date => Date.today, :user => intended_trip.user, :created_by => doer, :comment => "#{doer.email} sent quotation", :quotation => self)
  end

  def pay(doer, params = {})
    t = Transaction.create(:amount => quoted_price, :date => Date.today, :user => self.intended_trip.user, :created_by => doer, :comment => "#{doer.email} marked as 'Paid'", :quotation => self)
  end

  def callback(user, params)
    self.callback_at = params[:callback_at] unless attribute_dirty?(:callback_at)
    halt("require callback_at time in order to mark as calback") unless self.callback_at
  end

  def expire(user, params = {})
    @object.quality = :expired
  end


  def load_workflow_state
    @object.workflow_state
  end

  def persist_workflow_state(new_value)
    return if halted?
    @object.workflow_state = new_value
    @object.save!
  end



  def method_missing(name, *args)
    @object.send(name, *args)
  end

end