module Chargify
  class Subscription < Base
    include ResponseHelper

    def self.find_by_customer_reference(reference)
      customer = Customer.find_by_reference(reference)
      find(:first, :params => {:customer_id => customer.id})
    end

    # Strip off nested attributes of associations before saving, or type-mismatch errors will occur
    def save
      self.attributes.stringify_keys!
      self.attributes.delete('customer')
      self.attributes.delete('product')
      self.attributes.delete('credit_card')
      self.attributes.delete('bank_account')
      self.attributes.delete('paypal_account')

      self.attributes, options = extract_uniqueness_token(attributes)
      self.prefix_options.merge!(options)
      super
    end

    def cancel(params = {})
      if params.blank?
        destroy
      else
        #Destroy does not support body, must work around it to send verb DELETE
        self.connection.post(
          element_path,
          {
            cancellation_message: params[:cancellation_message] || nil,
            reason_code: params[:reason_code] || nil
          }.to_xml(:root => :subscription),
          self.class.headers.merge({'X-Http-Method-Override' => 'DELETE'})
        )
      end
    end

    def build_metadata(params = {})
      SubscriptionMetadata.new(params.reverse_merge({:resource_id => self.id}))
    end

    def create_metadata(params = {})
      SubscriptionMetadata.create(params.reverse_merge({:resource_id => self.id}))
    end

    def metadata(params={})
      params.merge!({:resource_id => self.id})
      SubscriptionMetadata.find(:all, :params => params)
    end

    def component(id)
      Component.find(id, :params => {:subscription_id => self.id})
    end

    def components(params = {})
      params.merge!({:subscription_id => self.id})
      Component.find(:all, :params => params)
    end

    def events(params = {})
      params.merge!(:subscription_id => self.id)
      Event.all(:params => params)
    end

    def payment_profile
      if self.respond_to?('credit_card')
        credit_card
      elsif self.respond_to?('bank_account')
        bank_account
      elsif self.respond_to?('paypal_account')
        paypal_account
      end
    end

    # Perform a one-time charge on an existing subscription.
    # For more information, please see the one-time charge API docs available
    # at: http://support.chargify.com/faqs/api/api-charges
    def charge(attrs = {})
      Chargify::Charge.create(attrs.merge(:subscription_id => self.id))
    end

    # Record an external payment on an existing subscription.
    # This DOES NOT charge the customer's credit card.
    # For more information, please see the API docs available
    # at: https://docs.chargify.com/api-payments
    def payment(attrs = {})
      Chargify::Payment.create(attrs.merge(:subscription_id => self.id))
    end

    def credit(attrs = {})
      attrs, options = extract_uniqueness_token(attrs)
      process_capturing_errors do
        post :credits, options, attrs.to_xml(:root => :credit)
      end
    end

    def refund(attrs = {})
      attrs, options = extract_uniqueness_token(attrs)
      process_capturing_errors do
        post :refunds, options, attrs.to_xml(:root => :refund)
      end
    end

    def reactivate(params = {})
      process_capturing_errors do
        put :reactivate, params
      end
    end

    def retry
      process_capturing_errors do
        put :retry
      end
    end

    def reset_balance
      process_capturing_errors do
        put :reset_balance
      end
    end

    def migrate(attrs = {})
      Chargify::Migration.create(attrs.merge(:subscription_id => self.id))
    end

    def statement(id)
      statement = Chargify::Statement.find(id)
      raise ActiveResource::ResourceNotFound.new(nil) if (statement.subscription_id != self.id)
      statement
    end

    def statements(params = {})
      params.merge!(:subscription_id => self.id)
      Statement.find(:all, :params => params)
    end

    def invoices(params = {})
      params.merge!(subscription_id: self.id)
      Invoice.find(:all, params: params)
    end

    def invoice(id)
      invoice = Chargify::Invoice.find(id)
      raise ActiveResource::ResourceNotFound.new(nil) if (invoice.subscription_id != self.id)
      invoice
    end

    def transactions(params = {})
      params.merge!(:subscription_id => self.id)
      Transaction.find(:all, :params => params)
    end

    def adjustment(attrs = {})
      attrs, options = extract_uniqueness_token(attrs)
      process_capturing_errors do
        post :adjustments, options, attrs.to_xml(:root => :adjustment)
      end
    end

    def add_coupon(code)
      process_capturing_errors do
        post :add_coupon, :code => code
      end
    end

    def remove_coupon(code=nil)
      process_capturing_errors do
        if code.nil?
          delete :remove_coupon
        else
          delete :remove_coupon, :code => code
        end
      end
    end

    def delayed_cancel(cancel_at_end_of_period = true)
      self.cancel_at_end_of_period = cancel_at_end_of_period
      save
    end

    def product_change(handle, delayed = false)
      self.product_handle = handle
      self.product_change_delayed = delayed
      save
    end

    def cancel_delayed_product_change
      self.next_product_id = nil
      save
    end

    private

    class Component < Base
      self.prefix = "/subscriptions/:subscription_id/"

      # All Subscription Components are considered already existing records, but the id isn't used
      def id
        self.component_id
      end
    end

    class Event < Base
      self.prefix = '/subscriptions/:subscription_id/'
    end

    class Statement < Base
      self.prefix = "/subscriptions/:subscription_id/"
    end

    class Transaction < Base
      self.prefix = "/subscriptions/:subscription_id/"

      def full_refund(attrs = {})
        return false if self.transaction_type != 'payment'

        attrs.merge!(:amount_in_cents => self.amount_in_cents)
        self.refund(attrs)
      end

      def refund(attrs = {})
        return false if self.transaction_type != 'payment'

        attrs.merge!(:payment_id => self.id)
        Subscription.find(self.prefix_options[:subscription_id]).refund(attrs)
      end

      class Taxation < Base
        class TaxRule < Base
        end
      end
    end
  end
end